/**
* Update the context's current drawing buffer's Xmin, Xmax, Ymin, Ymax fields.
* These values are computed from the buffer's width and height and
* the scissor box, if it's enabled.
* \param ctx the GL context.
*/
void
_mesa_update_draw_buffer_bounds(struct gl_context *ctx)
{
struct gl_framebuffer *buffer = ctx->DrawBuffer;
if (!buffer)
return;
if (_mesa_is_user_fbo(buffer)) {
/* user-created framebuffer size depends on the renderbuffers */
update_framebuffer_size(ctx, buffer);
}
buffer->_Xmin = 0;
buffer->_Ymin = 0;
buffer->_Xmax = buffer->Width;
buffer->_Ymax = buffer->Height;
if (ctx->Scissor.Enabled) {
if (ctx->Scissor.X > buffer->_Xmin) {
buffer->_Xmin = ctx->Scissor.X;
}
if (ctx->Scissor.Y > buffer->_Ymin) {
buffer->_Ymin = ctx->Scissor.Y;
}
if (ctx->Scissor.X + ctx->Scissor.Width < buffer->_Xmax) {
buffer->_Xmax = ctx->Scissor.X + ctx->Scissor.Width;
}
if (ctx->Scissor.Y + ctx->Scissor.Height < buffer->_Ymax) {
buffer->_Ymax = ctx->Scissor.Y + ctx->Scissor.Height;
}
/* finally, check for empty region */
if (buffer->_Xmin > buffer->_Xmax) {
buffer->_Xmin = buffer->_Xmax;
}
if (buffer->_Ymin > buffer->_Ymax) {
buffer->_Ymin = buffer->_Ymax;
}
}
ASSERT(buffer->_Xmin <= buffer->_Xmax);
ASSERT(buffer->_Ymin <= buffer->_Ymax);
}
/**
* Update framebuffer state (color, depth, stencil, etc. buffers)
*/
void
st_update_framebuffer_state( struct st_context *st )
{
struct pipe_framebuffer_state framebuffer;
struct gl_framebuffer *fb = st->ctx->DrawBuffer;
struct st_renderbuffer *strb;
GLuint i;
st_flush_bitmap_cache(st);
st_invalidate_readpix_cache(st);
st->state.fb_orientation = st_fb_orientation(fb);
/**
* Quantize the derived default number of samples:
*
* A query to the driver of supported MSAA values the
* hardware supports is done as to legalize the number
* of application requested samples, NumSamples.
* See commit eb9cf3c for more information.
*/
fb->DefaultGeometry._NumSamples =
framebuffer_quantize_num_samples(st, fb->DefaultGeometry.NumSamples);
framebuffer.width = _mesa_geometric_width(fb);
framebuffer.height = _mesa_geometric_height(fb);
framebuffer.samples = _mesa_geometric_samples(fb);
framebuffer.layers = _mesa_geometric_layers(fb);
/* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
* to determine which surfaces to draw to
*/
framebuffer.nr_cbufs = fb->_NumColorDrawBuffers;
for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
framebuffer.cbufs[i] = NULL;
strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
if (strb) {
if (strb->is_rtt || (strb->texture &&
_mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB)) {
/* rendering to a GL texture, may have to update surface */
st_update_renderbuffer_surface(st, strb);
}
if (strb->surface) {
framebuffer.cbufs[i] = strb->surface;
update_framebuffer_size(&framebuffer, strb->surface);
}
strb->defined = GL_TRUE; /* we'll be drawing something */
}
}
for (i = framebuffer.nr_cbufs; i < PIPE_MAX_COLOR_BUFS; i++) {
framebuffer.cbufs[i] = NULL;
}
/* Remove trailing GL_NONE draw buffers. */
while (framebuffer.nr_cbufs &&
!framebuffer.cbufs[framebuffer.nr_cbufs-1]) {
framebuffer.nr_cbufs--;
}
/*
* Depth/Stencil renderbuffer/surface.
*/
strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
if (!strb)
strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
if (strb) {
if (strb->is_rtt) {
/* rendering to a GL texture, may have to update surface */
st_update_renderbuffer_surface(st, strb);
}
framebuffer.zsbuf = strb->surface;
update_framebuffer_size(&framebuffer, strb->surface);
}
else
framebuffer.zsbuf = NULL;
#ifdef DEBUG
/* Make sure the resource binding flags were set properly */
for (i = 0; i < framebuffer.nr_cbufs; i++) {
assert(!framebuffer.cbufs[i] ||
framebuffer.cbufs[i]->texture->bind & PIPE_BIND_RENDER_TARGET);
}
if (framebuffer.zsbuf) {
assert(framebuffer.zsbuf->texture->bind & PIPE_BIND_DEPTH_STENCIL);
}
#endif
if (framebuffer.width == USHRT_MAX)
framebuffer.width = 0;
if (framebuffer.height == USHRT_MAX)
framebuffer.height = 0;
cso_set_framebuffer(st->cso_context, &framebuffer);
st->state.fb_width = framebuffer.width;
st->state.fb_height = framebuffer.height;
st->state.fb_num_samples = util_framebuffer_get_num_samples(&framebuffer);
st->state.fb_num_layers = util_framebuffer_get_num_layers(&framebuffer);
st->state.fb_num_cb = framebuffer.nr_cbufs;
}