/*
* Mesa 3-D graphics library
- * Version: 6.5.1
+ * Version: 7.2
*
- * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2008 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"),
#include "glheader.h"
#include "imports.h"
+#include "buffers.h"
#include "context.h"
#include "depthstencil.h"
+#include "macros.h"
#include "mtypes.h"
#include "fbobject.h"
#include "framebuffer.h"
#include "renderbuffer.h"
+#include "texobj.h"
if (fb) {
fb->Name = name;
fb->RefCount = 1;
+ fb->_NumColorDrawBuffers = 1;
fb->ColorDrawBuffer[0] = GL_COLOR_ATTACHMENT0_EXT;
- fb->_ColorDrawBufferMask[0] = BUFFER_BIT_COLOR0;
+ fb->_ColorDrawBufferIndexes[0] = BUFFER_COLOR0;
fb->ColorReadBuffer = GL_COLOR_ATTACHMENT0_EXT;
fb->_ColorReadBufferIndex = BUFFER_COLOR0;
fb->Delete = _mesa_destroy_framebuffer;
+ _glthread_INIT_MUTEX(fb->Mutex);
}
return fb;
}
/* save the visual */
fb->Visual = *visual;
- /* Init glRead/DrawBuffer state */
+ /* Init read/draw renderbuffer state */
if (visual->doubleBufferMode) {
+ fb->_NumColorDrawBuffers = 1;
fb->ColorDrawBuffer[0] = GL_BACK;
- fb->_ColorDrawBufferMask[0] = BUFFER_BIT_BACK_LEFT;
+ fb->_ColorDrawBufferIndexes[0] = BUFFER_BACK_LEFT;
fb->ColorReadBuffer = GL_BACK;
fb->_ColorReadBufferIndex = BUFFER_BACK_LEFT;
}
else {
+ fb->_NumColorDrawBuffers = 1;
fb->ColorDrawBuffer[0] = GL_FRONT;
- fb->_ColorDrawBufferMask[0] = BUFFER_BIT_FRONT_LEFT;
+ fb->_ColorDrawBufferIndexes[0] = BUFFER_FRONT_LEFT;
fb->ColorReadBuffer = GL_FRONT;
fb->_ColorReadBufferIndex = BUFFER_FRONT_LEFT;
}
_mesa_reference_renderbuffer(&att->Renderbuffer, NULL);
}
if (att->Texture) {
- /* render to texture */
- att->Texture->RefCount--;
- if (att->Texture->RefCount == 0) {
- GET_CURRENT_CONTEXT(ctx);
- if (ctx) {
- ctx->Driver.DeleteTexture(ctx, att->Texture);
- }
- }
+ _mesa_reference_texobj(&att->Texture, NULL);
}
+ ASSERT(!att->Renderbuffer);
+ ASSERT(!att->Texture);
att->Type = GL_NONE;
- att->Texture = NULL;
}
/* unbind _Depth/_StencilBuffer to decr ref counts */
/* no change */
return;
}
- if (*ptr) {
- _mesa_unreference_framebuffer(ptr);
- }
- assert(!*ptr);
- assert(fb);
- _glthread_LOCK_MUTEX(fb->Mutex);
- fb->RefCount++;
- _glthread_UNLOCK_MUTEX(fb->Mutex);
- *ptr = fb;
-}
-
-/**
- * Undo/remove a reference to a framebuffer object.
- * Decrement the framebuffer object's reference count and delete it when
- * the refcount hits zero.
- * Note: we pass the address of a pointer and set it to NULL.
- */
-void
-_mesa_unreference_framebuffer(struct gl_framebuffer **fb)
-{
- assert(fb);
- if (*fb) {
+ if (*ptr) {
+ /* unreference old renderbuffer */
GLboolean deleteFlag = GL_FALSE;
+ struct gl_framebuffer *oldFb = *ptr;
- _glthread_LOCK_MUTEX((*fb)->Mutex);
- ASSERT((*fb)->RefCount > 0);
- (*fb)->RefCount--;
- deleteFlag = ((*fb)->RefCount == 0);
- _glthread_UNLOCK_MUTEX((*fb)->Mutex);
+ _glthread_LOCK_MUTEX(oldFb->Mutex);
+ ASSERT(oldFb->RefCount > 0);
+ oldFb->RefCount--;
+ deleteFlag = (oldFb->RefCount == 0);
+ _glthread_UNLOCK_MUTEX(oldFb->Mutex);
if (deleteFlag)
- (*fb)->Delete(*fb);
+ oldFb->Delete(oldFb);
- *fb = NULL;
+ *ptr = NULL;
}
-}
-
+ assert(!*ptr);
+ if (fb) {
+ _glthread_LOCK_MUTEX(fb->Mutex);
+ fb->RefCount++;
+ _glthread_UNLOCK_MUTEX(fb->Mutex);
+ *ptr = fb;
+ }
+}
/**
/**
* Examine all the framebuffer's renderbuffers to update the Width/Height
* fields of the framebuffer. If we have renderbuffers with different
- * sizes, set the framebuffer's width and height to zero.
+ * sizes, set the framebuffer's width and height to the min size.
* Note: this is only intended for user-created framebuffers, not
* window-system framebuffes.
*/
static void
-update_framebuffer_size(struct gl_framebuffer *fb)
+update_framebuffer_size(GLcontext *ctx, struct gl_framebuffer *fb)
{
- GLboolean haveSize = GL_FALSE;
+ GLuint minWidth = ~0, minHeight = ~0;
GLuint i;
/* user-created framebuffers only */
struct gl_renderbuffer_attachment *att = &fb->Attachment[i];
const struct gl_renderbuffer *rb = att->Renderbuffer;
if (rb) {
- if (haveSize) {
- if (rb->Width != fb->Width && rb->Height != fb->Height) {
- /* size mismatch! */
- fb->Width = 0;
- fb->Height = 0;
- return;
- }
- }
- else {
- fb->Width = rb->Width;
- fb->Height = rb->Height;
- haveSize = GL_TRUE;
- }
+ minWidth = MIN2(minWidth, rb->Width);
+ minHeight = MIN2(minHeight, rb->Height);
}
}
+
+ if (minWidth != ~0) {
+ fb->Width = minWidth;
+ fb->Height = minHeight;
+ }
+ else {
+ fb->Width = 0;
+ fb->Height = 0;
+ }
}
if (buffer->Name) {
/* user-created framebuffer size depends on the renderbuffers */
- update_framebuffer_size(buffer);
+ update_framebuffer_size(ctx, buffer);
}
buffer->_Xmin = 0;
fb->Visual.rgbBits = fb->Visual.redBits
+ fb->Visual.greenBits + fb->Visual.blueBits;
fb->Visual.floatMode = GL_FALSE;
+ fb->Visual.samples = rb->NumSamples;
break;
}
else if (rb->_BaseFormat == GL_COLOR_INDEX) {
if (fb->Attachment[BUFFER_ACCUM].Renderbuffer) {
fb->Visual.haveAccumBuffer = GL_TRUE;
fb->Visual.accumRedBits
- = fb->Attachment[BUFFER_DEPTH].Renderbuffer->RedBits;
+ = fb->Attachment[BUFFER_ACCUM].Renderbuffer->RedBits;
fb->Visual.accumGreenBits
- = fb->Attachment[BUFFER_DEPTH].Renderbuffer->GreenBits;
+ = fb->Attachment[BUFFER_ACCUM].Renderbuffer->GreenBits;
fb->Visual.accumBlueBits
- = fb->Attachment[BUFFER_DEPTH].Renderbuffer->BlueBits;
+ = fb->Attachment[BUFFER_ACCUM].Renderbuffer->BlueBits;
fb->Visual.accumAlphaBits
- = fb->Attachment[BUFFER_DEPTH].Renderbuffer->AlphaBits;
+ = fb->Attachment[BUFFER_ACCUM].Renderbuffer->AlphaBits;
}
compute_depth_max(fb);
}
+/*
+ * Example DrawBuffers scenarios:
+ *
+ * 1. glDrawBuffer(GL_FRONT_AND_BACK), fixed-func or shader writes to
+ * "gl_FragColor" or program writes to the "result.color" register:
+ *
+ * fragment color output renderbuffer
+ * --------------------- ---------------
+ * color[0] Front, Back
+ *
+ *
+ * 2. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]), shader writes to
+ * gl_FragData[i] or program writes to result.color[i] registers:
+ *
+ * fragment color output renderbuffer
+ * --------------------- ---------------
+ * color[0] Front
+ * color[1] Aux0
+ * color[3] Aux1
+ *
+ *
+ * 3. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]) and shader writes to
+ * gl_FragColor, or fixed function:
+ *
+ * fragment color output renderbuffer
+ * --------------------- ---------------
+ * color[0] Front, Aux0, Aux1
+ *
+ *
+ * In either case, the list of renderbuffers is stored in the
+ * framebuffer->_ColorDrawBuffers[] array and
+ * framebuffer->_NumColorDrawBuffers indicates the number of buffers.
+ * The renderer (like swrast) has to look at the current fragment shader
+ * to see if it writes to gl_FragColor vs. gl_FragData[i] to determine
+ * how to map color outputs to renderbuffers.
+ *
+ * Note that these two calls are equivalent (for fixed function fragment
+ * shading anyway):
+ * a) glDrawBuffer(GL_FRONT_AND_BACK); (assuming non-stereo framebuffer)
+ * b) glDrawBuffers(2, [GL_FRONT_LEFT, GL_BACK_LEFT]);
+ */
+
+
+
+
/**
- * 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.
*/
{
GLuint output;
- /*
- * Fragment programs can write to multiple colorbuffers with
- * the GL_ARB_draw_buffers extension.
- */
- for (output = 0; output < ctx->Const.MaxDrawBuffers; output++) {
- GLbitfield bufferMask = fb->_ColorDrawBufferMask[output];
- GLuint count = 0;
- GLuint i;
- if (!fb->DeletePending) {
- /* We need the inner loop here because glDrawBuffer(GL_FRONT_AND_BACK)
- * can specify writing to two or four color buffers (for example).
- */
- for (i = 0; bufferMask && i < BUFFER_COUNT; i++) {
- const GLuint bufferBit = 1 << i;
- if (bufferBit & bufferMask) {
- struct gl_renderbuffer *rb = fb->Attachment[i].Renderbuffer;
- if (rb && rb->Width > 0 && rb->Height > 0) {
- fb->_ColorDrawBuffers[output][count] = rb;
- count++;
- }
- else {
- /*
- _mesa_warning(ctx, "DrawBuffer names a missing buffer!\n");
- */
- }
- bufferMask &= ~bufferBit;
- }
- }
+ /* set 0th buffer to NULL now in case _NumColorDrawBuffers is zero */
+ fb->_ColorDrawBuffers[0] = NULL;
+
+ for (output = 0; output < fb->_NumColorDrawBuffers; output++) {
+ GLint buf = fb->_ColorDrawBufferIndexes[output];
+ if (buf >= 0) {
+ fb->_ColorDrawBuffers[output] = fb->Attachment[buf].Renderbuffer;
+ }
+ else {
+ fb->_ColorDrawBuffers[output] = NULL;
}
- fb->_NumColorDrawBuffers[output] = count;
}
}
/**
- * 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
}
+/**
+ * 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)
{
- /* Completeness only matters for user-created framebuffers */
- if (fb->Name != 0) {
- /* XXX: EXT_framebuffer_blit:
- framebuffer must still be complete wrt read/draw? */
- _mesa_test_framebuffer_completeness(ctx, fb);
- _mesa_update_framebuffer_visual(fb);
+ 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.
+ */
+ if (fb->_Status != GL_FRAMEBUFFER_COMPLETE) {
+ _mesa_test_framebuffer_completeness(ctx, 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);
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);
}
/**
* Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels,
- * glCopyTex[Sub]Image, etc. exists.
+ * glCopyTex[Sub]Image, etc) exists.
* \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
* GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
* \return GL_TRUE if buffer exists, GL_FALSE otherwise
GLboolean
_mesa_source_buffer_exists(GLcontext *ctx, GLenum format)
{
- const struct gl_renderbuffer_attachment *att
- = ctx->ReadBuffer->Attachment;
+ const struct gl_renderbuffer_attachment *att = ctx->ReadBuffer->Attachment;
+
+ /* If we don't know the framebuffer status, update it now */
+ if (ctx->ReadBuffer->_Status == 0) {
+ _mesa_test_framebuffer_completeness(ctx, ctx->ReadBuffer);
+ }
if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
return GL_FALSE;
if (ctx->ReadBuffer->_ColorReadBuffer == NULL) {
return GL_FALSE;
}
- /* XXX enable this post 6.5 release:
ASSERT(ctx->ReadBuffer->_ColorReadBuffer->RedBits > 0 ||
ctx->ReadBuffer->_ColorReadBuffer->IndexBits > 0);
- */
break;
case GL_DEPTH:
case GL_DEPTH_COMPONENT:
/**
* As above, but for drawing operations.
- * XXX code do some code merging w/ above function.
+ * XXX could do some code merging w/ above function.
*/
GLboolean
_mesa_dest_buffer_exists(GLcontext *ctx, GLenum format)
{
- const struct gl_renderbuffer_attachment *att
- = ctx->ReadBuffer->Attachment;
+ const struct gl_renderbuffer_attachment *att = ctx->DrawBuffer->Attachment;
+
+ /* If we don't know the framebuffer status, update it now */
+ if (ctx->DrawBuffer->_Status == 0) {
+ _mesa_test_framebuffer_completeness(ctx, ctx->DrawBuffer);
+ }
if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
return GL_FALSE;
case GL_BGRA:
case GL_ABGR_EXT:
case GL_COLOR_INDEX:
- /* nothing special */
+ /* Nothing special since GL_DRAW_BUFFER could be GL_NONE. */
/* Could assert that colorbuffer has RedBits > 0 */
break;
case GL_DEPTH:
break;
default:
_mesa_problem(ctx,
- "Unexpected format 0x%x in _mesa_source_buffer_exists",
+ "Unexpected format 0x%x in _mesa_dest_buffer_exists",
format);
return GL_FALSE;
}
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