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cogl: Add an internal CoglTextureRectangle backend

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This adds an internal rectangle texture backend which is mostly based
on the CoglTexture2D backend. It will throw assert failures if any
operations are attempted that rectangle textures don't support, such
as mipmapping or hardware repeating.
This commit is contained in:
Neil Roberts
2010-06-10 15:33:34 +01:00
parent 82e63a4753
commit 9a1aa08fda
5 changed files with 764 additions and 18 deletions
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7
cogl/driver/gl/cogl-feature-functions.h
View File

@@ -312,6 +312,13 @@ COGL_FEATURE_FUNCTION (void, glDeleteBuffers,
const GLuint *buffers))
COGL_FEATURE_END ()
COGL_FEATURE_BEGIN (texture_rectangle, 255, 255,
"ARB\0",
"texture_rectangle\0",
COGL_FEATURE_TEXTURE_RECTANGLE,
0)
COGL_FEATURE_END ()
/* Cogl requires OpenGL 1.2 so we assume these functions are always
available and don't bother setting any feature flags. We still have
to fetch the function pointers though because under Windows you can

43
cogl/driver/gl/cogl-texture-driver.c
View File

@@ -70,6 +70,11 @@ _cogl_texture_driver_gen (GLenum gl_target,
GE( glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR) );
break;
case GL_TEXTURE_RECTANGLE_ARB:
/* Texture rectangles already default to GL_LINEAR so nothing
needs to be done */
break;
default:
g_assert_not_reached();
}
@@ -201,26 +206,28 @@ _cogl_texture_driver_size_supported (GLenum gl_target,
int width,
int height)
{
if (gl_target == GL_TEXTURE_2D)
{
/* Proxy texture allows for a quick check for supported size */
GLenum proxy_target;
GLint new_width = 0;
GLint new_width = 0;
GE( glTexImage2D (GL_PROXY_TEXTURE_2D, 0, GL_RGBA,
width, height, 0 /* border */,
gl_format, gl_type, NULL) );
GE( glGetTexLevelParameteriv (GL_PROXY_TEXTURE_2D, 0,
GL_TEXTURE_WIDTH, &new_width) );
return new_width != 0;
}
if (gl_target == GL_TEXTURE_2D)
proxy_target = GL_PROXY_TEXTURE_2D;
#if HAVE_COGL_GL
else if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
proxy_target = GL_PROXY_TEXTURE_RECTANGLE_ARB;
#endif
else
{
/* not used */
return 0;
}
/* Unknown target, assume it's not supported */
return FALSE;
/* Proxy texture allows for a quick check for supported size */
GE( glTexImage2D (proxy_target, 0, GL_RGBA,
width, height, 0 /* border */,
gl_format, gl_type, NULL) );
GE( glGetTexLevelParameteriv (proxy_target, 0,
GL_TEXTURE_WIDTH, &new_width) );
return new_width != 0;
}
void