使用自定义着色器绘制

src/main.cpp

@@ -11,6 +11,9 @@
 #include "SDL3_ttf/SDL_ttf.h"
 
 #include <d3d12.h>
+#include <random>
+
+#include "test_layout.h"
 
 void EnableD3D12DebugLayer() {
     ID3D12Debug* debugController;
@@ -52,6 +55,28 @@ int main(int argc, char* argv[]) {
         SDL_DestroyWindow(window);
         return 1;
     }
+    test_shader::vertex_t v1{};
+    test_shader::vertex_t v2{};
+    test_shader::vertex_t v3{};
+    v1.position[0] = 0.f; v1.position[1] = 1.f; // 上
+    v1.uv[0] = 0.0f; v1.uv[1] = 1.0f;
+
+    v2.position[0] = -1.f; v2.position[1] = -1.f; // 左
+    v2.uv[0] = 1.0f; v2.uv[1] = 1.0f;
+
+    v3.position[0] = 1.f; v3.position[1] = -1.f; // 右
+    v3.uv[0] = 0.0f; v3.uv[1] = 0.0f;
+    std::array vertexs = {
+        v1, v2, v3
+    };
+    auto vertex_buffer = test_shader::create_vertex_buffer(gpu_device, vertexs.data(), vertexs.size());
+    if (!vertex_buffer) {
+        SDL_Log("Failed to create vertex buffer: %s", SDL_GetError());
+        shader_handle.clear(gpu_device);
+        SDL_DestroyRenderer(renderer);
+        SDL_DestroyWindow(window);
+        return 1;
+    }
 
     TTF_Init();
 
@@ -96,8 +121,22 @@ int main(int argc, char* argv[]) {
     SDL_GetTextureSize(texture, &text_width, &text_height);
     SDL_FRect dest_rect = { 0, 0, text_width, text_height };
 
-    SDL_Event e;
-    bool running = true;
+    SDL_GPURenderStateDesc desc{};
+    SDL_INIT_INTERFACE(&desc);
+    desc.fragment_shader                  = shader_handle.get_fragment_shader();
+    desc.num_sampler_bindings             = 0;
+    desc.num_storage_textures             = 0;
+    desc.num_storage_buffers              = 0;
+    auto                     render_state = SDL_CreateGPURenderState(renderer, &desc);
+
+    SDL_FRect shader_rect = { 0, text_height, text_width, text_height };
+
+
+    // 生成随机数
+    std::random_device rd;
+
+    SDL_Event          e;
+    bool               running = true;
     while (running) {
         while (SDL_PollEvent(&e)) {
             if (e.type == SDL_EVENT_QUIT) {
@@ -106,11 +145,28 @@ int main(int argc, char* argv[]) {
         }
 
         // 正确的渲染顺序
-        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);             // 黑色背景
-        SDL_RenderClear(renderer);                                  // 先清屏
-        SDL_RenderTexture(renderer, texture, nullptr, &dest_rect);  // 然后绘制文字
+        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+        // 清空屏幕
+        SDL_RenderClear(renderer);
+        // 绘制文字
+        SDL_RenderTexture(renderer, texture, nullptr, &dest_rect);
+
+        test_shader::ParamBuffer param_buffer{};
+        // 随机颜色
+        param_buffer.color[0] = static_cast<float>(rd() % 256) / 255.0f; // R
+        param_buffer.color[1] = static_cast<float>(rd() % 256) / 255.0f; // G
+        param_buffer.color[2] = static_cast<float>(rd() % 256) / 255.0f; // B
+        param_buffer.color[3] = 1.0f; // A
+
+        SDL_SetGPURenderStateFragmentUniforms(render_state, 0, &param_buffer, sizeof(param_buffer));
+        // 绘制自定义图形
+        SDL_SetRenderGPUState(renderer, render_state);
+        // 使用自定义着色器绘制一个面片
+        SDL_RenderFillRect(renderer, &shader_rect);
+        // 重置GPUState
+        SDL_SetRenderGPUState(renderer, nullptr);
+
         SDL_RenderPresent(renderer);                                // 最后呈现
-        SDL_RenderLines(renderer, nullptr, 0);                      // 确保没有多余的线条
         std::this_thread::sleep_for(std::chrono::milliseconds(16)); // ~60 FPS
     }