205 lines
9.4 KiB
C++
205 lines
9.4 KiB
C++
#pragma once
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_gpu.h>
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#include "core/rendering/shader_backend.hpp"
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// PostFX uniforms pushed to fragment stage each frame.
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// Must match the MSL struct and GLSL uniform block layout.
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// 16 floats = 64 bytes (4 × vec4) — meets Metal/Vulkan 16-byte alignment.
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struct PostFXUniforms {
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// vec4 #0
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float vignette_strength; // 0 = none, ~0.8 = subtle
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float chroma_min; // aberració cromàtica mínima (sempre present)
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float scanline_strength; // 0 = off, 1 = full
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float screen_height; // logical height in pixels (used by bleeding effect)
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// vec4 #1
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float mask_strength; // 0 = off, 1 = full phosphor dot mask
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float gamma_strength; // 0 = off, 1 = full gamma 2.4/2.2 correction
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float curvature; // 0 = flat, 1 = max barrel distortion
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float bleeding; // 0 = off, 1 = max NTSC chrominance bleeding
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// vec4 #2
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float pixel_scale; // physical pixels per logical pixel (vh / tex_height_)
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float time; // seconds since SDL init (SDL_GetTicks() / 1000.0f)
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float flicker; // 0 = off, 1 = phosphor flicker ~50 Hz
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float chroma_max; // si == chroma_min queda estàtic; si != pulsa sinusoidalment
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// vec4 #3 — paràmetres de forma de les scanlines (exposats per preset)
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float scan_dark_ratio; // fracció de subfila fosca (1/3 = 0.333 per defecte)
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float scan_dark_floor; // brillantor de la subfila fosca (0.42 per defecte)
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float scan_edge_soft; // suavitzat de la transició (0 = step dur, 1 = 1px físic)
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float pad3;
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};
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// CrtPi uniforms pushed to fragment stage each frame.
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// Must match the MSL struct and GLSL uniform block layout.
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// 14 fields (8 floats + 6 ints) + 2 floats (texture size) = 16 fields = 64 bytes — 4 × 16-byte alignment.
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struct CrtPiUniforms {
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// vec4 #0
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float scanline_weight; // Ajuste gaussiano (default 6.0)
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float scanline_gap_brightness; // Brillo mínimo entre scanlines (default 0.12)
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float bloom_factor; // Factor brillo zonas iluminadas (default 3.5)
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float input_gamma; // Gamma de entrada (default 2.4)
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// vec4 #1
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float output_gamma; // Gamma de salida (default 2.2)
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float mask_brightness; // Brillo sub-píxeles máscara (default 0.80)
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float curvature_x; // Distorsión barrel X (default 0.05)
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float curvature_y; // Distorsión barrel Y (default 0.10)
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// vec4 #2
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int mask_type; // 0=ninguna, 1=verde/magenta, 2=RGB fósforo
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int enable_scanlines; // 0 = off, 1 = on
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int enable_multisample; // 0 = off, 1 = on (antialiasing analítico)
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int enable_gamma; // 0 = off, 1 = on
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// vec4 #3
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int enable_curvature; // 0 = off, 1 = on
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int enable_sharper; // 0 = off, 1 = on
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float texture_width; // Ancho del canvas en píxeles (inyectado en render)
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float texture_height; // Alto del canvas en píxeles (inyectado en render)
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};
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namespace Rendering {
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/**
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* @brief Backend de shaders usando SDL3 GPU API (Metal en macOS, Vulkan/SPIR-V en Win/Linux)
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*
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* Reemplaza el backend OpenGL para que los shaders PostFX funcionen en macOS.
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* Pipeline: Surface pixels (CPU) → SDL_GPUTransferBuffer → SDL_GPUTexture (scene)
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* → PostFX render pass → swapchain → present
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*/
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class SDL3GPUShader : public ShaderBackend {
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public:
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SDL3GPUShader() = default;
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~SDL3GPUShader() override;
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auto init(SDL_Window* window,
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SDL_Texture* texture,
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const std::string& vertex_source,
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const std::string& fragment_source) -> bool override;
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void render() override;
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void setTextureSize(float /*width*/, float /*height*/) override {}
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void cleanup() final; // Libera pipeline/texturas pero mantiene el device vivo
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void destroy(); // Limpieza completa (device + swapchain); llamar solo al cerrar
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[[nodiscard]] auto isHardwareAccelerated() const -> bool override { return is_initialized_; }
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[[nodiscard]] auto getDriverName() const -> std::string override { return driver_name_; }
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// Establece el driver GPU preferido (vacío = auto). Debe llamarse antes de init().
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void setPreferredDriver(const std::string& driver) override { preferred_driver_ = driver; }
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// Sube píxeles ARGB8888 desde CPU; llamado antes de render()
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void uploadPixels(const Uint32* pixels, int width, int height) override;
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// Actualiza los parámetros de intensidad de los efectos PostFX
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void setPostFXParams(const PostFXParams& p) override;
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// Activa/desactiva VSync en el swapchain
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void setVSync(bool vsync) override;
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// Selecciona el mode de presentació lògica (DISABLED/STRETCH/LETTERBOX/OVERSCAN/INTEGER)
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void setScalingMode(Options::ScalingMode mode) override;
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// Selecciona el shader de post-procesado activo (POSTFX o CRTPI)
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void setActiveShader(ShaderType type) override;
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// Actualiza los parámetros del shader CRT-Pi
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void setCrtPiParams(const CrtPiParams& p) override;
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// Devuelve el shader activo
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[[nodiscard]] auto getActiveShader() const -> ShaderType override { return active_shader_; }
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// Estirament vertical 4:3 (fusionat amb l'upscale pass)
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void setStretch43(bool enabled) override;
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[[nodiscard]] auto isStretch43() const -> bool override { return stretch_4_3_; }
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// Filtre de textura global (sempre aplicat, independent de 4:3)
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void setTextureFilter(Options::TextureFilter filter) override {
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texture_filter_linear_ = (filter == Options::TextureFilter::LINEAR);
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}
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// Multiplicador de resolució interna (1 = off).
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void setInternalResolution(int multiplier) override;
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private:
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static auto createShaderMSL(SDL_GPUDevice* device,
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const char* msl_source,
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const char* entrypoint,
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SDL_GPUShaderStage stage,
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Uint32 num_samplers,
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Uint32 num_uniform_buffers) -> SDL_GPUShader*;
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static auto createShaderSPIRV(SDL_GPUDevice* device,
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const uint8_t* spv_code,
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size_t spv_size,
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const char* entrypoint,
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SDL_GPUShaderStage stage,
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Uint32 num_samplers,
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Uint32 num_uniform_buffers) -> SDL_GPUShader*;
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auto createPipeline() -> bool;
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auto createCrtPiPipeline() -> bool; // Pipeline dedicado para el shader CrtPi
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auto reinitTexturesAndBuffer() -> bool; // Recrea scene_texture_ y upload_buffer_
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auto recreateInternalTexture() -> bool; // Recrea internal_texture_ (res interna × N)
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// Devuelve el mejor present mode disponible: IMMEDIATE > MAILBOX > VSYNC
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[[nodiscard]] auto bestPresentMode(bool vsync) const -> SDL_GPUPresentMode;
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SDL_Window* window_ = nullptr;
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SDL_GPUDevice* device_ = nullptr;
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SDL_GPUGraphicsPipeline* pipeline_ = nullptr; // PostFX pass → swapchain
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SDL_GPUGraphicsPipeline* crtpi_pipeline_ = nullptr; // CrtPi pass → swapchain
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SDL_GPUGraphicsPipeline* upscale_pipeline_ = nullptr; // Upscale per al pas de resolució interna
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SDL_GPUTexture* scene_texture_ = nullptr; // Canvas del joc (game_width_ × game_height_)
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SDL_GPUTexture* internal_texture_ = nullptr; // Resolució interna ampliada (game·N × game·N), si N>1
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SDL_GPUTransferBuffer* upload_buffer_ = nullptr;
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SDL_GPUSampler* sampler_ = nullptr; // NEAREST
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SDL_GPUSampler* linear_sampler_ = nullptr; // LINEAR (per texture_filter_linear_)
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PostFXUniforms uniforms_{
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.vignette_strength = 0.6F,
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.chroma_min = 0.15F,
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.scanline_strength = 0.7F,
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.screen_height = 200.0F,
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.mask_strength = 0.0F,
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.gamma_strength = 0.0F,
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.curvature = 0.0F,
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.bleeding = 0.0F,
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.pixel_scale = 1.0F,
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.time = 0.0F,
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.flicker = 0.0F,
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.chroma_max = 0.15F,
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.scan_dark_ratio = 0.333F,
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.scan_dark_floor = 0.42F,
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.scan_edge_soft = 1.0F,
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.pad3 = 0.0F};
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CrtPiUniforms crtpi_uniforms_{
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.scanline_weight = 6.0F,
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.scanline_gap_brightness = 0.12F,
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.bloom_factor = 3.5F,
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.input_gamma = 2.4F,
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.output_gamma = 2.2F,
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.mask_brightness = 0.80F,
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.curvature_x = 0.05F,
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.curvature_y = 0.10F,
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.mask_type = 2,
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.enable_scanlines = 1,
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.enable_multisample = 1,
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.enable_gamma = 1,
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.enable_curvature = 0,
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.enable_sharper = 0,
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.texture_width = 0.0F,
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.texture_height = 0.0F};
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ShaderType active_shader_ = ShaderType::POSTFX; // Shader de post-procesado activo
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int game_width_ = 0; // Dimensions originals del canvas
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int game_height_ = 0;
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int internal_res_ = 1; // Multiplicador de resolució interna (1 = off)
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std::string driver_name_;
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std::string preferred_driver_; // Driver preferido; vacío = auto (SDL elige)
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bool is_initialized_ = false;
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bool vsync_ = true;
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Options::ScalingMode scaling_mode_ = Options::ScalingMode::INTEGER;
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bool stretch_4_3_ = false; // Estirament vertical 4:3
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bool texture_filter_linear_ = false; // Filtre global (false=NEAREST, true=LINEAR)
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};
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} // namespace Rendering
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