static GLboolean
compatible_resolve_formats(const struct gl_renderbuffer *readRb,
const struct gl_renderbuffer *drawRb)
{
GLenum readFormat, drawFormat;
/* The simple case where we know the backing Mesa formats are the same.
*/
if (_mesa_get_srgb_format_linear(readRb->Format) ==
_mesa_get_srgb_format_linear(drawRb->Format)) {
return GL_TRUE;
}
/* The Mesa formats are different, so we must check whether the internal
* formats are compatible.
*
* Under some circumstances, the user may request e.g. two GL_RGBA8
* textures and get two entirely different Mesa formats like RGBA8888 and
* ARGB8888. Drivers behaving like that should be able to cope with
* non-matching formats by themselves, because it's not the user's fault.
*
* Blits between linear and sRGB formats are also allowed.
*/
readFormat = _mesa_get_nongeneric_internalformat(readRb->InternalFormat);
drawFormat = _mesa_get_nongeneric_internalformat(drawRb->InternalFormat);
readFormat = _mesa_get_linear_internalformat(readFormat);
drawFormat = _mesa_get_linear_internalformat(drawFormat);
if (readFormat == drawFormat) {
return GL_TRUE;
}
return GL_FALSE;
}
static GLboolean
compatible_resolve_formats(const struct gl_renderbuffer *readRb,
const struct gl_renderbuffer *drawRb)
{
GLenum readFormat, drawFormat;
/* This checks whether the internal formats are compatible rather than the
* Mesa format for two reasons:
*
* • Under some circumstances, the user may request e.g. two GL_RGBA8
* textures and get two entirely different Mesa formats like RGBA8888 and
* ARGB8888. Drivers behaving like that should be able to cope with
* non-matching formats by themselves, because it's not the user's fault.
*
* • Picking two different internal formats can end up with the same Mesa
* format. For example the driver might be simulating GL_RGB textures
* with GL_RGBA internally and in that case both internal formats would
* end up with RGBA8888.
*
* This function is used to generate a GL error according to the spec so in
* both cases we want to be looking at the application-level format, which
* is InternalFormat.
*
* Blits between linear and sRGB formats are also allowed.
*/
readFormat = _mesa_get_nongeneric_internalformat(readRb->InternalFormat);
drawFormat = _mesa_get_nongeneric_internalformat(drawRb->InternalFormat);
readFormat = _mesa_get_linear_internalformat(readFormat);
drawFormat = _mesa_get_linear_internalformat(drawFormat);
if (readFormat == drawFormat) {
return GL_TRUE;
}
return GL_FALSE;
}
