GLenum GetSizedFormat(const GLHookSet &gl, GLenum target, GLenum internalFormat)
{
switch(internalFormat)
{
case eGL_RED:
case eGL_RG:
case eGL_RGB:
case eGL_RGBA:
case eGL_DEPTH_COMPONENT:
case eGL_DEPTH_STENCIL:
break;
default:
return internalFormat; // already explicitly sized
}
switch(target)
{
case eGL_TEXTURE_CUBE_MAP_POSITIVE_X:
case eGL_TEXTURE_CUBE_MAP_NEGATIVE_X:
case eGL_TEXTURE_CUBE_MAP_POSITIVE_Y:
case eGL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
case eGL_TEXTURE_CUBE_MAP_POSITIVE_Z:
case eGL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
target = eGL_TEXTURE_CUBE_MAP;
default:
break;
}
GLint red, depth;
if(gl.glGetInternalformativ)
{
gl.glGetInternalformativ(target, internalFormat, eGL_INTERNALFORMAT_RED_SIZE, sizeof(GLint), &red);
gl.glGetInternalformativ(target, internalFormat, eGL_INTERNALFORMAT_DEPTH_SIZE, sizeof(GLint), &depth);
}
else
{
// without the query function, just default to sensible defaults
red = 8;
depth = 32;
}
switch(internalFormat)
{
case eGL_RED:
if(red == 32)
return eGL_R32F;
else if(red == 16)
return eGL_R16;
else
return eGL_R8;
case eGL_RG:
if(red == 32)
return eGL_RG32F;
else if(red == 16)
return eGL_RG16;
else
return eGL_RG8;
case eGL_RGB:
if(red == 32)
return eGL_RGB32F;
else if(red == 16)
return eGL_RGB16;
else
return eGL_RGB8;
case eGL_RGBA:
if(red == 32)
return eGL_RGBA32F;
else if(red == 16)
return eGL_RGBA16;
else
return eGL_RGBA8;
case eGL_DEPTH_COMPONENT:
if(depth == 32)
return eGL_DEPTH_COMPONENT32F;
else if(depth == 16)
return eGL_DEPTH_COMPONENT16;
else
return eGL_DEPTH_COMPONENT24;
case eGL_DEPTH_STENCIL:
if(depth == 32)
return eGL_DEPTH32F_STENCIL8;
else
return eGL_DEPTH24_STENCIL8;
default:
break;
}
return internalFormat;
}
GLenum GetSizedFormat(const GLHookSet &gl, GLenum target, GLenum internalFormat)
{
switch(internalFormat)
{
// pick sized format ourselves for generic formats
case eGL_COMPRESSED_RED: return eGL_COMPRESSED_RED_RGTC1;
case eGL_COMPRESSED_RG: return eGL_COMPRESSED_RG_RGTC2;
case eGL_COMPRESSED_RGB: return eGL_COMPRESSED_RGB_S3TC_DXT1_EXT;
case eGL_COMPRESSED_RGBA: return eGL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
case eGL_COMPRESSED_SRGB: return eGL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
case eGL_COMPRESSED_SRGB_ALPHA:
return eGL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
// only one sized format for SRGB
case eGL_SRGB: return eGL_SRGB8;
case eGL_SRGB_ALPHA: return eGL_SRGB8_ALPHA8;
case eGL_RED:
case eGL_RG:
case eGL_RGB:
case eGL_RGBA:
case eGL_DEPTH_COMPONENT:
case eGL_STENCIL:
case eGL_STENCIL_INDEX:
case eGL_DEPTH_STENCIL: break;
default:
return internalFormat; // already explicitly sized
}
switch(target)
{
case eGL_TEXTURE_CUBE_MAP_POSITIVE_X:
case eGL_TEXTURE_CUBE_MAP_NEGATIVE_X:
case eGL_TEXTURE_CUBE_MAP_POSITIVE_Y:
case eGL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
case eGL_TEXTURE_CUBE_MAP_POSITIVE_Z:
case eGL_TEXTURE_CUBE_MAP_NEGATIVE_Z: target = eGL_TEXTURE_CUBE_MAP;
default: break;
}
GLint red, depth, stencil;
if(gl.glGetInternalformativ)
{
gl.glGetInternalformativ(target, internalFormat, eGL_INTERNALFORMAT_RED_SIZE, sizeof(GLint),
&red);
gl.glGetInternalformativ(target, internalFormat, eGL_INTERNALFORMAT_DEPTH_SIZE, sizeof(GLint),
&depth);
gl.glGetInternalformativ(target, internalFormat, eGL_INTERNALFORMAT_STENCIL_SIZE, sizeof(GLint),
&stencil);
}
else
{
// without the query function, just default to sensible defaults
red = 8;
depth = 32;
stencil = 8;
}
switch(internalFormat)
{
case eGL_RED:
if(red == 32)
return eGL_R32F;
else if(red == 16)
return eGL_R16;
else
return eGL_R8;
case eGL_RG:
if(red == 32)
return eGL_RG32F;
else if(red == 16)
return eGL_RG16;
else
return eGL_RG8;
case eGL_RGB:
if(red == 32)
return eGL_RGB32F;
else if(red == 16)
return eGL_RGB16;
else
return eGL_RGB8;
case eGL_RGBA:
if(red == 32)
return eGL_RGBA32F;
else if(red == 16)
return eGL_RGBA16;
else
return eGL_RGBA8;
case eGL_STENCIL:
case eGL_STENCIL_INDEX:
if(stencil == 16)
return eGL_STENCIL_INDEX16;
else
return eGL_STENCIL_INDEX8;
case eGL_DEPTH_COMPONENT:
if(depth == 32)
return eGL_DEPTH_COMPONENT32F;
else if(depth == 16)
return eGL_DEPTH_COMPONENT16;
else
return eGL_DEPTH_COMPONENT24;
case eGL_DEPTH_STENCIL:
if(depth == 32)
return eGL_DEPTH32F_STENCIL8;
else
return eGL_DEPTH24_STENCIL8;
default: break;
}
return internalFormat;
}