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Added a hint to control whether the OpenGL driver uses shaders.

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This commit is contained in:
Sam Lantinga 2011-02-08 22:40:19 -08:00
parent 752dd42dea
commit 9c86971ac9
2 changed files with 24 additions and 1 deletions
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15
include/SDL_hints.h
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@ -77,11 +77,26 @@ extern "C" {
* This variable is case insensitive and can be set to the following values: * This variable is case insensitive and can be set to the following values:
* "direct3d" * "direct3d"
* "opengl" * "opengl"
* "opengles2"
* "opengles" * "opengles"
* "software" * "software"
*
* The default varies by platform, but it's the first one in the list that
* is available on the current platform.
*/ */
#define SDL_HINT_RENDER_DRIVER "SDL_RENDER_DRIVER" #define SDL_HINT_RENDER_DRIVER "SDL_RENDER_DRIVER"
/**
* \brief A variable controlling whether the OpenGL render driver uses shaders if they are available.
*
* This variable can be set to the following values:
* "0" - Disable shaders
* "1" - Enable shaders
*
* By default shaders are used if OpenGL supports them.
*/
#define SDL_HINT_RENDER_OPENGL_SHADERS "SDL_RENDER_OPENGL_SHADERS"
/** /**
* \brief A variable controlling whether updates to the SDL 1.2 screen surface should be synchronized with the vertical refresh, to avoid tearing. * \brief A variable controlling whether updates to the SDL 1.2 screen surface should be synchronized with the vertical refresh, to avoid tearing.
* *

8
src/render/opengl/SDL_render_gl.c
View file

@ -23,6 +23,8 @@
#if SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED #if SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED
#include "SDL_hints.h"
#include "SDL_log.h"
#include "SDL_opengl.h" #include "SDL_opengl.h"
#include "../SDL_sysrender.h" #include "../SDL_sysrender.h"
#include "SDL_shaders_gl.h" #include "SDL_shaders_gl.h"
@ -183,6 +185,7 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
{ {
SDL_Renderer *renderer; SDL_Renderer *renderer;
GL_RenderData *data; GL_RenderData *data;
const char *hint;
GLint value; GLint value;
Uint32 window_flags; Uint32 window_flags;
@ -282,7 +285,12 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
} }
/* Check for shader support */ /* Check for shader support */
hint = SDL_GetHint(SDL_HINT_RENDER_OPENGL_SHADERS);
if (!hint || *hint != '0') {
data->shaders = GL_CreateShaderContext(); data->shaders = GL_CreateShaderContext();
}
SDL_LogInfo(SDL_LOG_CATEGORY_RENDER, "OpenGL shaders: %s",
data->shaders ? "ENABLED" : "DISABLED");
#if 0 #if 0
/* We support YV12 textures using 3 textures and a shader */ /* We support YV12 textures using 3 textures and a shader */