Commit 41c095bf authored by Chia-I Wu's avatar Chia-I Wu

st/mesa: Add support for surfaceless current contexts.

A surfaceless current context is a context that is made current without
draw and read framebuffers.  Such contexts can only render to FBOs.
parent c5279fd7
......@@ -42,6 +42,7 @@
#include "main/texstate.h"
#include "main/texfetch.h"
#include "main/framebuffer.h"
#include "main/fbobject.h"
#include "main/renderbuffer.h"
#include "st_texture.h"
......@@ -247,6 +248,9 @@ st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
int samples;
boolean sw;
if (!stfb->iface)
return FALSE;
/* do not distinguish depth/stencil buffers */
if (idx == BUFFER_STENCIL)
idx = BUFFER_DEPTH;
......@@ -299,6 +303,10 @@ st_visual_to_context_mode(const struct st_visual *visual,
{
memset(mode, 0, sizeof(*mode));
/* FBO-only context */
if (!visual)
return;
if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
mode->doubleBufferMode = GL_TRUE;
if (st_visual_have_buffers(visual,
......@@ -422,6 +430,15 @@ st_framebuffer_create(struct st_framebuffer_iface *stfbi)
if (!stfb)
return NULL;
/* for FBO-only context */
if (!stfbi) {
GLframebuffer *base = _mesa_get_incomplete_framebuffer();
stfb->Base = *base;
return stfb;
}
st_visual_to_context_mode(stfbi->visual, &mode);
_mesa_initialize_window_framebuffer(&stfb->Base, &mode);
......@@ -693,10 +710,14 @@ st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
st_framebuffer_validate(stread, st);
/* modify the draw/read buffers of the context */
st_visual_to_default_buffer(stdraw->iface->visual,
&st->ctx->Color.DrawBuffer[0], NULL);
st_visual_to_default_buffer(stread->iface->visual,
&st->ctx->Pixel.ReadBuffer, NULL);
if (stdraw->iface) {
st_visual_to_default_buffer(stdraw->iface->visual,
&st->ctx->Color.DrawBuffer[0], NULL);
}
if (stread->iface) {
st_visual_to_default_buffer(stread->iface->visual,
&st->ctx->Pixel.ReadBuffer, NULL);
}
ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
}
......@@ -748,6 +769,8 @@ st_manager_flush_frontbuffer(struct st_context *st)
if (!strb)
return;
/* never a dummy fb */
assert(stfb->iface);
stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
}
......
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