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-rw-r--r--src/mesa/main/accum.c37
1 files changed, 19 insertions, 18 deletions
diff --git a/src/mesa/main/accum.c b/src/mesa/main/accum.c
index de660a84a6a..adca8ec2f42 100644
--- a/src/mesa/main/accum.c
+++ b/src/mesa/main/accum.c
@@ -1,4 +1,4 @@
-/* $Id: accum.c,v 1.7 1999/10/20 22:32:02 brianp Exp $ */
+/* $Id: accum.c,v 1.8 1999/10/20 22:39:16 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -342,16 +342,17 @@ void gl_Accum( GLcontext *ctx, GLenum op, GLfloat value )
rescale_accum(ctx);
if (ctx->IntegerAccumMode) {
- /* build lookup table to avoid integer divides */
- GLfloat divisor = 1.0F / ctx->IntegerAccumScaler;
- static GLubyte divTable[32768];
- static GLfloat prevDivisor = 0.0;
+ /* build lookup table to avoid many floating point multiplies */
+ const GLfloat mult = ctx->IntegerAccumScaler;
+ static GLchan multTable[32768];
+ static GLfloat prevMult = 0.0;
GLuint j;
- if (divisor != prevDivisor) {
- assert(divisor * 256 <= 32768);
- for (j = 0; j < divisor * 256; j++)
- divTable[j] = (GLint) ((GLfloat) j / divisor + 0.5F);
- prevDivisor = divisor;
+ const GLint max = 256 / mult;
+ if (mult != prevMult) {
+ assert(max <= 32768);
+ for (j = 0; j < max; j++)
+ multTable[j] = (GLint) ((GLfloat) j * mult + 0.5F);
+ prevMult = mult;
}
assert(ctx->IntegerAccumScaler > 0.0);
@@ -360,14 +361,14 @@ void gl_Accum( GLcontext *ctx, GLenum op, GLfloat value )
const GLaccum *acc = ctx->Buffer->Accum + ypos * width4 + xpos*4;
GLuint i, i4;
for (i = i4 = 0; i < width; i++, i4 += 4) {
- ASSERT(acc[i4+0] < divisor * 256);
- ASSERT(acc[i4+1] < divisor * 256);
- ASSERT(acc[i4+2] < divisor * 256);
- ASSERT(acc[i4+3] < divisor * 256);
- rgba[i][RCOMP] = divTable[acc[i4+0]];
- rgba[i][GCOMP] = divTable[acc[i4+1]];
- rgba[i][BCOMP] = divTable[acc[i4+2]];
- rgba[i][ACOMP] = divTable[acc[i4+3]];
+ ASSERT(acc[i4+0] < max);
+ ASSERT(acc[i4+1] < max);
+ ASSERT(acc[i4+2] < max);
+ ASSERT(acc[i4+3] < max);
+ rgba[i][RCOMP] = multTable[acc[i4+0]];
+ rgba[i][GCOMP] = multTable[acc[i4+1]];
+ rgba[i][BCOMP] = multTable[acc[i4+2]];
+ rgba[i][ACOMP] = multTable[acc[i4+3]];
}
if (ctx->Color.SWmasking) {
gl_mask_rgba_span( ctx, width, xpos, ypos, rgba );