diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/main/accum.c | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/src/mesa/main/accum.c b/src/mesa/main/accum.c index de660a84a6..adca8ec2f4 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 ); |