/**
* Validate a renderbuffer attachment for a particular set of bindings.
*/
static GLboolean
st_validate_attachment(struct gl_context *ctx,
struct pipe_screen *screen,
const struct gl_renderbuffer_attachment *att,
unsigned bindings)
{
const struct st_texture_object *stObj = st_texture_object(att->Texture);
enum pipe_format format;
gl_format texFormat;
GLboolean valid;
/* Only validate texture attachments for now, since
* st_renderbuffer_alloc_storage makes sure that
* the format is supported.
*/
if (att->Type != GL_TEXTURE)
return GL_TRUE;
if (!stObj)
return GL_FALSE;
format = stObj->pt->format;
texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;
/* If the encoding is sRGB and sRGB rendering cannot be enabled,
* check for linear format support instead.
* Later when we create a surface, we change the format to a linear one. */
if (!ctx->Extensions.EXT_framebuffer_sRGB &&
_mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
format = st_mesa_format_to_pipe_format(linearFormat);
}
valid = screen->is_format_supported(screen, format,
PIPE_TEXTURE_2D,
stObj->pt->nr_samples, bindings);
if (!valid) {
st_fbo_invalid("Invalid format");
}
return valid;
}
/**
* Check that the framebuffer configuration is valid in terms of what
* the driver can support.
*
* For Gallium we only supports combined Z+stencil, not separate buffers.
*/
static void
st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
{
struct st_context *st = st_context(ctx);
struct pipe_screen *screen = st->pipe->screen;
const struct gl_renderbuffer_attachment *depth =
&fb->Attachment[BUFFER_DEPTH];
const struct gl_renderbuffer_attachment *stencil =
&fb->Attachment[BUFFER_STENCIL];
GLuint i;
enum pipe_format first_format = PIPE_FORMAT_NONE;
boolean mixed_formats =
screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
st_fbo_invalid("Different Depth/Stencil buffer formats");
fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
return;
}
if (depth->Type == GL_RENDERBUFFER_EXT &&
stencil->Type == GL_RENDERBUFFER_EXT &&
depth->Renderbuffer != stencil->Renderbuffer) {
st_fbo_invalid("Separate Depth/Stencil buffers");
fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
return;
}
if (depth->Type == GL_TEXTURE &&
stencil->Type == GL_TEXTURE &&
depth->Texture != stencil->Texture) {
fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
st_fbo_invalid("Different Depth/Stencil textures");
return;
}
if (!st_validate_attachment(ctx,
screen,
depth,
PIPE_BIND_DEPTH_STENCIL)) {
fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
return;
}
if (!st_validate_attachment(ctx,
screen,
stencil,
PIPE_BIND_DEPTH_STENCIL)) {
fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
return;
}
for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
struct gl_renderbuffer_attachment *att =
&fb->Attachment[BUFFER_COLOR0 + i];
enum pipe_format format;
if (!st_validate_attachment(ctx,
screen,
att,
PIPE_BIND_RENDER_TARGET)) {
fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
return;
}
if (!mixed_formats) {
/* Disallow mixed formats. */
if (att->Type != GL_NONE) {
format = st_renderbuffer(att->Renderbuffer)->surface->format;
} else {
continue;
}
if (first_format == PIPE_FORMAT_NONE) {
first_format = format;
} else if (format != first_format) {
fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
st_fbo_invalid("Mixed color formats");
return;
}
}
}
}
