83 lines
1.5 KiB
C
83 lines
1.5 KiB
C
|
#include "internal.h"
|
||
|
|
|
||
|
|
void FogLut_FromArray(C3D_FogLut* lut, const float data[256])
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
for (i = 0; i < 128; i ++)
|
||
|
|
{
|
||
|
|
float in = data[i], diff = data[i+128];
|
||
|
|
|
||
|
|
u32 val = 0;
|
||
|
|
if (in > 0.0f)
|
||
|
|
{
|
||
|
|
in *= 0x800;
|
||
|
|
val = (in < 0x800) ? (u32)in : 0x7FF;
|
||
|
|
}
|
||
|
|
|
||
|
|
u32 val2 = 0;
|
||
|
|
if (diff != 0.0f)
|
||
|
|
{
|
||
|
|
diff *= 0x800;
|
||
|
|
if (diff < -0x1000) diff = -0x1000;
|
||
|
|
else if (diff > 0xFFF) diff = 0xFFF;
|
||
|
|
val2 = (s32)diff & 0x1FFF;
|
||
|
|
}
|
||
|
|
|
||
|
|
lut->data[i] = val2 | (val << 13);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void FogLut_Exp(C3D_FogLut* lut, float density, float gradient, float near, float far)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
float data[256];
|
||
|
|
for (i = 0; i <= 128; i ++)
|
||
|
|
{
|
||
|
|
float x = FogLut_CalcZ(i/128.0f, near, far);
|
||
|
|
float val = expf(-powf(density*x, gradient));
|
||
|
|
if (i < 128)
|
||
|
|
data[i] = val;
|
||
|
|
if (i > 0)
|
||
|
|
data[i+127] = val-data[i-1];
|
||
|
|
}
|
||
|
|
FogLut_FromArray(lut, data);
|
||
|
|
}
|
||
|
|
|
||
|
|
void C3D_FogGasMode(GPU_FOGMODE fogMode, GPU_GASMODE gasMode, bool zFlip)
|
||
|
|
{
|
||
|
|
C3D_Context* ctx = C3Di_GetContext();
|
||
|
|
|
||
|
|
if (!(ctx->flags & C3DiF_Active))
|
||
|
|
return;
|
||
|
|
|
||
|
|
ctx->flags |= C3DiF_TexEnvBuf;
|
||
|
|
ctx->texEnvBuf &= ~0x100FF;
|
||
|
|
ctx->texEnvBuf |= (fogMode&7) | ((gasMode&1)<<3) | (zFlip ? BIT(16) : 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void C3D_FogColor(u32 color)
|
||
|
|
{
|
||
|
|
C3D_Context* ctx = C3Di_GetContext();
|
||
|
|
|
||
|
|
if (!(ctx->flags & C3DiF_Active))
|
||
|
|
return;
|
||
|
|
|
||
|
|
ctx->flags |= C3DiF_TexEnvBuf;
|
||
|
|
ctx->fogClr = color;
|
||
|
|
}
|
||
|
|
|
||
|
|
void C3D_FogLutBind(C3D_FogLut* lut)
|
||
|
|
{
|
||
|
|
C3D_Context* ctx = C3Di_GetContext();
|
||
|
|
|
||
|
|
if (!(ctx->flags & C3DiF_Active))
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (lut)
|
||
|
|
{
|
||
|
|
ctx->flags |= C3DiF_FogLut;
|
||
|
|
ctx->fogLut = lut;
|
||
|
|
} else
|
||
|
|
ctx->flags &= ~C3DiF_FogLut;
|
||
|
|
}
|