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Support MIN/MAX blend on OpenGL + ES

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ds-sloth 2023-01-22 12:27:52 -05:00 committed by Sam Lantinga
parent ea179abdb7
commit 9670f233cc
2 changed files with 18 additions and 0 deletions
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4
src/render/opengl/SDL_render_gl.c
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@ -375,6 +375,10 @@ static GLenum GetBlendEquation(SDL_BlendOperation operation)
return GL_FUNC_SUBTRACT; return GL_FUNC_SUBTRACT;
case SDL_BLENDOPERATION_REV_SUBTRACT: case SDL_BLENDOPERATION_REV_SUBTRACT:
return GL_FUNC_REVERSE_SUBTRACT; return GL_FUNC_REVERSE_SUBTRACT;
case SDL_BLENDOPERATION_MINIMUM:
return GL_MIN;
case SDL_BLENDOPERATION_MAXIMUM:
return GL_MAX;
default: default:
return GL_INVALID_ENUM; return GL_INVALID_ENUM;
} }

14
src/render/opengles/SDL_render_gles.c
View file

@ -97,6 +97,7 @@ typedef struct
SDL_bool GL_OES_blend_func_separate_supported; SDL_bool GL_OES_blend_func_separate_supported;
SDL_bool GL_OES_blend_equation_separate_supported; SDL_bool GL_OES_blend_equation_separate_supported;
SDL_bool GL_OES_blend_subtract_supported; SDL_bool GL_OES_blend_subtract_supported;
SDL_bool GL_EXT_blend_minmax_supported;
GLES_DrawStateCache drawstate; GLES_DrawStateCache drawstate;
} GLES_RenderData; } GLES_RenderData;
@ -263,6 +264,10 @@ static GLenum GetBlendEquation(SDL_BlendOperation operation)
return GL_FUNC_SUBTRACT_OES; return GL_FUNC_SUBTRACT_OES;
case SDL_BLENDOPERATION_REV_SUBTRACT: case SDL_BLENDOPERATION_REV_SUBTRACT:
return GL_FUNC_REVERSE_SUBTRACT_OES; return GL_FUNC_REVERSE_SUBTRACT_OES;
case SDL_BLENDOPERATION_MINIMUM:
return GL_MIN_EXT;
case SDL_BLENDOPERATION_MAXIMUM:
return GL_MAX_EXT;
default: default:
return GL_INVALID_ENUM; return GL_INVALID_ENUM;
} }
@ -295,6 +300,12 @@ static SDL_bool GLES_SupportsBlendMode(SDL_Renderer *renderer, SDL_BlendMode ble
if (colorOperation != SDL_BLENDOPERATION_ADD && !data->GL_OES_blend_subtract_supported) { if (colorOperation != SDL_BLENDOPERATION_ADD && !data->GL_OES_blend_subtract_supported) {
return SDL_FALSE; return SDL_FALSE;
} }
if (colorOperation == SDL_BLENDOPERATION_MINIMUM && !data->GL_EXT_blend_minmax_supported) {
return SDL_FALSE;
}
if (colorOperation == SDL_BLENDOPERATION_MAXIMUM && !data->GL_EXT_blend_minmax_supported) {
return SDL_FALSE;
}
return SDL_TRUE; return SDL_TRUE;
} }
@ -1161,6 +1172,9 @@ static SDL_Renderer *GLES_CreateRenderer(SDL_Window *window, Uint32 flags)
if (SDL_GL_ExtensionSupported("GL_OES_blend_subtract")) { if (SDL_GL_ExtensionSupported("GL_OES_blend_subtract")) {
data->GL_OES_blend_subtract_supported = SDL_TRUE; data->GL_OES_blend_subtract_supported = SDL_TRUE;
} }
if (SDL_GL_ExtensionSupported("GL_EXT_blend_minmax")) {
data->GL_EXT_blend_minmax_supported = SDL_TRUE;
}
/* Set up parameters for rendering */ /* Set up parameters for rendering */
data->glDisable(GL_DEPTH_TEST); data->glDisable(GL_DEPTH_TEST);