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Added hardware accelerated support for palettized textures

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Supported backends: direct3d, direct3d11, direct3d12, gpu, metal, opengl, opengles2
This commit is contained in:
Sam Lantinga
2025-09-27 22:55:21 -07:00
parent b82b1f416f
commit e2fe23ddab
51 changed files with 21216 additions and 15037 deletions
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84
src/render/gpu/SDL_render_gpu.c
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@@ -89,6 +89,7 @@ typedef struct GPU_RenderData
typedef struct GPU_TextureData
{
SDL_GPUTexture *texture;
SDL_GPUTexture *palette;
SDL_GPUTextureFormat format;
GPU_FragmentShaderID shader;
void *pixels;
@@ -124,8 +125,11 @@ static bool GPU_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture, SDL_
SDL_GPUTextureFormat format;
SDL_GPUTextureUsageFlags usage = SDL_GPU_TEXTUREUSAGE_SAMPLER;
format = SDL_GetGPUTextureFormatFromPixelFormat(texture->format);
if (texture->format == SDL_PIXELFORMAT_INDEX8) {
format = SDL_GPU_TEXTUREFORMAT_R8_UNORM;
} else {
format = SDL_GetGPUTextureFormatFromPixelFormat(texture->format);
}
if (format == SDL_GPU_TEXTUREFORMAT_INVALID) {
return SDL_SetError("Texture format %s not supported by SDL_GPU",
SDL_GetPixelFormatName(texture->format));
@@ -180,6 +184,16 @@ static bool GPU_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture, SDL_
return false;
}
if (texture->format == SDL_PIXELFORMAT_INDEX8) {
tci.format = SDL_GPU_TEXTUREFORMAT_R8G8B8A8_UNORM;
tci.width = 256;
tci.height = 1;
data->palette = SDL_CreateGPUTexture(renderdata->device, &tci);
if (!data->palette) {
return false;
}
}
SDL_PropertiesID props = SDL_GetTextureProperties(texture);
SDL_SetPointerProperty(props, SDL_PROP_TEXTURE_GPU_TEXTURE_POINTER, data->texture);
@@ -192,6 +206,52 @@ static bool GPU_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture, SDL_
return true;
}
static bool GPU_UpdateTexturePalette(SDL_Renderer *renderer, SDL_Texture *texture)
{
GPU_RenderData *renderdata = (GPU_RenderData *)renderer->internal;
GPU_TextureData *data = (GPU_TextureData *)texture->internal;
SDL_Palette *palette = texture->palette;
const Uint32 data_size = palette->ncolors * sizeof(*palette->colors);
SDL_GPUTransferBufferCreateInfo tbci;
SDL_zero(tbci);
tbci.size = data_size;
tbci.usage = SDL_GPU_TRANSFERBUFFERUSAGE_UPLOAD;
SDL_GPUTransferBuffer *tbuf = SDL_CreateGPUTransferBuffer(renderdata->device, &tbci);
if (tbuf == NULL) {
return false;
}
Uint8 *output = SDL_MapGPUTransferBuffer(renderdata->device, tbuf, false);
SDL_memcpy(output, palette->colors, data_size);
SDL_UnmapGPUTransferBuffer(renderdata->device, tbuf);
SDL_GPUCommandBuffer *cbuf = renderdata->state.command_buffer;
SDL_GPUCopyPass *cpass = SDL_BeginGPUCopyPass(cbuf);
SDL_GPUTextureTransferInfo tex_src;
SDL_zero(tex_src);
tex_src.transfer_buffer = tbuf;
tex_src.rows_per_layer = 1;
tex_src.pixels_per_row = palette->ncolors;
SDL_GPUTextureRegion tex_dst;
SDL_zero(tex_dst);
tex_dst.texture = data->palette;
tex_dst.x = 0;
tex_dst.y = 0;
tex_dst.w = palette->ncolors;
tex_dst.h = 1;
tex_dst.d = 1;
SDL_UploadToGPUTexture(cpass, &tex_src, &tex_dst, false);
SDL_EndGPUCopyPass(cpass);
SDL_ReleaseGPUTransferBuffer(renderdata->device, tbuf);
return true;
}
static bool GPU_UpdateTexture(SDL_Renderer *renderer, SDL_Texture *texture,
const SDL_Rect *rect, const void *pixels, int pitch)
{
@@ -539,7 +599,13 @@ static void Draw(
SDL_Texture *texture = cmd->data.draw.texture;
if (texture) {
v_shader = VERT_SHADER_TRI_TEXTURE;
if (texture->format == SDL_PIXELFORMAT_RGBA32 || texture->format == SDL_PIXELFORMAT_BGRA32) {
if (texture->format == SDL_PIXELFORMAT_INDEX8) {
if (cmd->data.draw.texture_scale_mode == SDL_SCALEMODE_PIXELART) {
f_shader = FRAG_SHADER_TEXTURE_PALETTE_PIXELART;
} else {
f_shader = FRAG_SHADER_TEXTURE_PALETTE;
}
} else if (texture->format == SDL_PIXELFORMAT_RGBA32 || texture->format == SDL_PIXELFORMAT_BGRA32) {
if (cmd->data.draw.texture_scale_mode == SDL_SCALEMODE_PIXELART) {
f_shader = FRAG_SHADER_TEXTURE_RGBA_PIXELART;
} else {
@@ -589,12 +655,19 @@ static void Draw(
Uint32 sampler_slot = 0;
if (cmd->data.draw.texture) {
GPU_TextureData *tdata = (GPU_TextureData *)cmd->data.draw.texture->internal;
SDL_Texture *texture = cmd->data.draw.texture;
GPU_TextureData *tdata = (GPU_TextureData *)texture->internal;
SDL_GPUTextureSamplerBinding sampler_bind;
SDL_zero(sampler_bind);
sampler_bind.sampler = GetSampler(data, cmd->data.draw.texture_scale_mode, cmd->data.draw.texture_address_mode_u, cmd->data.draw.texture_address_mode_v);
sampler_bind.texture = tdata->texture;
SDL_BindGPUFragmentSamplers(pass, sampler_slot++, &sampler_bind, 1);
if (texture->format == SDL_PIXELFORMAT_INDEX8) {
sampler_bind.sampler = GetSampler(data, SDL_SCALEMODE_NEAREST, SDL_TEXTURE_ADDRESS_CLAMP, SDL_TEXTURE_ADDRESS_CLAMP);
sampler_bind.texture = tdata->palette;
SDL_BindGPUFragmentSamplers(pass, sampler_slot++, &sampler_bind, 1);
}
}
if (custom_state) {
if (custom_state->num_sampler_bindings > 0) {
@@ -1055,6 +1128,7 @@ static void GPU_DestroyTexture(SDL_Renderer *renderer, SDL_Texture *texture)
}
SDL_ReleaseGPUTexture(renderdata->device, data->texture);
SDL_ReleaseGPUTexture(renderdata->device, data->palette);
SDL_free(data->pixels);
SDL_free(data);
texture->internal = NULL;
@@ -1169,6 +1243,7 @@ static bool GPU_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, SDL_P
renderer->SupportsBlendMode = GPU_SupportsBlendMode;
renderer->CreateTexture = GPU_CreateTexture;
renderer->UpdateTexturePalette = GPU_UpdateTexturePalette;
renderer->UpdateTexture = GPU_UpdateTexture;
renderer->LockTexture = GPU_LockTexture;
renderer->UnlockTexture = GPU_UnlockTexture;
@@ -1256,6 +1331,7 @@ static bool GPU_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, SDL_P
SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_RGBA32);
SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_BGRX32);
SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_RGBX32);
SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_INDEX8);
SDL_SetNumberProperty(SDL_GetRendererProperties(renderer), SDL_PROP_RENDERER_MAX_TEXTURE_SIZE_NUMBER, 16384);