reestructuració

source/core/rendering/sdl3gpu/sdl3gpu_shader.hpp

@@ -0,0 +1,154 @@
+#pragma once
+
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_gpu.h>
+
+#include <string>
+#include <utility>
+
+#include "rendering/shader_backend.hpp"
+
+// PostFX uniforms pushed to fragment stage each frame.
+// 12 floats = 48 bytes — meets Metal/Vulkan 16-byte alignment requirement.
+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;
+    float flicker;
+};
+
+// CrtPi uniforms pushed to fragment stage each frame.
+// 16 fields = 64 bytes — 4 × 16-byte alignment.
+struct CrtPiUniforms {
+    float scanline_weight;
+    float scanline_gap_brightness;
+    float bloom_factor;
+    float input_gamma;
+    float output_gamma;
+    float mask_brightness;
+    float curvature_x;
+    float curvature_y;
+    int mask_type;
+    int enable_scanlines;
+    int enable_multisample;
+    int enable_gamma;
+    int enable_curvature;
+    int enable_sharper;
+    float texture_width;
+    float texture_height;
+};
+
+// Downscale uniforms for Lanczos downscale fragment stage.
+// 1 int + 3 floats = 16 bytes.
+struct DownscaleUniforms {
+    int algorithm;
+    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)
+     *
+     * Pipeline: Surface pixels (CPU) → SDL_GPUTransferBuffer → SDL_GPUTexture (scene)
+     *           → [Upscale →] PostFX/CrtPi render pass → [Lanczos downscale →] 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;
+        void destroy();
+        [[nodiscard]] auto isHardwareAccelerated() const -> bool override { return is_initialized_; }
+        [[nodiscard]] auto getDriverName() const -> std::string override { return driver_name_; }
+
+        void setPreferredDriver(const std::string& driver) override { preferred_driver_ = driver; }
+        void uploadPixels(const Uint32* pixels, int width, int height) override;
+        void setPostFXParams(const PostFXParams& p) override;
+        void setVSync(bool vsync) override;
+        void setScaleMode(bool integer_scale) override;
+        void setOversample(int factor) override;
+
+        void setLinearUpscale(bool linear) override;
+        [[nodiscard]] auto isLinearUpscale() const -> bool override { return linear_upscale_; }
+        void setDownscaleAlgo(int algo) override;
+        [[nodiscard]] auto getDownscaleAlgo() const -> int override { return downscale_algo_; }
+        [[nodiscard]] auto getSsTextureSize() const -> std::pair<int, int> override;
+
+        void setActiveShader(ShaderType type) override;
+        void setCrtPiParams(const CrtPiParams& p) override;
+        [[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;
+        auto reinitTexturesAndBuffer() -> bool;
+        auto recreateScaledTexture(int factor) -> bool;
+        static auto calcSsFactor(float zoom) -> int;
+        [[nodiscard]] auto bestPresentMode(bool vsync) const -> SDL_GPUPresentMode;
+
+        SDL_Window* window_ = nullptr;
+        SDL_GPUDevice* device_ = nullptr;
+        SDL_GPUGraphicsPipeline* pipeline_ = nullptr;
+        SDL_GPUGraphicsPipeline* crtpi_pipeline_ = nullptr;
+        SDL_GPUGraphicsPipeline* postfx_offscreen_pipeline_ = nullptr;
+        SDL_GPUGraphicsPipeline* upscale_pipeline_ = nullptr;
+        SDL_GPUGraphicsPipeline* downscale_pipeline_ = nullptr;
+        SDL_GPUTexture* scene_texture_ = nullptr;
+        SDL_GPUTexture* scaled_texture_ = nullptr;
+        SDL_GPUTexture* postfx_texture_ = nullptr;
+        SDL_GPUTransferBuffer* upload_buffer_ = nullptr;
+        SDL_GPUSampler* sampler_ = nullptr;
+        SDL_GPUSampler* linear_sampler_ = nullptr;
+
+        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;
+
+        int game_width_ = 0;
+        int game_height_ = 0;
+        int ss_factor_ = 0;
+        int oversample_ = 1;
+        int downscale_algo_ = 1;
+        std::string driver_name_;
+        std::string preferred_driver_;
+        bool is_initialized_ = false;
+        bool vsync_ = true;
+        bool integer_scale_ = false;
+        bool linear_upscale_ = false;
+    };
+
+}  // namespace Rendering