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authorBrian Paul <brian.paul@tungstengraphics.com>2005-09-23 03:22:20 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2005-09-23 03:22:20 +0000
commit048b13df65f222b10564091df3dfa2b6cab77631 (patch)
tree8de05f15cce314be558ac6621a6c402482ebc170 /src/mesa/main/framebuffer.c
parentd5861c06f2b7c4039e410a30df828c9b43958566 (diff)
Replace gl_framebuffer's _ColorReadBufferMask with _ColorReadBufferIndex,
Streamline the _mesa_update_framebuffer() function a bit.
Diffstat (limited to 'src/mesa/main/framebuffer.c')
-rw-r--r--src/mesa/main/framebuffer.c49
1 files changed, 18 insertions, 31 deletions
diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index 4ad82c85ff..abfde18e3e 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -106,7 +106,7 @@ _mesa_new_framebuffer(GLcontext *ctx, GLuint name)
fb->ColorDrawBuffer[0] = GL_COLOR_ATTACHMENT0_EXT;
fb->_ColorDrawBufferMask[0] = BUFFER_BIT_COLOR0;
fb->ColorReadBuffer = GL_COLOR_ATTACHMENT0_EXT;
- fb->_ColorReadBufferMask = BUFFER_BIT_COLOR0;
+ fb->_ColorReadBufferIndex = BUFFER_COLOR0;
fb->Delete = _mesa_destroy_framebuffer;
}
return fb;
@@ -134,13 +134,13 @@ _mesa_initialize_framebuffer(struct gl_framebuffer *fb, const GLvisual *visual)
fb->ColorDrawBuffer[0] = GL_BACK;
fb->_ColorDrawBufferMask[0] = BUFFER_BIT_BACK_LEFT;
fb->ColorReadBuffer = GL_BACK;
- fb->_ColorReadBufferMask = BUFFER_BIT_BACK_LEFT;
+ fb->_ColorReadBufferIndex = BUFFER_BACK_LEFT;
}
else {
fb->ColorDrawBuffer[0] = GL_FRONT;
fb->_ColorDrawBufferMask[0] = BUFFER_BIT_FRONT_LEFT;
fb->ColorReadBuffer = GL_FRONT;
- fb->_ColorReadBufferMask = BUFFER_BIT_FRONT_LEFT;
+ fb->_ColorReadBufferIndex = BUFFER_FRONT_LEFT;
}
fb->Delete = _mesa_destroy_framebuffer;
@@ -358,24 +358,6 @@ _mesa_update_framebuffer_visual(struct gl_framebuffer *fb)
/**
- * Given a framebuffer and a buffer bit (like BUFFER_BIT_FRONT_LEFT), return
- * the corresponding renderbuffer.
- */
-static struct gl_renderbuffer *
-get_renderbuffer(struct gl_framebuffer *fb, GLbitfield bufferBit)
-{
- GLuint index;
- for (index = 0; index < BUFFER_COUNT; index++) {
- if ((1 << index) == bufferBit) {
- return fb->Attachment[index].Renderbuffer;
- }
- }
- _mesa_problem(NULL, "Bad bufferBit in get_renderbuffer");
- return NULL;
-}
-
-
-/**
* Update state related to the current draw/read framebuffers.
* Specifically, update these framebuffer fields:
* _ColorDrawBuffers
@@ -396,7 +378,7 @@ _mesa_update_framebuffer(GLcontext *ctx)
_mesa_test_framebuffer_completeness(ctx, fb);
/*
- * Update the list of drawing renderbuffer pointers.
+ * Update the list of color drawing renderbuffer pointers.
* Later, when we're rendering we'll loop from 0 to _NumColorDrawBuffers
* writing colors. We need the inner loop here because
* glDrawBuffer(GL_FRONT_AND_BACK) can specify writing to two or four
@@ -405,11 +387,11 @@ _mesa_update_framebuffer(GLcontext *ctx)
for (output = 0; output < ctx->Const.MaxDrawBuffers; output++) {
GLbitfield bufferMask = fb->_ColorDrawBufferMask[output];
GLuint count = 0;
- GLuint bufferBit;
- /* for each bit that's set in the bufferMask... */
- for (bufferBit = 1; bufferMask; bufferBit <<= 1) {
+ GLuint i;
+ for (i = 0; bufferMask && i < BUFFER_COUNT; i++) {
+ const GLuint bufferBit = 1 << i;
if (bufferBit & bufferMask) {
- struct gl_renderbuffer *rb = get_renderbuffer(fb, bufferBit);
+ struct gl_renderbuffer *rb = fb->Attachment[i].Renderbuffer;
if (rb) {
fb->_ColorDrawBuffers[output][count] = rb;
count++;
@@ -424,13 +406,18 @@ _mesa_update_framebuffer(GLcontext *ctx)
}
/*
- * Update the read renderbuffer pointer.
+ * Update the color read renderbuffer pointer.
* Unlike the DrawBuffer, we can only read from one (or zero) color buffers.
*/
- if (fb->_ColorReadBufferMask == 0x0)
+ if (fb->_ColorReadBufferIndex == -1) {
fb->_ColorReadBuffer = NULL; /* legal! */
- else
- fb->_ColorReadBuffer = get_renderbuffer(fb, fb->_ColorReadBufferMask);
-
+ }
+ else {
+ ASSERT(fb->_ColorReadBufferIndex >= 0);
+ ASSERT(fb->_ColorReadBufferIndex < BUFFER_COUNT);
+ fb->_ColorReadBuffer
+ = fb->Attachment[fb->_ColorReadBufferIndex].Renderbuffer;
+ printf("Read buffer index %d\n", fb->_ColorReadBufferIndex);
+ }
compute_depth_max(fb);
}