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primera implementacio de postfx

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This commit is contained in:
Sergio
2026-03-23 13:18:36 +01:00
parent 99cc803f21
commit 2f3161d701
23 changed files with 13306 additions and 771 deletions
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522
source/rendering/opengl/opengl_shader.cpp
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#include "opengl_shader.hpp"
#include <SDL3/SDL.h>
#include <array>
#include <cstring>
#include <stdexcept>
#include <vector>
#include "ui/logger.hpp" // Para Loger
namespace Rendering {
OpenGLShader::~OpenGLShader() {
cleanup();
}
#ifndef __APPLE__
auto OpenGLShader::initGLExtensions() -> bool {
glCreateShader = (PFNGLCREATESHADERPROC)SDL_GL_GetProcAddress("glCreateShader");
glShaderSource = (PFNGLSHADERSOURCEPROC)SDL_GL_GetProcAddress("glShaderSource");
glCompileShader = (PFNGLCOMPILESHADERPROC)SDL_GL_GetProcAddress("glCompileShader");
glGetShaderiv = (PFNGLGETSHADERIVPROC)SDL_GL_GetProcAddress("glGetShaderiv");
glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC)SDL_GL_GetProcAddress("glGetShaderInfoLog");
glDeleteShader = (PFNGLDELETESHADERPROC)SDL_GL_GetProcAddress("glDeleteShader");
glAttachShader = (PFNGLATTACHSHADERPROC)SDL_GL_GetProcAddress("glAttachShader");
glCreateProgram = (PFNGLCREATEPROGRAMPROC)SDL_GL_GetProcAddress("glCreateProgram");
glLinkProgram = (PFNGLLINKPROGRAMPROC)SDL_GL_GetProcAddress("glLinkProgram");
glValidateProgram = (PFNGLVALIDATEPROGRAMPROC)SDL_GL_GetProcAddress("glValidateProgram");
glGetProgramiv = (PFNGLGETPROGRAMIVPROC)SDL_GL_GetProcAddress("glGetProgramiv");
glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC)SDL_GL_GetProcAddress("glGetProgramInfoLog");
glUseProgram = (PFNGLUSEPROGRAMPROC)SDL_GL_GetProcAddress("glUseProgram");
glDeleteProgram = (PFNGLDELETEPROGRAMPROC)SDL_GL_GetProcAddress("glDeleteProgram");
glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)SDL_GL_GetProcAddress("glGetUniformLocation");
glUniform2f = (PFNGLUNIFORM2FPROC)SDL_GL_GetProcAddress("glUniform2f");
glGenVertexArrays = (PFNGLGENVERTEXARRAYSPROC)SDL_GL_GetProcAddress("glGenVertexArrays");
glBindVertexArray = (PFNGLBINDVERTEXARRAYPROC)SDL_GL_GetProcAddress("glBindVertexArray");
glDeleteVertexArrays = (PFNGLDELETEVERTEXARRAYSPROC)SDL_GL_GetProcAddress("glDeleteVertexArrays");
glGenBuffers = (PFNGLGENBUFFERSPROC)SDL_GL_GetProcAddress("glGenBuffers");
glBindBuffer = (PFNGLBINDBUFFERPROC)SDL_GL_GetProcAddress("glBindBuffer");
glBufferData = (PFNGLBUFFERDATAPROC)SDL_GL_GetProcAddress("glBufferData");
glDeleteBuffers = (PFNGLDELETEBUFFERSPROC)SDL_GL_GetProcAddress("glDeleteBuffers");
glVertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERPROC)SDL_GL_GetProcAddress("glVertexAttribPointer");
glEnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)SDL_GL_GetProcAddress("glEnableVertexAttribArray");
return (glCreateShader != nullptr) && (glShaderSource != nullptr) && (glCompileShader != nullptr) && (glGetShaderiv != nullptr) &&
(glGetShaderInfoLog != nullptr) && (glDeleteShader != nullptr) && (glAttachShader != nullptr) && (glCreateProgram != nullptr) &&
(glLinkProgram != nullptr) && (glValidateProgram != nullptr) && (glGetProgramiv != nullptr) && (glGetProgramInfoLog != nullptr) &&
(glUseProgram != nullptr) && (glDeleteProgram != nullptr) && (glGetUniformLocation != nullptr) && (glUniform2f != nullptr) &&
(glGenVertexArrays != nullptr) && (glBindVertexArray != nullptr) && (glDeleteVertexArrays != nullptr) &&
(glGenBuffers != nullptr) && (glBindBuffer != nullptr) && (glBufferData != nullptr) && (glDeleteBuffers != nullptr) &&
(glVertexAttribPointer != nullptr) && (glEnableVertexAttribArray != nullptr);
}
#endif
void OpenGLShader::checkGLError(const char* operation) {
GLenum error = glGetError();
if (error != GL_NO_ERROR) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error OpenGL en %s: 0x%x",
operation,
error);
}
}
auto OpenGLShader::compileShader(const std::string& source, GLenum shader_type) -> GLuint {
if (source.empty()) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"ERROR: El código fuente del shader está vacío");
return 0;
}
GLuint shader_id = glCreateShader(shader_type);
if (shader_id == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Error al crear shader");
checkGLError("glCreateShader");
return 0;
}
std::array<const char*, 1> sources = {source.c_str()};
glShaderSource(shader_id, 1, sources.data(), nullptr);
checkGLError("glShaderSource");
glCompileShader(shader_id);
checkGLError("glCompileShader");
// Verificar compilación
GLint compiled = GL_FALSE;
glGetShaderiv(shader_id, GL_COMPILE_STATUS, &compiled);
if (compiled != GL_TRUE) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error en compilación del shader");
GLint log_length;
glGetShaderiv(shader_id, GL_INFO_LOG_LENGTH, &log_length);
if (log_length > 0) {
std::vector<char> log(log_length);
glGetShaderInfoLog(shader_id, log_length, &log_length, log.data());
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Log de compilación: %s",
log.data());
}
glDeleteShader(shader_id);
return 0;
}
return shader_id;
}
auto OpenGLShader::linkProgram(GLuint vertex_shader, GLuint fragment_shader) -> GLuint {
GLuint program = glCreateProgram();
if (program == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error al crear programa de shaders");
return 0;
}
glAttachShader(program, vertex_shader);
checkGLError("glAttachShader(vertex)");
glAttachShader(program, fragment_shader);
checkGLError("glAttachShader(fragment)");
glLinkProgram(program);
checkGLError("glLinkProgram");
// Verificar enlace
GLint linked = GL_FALSE;
glGetProgramiv(program, GL_LINK_STATUS, &linked);
if (linked != GL_TRUE) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error al enlazar programa");
GLint log_length;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_length);
if (log_length > 0) {
std::vector<char> log(log_length);
glGetProgramInfoLog(program, log_length, &log_length, log.data());
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Log de enlace: %s",
log.data());
}
glDeleteProgram(program);
return 0;
}
glValidateProgram(program);
checkGLError("glValidateProgram");
return program;
}
void OpenGLShader::createQuadGeometry() {
// Datos del quad: posición (x, y) + coordenadas de textura (u, v)
// Formato: x, y, u, v
std::array<float, 16> vertices = {
// Posición // TexCoords
-1.0F,
-1.0F,
0.0F,
0.0F, // Inferior izquierda
1.0F,
-1.0F,
1.0F,
0.0F, // Inferior derecha
1.0F,
1.0F,
1.0F,
1.0F, // Superior derecha
-1.0F,
1.0F,
0.0F,
1.0F // Superior izquierda
};
// Índices para dibujar el quad con dos triángulos
std::array<unsigned int, 6> indices = {
0,
1,
2, // Primer triángulo
2,
3,
0 // Segundo triángulo
};
// Generar y configurar VAO
glGenVertexArrays(1, &vao_);
glBindVertexArray(vao_);
checkGLError("glBindVertexArray");
// Generar y configurar VBO
glGenBuffers(1, &vbo_);
glBindBuffer(GL_ARRAY_BUFFER, vbo_);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices.data(), GL_STATIC_DRAW);
checkGLError("glBufferData(VBO)");
// Generar y configurar EBO
glGenBuffers(1, &ebo_);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo_);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices.data(), GL_STATIC_DRAW);
checkGLError("glBufferData(EBO)");
// Atributo 0: Posición (2 floats)
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), nullptr);
glEnableVertexAttribArray(0);
checkGLError("glVertexAttribPointer(position)");
// Atributo 1: Coordenadas de textura (2 floats)
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), static_cast<const void*>(static_cast<const char*>(nullptr) + (2 * sizeof(float))));
glEnableVertexAttribArray(1);
checkGLError("glVertexAttribPointer(texcoord)");
// Desvincular
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
auto OpenGLShader::getTextureID(SDL_Texture* texture) -> GLuint {
if (texture == nullptr) {
return 1;
}
SDL_PropertiesID props = SDL_GetTextureProperties(texture);
GLuint texture_id = 0;
// Intentar obtener ID de textura OpenGL
texture_id = static_cast<GLuint>(reinterpret_cast<uintptr_t>(SDL_GetPointerProperty(props, "SDL.texture.opengl.texture", nullptr)));
if (texture_id == 0) {
texture_id = static_cast<GLuint>(reinterpret_cast<uintptr_t>(SDL_GetPointerProperty(props, "texture.opengl.texture", nullptr)));
}
if (texture_id == 0) {
texture_id = static_cast<GLuint>(SDL_GetNumberProperty(props, "SDL.texture.opengl.texture", 1));
}
if (texture_id == 0) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"No se pudo obtener ID de textura OpenGL, usando 1 por defecto");
texture_id = 1;
}
return texture_id;
}
auto OpenGLShader::init(SDL_Window* window,
SDL_Texture* texture,
const std::string& vertex_source,
const std::string& fragment_source) -> bool {
window_ = window;
back_buffer_ = texture;
renderer_ = SDL_GetRenderer(window);
if (renderer_ == nullptr) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error: No se pudo obtener el renderer");
return false;
}
// Obtener tamaños
SDL_GetWindowSize(window_, &window_width_, &window_height_);
SDL_GetTextureSize(back_buffer_, &texture_width_, &texture_height_);
/*
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Inicializando shaders: ventana=%dx%d, textura=%.0fx%.0f",
window_width_,
window_height_,
texture_width_,
texture_height_);
*/
Logger::info(
"Inicializando shaders: ventana=" +
std::to_string(window_width_) +
"x" +
std::to_string(window_height_) +
", textura=" +
std::to_string(static_cast<int>(texture_width_)) +
"x" +
std::to_string(static_cast<int>(texture_height_)));
// Verificar que es OpenGL
const char* renderer_name = SDL_GetRendererName(renderer_);
if ((renderer_name == nullptr) || strncmp(renderer_name, "opengl", 6) != 0) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"Renderer no es OpenGL: %s",
(renderer_name != nullptr) ? renderer_name : "unknown");
return false;
}
#ifndef __APPLE__
// Inicializar extensiones OpenGL en Windows/Linux
if (!initGLExtensions()) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error al inicializar extensiones OpenGL");
return false;
}
#endif
// Limpiar shader anterior si existe
if (program_id_ != 0) {
glDeleteProgram(program_id_);
program_id_ = 0;
}
// Compilar shaders
GLuint vertex_shader = compileShader(vertex_source, GL_VERTEX_SHADER);
GLuint fragment_shader = compileShader(fragment_source, GL_FRAGMENT_SHADER);
if (vertex_shader == 0 || fragment_shader == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error al compilar shaders");
if (vertex_shader != 0) {
glDeleteShader(vertex_shader);
}
if (fragment_shader != 0) {
glDeleteShader(fragment_shader);
}
return false;
}
// Enlazar programa
program_id_ = linkProgram(vertex_shader, fragment_shader);
// Limpiar shaders (ya no necesarios tras el enlace)
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
if (program_id_ == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Error al crear programa de shaders");
return false;
}
// Crear geometría del quad
createQuadGeometry();
// Obtener ubicación del uniform TextureSize
glUseProgram(program_id_);
texture_size_location_ = glGetUniformLocation(program_id_, "TextureSize");
if (texture_size_location_ != -1) {
/*
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Configurando TextureSize uniform: %.0fx%.0f",
texture_width_,
texture_height_);
*/
Logger::info(
"Configurando TextureSize uniform: " +
std::to_string(static_cast<int>(texture_width_)) +
"x" +
std::to_string(static_cast<int>(texture_height_)));
glUniform2f(texture_size_location_, texture_width_, texture_height_);
checkGLError("glUniform2f(TextureSize)");
} else {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"Uniform 'TextureSize' no encontrado en shader");
}
glUseProgram(0);
is_initialized_ = true;
/*
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"** OpenGL 3.3 Shader Backend inicializado correctamente");
*/
Logger::info("OpenGL 3.3 Shader Backend inicializado correctamente");
return true;
}
void OpenGLShader::render() {
if (!is_initialized_ || program_id_ == 0) {
// Fallback: renderizado SDL normal
SDL_SetRenderDrawColor(renderer_, 0, 0, 0, 255);
SDL_SetRenderTarget(renderer_, nullptr);
SDL_RenderClear(renderer_);
SDL_RenderTexture(renderer_, back_buffer_, nullptr, nullptr);
SDL_RenderPresent(renderer_);
return;
}
// Obtener tamaño actual de ventana (puede haber cambiado)
int current_width;
int current_height;
SDL_GetWindowSize(window_, &current_width, &current_height);
// Guardar estados OpenGL
GLint old_program;
glGetIntegerv(GL_CURRENT_PROGRAM, &old_program);
std::array<GLint, 4> old_viewport{};
glGetIntegerv(GL_VIEWPORT, old_viewport.data());
GLboolean was_texture_enabled = glIsEnabled(GL_TEXTURE_2D);
GLint old_texture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &old_texture);
GLint old_vao;
glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &old_vao);
// Preparar renderizado
SDL_SetRenderDrawColor(renderer_, 0, 0, 0, 255);
SDL_SetRenderTarget(renderer_, nullptr);
SDL_RenderClear(renderer_);
// Obtener y bindear textura
GLuint texture_id = getTextureID(back_buffer_);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture_id);
checkGLError("glBindTexture");
// Usar nuestro programa
glUseProgram(program_id_);
checkGLError("glUseProgram");
// Configurar viewport (obtener tamaño lógico de SDL)
int logical_w;
int logical_h;
SDL_RendererLogicalPresentation mode;
SDL_GetRenderLogicalPresentation(renderer_, &logical_w, &logical_h, &mode);
if (logical_w == 0 || logical_h == 0) {
logical_w = current_width;
logical_h = current_height;
}
// Calcular viewport considerando aspect ratio
int viewport_x = 0;
int viewport_y = 0;
int viewport_w = current_width;
int viewport_h = current_height;
if (mode == SDL_LOGICAL_PRESENTATION_INTEGER_SCALE) {
int scale_x = current_width / logical_w;
int scale_y = current_height / logical_h;
int scale = (scale_x < scale_y) ? scale_x : scale_y;
scale = std::max(scale, 1);
viewport_w = logical_w * scale;
viewport_h = logical_h * scale;
viewport_x = (current_width - viewport_w) / 2;
viewport_y = (current_height - viewport_h) / 2;
} else {
float window_aspect = static_cast<float>(current_width) / current_height;
float logical_aspect = static_cast<float>(logical_w) / logical_h;
if (window_aspect > logical_aspect) {
viewport_w = static_cast<int>(logical_aspect * current_height);
viewport_x = (current_width - viewport_w) / 2;
} else {
viewport_h = static_cast<int>(current_width / logical_aspect);
viewport_y = (current_height - viewport_h) / 2;
}
}
glViewport(viewport_x, viewport_y, viewport_w, viewport_h);
checkGLError("glViewport");
// Dibujar quad usando VAO
glBindVertexArray(vao_);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);
checkGLError("glDrawElements");
// Presentar
SDL_GL_SwapWindow(window_);
// Restaurar estados OpenGL
glUseProgram(old_program);
glBindTexture(GL_TEXTURE_2D, old_texture);
if (was_texture_enabled == 0U) {
glDisable(GL_TEXTURE_2D);
}
glBindVertexArray(old_vao);
glViewport(old_viewport[0], old_viewport[1], old_viewport[2], old_viewport[3]);
}
void OpenGLShader::setTextureSize(float width, float height) {
if (!is_initialized_ || program_id_ == 0) {
return;
}
texture_width_ = width;
texture_height_ = height;
GLint old_program;
glGetIntegerv(GL_CURRENT_PROGRAM, &old_program);
glUseProgram(program_id_);
if (texture_size_location_ != -1) {
glUniform2f(texture_size_location_, width, height);
checkGLError("glUniform2f(TextureSize)");
}
glUseProgram(old_program);
}
void OpenGLShader::cleanup() {
if (vao_ != 0) {
glDeleteVertexArrays(1, &vao_);
vao_ = 0;
}
if (vbo_ != 0) {
glDeleteBuffers(1, &vbo_);
vbo_ = 0;
}
if (ebo_ != 0) {
glDeleteBuffers(1, &ebo_);
ebo_ = 0;
}
if (program_id_ != 0) {
glDeleteProgram(program_id_);
program_id_ = 0;
}
is_initialized_ = false;
window_ = nullptr;
renderer_ = nullptr;
back_buffer_ = nullptr;
}
} // namespace Rendering

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source/rendering/opengl/opengl_shader.hpp
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#pragma once
#include "../shader_backend.hpp"
#ifdef __APPLE__
#include <OpenGL/gl3.h>
#else
#include <SDL3/SDL_opengl.h>
#endif
namespace Rendering {
/**
* @brief Backend de shaders usando OpenGL 3.3 Core Profile
*
* Implementa el renderizado de shaders usando APIs modernas de OpenGL:
* - VAO (Vertex Array Objects)
* - VBO (Vertex Buffer Objects)
* - Shaders GLSL #version 330 core
*/
class OpenGLShader : public ShaderBackend {
public:
OpenGLShader() = default;
~OpenGLShader() override;
auto init(SDL_Window* window,
SDL_Texture* texture,
const std::string& vertex_source,
const std::string& fragment_source) -> bool override;
void render() override;
void setTextureSize(float width, float height) override;
void cleanup() final;
[[nodiscard]] auto isHardwareAccelerated() const -> bool override { return is_initialized_; }
private:
// Funciones auxiliares
auto initGLExtensions() -> bool;
static auto compileShader(const std::string& source, GLenum shader_type) -> GLuint;
static auto linkProgram(GLuint vertex_shader, GLuint fragment_shader) -> GLuint;
void createQuadGeometry();
static auto getTextureID(SDL_Texture* texture) -> GLuint;
static void checkGLError(const char* operation);
// Estado SDL
SDL_Window* window_ = nullptr;
SDL_Renderer* renderer_ = nullptr;
SDL_Texture* back_buffer_ = nullptr;
// Estado OpenGL
GLuint program_id_ = 0;
GLuint vao_ = 0; // Vertex Array Object
GLuint vbo_ = 0; // Vertex Buffer Object
GLuint ebo_ = 0; // Element Buffer Object
// Ubicaciones de uniforms
GLint texture_size_location_ = -1;
// Tamaños
int window_width_ = 0;
int window_height_ = 0;
float texture_width_ = 0.0F;
float texture_height_ = 0.0F;
// Estado
bool is_initialized_ = false;
#ifndef __APPLE__
// Punteros a funciones OpenGL en Windows/Linux
PFNGLCREATESHADERPROC glCreateShader = nullptr;
PFNGLSHADERSOURCEPROC glShaderSource = nullptr;
PFNGLCOMPILESHADERPROC glCompileShader = nullptr;
PFNGLGETSHADERIVPROC glGetShaderiv = nullptr;
PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog = nullptr;
PFNGLDELETESHADERPROC glDeleteShader = nullptr;
PFNGLATTACHSHADERPROC glAttachShader = nullptr;
PFNGLCREATEPROGRAMPROC glCreateProgram = nullptr;
PFNGLLINKPROGRAMPROC glLinkProgram = nullptr;
PFNGLVALIDATEPROGRAMPROC glValidateProgram = nullptr;
PFNGLGETPROGRAMIVPROC glGetProgramiv = nullptr;
PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog = nullptr;
PFNGLUSEPROGRAMPROC glUseProgram = nullptr;
PFNGLDELETEPROGRAMPROC glDeleteProgram = nullptr;
PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation = nullptr;
PFNGLUNIFORM2FPROC glUniform2f = nullptr;
PFNGLGENVERTEXARRAYSPROC glGenVertexArrays = nullptr;
PFNGLBINDVERTEXARRAYPROC glBindVertexArray = nullptr;
PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays = nullptr;
PFNGLGENBUFFERSPROC glGenBuffers = nullptr;
PFNGLBINDBUFFERPROC glBindBuffer = nullptr;
PFNGLBUFFERDATAPROC glBufferData = nullptr;
PFNGLDELETEBUFFERSPROC glDeleteBuffers = nullptr;
PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer = nullptr;
PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray = nullptr;
#endif
};
} // namespace Rendering

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source/rendering/sdl3gpu/sdl3gpu_shader.cpp Normal file
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#include "rendering/sdl3gpu/sdl3gpu_shader.hpp"
#include <SDL3/SDL_log.h>
#include <algorithm> // std::min, std::max, std::floor
#include <cmath> // std::floor
#include <cstring> // memcpy, strlen
#ifndef __APPLE__
#include "rendering/sdl3gpu/postfx_frag_spv.h"
#include "rendering/sdl3gpu/postfx_vert_spv.h"
#endif
#ifdef __APPLE__
// ============================================================================
// MSL shaders (Metal Shading Language) — macOS
// ============================================================================
// NOLINTBEGIN(readability-identifier-naming)
static const char* POSTFX_VERT_MSL = R"(
#include <metal_stdlib>
using namespace metal;
struct PostVOut {
float4 pos [[position]];
float2 uv;
};
vertex PostVOut postfx_vs(uint vid [[vertex_id]]) {
const float2 positions[3] = { {-1.0, -1.0}, {3.0, -1.0}, {-1.0, 3.0} };
const float2 uvs[3] = { { 0.0, 1.0}, {2.0, 1.0}, { 0.0,-1.0} };
PostVOut out;
out.pos = float4(positions[vid], 0.0, 1.0);
out.uv = uvs[vid];
return out;
}
)";
static const char* POSTFX_FRAG_MSL = R"(
#include <metal_stdlib>
using namespace metal;
struct PostVOut {
float4 pos [[position]];
float2 uv;
};
struct PostFXUniforms {
float vignette_strength;
float chroma_strength;
float scanline_strength;
float screen_height;
float mask_strength;
float gamma_strength;
float curvature;
float bleeding;
float pixel_scale;
float time;
float oversample; // 1.0 = sin SS, 3.0 = 3× supersampling
float flicker; // 0 = off, 1 = phosphor flicker ~50 Hz
};
// YCbCr helpers for NTSC bleeding
static float3 rgb_to_ycc(float3 rgb) {
return float3(
0.299f*rgb.r + 0.587f*rgb.g + 0.114f*rgb.b,
-0.169f*rgb.r - 0.331f*rgb.g + 0.500f*rgb.b + 0.5f,
0.500f*rgb.r - 0.419f*rgb.g - 0.081f*rgb.b + 0.5f
);
}
static float3 ycc_to_rgb(float3 ycc) {
float y = ycc.x;
float cb = ycc.y - 0.5f;
float cr = ycc.z - 0.5f;
return clamp(float3(
y + 1.402f*cr,
y - 0.344f*cb - 0.714f*cr,
y + 1.772f*cb
), 0.0f, 1.0f);
}
fragment float4 postfx_fs(PostVOut in [[stage_in]],
texture2d<float> scene [[texture(0)]],
sampler samp [[sampler(0)]],
constant PostFXUniforms& u [[buffer(0)]]) {
float2 uv = in.uv;
// Curvatura barrel CRT
if (u.curvature > 0.0f) {
float2 c = uv - 0.5f;
float rsq = dot(c, c);
float2 dist = float2(0.05f, 0.1f) * u.curvature;
float2 barrelScale = 1.0f - 0.23f * dist;
c += c * (dist * rsq);
c *= barrelScale;
if (abs(c.x) >= 0.5f || abs(c.y) >= 0.5f) {
return float4(0.0f, 0.0f, 0.0f, 1.0f);
}
uv = c + 0.5f;
}
// Muestra base
float3 base = scene.sample(samp, uv).rgb;
// Sangrado NTSC — difuminado horizontal de crominancia.
// step = 1 pixel de juego en espacio UV (corrige SS: scene.get_width() = game_w * oversample).
float3 colour;
if (u.bleeding > 0.0f) {
float tw = float(scene.get_width());
float step = u.oversample / tw; // 1 pixel lógico en UV
float3 ycc = rgb_to_ycc(base);
float3 ycc_l2 = rgb_to_ycc(scene.sample(samp, uv - float2(2.0f*step, 0.0f)).rgb);
float3 ycc_l1 = rgb_to_ycc(scene.sample(samp, uv - float2(1.0f*step, 0.0f)).rgb);
float3 ycc_r1 = rgb_to_ycc(scene.sample(samp, uv + float2(1.0f*step, 0.0f)).rgb);
float3 ycc_r2 = rgb_to_ycc(scene.sample(samp, uv + float2(2.0f*step, 0.0f)).rgb);
ycc.yz = (ycc_l2.yz + ycc_l1.yz*2.0f + ycc.yz*2.0f + ycc_r1.yz*2.0f + ycc_r2.yz) / 8.0f;
colour = mix(base, ycc_to_rgb(ycc), u.bleeding);
} else {
colour = base;
}
// Aberración cromática (drift animado con time para efecto NTSC real)
float ca = u.chroma_strength * 0.005f * (1.0f + 0.15f * sin(u.time * 7.3f));
colour.r = scene.sample(samp, uv + float2(ca, 0.0f)).r;
colour.b = scene.sample(samp, uv - float2(ca, 0.0f)).b;
// Corrección gamma (linealizar antes de scanlines, codificar después)
if (u.gamma_strength > 0.0f) {
float3 lin = pow(colour, float3(2.4f));
colour = mix(colour, lin, u.gamma_strength);
}
// Scanlines — 1 pixel físico oscuro por fila lógica.
// Usa uv.y (independiente del offset de letterbox) con pixel_scale para
// calcular la posición dentro de la fila en coordenadas físicas.
// 3x: 1 dark + 2 bright. 4x: 1 dark + 3 bright.
// bright=3.5×, dark floor=0.42 (mantiene aspecto CRT original).
if (u.scanline_strength > 0.0f) {
float ps = max(1.0f, round(u.pixel_scale));
float frac_in_row = fract(uv.y * u.screen_height);
float row_pos = floor(frac_in_row * ps);
float is_dark = step(ps - 1.0f, row_pos);
float scan = mix(3.5f, 0.42f, is_dark);
colour *= mix(1.0f, scan, u.scanline_strength);
}
if (u.gamma_strength > 0.0f) {
float3 enc = pow(colour, float3(1.0f/2.2f));
colour = mix(colour, enc, u.gamma_strength);
}
// Viñeta
float2 d = uv - 0.5f;
float vignette = 1.0f - dot(d, d) * u.vignette_strength;
colour *= clamp(vignette, 0.0f, 1.0f);
// Máscara de fósforo RGB — después de scanlines (orden original):
// filas brillantes saturadas → máscara invisible, filas oscuras → RGB visible.
if (u.mask_strength > 0.0f) {
float whichMask = fract(in.pos.x * 0.3333333f);
float3 mask = float3(0.80f);
if (whichMask < 0.3333333f) mask.x = 1.0f;
else if (whichMask < 0.6666667f) mask.y = 1.0f;
else mask.z = 1.0f;
colour = mix(colour, colour * mask, u.mask_strength);
}
// Parpadeo de fósforo CRT (~50 Hz)
if (u.flicker > 0.0f) {
float flicker_wave = sin(u.time * 100.0f) * 0.5f + 0.5f;
colour *= 1.0f - u.flicker * 0.04f * flicker_wave;
}
return float4(colour, 1.0f);
}
)";
// NOLINTEND(readability-identifier-naming)
#endif // __APPLE__
namespace Rendering {
// ---------------------------------------------------------------------------
// Destructor
// ---------------------------------------------------------------------------
SDL3GPUShader::~SDL3GPUShader() {
destroy();
}
// ---------------------------------------------------------------------------
// init
// ---------------------------------------------------------------------------
auto SDL3GPUShader::init(SDL_Window* window,
SDL_Texture* texture,
const std::string& /*vertex_source*/,
const std::string& /*fragment_source*/) -> bool {
// Si ya estaba inicializado (p.ej. al cambiar borde), liberar recursos
// de textura/pipeline pero mantener el device vivo para evitar conflictos
// con SDL_Renderer en Windows/Vulkan.
if (is_initialized_) {
cleanup();
}
window_ = window;
// Dimensions from the SDL_Texture placeholder
float fw = 0.0F;
float fh = 0.0F;
SDL_GetTextureSize(texture, &fw, &fh);
game_width_ = static_cast<int>(fw);
game_height_ = static_cast<int>(fh);
tex_width_ = game_width_ * oversample_;
tex_height_ = game_height_ * oversample_;
uniforms_.screen_height = static_cast<float>(tex_height_); // Altura de la textura GPU
uniforms_.oversample = static_cast<float>(oversample_);
// ----------------------------------------------------------------
// 1. Create GPU device (solo si no existe ya)
// ----------------------------------------------------------------
if (device_ == nullptr) {
#ifdef __APPLE__
const SDL_GPUShaderFormat PREFERRED = SDL_GPU_SHADERFORMAT_MSL | SDL_GPU_SHADERFORMAT_METALLIB;
#else
const SDL_GPUShaderFormat PREFERRED = SDL_GPU_SHADERFORMAT_SPIRV;
#endif
device_ = SDL_CreateGPUDevice(PREFERRED, false, nullptr);
if (device_ == nullptr) {
SDL_Log("SDL3GPUShader: SDL_CreateGPUDevice failed: %s", SDL_GetError());
return false;
}
SDL_Log("SDL3GPUShader: driver = %s", SDL_GetGPUDeviceDriver(device_));
// ----------------------------------------------------------------
// 2. Claim window (una sola vez — no liberar hasta destroy())
// ----------------------------------------------------------------
if (!SDL_ClaimWindowForGPUDevice(device_, window_)) {
SDL_Log("SDL3GPUShader: SDL_ClaimWindowForGPUDevice failed: %s", SDL_GetError());
SDL_DestroyGPUDevice(device_);
device_ = nullptr;
return false;
}
SDL_SetGPUSwapchainParameters(device_, window_, SDL_GPU_SWAPCHAINCOMPOSITION_SDR, vsync_ ? SDL_GPU_PRESENTMODE_VSYNC : SDL_GPU_PRESENTMODE_IMMEDIATE);
}
// ----------------------------------------------------------------
// 3. Create scene texture (upload target + sampler source)
// Format: B8G8R8A8_UNORM matches SDL ARGB8888 byte layout on LE
// ----------------------------------------------------------------
SDL_GPUTextureCreateInfo tex_info = {};
tex_info.type = SDL_GPU_TEXTURETYPE_2D;
tex_info.format = SDL_GPU_TEXTUREFORMAT_B8G8R8A8_UNORM;
tex_info.usage = SDL_GPU_TEXTUREUSAGE_SAMPLER;
tex_info.width = static_cast<Uint32>(tex_width_);
tex_info.height = static_cast<Uint32>(tex_height_);
tex_info.layer_count_or_depth = 1;
tex_info.num_levels = 1;
scene_texture_ = SDL_CreateGPUTexture(device_, &tex_info);
if (scene_texture_ == nullptr) {
SDL_Log("SDL3GPUShader: failed to create scene texture: %s", SDL_GetError());
cleanup();
return false;
}
// ----------------------------------------------------------------
// 4. Create upload transfer buffer (CPU → GPU, size = w*h*4 bytes)
// ----------------------------------------------------------------
SDL_GPUTransferBufferCreateInfo tb_info = {};
tb_info.usage = SDL_GPU_TRANSFERBUFFERUSAGE_UPLOAD;
tb_info.size = static_cast<Uint32>(tex_width_ * tex_height_ * 4);
upload_buffer_ = SDL_CreateGPUTransferBuffer(device_, &tb_info);
if (upload_buffer_ == nullptr) {
SDL_Log("SDL3GPUShader: failed to create upload buffer: %s", SDL_GetError());
cleanup();
return false;
}
// ----------------------------------------------------------------
// 5. Create samplers: NEAREST (pixel art) + LINEAR (supersampling)
// ----------------------------------------------------------------
SDL_GPUSamplerCreateInfo samp_info = {};
samp_info.min_filter = SDL_GPU_FILTER_NEAREST;
samp_info.mag_filter = SDL_GPU_FILTER_NEAREST;
samp_info.mipmap_mode = SDL_GPU_SAMPLERMIPMAPMODE_NEAREST;
samp_info.address_mode_u = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
samp_info.address_mode_v = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
samp_info.address_mode_w = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
sampler_ = SDL_CreateGPUSampler(device_, &samp_info);
if (sampler_ == nullptr) {
SDL_Log("SDL3GPUShader: failed to create sampler: %s", SDL_GetError());
cleanup();
return false;
}
SDL_GPUSamplerCreateInfo lsamp_info = {};
lsamp_info.min_filter = SDL_GPU_FILTER_LINEAR;
lsamp_info.mag_filter = SDL_GPU_FILTER_LINEAR;
lsamp_info.mipmap_mode = SDL_GPU_SAMPLERMIPMAPMODE_NEAREST;
lsamp_info.address_mode_u = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
lsamp_info.address_mode_v = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
lsamp_info.address_mode_w = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
linear_sampler_ = SDL_CreateGPUSampler(device_, &lsamp_info);
if (linear_sampler_ == nullptr) {
SDL_Log("SDL3GPUShader: failed to create linear sampler: %s", SDL_GetError());
cleanup();
return false;
}
// ----------------------------------------------------------------
// 6. Create PostFX graphics pipeline
// ----------------------------------------------------------------
if (!createPipeline()) {
cleanup();
return false;
}
is_initialized_ = true;
SDL_Log("SDL3GPUShader: initialized OK (%dx%d)", tex_width_, tex_height_);
return true;
}
// ---------------------------------------------------------------------------
// createPipeline
// ---------------------------------------------------------------------------
auto SDL3GPUShader::createPipeline() -> bool {
const SDL_GPUTextureFormat SWAPCHAIN_FMT = SDL_GetGPUSwapchainTextureFormat(device_, window_);
#ifdef __APPLE__
SDL_GPUShader* vert = createShaderMSL(device_, POSTFX_VERT_MSL, "postfx_vs", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* frag = createShaderMSL(device_, POSTFX_FRAG_MSL, "postfx_fs", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
#else
SDL_GPUShader* vert = createShaderSPIRV(device_, kpostfx_vert_spv, kpostfx_vert_spv_size, "main", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* frag = createShaderSPIRV(device_, kpostfx_frag_spv, kpostfx_frag_spv_size, "main", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
#endif
if ((vert == nullptr) || (frag == nullptr)) {
SDL_Log("SDL3GPUShader: failed to compile PostFX shaders");
if (vert != nullptr) { SDL_ReleaseGPUShader(device_, vert); }
if (frag != nullptr) { SDL_ReleaseGPUShader(device_, frag); }
return false;
}
SDL_GPUColorTargetBlendState no_blend = {};
no_blend.enable_blend = false;
no_blend.enable_color_write_mask = false;
SDL_GPUColorTargetDescription color_target = {};
color_target.format = SWAPCHAIN_FMT;
color_target.blend_state = no_blend;
SDL_GPUVertexInputState no_input = {};
SDL_GPUGraphicsPipelineCreateInfo pipe_info = {};
pipe_info.vertex_shader = vert;
pipe_info.fragment_shader = frag;
pipe_info.vertex_input_state = no_input;
pipe_info.primitive_type = SDL_GPU_PRIMITIVETYPE_TRIANGLELIST;
pipe_info.target_info.num_color_targets = 1;
pipe_info.target_info.color_target_descriptions = &color_target;
pipeline_ = SDL_CreateGPUGraphicsPipeline(device_, &pipe_info);
SDL_ReleaseGPUShader(device_, vert);
SDL_ReleaseGPUShader(device_, frag);
if (pipeline_ == nullptr) {
SDL_Log("SDL3GPUShader: pipeline creation failed: %s", SDL_GetError());
return false;
}
return true;
}
// ---------------------------------------------------------------------------
// uploadPixels — copies ARGB8888 CPU pixels into the GPU transfer buffer.
// Con supersampling (oversample_ > 1) expande cada pixel del juego a un bloque
// oversample × oversample y hornea la scanline oscura en la última fila del bloque.
// ---------------------------------------------------------------------------
void SDL3GPUShader::uploadPixels(const Uint32* pixels, int width, int height) {
if (!is_initialized_ || (upload_buffer_ == nullptr)) { return; }
void* mapped = SDL_MapGPUTransferBuffer(device_, upload_buffer_, false);
if (mapped == nullptr) {
SDL_Log("SDL3GPUShader: SDL_MapGPUTransferBuffer failed: %s", SDL_GetError());
return;
}
if (oversample_ <= 1) {
// Path sin supersampling: copia directa
std::memcpy(mapped, pixels, static_cast<size_t>(width * height * 4));
} else {
// Path con supersampling: expande cada pixel a OS×OS, oscurece última fila.
// Replica la fórmula del shader: mix(3.5, 0.42, scanline_strength).
auto* out = static_cast<Uint32*>(mapped);
const int OS = oversample_;
const float BRIGHT_MUL = 1.0F + (baked_scanline_strength_ * 2.5F); // rows 0..OS-2
const float DARK_MUL = 1.0F - (baked_scanline_strength_ * 0.58F); // row OS-1
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
const Uint32 SRC = pixels[(y * width) + x];
const Uint32 ALPHA = (SRC >> 24) & 0xFFU;
const auto FR = static_cast<float>((SRC >> 16) & 0xFFU);
const auto FG = static_cast<float>((SRC >> 8) & 0xFFU);
const auto FB = static_cast<float>(SRC & 0xFFU);
auto make_px = [ALPHA](float rv, float gv, float bv) -> Uint32 {
auto cl = [](float v) -> Uint32 { return static_cast<Uint32>(std::min(255.0F, v)); };
return (ALPHA << 24) | (cl(rv) << 16) | (cl(gv) << 8) | cl(bv);
};
const Uint32 BRIGHT = make_px(FR * BRIGHT_MUL, FG * BRIGHT_MUL, FB * BRIGHT_MUL);
const Uint32 DARK = make_px(FR * DARK_MUL, FG * DARK_MUL, FB * DARK_MUL);
for (int dy = 0; dy < OS; ++dy) {
const Uint32 OUT_PX = (dy == OS - 1) ? DARK : BRIGHT;
const int DST_Y = (y * OS) + dy;
for (int dx = 0; dx < OS; ++dx) {
out[(DST_Y * (width * OS)) + ((x * OS) + dx)] = OUT_PX;
}
}
}
}
}
SDL_UnmapGPUTransferBuffer(device_, upload_buffer_);
}
// ---------------------------------------------------------------------------
// render — upload scene texture + PostFX pass → swapchain
// ---------------------------------------------------------------------------
void SDL3GPUShader::render() {
if (!is_initialized_) { return; }
SDL_GPUCommandBuffer* cmd = SDL_AcquireGPUCommandBuffer(device_);
if (cmd == nullptr) {
SDL_Log("SDL3GPUShader: SDL_AcquireGPUCommandBuffer failed: %s", SDL_GetError());
return;
}
// ---- Copy pass: transfer buffer → scene texture ----
SDL_GPUCopyPass* copy = SDL_BeginGPUCopyPass(cmd);
if (copy != nullptr) {
SDL_GPUTextureTransferInfo src = {};
src.transfer_buffer = upload_buffer_;
src.offset = 0;
src.pixels_per_row = static_cast<Uint32>(tex_width_);
src.rows_per_layer = static_cast<Uint32>(tex_height_);
SDL_GPUTextureRegion dst = {};
dst.texture = scene_texture_;
dst.w = static_cast<Uint32>(tex_width_);
dst.h = static_cast<Uint32>(tex_height_);
dst.d = 1;
SDL_UploadToGPUTexture(copy, &src, &dst, false);
SDL_EndGPUCopyPass(copy);
}
// ---- Acquire swapchain texture ----
SDL_GPUTexture* swapchain = nullptr;
Uint32 sw = 0;
Uint32 sh = 0;
if (!SDL_AcquireGPUSwapchainTexture(cmd, window_, &swapchain, &sw, &sh)) {
SDL_Log("SDL3GPUShader: SDL_AcquireGPUSwapchainTexture failed: %s", SDL_GetError());
SDL_SubmitGPUCommandBuffer(cmd);
return;
}
if (swapchain == nullptr) {
// Window minimized — skip frame
SDL_SubmitGPUCommandBuffer(cmd);
return;
}
// ---- Render pass: PostFX → swapchain ----
SDL_GPUColorTargetInfo color_target = {};
color_target.texture = swapchain;
color_target.load_op = SDL_GPU_LOADOP_CLEAR;
color_target.store_op = SDL_GPU_STOREOP_STORE;
color_target.clear_color = {.r = 0.0F, .g = 0.0F, .b = 0.0F, .a = 1.0F};
SDL_GPURenderPass* pass = SDL_BeginGPURenderPass(cmd, &color_target, 1, nullptr);
if (pass != nullptr) {
SDL_BindGPUGraphicsPipeline(pass, pipeline_);
// Calcular viewport usando las dimensiones lógicas del canvas (game_width_/height_),
// no las de la textura GPU (que pueden ser game×3 con supersampling).
// El GPU escala la textura para cubrir el viewport independientemente de su resolución.
float vx = 0.0F;
float vy = 0.0F;
float vw = 0.0F;
float vh = 0.0F;
if (integer_scale_) {
const int SCALE = std::max(1, std::min(static_cast<int>(sw) / game_width_, static_cast<int>(sh) / game_height_));
vw = static_cast<float>(game_width_ * SCALE);
vh = static_cast<float>(game_height_ * SCALE);
} else {
const float SCALE = std::min(
static_cast<float>(sw) / static_cast<float>(game_width_),
static_cast<float>(sh) / static_cast<float>(game_height_));
vw = static_cast<float>(game_width_) * SCALE;
vh = static_cast<float>(game_height_) * SCALE;
}
vx = std::floor((static_cast<float>(sw) - vw) * 0.5F);
vy = std::floor((static_cast<float>(sh) - vh) * 0.5F);
SDL_GPUViewport vp = {.x = vx, .y = vy, .w = vw, .h = vh, .min_depth = 0.0F, .max_depth = 1.0F};
SDL_SetGPUViewport(pass, &vp);
// pixel_scale: pixels físicos por pixel lógico de juego (para scanlines sin SS).
// Con SS las scanlines están horneadas en CPU → scanline_strength=0 → no se usa.
uniforms_.pixel_scale = (game_height_ > 0)
? (vh / static_cast<float>(game_height_))
: 1.0F;
uniforms_.time = static_cast<float>(SDL_GetTicks()) / 1000.0F;
uniforms_.oversample = static_cast<float>(oversample_);
// Con supersampling usamos LINEAR para que el escalado a zooms no-múltiplo-de-3
// promedia correctamente las filas de scanline horneadas en CPU.
SDL_GPUSampler* active_sampler = (oversample_ > 1 && linear_sampler_ != nullptr)
? linear_sampler_
: sampler_;
SDL_GPUTextureSamplerBinding binding = {};
binding.texture = scene_texture_;
binding.sampler = active_sampler;
SDL_BindGPUFragmentSamplers(pass, 0, &binding, 1);
SDL_PushGPUFragmentUniformData(cmd, 0, &uniforms_, sizeof(PostFXUniforms));
SDL_DrawGPUPrimitives(pass, 3, 1, 0, 0);
SDL_EndGPURenderPass(pass);
}
SDL_SubmitGPUCommandBuffer(cmd);
}
// ---------------------------------------------------------------------------
// cleanup — libera pipeline/texturas/buffer pero mantiene device + swapchain
// ---------------------------------------------------------------------------
void SDL3GPUShader::cleanup() {
is_initialized_ = false;
if (device_ != nullptr) {
SDL_WaitForGPUIdle(device_);
if (pipeline_ != nullptr) {
SDL_ReleaseGPUGraphicsPipeline(device_, pipeline_);
pipeline_ = nullptr;
}
if (scene_texture_ != nullptr) {
SDL_ReleaseGPUTexture(device_, scene_texture_);
scene_texture_ = nullptr;
}
if (upload_buffer_ != nullptr) {
SDL_ReleaseGPUTransferBuffer(device_, upload_buffer_);
upload_buffer_ = nullptr;
}
if (sampler_ != nullptr) {
SDL_ReleaseGPUSampler(device_, sampler_);
sampler_ = nullptr;
}
if (linear_sampler_ != nullptr) {
SDL_ReleaseGPUSampler(device_, linear_sampler_);
linear_sampler_ = nullptr;
}
// device_ y el claim de la ventana se mantienen vivos
}
}
// ---------------------------------------------------------------------------
// destroy — limpieza completa incluyendo device y swapchain (solo al cerrar)
// ---------------------------------------------------------------------------
void SDL3GPUShader::destroy() {
cleanup();
if (device_ != nullptr) {
if (window_ != nullptr) {
SDL_ReleaseWindowFromGPUDevice(device_, window_);
}
SDL_DestroyGPUDevice(device_);
device_ = nullptr;
}
window_ = nullptr;
}
// ---------------------------------------------------------------------------
// Shader creation helpers
// ---------------------------------------------------------------------------
auto SDL3GPUShader::createShaderMSL(SDL_GPUDevice* device,
const char* msl_source,
const char* entrypoint,
SDL_GPUShaderStage stage,
Uint32 num_samplers,
Uint32 num_uniform_buffers) -> SDL_GPUShader* {
SDL_GPUShaderCreateInfo info = {};
info.code = reinterpret_cast<const Uint8*>(msl_source);
info.code_size = std::strlen(msl_source) + 1;
info.entrypoint = entrypoint;
info.format = SDL_GPU_SHADERFORMAT_MSL;
info.stage = stage;
info.num_samplers = num_samplers;
info.num_uniform_buffers = num_uniform_buffers;
SDL_GPUShader* shader = SDL_CreateGPUShader(device, &info);
if (shader == nullptr) {
SDL_Log("SDL3GPUShader: MSL shader '%s' failed: %s", entrypoint, SDL_GetError());
}
return shader;
}
auto SDL3GPUShader::createShaderSPIRV(SDL_GPUDevice* device, // NOLINT(readability-convert-member-functions-to-static)
const uint8_t* spv_code,
size_t spv_size,
const char* entrypoint,
SDL_GPUShaderStage stage,
Uint32 num_samplers,
Uint32 num_uniform_buffers) -> SDL_GPUShader* {
SDL_GPUShaderCreateInfo info = {};
info.code = spv_code;
info.code_size = spv_size;
info.entrypoint = entrypoint;
info.format = SDL_GPU_SHADERFORMAT_SPIRV;
info.stage = stage;
info.num_samplers = num_samplers;
info.num_uniform_buffers = num_uniform_buffers;
SDL_GPUShader* shader = SDL_CreateGPUShader(device, &info);
if (shader == nullptr) {
SDL_Log("SDL3GPUShader: SPIRV shader '%s' failed: %s", entrypoint, SDL_GetError());
}
return shader;
}
void SDL3GPUShader::setPostFXParams(const PostFXParams& p) {
uniforms_.vignette_strength = p.vignette;
uniforms_.chroma_strength = p.chroma;
uniforms_.mask_strength = p.mask;
uniforms_.gamma_strength = p.gamma;
uniforms_.curvature = p.curvature;
uniforms_.bleeding = p.bleeding;
uniforms_.flicker = p.flicker;
// Con supersampling las scanlines se hornean en CPU (uploadPixels).
// El shader recibe strength=0 para no aplicarlas de nuevo en GPU.
baked_scanline_strength_ = p.scanlines;
uniforms_.scanline_strength = (oversample_ > 1) ? 0.0F : p.scanlines;
}
void SDL3GPUShader::setVSync(bool vsync) {
vsync_ = vsync;
if (device_ != nullptr && window_ != nullptr) {
SDL_SetGPUSwapchainParameters(device_, window_, SDL_GPU_SWAPCHAINCOMPOSITION_SDR, vsync_ ? SDL_GPU_PRESENTMODE_VSYNC : SDL_GPU_PRESENTMODE_IMMEDIATE);
}
}
void SDL3GPUShader::setScaleMode(bool integer_scale) {
integer_scale_ = integer_scale;
}
// ---------------------------------------------------------------------------
// setOversample — cambia el factor SS; recrea texturas si ya está inicializado
// ---------------------------------------------------------------------------
void SDL3GPUShader::setOversample(int factor) {
const int NEW_FACTOR = std::max(1, factor);
if (NEW_FACTOR == oversample_) { return; }
oversample_ = NEW_FACTOR;
if (is_initialized_) {
reinitTexturesAndBuffer();
// scanline_strength se actualizará en el próximo setPostFXParams
}
}
// ---------------------------------------------------------------------------
// reinitTexturesAndBuffer — recrea scene_texture_ y upload_buffer_ con el
// tamaño actual (game × oversample_). No toca pipeline ni samplers.
// ---------------------------------------------------------------------------
auto SDL3GPUShader::reinitTexturesAndBuffer() -> bool {
if (device_ == nullptr) { return false; }
SDL_WaitForGPUIdle(device_);
if (scene_texture_ != nullptr) {
SDL_ReleaseGPUTexture(device_, scene_texture_);
scene_texture_ = nullptr;
}
if (upload_buffer_ != nullptr) {
SDL_ReleaseGPUTransferBuffer(device_, upload_buffer_);
upload_buffer_ = nullptr;
}
tex_width_ = game_width_ * oversample_;
tex_height_ = game_height_ * oversample_;
uniforms_.screen_height = static_cast<float>(tex_height_);
uniforms_.oversample = static_cast<float>(oversample_);
SDL_GPUTextureCreateInfo tex_info = {};
tex_info.type = SDL_GPU_TEXTURETYPE_2D;
tex_info.format = SDL_GPU_TEXTUREFORMAT_B8G8R8A8_UNORM;
tex_info.usage = SDL_GPU_TEXTUREUSAGE_SAMPLER;
tex_info.width = static_cast<Uint32>(tex_width_);
tex_info.height = static_cast<Uint32>(tex_height_);
tex_info.layer_count_or_depth = 1;
tex_info.num_levels = 1;
scene_texture_ = SDL_CreateGPUTexture(device_, &tex_info);
if (scene_texture_ == nullptr) {
SDL_Log("SDL3GPUShader: reinit — failed to create scene texture: %s", SDL_GetError());
return false;
}
SDL_GPUTransferBufferCreateInfo tb_info = {};
tb_info.usage = SDL_GPU_TRANSFERBUFFERUSAGE_UPLOAD;
tb_info.size = static_cast<Uint32>(tex_width_ * tex_height_ * 4);
upload_buffer_ = SDL_CreateGPUTransferBuffer(device_, &tb_info);
if (upload_buffer_ == nullptr) {
SDL_Log("SDL3GPUShader: reinit — failed to create upload buffer: %s", SDL_GetError());
SDL_ReleaseGPUTexture(device_, scene_texture_);
scene_texture_ = nullptr;
return false;
}
SDL_Log("SDL3GPUShader: oversample %d → texture %dx%d", oversample_, tex_width_, tex_height_);
return true;
}
} // namespace Rendering

106
source/rendering/sdl3gpu/sdl3gpu_shader.hpp Normal file
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@@ -0,0 +1,106 @@
#pragma once
#include <SDL3/SDL.h>
#include <SDL3/SDL_gpu.h>
#include "rendering/shader_backend.hpp"
// PostFX uniforms pushed to fragment stage each frame.
// Must match the MSL struct and GLSL uniform block layout.
// 12 floats = 48 bytes — meets Metal/Vulkan 16-byte alignment requirement.
struct PostFXUniforms {
float vignette_strength; // 0 = none, ~0.8 = subtle
float chroma_strength; // 0 = off, ~0.2 = subtle chromatic aberration
float scanline_strength; // 0 = off, 1 = full
float screen_height; // logical height in pixels (used by bleeding effect)
float mask_strength; // 0 = off, 1 = full phosphor dot mask
float gamma_strength; // 0 = off, 1 = full gamma 2.4/2.2 correction
float curvature; // 0 = flat, 1 = max barrel distortion
float bleeding; // 0 = off, 1 = max NTSC chrominance bleeding
float pixel_scale; // physical pixels per logical pixel (vh / tex_height_)
float time; // seconds since SDL init (SDL_GetTicks() / 1000.0f)
float oversample; // supersampling factor (1.0 = off, 3.0 = 3×SS)
float flicker; // 0 = off, 1 = phosphor flicker ~50 Hz — keep struct at 48 bytes (3 × 16)
};
namespace Rendering {
/**
* @brief Backend de shaders usando SDL3 GPU API (Metal en macOS, Vulkan/SPIR-V en Win/Linux)
*
* Reemplaza el backend OpenGL para que los shaders PostFX funcionen en macOS.
* Pipeline: Surface pixels (CPU) → SDL_GPUTransferBuffer → SDL_GPUTexture (scene)
* → PostFX render pass → swapchain → present
*/
class SDL3GPUShader : public ShaderBackend {
public:
SDL3GPUShader() = default;
~SDL3GPUShader() override;
auto init(SDL_Window* window,
SDL_Texture* texture,
const std::string& vertex_source,
const std::string& fragment_source) -> bool override;
void render() override;
void setTextureSize(float width, float height) override {}
void cleanup() final; // Libera pipeline/texturas pero mantiene el device vivo
void destroy(); // Limpieza completa (device + swapchain); llamar solo al cerrar
[[nodiscard]] auto isHardwareAccelerated() const -> bool override { return is_initialized_; }
// Sube píxeles ARGB8888 desde CPU; llamado antes de render()
void uploadPixels(const Uint32* pixels, int width, int height) override;
// Actualiza los parámetros de intensidad de los efectos PostFX
void setPostFXParams(const PostFXParams& p) override;
// Activa/desactiva VSync en el swapchain
void setVSync(bool vsync) override;
// Activa/desactiva escalado entero (integer scale)
void setScaleMode(bool integer_scale) override;
// Establece factor de supersampling (1 = off, 3 = 3×SS)
void setOversample(int factor) override;
private:
static auto createShaderMSL(SDL_GPUDevice* device,
const char* msl_source,
const char* entrypoint,
SDL_GPUShaderStage stage,
Uint32 num_samplers,
Uint32 num_uniform_buffers) -> SDL_GPUShader*;
static auto createShaderSPIRV(SDL_GPUDevice* device,
const uint8_t* spv_code,
size_t spv_size,
const char* entrypoint,
SDL_GPUShaderStage stage,
Uint32 num_samplers,
Uint32 num_uniform_buffers) -> SDL_GPUShader*;
auto createPipeline() -> bool;
auto reinitTexturesAndBuffer() -> bool; // Recrea textura y buffer con oversample actual
SDL_Window* window_ = nullptr;
SDL_GPUDevice* device_ = nullptr;
SDL_GPUGraphicsPipeline* pipeline_ = nullptr;
SDL_GPUTexture* scene_texture_ = nullptr;
SDL_GPUTransferBuffer* upload_buffer_ = nullptr;
SDL_GPUSampler* sampler_ = nullptr; // NEAREST — para path sin supersampling
SDL_GPUSampler* linear_sampler_ = nullptr; // LINEAR — para path con supersampling
PostFXUniforms uniforms_{.vignette_strength = 0.6F, .chroma_strength = 0.15F, .scanline_strength = 0.7F, .screen_height = 192.0F, .pixel_scale = 1.0F, .oversample = 1.0F};
int game_width_ = 0; // Dimensiones originales del canvas (sin SS)
int game_height_ = 0;
int tex_width_ = 0; // Dimensiones de la textura GPU (game × oversample_)
int tex_height_ = 0;
int oversample_ = 1; // Factor SS actual (1 o 3)
float baked_scanline_strength_ = 0.0F; // Guardado para hornear en CPU
bool is_initialized_ = false;
bool vsync_ = true;
bool integer_scale_ = false;
};
} // namespace Rendering

20
source/rendering/shader_backend.hpp
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@@ -6,6 +6,20 @@
namespace Rendering {
/**
* @brief Parámetros de intensidad de los efectos PostFX
*/
struct PostFXParams {
float vignette = 0.0F;
float scanlines = 0.0F;
float chroma = 0.0F;
float mask = 0.0F;
float gamma = 0.0F;
float curvature = 0.0F;
float bleeding = 0.0F;
float flicker = 0.0F;
};
/**
* @brief Interfaz abstracta para backends de renderizado con shaders
*
@@ -51,6 +65,12 @@ namespace Rendering {
* @return true si usa aceleración (OpenGL/Metal/Vulkan)
*/
[[nodiscard]] virtual auto isHardwareAccelerated() const -> bool = 0;
virtual void uploadPixels(const Uint32* /*pixels*/, int /*width*/, int /*height*/) {}
virtual void setPostFXParams(const PostFXParams& /*p*/) {}
virtual void setVSync(bool /*vsync*/) {}
virtual void setScaleMode(bool /*integer_scale*/) {}
virtual void setOversample(int /*factor*/) {}
};
} // namespace Rendering