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/* sdl_gpu_test.c -- -lSDL3 */
#define SDL_MAIN_USE_CALLBACKS 1
#include <SDL3/SDL_main.h>
#include <SDL3/SDL_gpu.h>
#include <stdio.h>
#include <err.h>
SDL_Window *win;
SDL_GPUDevice *gpudev;
SDL_GPUGraphicsPipeline *pipeline_fill;
SDL_GPUBuffer *buf_vert;
SDL_GPUTransferBuffer *buf_vert_xfer;
float vertices[][2] = {
{ 0.5, -0.5 },
{ 0.5, 0.5 },
{ -0.5, -0.5 },
{ -0.5, -0.5 },
{ -0.5, 0.5 },
{ 0.5, 0.5 },
};
SDL_GPUShader* load_shader(
SDL_GPUDevice* dev,
const char *path,
SDL_GPUShaderStage stage,
Uint32 samplers,
Uint32 uniformbufs,
Uint32 storagebufs,
Uint32 storagetextures)
{
size_t code_size;
void *code = SDL_LoadFile(path, &code_size);
if (!code) {
fprintf(stderr, "couldn't read file: %s\n", SDL_GetError());
return NULL;
}
SDL_GPUShaderCreateInfo info = {
.code = code,
.code_size = code_size,
.entrypoint = "main",
.format = SDL_GPU_SHADERFORMAT_SPIRV,
.stage = stage,
.num_samplers = samplers,
.num_uniform_buffers = uniformbufs,
.num_storage_buffers = storagebufs,
.num_storage_textures = storagetextures
};
SDL_GPUShader *sh = SDL_CreateGPUShader(dev, &info);
if (!sh) {
fprintf(stderr, "failed to create shader: %s\n", SDL_GetError());
return NULL;
}
SDL_free(code);
return sh;
}
#define CHECK(t, msg) do { if (!(t)) { fprintf(stderr, "%s: %s\n", msg, SDL_GetError()); return SDL_APP_FAILURE; } } while(0)
SDL_AppResult SDL_AppInit(void **appstate, int argc, char **argv) {
(void)argc;
(void)argv;
(void)appstate;
/* TODO: support more than just SPIR-V */
win = SDL_CreateWindow("Hello, world!", 1024, 768, SDL_WINDOW_RESIZABLE | SDL_WINDOW_VULKAN);
CHECK(win, "failed to create window");
gpudev = SDL_CreateGPUDevice(SDL_GPU_SHADERFORMAT_SPIRV, 0, NULL);
CHECK(gpudev, "failed to create gpu device");
CHECK(SDL_ClaimWindowForGPUDevice(gpudev, win), "failed to claim window");
SDL_GPUShader *shader_vert = load_shader(gpudev, "shader/tri.vert.spv", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0, 0, 0);
CHECK(shader_vert, "load vertex shader");
SDL_GPUShader *shader_frag = load_shader(gpudev, "shader/tri.frag.spv", SDL_GPU_SHADERSTAGE_FRAGMENT, 0, 0, 0, 0);
CHECK(shader_frag, "load fragment shader");
SDL_GPUBufferCreateInfo buf_desc = {
.usage = SDL_GPU_BUFFERUSAGE_VERTEX,
.size = sizeof(vertices),
.props = 0
};
buf_vert = SDL_CreateGPUBuffer(gpudev, &buf_desc);
CHECK(buf_vert, "vertex buffer");
SDL_GPUTransferBufferCreateInfo buf_xfer_desc = {
.usage = SDL_GPU_TRANSFERBUFFERUSAGE_UPLOAD,
.size = sizeof(buf_vert),
.props = 0
};
buf_vert_xfer = SDL_CreateGPUTransferBuffer(gpudev, &buf_xfer_desc);
CHECK(buf_vert_xfer, "vertex transfer buffer");
void *map = SDL_MapGPUTransferBuffer(gpudev, buf_vert_xfer, false);
SDL_memcpy(map, vertices, sizeof(vertices));
SDL_UnmapGPUTransferBuffer(gpudev, buf_vert_xfer);
SDL_GPUCommandBuffer *cmdbuf = SDL_AcquireGPUCommandBuffer(gpudev);
CHECK(cmdbuf, "gpu command buffer acquisition");
SDL_GPUCopyPass *copypass = SDL_BeginGPUCopyPass(cmdbuf);
CHECK(copypass, "gpu copy pass");
SDL_GPUTransferBufferLocation src = {
.transfer_buffer = buf_vert_xfer,
.offset = 0
};
SDL_GPUBufferRegion dest = {
.buffer = buf_vert,
.offset = 0,
.size = sizeof(vertices)
};
SDL_UploadToGPUBuffer(copypass, &src, &dest, false);
SDL_EndGPUCopyPass(copypass);
SDL_SubmitGPUCommandBuffer(cmdbuf);
SDL_ReleaseGPUTransferBuffer(gpudev, buf_vert_xfer);
SDL_GPUGraphicsPipelineCreateInfo pipeline_info = {
.target_info = {
.num_color_targets = 1,
.color_target_descriptions = (SDL_GPUColorTargetDescription[]) {{
.format = SDL_GetGPUSwapchainTextureFormat(gpudev, win)
}},
},
.primitive_type = SDL_GPU_PRIMITIVETYPE_TRIANGLELIST,
.vertex_shader = shader_vert,
.fragment_shader = shader_frag,
.vertex_input_state = {
.num_vertex_buffers = 1,
.vertex_buffer_descriptions = &(SDL_GPUVertexBufferDescription) {
.slot = 0,
.pitch = sizeof(float) * 2,
.input_rate = SDL_GPU_VERTEXINPUTRATE_VERTEX,
.instance_step_rate = 0,
},
.num_vertex_attributes = 1,
.vertex_attributes = (SDL_GPUVertexAttribute[]) {
{
.location = 0,
.buffer_slot = 0,
.format = SDL_GPU_VERTEXELEMENTFORMAT_FLOAT2,
.offset = 0
}
}
},
.props = 0
};
pipeline_info.rasterizer_state.fill_mode = SDL_GPU_FILLMODE_FILL;
pipeline_fill = SDL_CreateGPUGraphicsPipeline(gpudev, &pipeline_info);
CHECK(pipeline_fill, "graphics pipeline");
SDL_ReleaseGPUShader(gpudev, shader_frag);
SDL_ReleaseGPUShader(gpudev, shader_vert);
return SDL_APP_CONTINUE;
}
SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) {
(void)appstate;
switch (event->type) {
case SDL_EVENT_QUIT:
puts("Quit!");
return SDL_APP_SUCCESS;
default:
break;
}
return SDL_APP_CONTINUE;
}
SDL_AppResult SDL_AppIterate(void *appstate) {
(void)appstate;
SDL_GPUCommandBuffer *cmdbuf = SDL_AcquireGPUCommandBuffer(gpudev);
if (!cmdbuf) {
fprintf(stderr, "failed to acquire GPU command buffer: %s\n", SDL_GetError());
return SDL_APP_FAILURE;
}
SDL_GPUTexture *swapchain;
if (!SDL_WaitAndAcquireGPUSwapchainTexture(cmdbuf, win, &swapchain, NULL, NULL)) {
fprintf(stderr, "failed to acquire swapchain texture: %s\n", SDL_GetError());
return SDL_APP_FAILURE;
}
if (!swapchain) {
fprintf(stderr, "null swapchain texture: %s\n", SDL_GetError());
SDL_SubmitGPUCommandBuffer(cmdbuf);
return SDL_APP_FAILURE;
}
SDL_GPUColorTargetInfo color_target_info = { 0 };
color_target_info.texture = swapchain;
color_target_info.clear_color = (SDL_FColor) { 0, 0, 0, 1 };
color_target_info.load_op = SDL_GPU_LOADOP_CLEAR;
color_target_info.store_op = SDL_GPU_STOREOP_STORE;
SDL_GPURenderPass *render_pass = SDL_BeginGPURenderPass(cmdbuf, &color_target_info, 1, NULL);
SDL_BindGPUGraphicsPipeline(render_pass, pipeline_fill);
SDL_BindGPUVertexBuffers(render_pass, 0, &(SDL_GPUBufferBinding) { .buffer = buf_vert, .offset = 0 }, 1);
SDL_DrawGPUPrimitives(render_pass, sizeof(vertices) / (sizeof(float)*2), 1, 0, 0);
SDL_EndGPURenderPass(render_pass);
SDL_SubmitGPUCommandBuffer(cmdbuf);
return SDL_APP_CONTINUE;
}
void SDL_AppQuit(void *appstate, SDL_AppResult result) {
(void)appstate;
(void)result;
SDL_ReleaseGPUGraphicsPipeline(gpudev, pipeline_fill);
SDL_ReleaseWindowFromGPUDevice(gpudev, win);
SDL_DestroyGPUDevice(gpudev);
SDL_DestroyWindow(win);
}
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