Basically, in update_framebuffer() (which should be called after an FBO is bound
with MakeCurrent or BindFramebuffer) we check if the FBO is a window-system FBO.
If it is, update the FBO's GL_READ/DRAW_BUFFER state according to the context state.
Old code still in place but disabled with #if 0 / #endif.
* \sa _mesa_DrawBuffersARB
*
* \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc.
+ *
+ * Note that the behaviour of this function depends on whether the
+ * current ctx->DrawBuffer is a window-system framebuffer (Name=0) or
+ * a user-created framebuffer object (Name!=0).
+ * In the former case, we update the per-context ctx->Color.DrawBuffer
+ * state var _and_ the FB's ColorDrawBuffer state.
+ * In the later case, we update the FB's ColorDrawBuffer state only.
+ *
+ * Furthermore, upon a MakeCurrent() or BindFramebuffer() call, if the
+ * new FB is a window system FB, we need to re-update the FB's
+ * ColorDrawBuffer state to match the context. This is handled in
+ * _mesa_update_framebuffer().
+ *
+ * See the GL_EXT_framebuffer_object spec for more info.
*/
void GLAPIENTRY
_mesa_DrawBuffer(GLenum buffer)
/**
- * Helper routine used by _mesa_DrawBuffer, _mesa_DrawBuffersARB and
- * other places (window fbo fixup) to set fbo (and the old ctx) fields.
+ * Helper function to set the GL_DRAW_BUFFER state in the context and
+ * current FBO.
+ *
* All error checking will have been done prior to calling this function
* so nothing should go wrong at this point.
+ *
* \param ctx current context
* \param n number of color outputs to set
* \param buffers array[n] of colorbuffer names, like GL_LEFT.
}
+#if 0
GLboolean
_mesa_readbuffer_update_fields(GLcontext *ctx, GLenum buffer)
{
}
if (fb->Name == 0) {
+ /* Only update the per-context GL_READ_BUFFER state if we're bound to
+ * a window-system framebuffer.
+ */
ctx->Pixel.ReadBuffer = buffer;
}
+
+ /* Set the FBO's GL_READ_BUFFER state */
fb->ColorReadBuffer = buffer;
fb->_ColorReadBufferIndex = srcBuffer;
return GL_TRUE;
}
+#endif
+
+
+/**
+ * Like \sa _mesa_drawbuffers(), this is a helper function for setting
+ * GL_READ_BUFFER state in the context and current FBO.
+ * \param ctx the rendering context
+ * \param buffer GL_FRONT, GL_BACK, GL_COLOR_ATTACHMENT0, etc.
+ * \param bufferIndex the numerical index corresponding to 'buffer'
+ */
+void
+_mesa_readbuffer(GLcontext *ctx, GLenum buffer, GLint bufferIndex)
+{
+ struct gl_framebuffer *fb = ctx->ReadBuffer;
+
+ if (fb->Name == 0) {
+ /* Only update the per-context READ_BUFFER state if we're bound to
+ * a window-system framebuffer.
+ */
+ ctx->Pixel.ReadBuffer = buffer;
+ }
+
+ fb->ColorReadBuffer = buffer;
+ fb->_ColorReadBufferIndex = bufferIndex;
+
+ ctx->NewState |= _NEW_PIXEL;
+}
void GLAPIENTRY
_mesa_ReadBuffer(GLenum buffer)
{
+ struct gl_framebuffer *fb;
+ GLbitfield supportedMask;
+ GLint srcBuffer;
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
- if (!_mesa_readbuffer_update_fields(ctx, buffer))
- return;
+ fb = ctx->ReadBuffer;
- ctx->NewState |= _NEW_PIXEL;
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
+
+ if (fb->Name > 0 && buffer == GL_NONE) {
+ /* This is legal for user-created framebuffer objects */
+ srcBuffer = -1;
+ }
+ else {
+ /* general case / window-system framebuffer */
+ srcBuffer = read_buffer_enum_to_index(buffer);
+ if (srcBuffer == -1) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glReadBuffer(buffer=0x%x)", buffer);
+ return;
+ }
+ supportedMask = supported_buffer_bitmask(ctx, fb);
+ if (((1 << srcBuffer) & supportedMask) == 0) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glReadBuffer(buffer=0x%x)", buffer);
+ return;
+ }
+ }
+
+ /* OK, all error checking has been completed now */
+
+ _mesa_readbuffer(ctx, buffer, srcBuffer);
/*
* Call device driver function.
/*
* Mesa 3-D graphics library
- * Version: 6.5
+ * Version: 7.1
*
- * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
_mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
const GLbitfield *destMask);
+extern void
+_mesa_readbuffer(GLcontext *ctx, GLenum buffer, GLint bufferIndex);
+
+#if 0
extern GLboolean
_mesa_readbuffer_update_fields(GLcontext *ctx, GLenum buffer);
+#endif
extern void GLAPIENTRY
_mesa_ReadBuffer( GLenum mode );
*/
if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
_mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
+#if 000
/* fix up the fb fields - these will end up wrong otherwise
if the DRIdrawable changes, and everything relies on them.
This is a bit messy (same as needed in _mesa_BindFramebufferEXT) */
buffers[i] = newCtx->Color.DrawBuffer[i];
}
_mesa_drawbuffers(newCtx, newCtx->Const.MaxDrawBuffers, buffers, NULL);
+#endif
}
if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
_mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
+#if 00
_mesa_readbuffer_update_fields(newCtx, newCtx->Pixel.ReadBuffer);
+#endif
}
+ /* XXX only set this flag if we're really changing the draw/read
+ * framebuffer bindings.
+ */
newCtx->NewState |= _NEW_BUFFERS;
#if 1
}
FLUSH_VERTICES(ctx, _NEW_BUFFERS);
+
if (ctx->Driver.Flush) {
ctx->Driver.Flush(ctx);
}
+
if (framebuffer) {
/* Binding a user-created framebuffer object */
newFb = _mesa_lookup_framebuffer(ctx, framebuffer);
* XXX check if re-binding same buffer and skip some of this code.
*/
+#if 000
/* for window-framebuffers, re-initialize the fbo values, as they
could be wrong (makecurrent with a new drawable while still a fbo
was bound will lead to default init fbo values).
note that therefore the context ReadBuffer/DrawBuffer values are not
valid while fbo's are bound!!! */
+#endif
if (bindReadBuf) {
_mesa_reference_framebuffer(&ctx->ReadBuffer, newFbread);
+#if 000
if (!newFbread->Name) {
_mesa_readbuffer_update_fields(ctx, ctx->Pixel.ReadBuffer);
}
+#endif
}
if (bindDrawBuf) {
/* check if old FB had any texture attachments */
check_end_texture_render(ctx, ctx->DrawBuffer);
+
/* check if time to delete this framebuffer */
_mesa_reference_framebuffer(&ctx->DrawBuffer, newFb);
- if (!newFb->Name) {
+
+ if (newFb->Name != 0) {
+ /* check if newly bound framebuffer has any texture attachments */
+ check_begin_texture_render(ctx, newFb);
+ }
+ else {
+ /* XXX try to remove this: */
+#if 000
GLuint i;
GLenum buffers[MAX_DRAW_BUFFERS];
for(i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
buffers[i] = ctx->Color.DrawBuffer[i];
}
_mesa_drawbuffers(ctx, ctx->Const.MaxDrawBuffers, buffers, NULL);
- }
- else {
- /* check if newly bound framebuffer has any texture attachments */
- check_begin_texture_render(ctx, newFb);
+#endif
}
}
#include "glheader.h"
#include "imports.h"
+#include "buffers.h"
#include "context.h"
#include "depthstencil.h"
#include "mtypes.h"
/**
- * Update the list of color drawing renderbuffer pointers.
+ * Update the (derived) list of color drawing renderbuffer pointers.
* Later, when we're rendering we'll loop from 0 to _NumColorDrawBuffers
* writing colors.
*/
/**
- * Update the color read renderbuffer pointer.
+ * Update the (derived) color read renderbuffer pointer.
* Unlike the DrawBuffer, we can only read from one (or zero) color buffers.
*/
static void
static void
update_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
{
- /* Completeness only matters for user-created framebuffers */
- if (fb->Name != 0) {
- /* XXX: EXT_framebuffer_blit:
- framebuffer must still be complete wrt read/draw? */
+ if (fb->Name == 0) {
+ /* This is a window-system framebuffer */
+ /* Need to update the FB's GL_DRAW_BUFFER state to match the
+ * context state (GL_READ_BUFFER too).
+ */
+ if (fb->ColorDrawBuffer[0] != ctx->Color.DrawBuffer[0]) {
+ _mesa_drawbuffers(ctx, ctx->Const.MaxDrawBuffers,
+ ctx->Color.DrawBuffer, NULL);
+ }
+ if (fb->ColorReadBuffer != ctx->Pixel.ReadBuffer) {
+
+ }
+ }
+ else {
+ /* This is a user-created framebuffer.
+ * Completeness only matters for user-created framebuffers.
+ */
_mesa_test_framebuffer_completeness(ctx, fb);
_mesa_update_framebuffer_visual(fb);
}
projects / mesa.git / commitdiff