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Added GPU_BLEND_NORMAL_ADD_ALPHA blend mode (paint-style).
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SDL_gpu/GL_common/SDL_gpu_GL_common.inl
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SDL_gpu/GL_common/SDL_gpu_GL_common.inl
···
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return;
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glBlendEquation(GL_FUNC_ADD);
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}
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else if(mode == GPU_BLEND_KEEP_ALPHA)
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else if(mode == GPU_BLEND_NORMAL_KEEP_ALPHA)
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{
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if(!(renderer->enabled_features & GPU_FEATURE_BLEND_FUNC_SEPARATE))
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return;
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// Don't disturb the alpha
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glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);
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if(!(renderer->enabled_features & GPU_FEATURE_BLEND_EQUATIONS))
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return;
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glBlendEquation(GL_FUNC_ADD);
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}
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else if(mode == GPU_BLEND_NORMAL_ADD_ALPHA)
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{
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if(!(renderer->enabled_features & GPU_FEATURE_BLEND_FUNC_SEPARATE))
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return;
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glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
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if(!(renderer->enabled_features & GPU_FEATURE_BLEND_EQUATIONS))
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return;
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glBlendEquation(GL_FUNC_ADD);
···
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// Delete the attached target first
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if(image->target != NULL)
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{
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renderer->FreeTarget(renderer, image->target);
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GPU_Target* target = image->target;
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image->target = NULL;
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renderer->FreeTarget(renderer, target);
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}
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flushAndClearBlitBufferIfCurrentTexture(renderer, image);
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SDL_gpu/SDL_gpu.h
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SDL_gpu/SDL_gpu.h
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GPU_BLEND_MOD_ALPHA = 12,
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GPU_BLEND_SET_ALPHA = 13,
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GPU_BLEND_SET = 14,
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GPU_BLEND_KEEP_ALPHA = 15,
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GPU_BLEND_NORMAL_KEEP_ALPHA = 15,
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GPU_BLEND_NORMAL_ADD_ALPHA = 16,
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GPU_BLEND_OVERRIDE = 100 // Lets you specify direct GL calls before blitting. Note: You should call GPU_FlushBlitBuffer() before you change blend modes via OpenGL so the new blend mode doesn't affect SDL_gpu's previously buffered blits.
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} GPU_BlendEnum;
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