This commit is contained in:
2026-04-17 19:04:44 +02:00
parent 5fec0110b3
commit 1bb0ebdef8
30 changed files with 45791 additions and 23 deletions

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#pragma once
#include <SDL3/SDL.h>
#include <SDL3/SDL_gpu.h>
#include "core/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)
};
// CrtPi uniforms pushed to fragment stage each frame.
// Must match the MSL struct and GLSL uniform block layout.
// 14 fields (8 floats + 6 ints) + 2 floats (texture size) = 16 fields = 64 bytes — 4 × 16-byte alignment.
struct CrtPiUniforms {
// vec4 #0
float scanline_weight; // Ajuste gaussiano (default 6.0)
float scanline_gap_brightness; // Brillo mínimo entre scanlines (default 0.12)
float bloom_factor; // Factor brillo zonas iluminadas (default 3.5)
float input_gamma; // Gamma de entrada (default 2.4)
// vec4 #1
float output_gamma; // Gamma de salida (default 2.2)
float mask_brightness; // Brillo sub-píxeles máscara (default 0.80)
float curvature_x; // Distorsión barrel X (default 0.05)
float curvature_y; // Distorsión barrel Y (default 0.10)
// vec4 #2
int mask_type; // 0=ninguna, 1=verde/magenta, 2=RGB fósforo
int enable_scanlines; // 0 = off, 1 = on
int enable_multisample; // 0 = off, 1 = on (antialiasing analítico)
int enable_gamma; // 0 = off, 1 = on
// vec4 #3
int enable_curvature; // 0 = off, 1 = on
int enable_sharper; // 0 = off, 1 = on
float texture_width; // Ancho del canvas en píxeles (inyectado en render)
float texture_height; // Alto del canvas en píxeles (inyectado en render)
};
// Downscale uniforms pushed to the Lanczos downscale fragment stage.
// 1 int + 3 floats = 16 bytes — meets Metal/Vulkan alignment.
struct DownscaleUniforms {
int algorithm; // 0 = Lanczos2 (ventana 2), 1 = Lanczos3 (ventana 3)
float pad0;
float pad1;
float pad2;
};
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_; }
[[nodiscard]] auto getDriverName() const -> std::string override { return driver_name_; }
// Establece el driver GPU preferido (vacío = auto). Debe llamarse antes de init().
void setPreferredDriver(const std::string& driver) override { preferred_driver_ = driver; }
// 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;
// Activa/desactiva interpolación LINEAR en el upscale (false = NEAREST)
void setLinearUpscale(bool linear) override;
// Selecciona algoritmo de downscale: 0=bilinear legacy, 1=Lanczos2, 2=Lanczos3
void setDownscaleAlgo(int algo) override;
// Devuelve las dimensiones de la textura de supersampling (0,0 si SS desactivado)
[[nodiscard]] auto getSsTextureSize() const -> std::pair<int, int> override;
// Selecciona el shader de post-procesado activo (POSTFX o CRTPI)
void setActiveShader(ShaderType type) override;
// Actualiza los parámetros del shader CRT-Pi
void setCrtPiParams(const CrtPiParams& p) override;
// Devuelve el shader activo
[[nodiscard]] auto getActiveShader() const -> ShaderType override { return active_shader_; }
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 createCrtPiPipeline() -> bool; // Pipeline dedicado para el shader CrtPi
auto reinitTexturesAndBuffer() -> bool; // Recrea scene_texture_ y upload_buffer_
auto recreateScaledTexture(int factor) -> bool; // Recrea scaled_texture_ para factor dado
static auto calcSsFactor(float zoom) -> int; // Primer múltiplo de 3 >= zoom (mín 3)
// Devuelve el mejor present mode disponible: IMMEDIATE > MAILBOX > VSYNC
[[nodiscard]] auto bestPresentMode(bool vsync) const -> SDL_GPUPresentMode;
SDL_Window* window_ = nullptr;
SDL_GPUDevice* device_ = nullptr;
SDL_GPUGraphicsPipeline* pipeline_ = nullptr; // PostFX pass (→ swapchain o → postfx_texture_)
SDL_GPUGraphicsPipeline* crtpi_pipeline_ = nullptr; // CrtPi pass (→ swapchain directo, sin SS)
SDL_GPUGraphicsPipeline* postfx_offscreen_pipeline_ = nullptr; // PostFX → postfx_texture_ (B8G8R8A8, solo con Lanczos)
SDL_GPUGraphicsPipeline* upscale_pipeline_ = nullptr; // Upscale pass (solo con SS)
SDL_GPUGraphicsPipeline* downscale_pipeline_ = nullptr; // Lanczos downscale (solo con SS + algo > 0)
SDL_GPUTexture* scene_texture_ = nullptr; // Canvas del juego (game_width_ × game_height_)
SDL_GPUTexture* scaled_texture_ = nullptr; // Upscale target (game×factor), solo con SS
SDL_GPUTexture* postfx_texture_ = nullptr; // PostFX output a resolución escalada, solo con Lanczos
SDL_GPUTransferBuffer* upload_buffer_ = nullptr;
SDL_GPUSampler* sampler_ = nullptr; // NEAREST
SDL_GPUSampler* linear_sampler_ = nullptr; // LINEAR
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};
CrtPiUniforms crtpi_uniforms_{.scanline_weight = 6.0F, .scanline_gap_brightness = 0.12F, .bloom_factor = 3.5F, .input_gamma = 2.4F, .output_gamma = 2.2F, .mask_brightness = 0.80F, .curvature_x = 0.05F, .curvature_y = 0.10F, .mask_type = 2, .enable_scanlines = 1, .enable_multisample = 1, .enable_gamma = 1};
ShaderType active_shader_ = ShaderType::POSTFX; // Shader de post-procesado activo
int game_width_ = 0; // Dimensiones originales del canvas
int game_height_ = 0;
int ss_factor_ = 0; // Factor SS activo (3, 6, 9...) o 0 si SS desactivado
int oversample_ = 1; // SS on/off (1 = off, >1 = on)
int downscale_algo_ = 1; // 0 = bilinear legacy, 1 = Lanczos2, 2 = Lanczos3
std::string driver_name_;
std::string preferred_driver_; // Driver preferido; vacío = auto (SDL elige)
bool is_initialized_ = false;
bool vsync_ = true;
bool integer_scale_ = false;
bool linear_upscale_ = false; // Upscale NEAREST (false) o LINEAR (true)
};
} // namespace Rendering

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DisableFormat: true
SortIncludes: Never

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# source/core/rendering/sdl3gpu/spv/.clang-tidy
Checks: '-*'
WarningsAsErrors: ''
HeaderFilterRegex: ''

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#pragma once
#include <cstddef>
#include <cstdint>
static const uint8_t kupscale_frag_spv[] = {
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static const size_t kupscale_frag_spv_size = 628;