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Support MIN/MAX blend on opengles2

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ds-sloth 2023-01-22 17:16:13 -05:00 committed by Sam Lantinga
parent c0445c23bf
commit 038ccd764a
1 changed files with 20 additions and 0 deletions
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20
src/render/opengles2/SDL_render_gles2.c
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@ -149,6 +149,8 @@ typedef struct GLES2_RenderData
SDL_bool debug_enabled;
SDL_bool GL_EXT_blend_minmax_supported;
#define SDL_PROC(ret, func, params) ret(APIENTRY *func) params;
#include "SDL_gles2funcs.h"
#undef SDL_PROC
@ -355,6 +357,10 @@ static GLenum GetBlendEquation(SDL_BlendOperation operation)
return GL_FUNC_SUBTRACT;
case SDL_BLENDOPERATION_REV_SUBTRACT:
return GL_FUNC_REVERSE_SUBTRACT;
case SDL_BLENDOPERATION_MINIMUM:
return GL_MIN_EXT;
case SDL_BLENDOPERATION_MAXIMUM:
return GL_MAX_EXT;
default:
return GL_INVALID_ENUM;
}
@ -362,6 +368,8 @@ static GLenum GetBlendEquation(SDL_BlendOperation operation)
static SDL_bool GLES2_SupportsBlendMode(SDL_Renderer *renderer, SDL_BlendMode blendMode)
{
GLES2_RenderData *data = (GLES2_RenderData *)renderer->driverdata;
SDL_BlendFactor srcColorFactor = SDL_GetBlendModeSrcColorFactor(blendMode);
SDL_BlendFactor srcAlphaFactor = SDL_GetBlendModeSrcAlphaFactor(blendMode);
SDL_BlendOperation colorOperation = SDL_GetBlendModeColorOperation(blendMode);
@ -377,6 +385,14 @@ static SDL_bool GLES2_SupportsBlendMode(SDL_Renderer *renderer, SDL_BlendMode bl
GetBlendEquation(alphaOperation) == GL_INVALID_ENUM) {
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;
}
@ -2206,6 +2222,10 @@ static SDL_Renderer *GLES2_CreateRenderer(SDL_Window *window, Uint32 flags)
renderer->rect_index_order[4] = 3;
renderer->rect_index_order[5] = 2;
if (SDL_GL_ExtensionSupported("GL_EXT_blend_minmax")) {
data->GL_EXT_blend_minmax_supported = SDL_TRUE;
}
/* Set up parameters for rendering */
data->glActiveTexture(GL_TEXTURE0);
data->glPixelStorei(GL_PACK_ALIGNMENT, 1);