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mesa: new cases in _mesa_base_fbo_format()

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The set of internalFormat parameters accepted by glRenderBufferStorage
depends on the EXT vs. ARB version of framebuffer_object.  The later
added support for GL_ALPHA, GL_LUMINANCE, etc. formats.  Note that
these formats might be legal but might not be supported.  That should
be checked with glCheckFramebufferStatus().
This commit is contained in:
Brian Paul
2011-01-24 19:38:52 -07:00
parent f41bbc7c44
commit 976ea9d76b
1 changed files with 35 additions and 8 deletions
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43
src/mesa/main/fbobject.c
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@@ -961,26 +961,53 @@ _mesa_GenRenderbuffersEXT(GLsizei n, GLuint *renderbuffers)
/**
* Given an internal format token for a render buffer, return the
* corresponding base format.
* This is very similar to _mesa_base_tex_format() but the set of valid
* internal formats is somewhat different.
* corresponding base format (one of GL_RGB, GL_RGBA, GL_STENCIL_INDEX,
* GL_DEPTH_COMPONENT, GL_DEPTH_STENCIL_EXT, GL_ALPHA, GL_LUMINANCE,
* GL_LUMINANCE_ALPHA, GL_INTENSITY, etc).
*
* \return one of GL_RGB, GL_RGBA, GL_STENCIL_INDEX, GL_DEPTH_COMPONENT
* GL_DEPTH_STENCIL_EXT or zero if error.
* This is similar to _mesa_base_tex_format() but the set of valid
* internal formats is different.
*
* XXX in the future when we support red-only and red-green formats
* we'll also return GL_RED and GL_RG.
* Note that even if a format is determined to be legal here, validation
* of the FBO may fail if the format is not suppoted by the driver/GPU.
*
* \param internalFormat as passed to glRenderbufferStorage()
* \return the base internal format, or 0 if internalFormat is illegal
*/
GLenum
_mesa_base_fbo_format(struct gl_context *ctx, GLenum internalFormat)
{
/*
* Notes: some formats such as alpha, luminance, etc. were added
* with GL_ARB_framebuffer_object.
*/
switch (internalFormat) {
case GL_ALPHA:
case GL_ALPHA4:
case GL_ALPHA8:
case GL_ALPHA12:
case GL_ALPHA16:
return GL_ALPHA;
return ctx->Extensions.ARB_framebuffer_object ? GL_ALPHA : 0;
case GL_LUMINANCE:
case GL_LUMINANCE4:
case GL_LUMINANCE8:
case GL_LUMINANCE12:
case GL_LUMINANCE16:
return ctx->Extensions.ARB_framebuffer_object ? GL_LUMINANCE : 0;
case GL_LUMINANCE_ALPHA:
case GL_LUMINANCE4_ALPHA4:
case GL_LUMINANCE6_ALPHA2:
case GL_LUMINANCE8_ALPHA8:
case GL_LUMINANCE12_ALPHA4:
case GL_LUMINANCE12_ALPHA12:
case GL_LUMINANCE16_ALPHA16:
return ctx->Extensions.ARB_framebuffer_object ? GL_LUMINANCE_ALPHA : 0;
case GL_INTENSITY:
case GL_INTENSITY4:
case GL_INTENSITY8:
case GL_INTENSITY12:
case GL_INTENSITY16:
return ctx->Extensions.ARB_framebuffer_object ? GL_INTENSITY : 0;
case GL_RGB:
case GL_R3_G3_B2:
case GL_RGB4: