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mesa: avoid extraneous _NEW_BUFFER state in _mesa_drawbuffers()

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This commit is contained in:
Brian Paul 2009-11-02 14:41:17 -07:00
parent b28c637382
commit 8df699b3bb
1 changed files with 29 additions and 9 deletions
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38
src/mesa/main/buffers.c
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@ -362,6 +362,7 @@ _mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
{
struct gl_framebuffer *fb = ctx->DrawBuffer;
GLbitfield mask[MAX_DRAW_BUFFERS];
GLboolean newState = GL_FALSE;
if (!destMask) {
/* compute destMask values now */
@ -382,35 +383,50 @@ _mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
if (n == 1) {
GLuint count = 0, destMask0 = destMask[0];
/* init to -1 to help catch errors */
fb->_ColorDrawBufferIndexes[0] = -1;
//fb->_ColorDrawBufferIndexes[0] = -1;
while (destMask0) {
GLint bufIndex = _mesa_ffs(destMask0) - 1;
fb->_ColorDrawBufferIndexes[count] = bufIndex;
if (fb->_ColorDrawBufferIndexes[count] != bufIndex) {
fb->_ColorDrawBufferIndexes[count] = bufIndex;
newState = GL_TRUE;
}
count++;
destMask0 &= ~(1 << bufIndex);
}
fb->ColorDrawBuffer[0] = buffers[0];
fb->_NumColorDrawBuffers = count;
if (fb->_NumColorDrawBuffers != count) {
fb->_NumColorDrawBuffers = count;
newState = GL_TRUE;
}
}
else {
GLuint buf, count = 0;
for (buf = 0; buf < n; buf++ ) {
if (destMask[buf]) {
GLint bufIndex = _mesa_ffs(destMask[buf]) - 1;
/* only one bit should be set in the destMask[buf] field */
ASSERT(_mesa_bitcount(destMask[buf]) == 1);
fb->_ColorDrawBufferIndexes[buf] = _mesa_ffs(destMask[buf]) - 1;
if (fb->_ColorDrawBufferIndexes[buf] != bufIndex) {
fb->_ColorDrawBufferIndexes[buf] = bufIndex;
newState = GL_TRUE;
}
fb->ColorDrawBuffer[buf] = buffers[buf];
count = buf + 1;
}
else {
fb->_ColorDrawBufferIndexes[buf] = -1;
if (fb->_ColorDrawBufferIndexes[buf] != -1) {
fb->_ColorDrawBufferIndexes[buf] = -1;
newState = GL_TRUE;
}
}
}
/* set remaining outputs to -1 (GL_NONE) */
while (buf < ctx->Const.MaxDrawBuffers) {
fb->_ColorDrawBufferIndexes[buf] = -1;
if (fb->_ColorDrawBufferIndexes[buf] != -1) {
fb->_ColorDrawBufferIndexes[buf] = -1;
buf++;
}
fb->ColorDrawBuffer[buf] = GL_NONE;
buf++;
}
fb->_NumColorDrawBuffers = count;
}
@ -419,11 +435,15 @@ _mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
/* also set context drawbuffer state */
GLuint buf;
for (buf = 0; buf < ctx->Const.MaxDrawBuffers; buf++) {
ctx->Color.DrawBuffer[buf] = fb->ColorDrawBuffer[buf];
if (ctx->Color.DrawBuffer[buf] != fb->ColorDrawBuffer[buf]) {
ctx->Color.DrawBuffer[buf] = fb->ColorDrawBuffer[buf];
newState = GL_TRUE;
}
}
}
ctx->NewState |= _NEW_BUFFERS;
if (newState)
ctx->NewState |= _NEW_BUFFERS;
}