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[SDL2] Implement SDL_GL_GetAttribute for SDL_GL_FLOATBUFFERS

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This commit is contained in:
Boris I. Bendovsky
2025-07-27 16:18:07 +03:00
committed by Sam Lantinga
parent b36252b120
commit 3c36718348
4 changed files with 23 additions and 1 deletions
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1
src/video/SDL_sysvideo.h
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@@ -399,6 +399,7 @@ struct SDL_VideoDevice
int no_error;
int retained_backing;
int driver_loaded;
int HAS_GL_ARB_color_buffer_float;
char driver_path[256];
void *dll_handle;
} gl_config;

13
src/video/SDL_video.c
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@@ -70,6 +70,10 @@
#include <dlfcn.h>
#endif
#ifndef GL_RGBA_FLOAT_MODE_ARB
#define GL_RGBA_FLOAT_MODE_ARB 0x8820
#endif /* GL_RGBA_FLOAT_MODE_ARB */
/* Available video drivers */
static VideoBootStrap *bootstrap[] = {
#ifdef SDL_VIDEO_DRIVER_COCOA
@@ -4036,6 +4040,15 @@ int SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
*value = _this->gl_config.no_error;
return 0;
}
case SDL_GL_FLOATBUFFERS:
{
if (_this->gl_config.HAS_GL_ARB_color_buffer_float) {
attrib = GL_RGBA_FLOAT_MODE_ARB;
break;
} else {
return 0;
}
}
default:
return SDL_SetError("Unknown OpenGL attribute");
}

9
src/video/windows/SDL_windowsopengl.c
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@@ -511,6 +511,10 @@ void WIN_GL_InitExtensions(_THIS)
_this->gl_data->HAS_WGL_ARB_create_context_no_error = SDL_TRUE;
}
/* Check for WGL_ARB_pixel_format_float */
_this->gl_data->HAS_WGL_ARB_pixel_format_float =
HasExtension("WGL_ARB_pixel_format_float", extensions);
_this->gl_data->wglMakeCurrent(hdc, NULL);
_this->gl_data->wglDeleteContext(hglrc);
ReleaseDC(hwnd, hdc);
@@ -641,7 +645,7 @@ static int WIN_GL_SetupWindowInternal(_THIS, SDL_Window *window)
*iAttr++ = _this->gl_config.multisamplesamples;
}
if (_this->gl_config.floatbuffers) {
if (_this->gl_data->HAS_WGL_ARB_pixel_format_float && _this->gl_config.floatbuffers) {
*iAttr++ = WGL_PIXEL_TYPE_ARB;
*iAttr++ = WGL_TYPE_RGBA_FLOAT_ARB;
}
@@ -825,6 +829,9 @@ SDL_GLContext WIN_GL_CreateContext(_THIS, SDL_Window *window)
return NULL;
}
_this->gl_config.HAS_GL_ARB_color_buffer_float =
SDL_GL_ExtensionSupported("GL_ARB_color_buffer_float");
return context;
}

1
src/video/windows/SDL_windowsopengl.h
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@@ -64,6 +64,7 @@ struct SDL_GLDriverData
SDL_bool HAS_WGL_ARB_context_flush_control;
SDL_bool HAS_WGL_ARB_create_context_robustness;
SDL_bool HAS_WGL_ARB_create_context_no_error;
SDL_bool HAS_WGL_ARB_pixel_format_float;
/* Max version of OpenGL ES context that can be created if the
implementation supports WGL_EXT_create_context_es2_profile.