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GPU : GPU_SetViewport

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smea 2014-03-12 18:28:25 +01:00
parent 452737574d
commit 21dbf5aa75
2 changed files with 48 additions and 0 deletions
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1
libctru/include/ctr/GPU.h
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@ -11,5 +11,6 @@ void GPUCMD_AddSingleParam(u32 cmd, u32 param);
void GPUCMD_Finalize();
void GPU_SetUniform(u32 startreg, u32* data, u32 numreg);
void GPU_SetViewport(u32 x, u32 y, float w, float h);
#endif

47
libctru/source/GPU.c
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@ -198,3 +198,50 @@ void GPU_SetUniform(u32 startreg, u32* data, u32 numreg)
GPUCMD_AddSingleParam(0x000F02C0, 0x80000000|startreg);
GPUCMD_Add(0x000F02C1, data, numreg*4);
}
u32 f32tof24(float f)
{
u32 v=*((u32*)&f);
u8 s=v>>31;
u32 exp=((v>>23)&0xFF)-0x40;
u32 man=(v>>7)&0xFFFF;
if(exp>=0)return man|(exp<<16)|(s<<23);
else return s<<23;
}
u32 computeInvValue(u32 val)
{
//usual values
if(val==240)return 0x38111111;
if(val==480)return 0x37111111;
if(val==400)return 0x3747ae14;
//but let's not limit ourselves to the usual
float fval=2.0/val;
u32 tmp1,tmp2;
u32 tmp3=*((u32*)&fval);
tmp1=(tmp3<<9)>>9;
tmp2=tmp3&(~0x80000000);
if(tmp3&(~0x80000000))
{
tmp1=(tmp3<<9)>>9;
int tmp=((tmp3<<1)>>24)-0x40;
if(tmp<0)return ((tmp3>>31)<<30)<<1;
else tmp2=tmp;
}
tmp3>>=31;
return (tmp1|(tmp2<<23)|(tmp3<<30))<<1;
}
void GPU_SetViewport(u32 x, u32 y, float w, float h)
{
u32 param[0x4];
param[0x0]=f32tof24(w/2);
param[0x1]=computeInvValue(w);
param[0x2]=f32tof24(h/2);
param[0x3]=computeInvValue(h);
GPUCMD_Add(0x800F0041, param, 0x00000004);
GPUCMD_AddSingleParam(0x000F0068, (y<<16)|(x&0xFFFF));
}