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Optimize skydome rendering. Moves 4 multiplies from inner loop to outer loop. Saves 448 multiplies per pass.

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This commit is contained in:
Ragnvald Maartmann-Moe IV 2001-01-26 05:50:13 +00:00
parent c8ab801128
commit e1f4bc624a
1 changed files with 10 additions and 11 deletions
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21
source/gl_sky.c
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@ -29,12 +29,11 @@
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
#include <string.h>
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
# include <strings.h>
#endif
#include "console.h"
@ -186,10 +185,10 @@ R_DrawSkyLayer (float s)
vec3_t v;
for (a = 0; a < 16; a++) {
a1x = bubble_costable[a * 2];
a1y = -bubble_sintable[a * 2];
a2x = bubble_costable[(a + 1) * 2];
a2y = -bubble_sintable[(a + 1) * 2];
a1x = bubble_costable[a * 2] * domescale[0];
a1y = -bubble_sintable[a * 2] * domescale[1];
a2x = bubble_costable[(a + 1) * 2] * domescale[0];
a2y = -bubble_sintable[(a + 1) * 2] * domescale[1];
glBegin (GL_TRIANGLE_STRIP);
glTexCoord2f (0.5 + s * (1.0 / 128.0), 0.5 + s * (1.0 / 128.0));
@ -199,16 +198,16 @@ R_DrawSkyLayer (float s)
x = bubble_costable[b * 2 + 16];
y = -bubble_sintable[b * 2 + 16];
v[0] = a1x * x * domescale[0];
v[1] = a1y * x * domescale[1];
v[0] = a1x * x;
v[1] = a1y * x;
v[2] = y * domescale[2];
glTexCoord2f ((v[0] + s) * (1.0 / 128.0),
(v[1] + s) * (1.0 / 128.0));
glVertex3f (v[0] + r_refdef.vieworg[0],
v[1] + r_refdef.vieworg[1], v[2] + r_refdef.vieworg[2]);
v[0] = a2x * x * domescale[0];
v[1] = a2y * x * domescale[1];
v[0] = a2x * x;
v[1] = a2y * x;
v[2] = y * domescale[2];
glTexCoord2f ((v[0] + s) * (1.0 / 128.0),
(v[1] + s) * (1.0 / 128.0));