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Implemented more flexible blending modes for accelerated renderers

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This fixes bug 2594 - Propose new blend mode, SDL_BLENDMODE_BLEND_DSTA

	blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_SRC_ALPHA,
	                                       SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
	                                       SDL_BLENDOPERATION_ADD,
	                                       SDL_BLENDFACTOR_ZERO,
	                                       SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDOPERATION_ADD);

This fixes bug 2828 - Subtractive Blending

	blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_SRC_ALPHA,
	                                       SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDOPERATION_SUBTRACT,
	                                       SDL_BLENDFACTOR_ZERO,
	                                       SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDOPERATION_SUBTRACT);


This goes partway to fixing bug 3684 - Add support for a pre-multiplied alpha blending mode

	blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
	                                       SDL_BLENDOPERATION_ADD,
	                                       SDL_BLENDFACTOR_ONE,
	                                       SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
	                                       SDL_BLENDOPERATION_ADD);
This commit is contained in:
Sam Lantinga
2017-08-14 05:51:44 -07:00
parent f8e1874d01
commit c59d9923b3
16 changed files with 718 additions and 778 deletions
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3
src/render/opengl/SDL_glfuncs.h
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@@ -35,7 +35,8 @@ SDL_PROC(void, glBindTexture, (GLenum, GLuint))
SDL_PROC_UNUSED(void, glBitmap,
(GLsizei, GLsizei, GLfloat, GLfloat, GLfloat, GLfloat,
const GLubyte *))
SDL_PROC(void, glBlendFunc, (GLenum, GLenum))
SDL_PROC(void, glBlendEquation, (GLenum))
SDL_PROC_UNUSED(void, glBlendFunc, (GLenum, GLenum))
SDL_PROC(void, glBlendFuncSeparate, (GLenum, GLenum, GLenum, GLenum))
SDL_PROC_UNUSED(void, glCallList, (GLuint))
SDL_PROC_UNUSED(void, glCallLists, (GLsizei, GLenum, const GLvoid *))