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Textures with alpha format default to SDL_BLENDMODE_BLEND 

Fixes https://github.com/libsdl-org/SDL/issues/9941
This commit is contained in:
Sam Lantinga 2024-07-16 18:00:20 -07:00
parent 2db57e2678
commit 7c0307060d
3 changed files with 9 additions and 0 deletions
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2
docs/README-migration.md
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@ -1265,6 +1265,8 @@ SDL_CreateWindowAndRenderer() now takes the window title as the first parameter.
SDL_GetRendererInfo() has been removed. The name of a renderer can be retrieved using SDL_GetRendererName(), and the other information is available as properties on the renderer. SDL_GetRendererInfo() has been removed. The name of a renderer can be retrieved using SDL_GetRendererName(), and the other information is available as properties on the renderer.
Textures are created with SDL_SCALEMODE_LINEAR by default, and use SDL_BLENDMODE_BLEND by default if they are created with a format that has an alpha channel.
SDL_QueryTexture() has been removed. The properties of the texture can be queried using SDL_PROP_TEXTURE_FORMAT_NUMBER, SDL_PROP_TEXTURE_ACCESS_NUMBER, SDL_PROP_TEXTURE_WIDTH_NUMBER, and SDL_PROP_TEXTURE_HEIGHT_NUMBER. A function SDL_GetTextureSize() has been added to get the size of the texture as floating point values. SDL_QueryTexture() has been removed. The properties of the texture can be queried using SDL_PROP_TEXTURE_FORMAT_NUMBER, SDL_PROP_TEXTURE_ACCESS_NUMBER, SDL_PROP_TEXTURE_WIDTH_NUMBER, and SDL_PROP_TEXTURE_HEIGHT_NUMBER. A function SDL_GetTextureSize() has been added to get the size of the texture as floating point values.
Mouse and touch events are no longer filtered to change their coordinates, instead you Mouse and touch events are no longer filtered to change their coordinates, instead you

1
src/render/SDL_render.c
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@ -1355,6 +1355,7 @@ SDL_Texture *SDL_CreateTextureWithProperties(SDL_Renderer *renderer, SDL_Propert
texture->color.g = 1.0f; texture->color.g = 1.0f;
texture->color.b = 1.0f; texture->color.b = 1.0f;
texture->color.a = 1.0f; texture->color.a = 1.0f;
texture->blendMode = SDL_ISPIXELFORMAT_ALPHA(format) ? SDL_BLENDMODE_BLEND : SDL_BLENDMODE_NONE;
texture->scaleMode = SDL_SCALEMODE_LINEAR; texture->scaleMode = SDL_SCALEMODE_LINEAR;
texture->view.pixel_w = w; texture->view.pixel_w = w;
texture->view.pixel_h = h; texture->view.pixel_h = h;

6
test/testautomation_render.c
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@ -401,6 +401,12 @@ static void testBlendModeOperation(TestRenderOperation op, int mode, SDL_PixelFo
if (dst == NULL) { if (dst == NULL) {
return; return;
} }
if (SDL_ISPIXELFORMAT_ALPHA(dst_format)) {
SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
ret = SDL_GetTextureBlendMode(dst, &blendMode);
SDLTest_AssertCheck(ret == 0, "Verify result from SDL_GetTextureBlendMode(), expected: 0, got: %i", ret);
SDLTest_AssertCheck(blendMode == SDL_BLENDMODE_BLEND, "Verify alpha texture blend mode, expected %d, got %" SDL_PRIu32, SDL_BLENDMODE_BLEND, blendMode);
}
/* Set as render target */ /* Set as render target */
SDL_SetRenderTarget(renderer, dst); SDL_SetRenderTarget(renderer, dst);