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update comments, etc related to Read/DrawBuffer state

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This commit is contained in:
Brian 2007-08-16 16:49:35 +01:00
parent c5a5d12743
commit c033ccc36d
2 changed files with 33 additions and 20 deletions
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7
src/mesa/main/buffers.c
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@ -479,9 +479,12 @@ set_color_output(GLcontext *ctx, GLuint output, GLenum buffer,
/* not really needed, will be set later */
fb->_NumColorDrawBuffers[output] = 0;
if (fb->Name == 0)
/* Set traditional state var */
if (fb->Name == 0) {
/* Only set the per-context DrawBuffer state if we're currently
* drawing to a window system framebuffer.
*/
ctx->Color.DrawBuffer[output] = buffer;
}
}

46
src/mesa/main/framebuffer.c
View file

@ -138,7 +138,7 @@ _mesa_initialize_framebuffer(struct gl_framebuffer *fb, const GLvisual *visual)
/* save the visual */
fb->Visual = *visual;
/* Init glRead/DrawBuffer state */
/* Init read/draw renderbuffer state */
if (visual->doubleBufferMode) {
fb->ColorDrawBuffer[0] = GL_BACK;
fb->_ColorDrawBufferMask[0] = BUFFER_BIT_BACK_LEFT;
@ -649,6 +649,22 @@ update_color_read_buffer(GLcontext *ctx, struct gl_framebuffer *fb)
}
/**
* Update a gl_framebuffer's derived state.
*
* Specifically, update these framebuffer fields:
* _ColorDrawBuffers
* _NumColorDrawBuffers
* _ColorReadBuffer
* _DepthBuffer
* _StencilBuffer
*
* If the framebuffer is user-created, make sure it's complete.
*
* The following functions (at least) can effect framebuffer state:
* glReadBuffer, glDrawBuffer, glDrawBuffersARB, glFramebufferRenderbufferEXT,
* glRenderbufferStorageEXT.
*/
static void
update_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
{
@ -660,8 +676,11 @@ update_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
_mesa_update_framebuffer_visual(fb);
}
/* update_color_draw/read_buffers not needed for
read/draw only fb, but shouldn't hurt ??? */
/* Strictly speaking, we don't need to update the draw-state
* if this FB is bound as ctx->ReadBuffer (and conversely, the
* read-state if this FB is bound as ctx->DrawBuffer), but no
* harm.
*/
update_color_draw_buffers(ctx, fb);
update_color_read_buffer(ctx, fb);
_mesa_update_depth_buffer(ctx, fb, BUFFER_DEPTH);
@ -670,28 +689,19 @@ update_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
compute_depth_max(fb);
}
/**
* Update state related to the current draw/read framebuffers.
* Specifically, update these framebuffer fields:
* _ColorDrawBuffers
* _NumColorDrawBuffers
* _ColorReadBuffer
* _DepthBuffer
* _StencilBuffer
* If the current framebuffer is user-created, make sure it's complete.
* The following functions can effect this state: glReadBuffer,
* glDrawBuffer, glDrawBuffersARB, glFramebufferRenderbufferEXT,
* glRenderbufferStorageEXT.
*/
void
_mesa_update_framebuffer(GLcontext *ctx)
{
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_framebuffer *fbread = ctx->ReadBuffer;
struct gl_framebuffer *drawFb = ctx->DrawBuffer;
struct gl_framebuffer *readFb = ctx->ReadBuffer;
update_framebuffer(ctx, fb);
if (fbread != fb)
update_framebuffer(ctx, fbread);
update_framebuffer(ctx, drawFb);
if (readFb != drawFb)
update_framebuffer(ctx, readFb);
}