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copy CalcBlend from newtree

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This commit is contained in:
Bill Currie 2000-10-02 17:26:39 +00:00
parent f386c3f79c
commit 0808c65d17
1 changed files with 32 additions and 21 deletions
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53
source/gl_view.c
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@ -34,18 +34,21 @@
#include "client.h"
#include "host.h"
#include "console.h"
#include "compat.h"
byte ramps[3][256];
float v_blend[4]; // rgba 0.0 - 1.0
/*
=============
V_CalcBlend
=============
V_CalcBlend
LordHavoc made this a real, (messy,) true alpha blend. Cleaned it up
a bit, but otherwise this is his code. --KB
*/
void V_CalcBlend (void)
void
V_CalcBlend (void)
{
float r, g, b, a, a2;
float r, g, b, a, a2, a3;
int j;
r = 0;
@ -53,32 +56,40 @@ void V_CalcBlend (void)
b = 0;
a = 0;
for (j=0 ; j<NUM_CSHIFTS ; j++)
for (j=0 ; j<NUM_CSHIFTS ; j++)
{
if (!gl_cshiftpercent->value)
continue;
a2 = ((cl.cshifts[j].percent * gl_cshiftpercent->value) / 100.0) / 255.0;
// a2 = cl.cshifts[j].percent/255.0;
if (!a2)
continue;
a = a + a2*(1-a);
//Con_Printf ("j:%i a:%f\n", j, a);
a2 = a2/a;
r = r*(1-a2) + cl.cshifts[j].destcolor[0]*a2;
g = g*(1-a2) + cl.cshifts[j].destcolor[1]*a2;
b = b*(1-a2) + cl.cshifts[j].destcolor[2]*a2;
a2 = min(a2, 1.0);
r += (cl.cshifts[j].destcolor[0]-r) * a2;
g += (cl.cshifts[j].destcolor[1]-g) * a2;
b += (cl.cshifts[j].destcolor[2]-b) * a2;
a3 = (1.0 - a) * (1.0 - a2);
a = 1.0 - a3;
}
v_blend[0] = r/255.0;
v_blend[1] = g/255.0;
v_blend[2] = b/255.0;
v_blend[3] = a;
if (v_blend[3] > 1)
v_blend[3] = 1;
if (v_blend[3] < 0)
v_blend[3] = 0;
// LordHavoc: saturate color
if (a)
{
a2 = 1.0 / a;
r *= a2;
g *= a2;
b *= a2;
if (a > 1) // clamp alpha blend too
a = 1;
}
v_blend[0] = min(r, 255.0)/255.0;
v_blend[1] = min(g, 255.0)/255.0;
v_blend[2] = min(b, 255.0)/255.0;
v_blend[3] = bound (0.0, a, 1.0);
}
/*