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mesa: use ffs() to shorten loop in _mesa_drawbuffers()

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This commit is contained in:
Brian Paul 2009-11-02 13:20:19 -07:00
parent 2d11c48223
commit b28c637382
1 changed files with 10 additions and 6 deletions
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16
src/mesa/main/buffers.c
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@ -375,15 +375,19 @@ _mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
destMask = mask;
}
/*
* If n==1, destMask[0] may have up to four bits set.
* Otherwise, destMask[x] can only have one bit set.
*/
if (n == 1) {
GLuint buf, count = 0;
GLuint count = 0, destMask0 = destMask[0];
/* init to -1 to help catch errors */
fb->_ColorDrawBufferIndexes[0] = -1;
for (buf = 0; buf < BUFFER_COUNT; buf++) {
if (destMask[0] & (1 << buf)) {
fb->_ColorDrawBufferIndexes[count] = buf;
count++;
}
while (destMask0) {
GLint bufIndex = _mesa_ffs(destMask0) - 1;
fb->_ColorDrawBufferIndexes[count] = bufIndex;
count++;
destMask0 &= ~(1 << bufIndex);
}
fb->ColorDrawBuffer[0] = buffers[0];
fb->_NumColorDrawBuffers = count;