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// these includes don't do a lot in Linux, they are more needed in Win32 (for the OpenGL function call pointers)
// but they are used at least for checking if the necessary extensions are present
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ARB_multitexture.h"
#include "NV_register_combiners.h"
#include "EXT_paletted_texture.h"
/***********************************************************************************************
INTERESTING PART: *
handles initialization of the Nvidia register combiners for YUV->RGB conversion.
This code was created by Jens Schneider <schneider@glhint.de>
***********************************************************************************************/
GLuint Yhandle;
GLuint Uhandle;
GLuint Vhandle;
unsigned char *YPlane;
unsigned char *UPlane;
unsigned char *VPlane;
// YUV 4:2:2 example
unsigned int Ywidth=512, Yheight=512;
unsigned int UVwidth=256, UVheight=512;
int tex_xsize, tex_ysize;
void GenerateRGBTables(unsigned char *Ytable, // Y-palette
unsigned char *Utable, // U-palette
unsigned char *Vtable, // V-palette
float *bias, // bias (fourth vector to be added)
float *Uscale, // scaling color for U
float *Vscale) // scaling color for V
{
int i;
const float mat[9]= { // the modified YUV->RGB matrix
+1.130469478f,-0.058755723f,+1.596026304f,
+1.130469478f,-0.450515935f,-0.812967512f,
+1.130469478f,+1.958477882f, 0.0f
};
#define COMPRESS(a)(0.5f*(a)+128.0f) // counter-piece to EXPAND_NORMAL
#define fCOMPRESS(a) (0.5f*(a)+0.5f);
#define XCLAMP(a) ((a)<0.0f ? 0.0f : ((a)>255.0f ? 255.0f : (a))) // should not be necessary, but what do you know.
bias[0]=fCOMPRESS(-0.842580964f);
bias[1]=fCOMPRESS(+0.563287723f);
bias[2]=fCOMPRESS(-1.0f);
bias[3]=0.0f;
Uscale[0]=8.0f/255.0f;
Uscale[1]=60.0f/255.0f;
Uscale[2]=250.0f/255.0f;
Uscale[3]=0.0f;
Vscale[0]=204.0f/255.0f;
Vscale[1]=105.0f/255.0f;
Vscale[2]=0.5f;
Vscale[3]=0.0f;
for (i=0; i<256; i++) {
// Y-table holds unsigned values
Ytable[3*i ]=(unsigned char)XCLAMP(mat[0]*(float)i); // R
Ytable[3*i+1]=(unsigned char)XCLAMP(mat[3]*(float)i); // G
Ytable[3*i+2]=(unsigned char)XCLAMP(mat[6]*(float)i); // B
// U-table holds signed values
Utable[3*i ]=(unsigned char)XCLAMP(COMPRESS(255.0f/ 16.0f*mat[1]*(float)i)); // R
Utable[3*i+1]=(unsigned char)XCLAMP(COMPRESS(255.0f/120.0f*mat[4]*(float)i)); // G
Utable[3*i+2]=(unsigned char)XCLAMP(COMPRESS(255.0f/500.0f*mat[7]*(float)i)); // B
// V-table holds signed values
Vtable[3*i ]=(unsigned char)XCLAMP(COMPRESS(255.0f/408.0f*mat[2]*(float)i)); // R
Vtable[3*i+1]=(unsigned char)XCLAMP(COMPRESS(255.0f/210.0f*mat[5]*(float)i)); // G
Vtable[3*i+2]=(unsigned char)(128.0f-14.0f); // G constant
}
#undef fCOMPRESS
#undef COMPRESS
#undef XCLAMP
}
// Sets the constants. Call once prior to rendering.
void SetConsts(float *bias, float *Uscale, float *Vscale) {
glEnable(GL_REGISTER_COMBINERS_NV);
glColor3fv(bias);
//printf("%f %f %f\n",bias[0],bias[1],bias[2]);
glCombinerParameterfvNV(GL_CONSTANT_COLOR0_NV,Uscale);
glCombinerParameterfvNV(GL_CONSTANT_COLOR1_NV,Vscale);
}
/*
* SOFTWARE PATH
*/
inline void map_EXPAND_NORMAL(float *v) {
v[0]=2.0f*v[0]-1.0f;
v[1]=2.0f*v[1]-1.0f;
v[2]=2.0f*v[2]-1.0f;
}
inline void map_UNSIGNED_INVERT(float *v) {
v[0]=1.0f-v[0];
v[1]=1.0f-v[1];
v[2]=1.0f-v[2];
}
inline void map_UNSIGNED_IDENTITY(float *v) {
v[0]=(v[0]<0.0f ? 0.0f : v[0]);
v[1]=(v[1]<0.0f ? 0.0f : v[1]);
v[2]=(v[2]<0.0f ? 0.0f : v[2]);
}
inline void map_SIGNED_IDENTITY(float *v) {
}
inline void omap_SCALE_BY_TWO(float *v) {
v[0]*=2.0f;
v[1]*=2.0f;
v[2]*=2.0f;
}
inline void omap_SCALE_BY_ONE_HALF(float *v) {
v[0]*=0.5f;
v[1]*=0.5f;
v[2]*=0.5f;
}
inline void omap_RANGE(float *v) {
v[0]=(v[0]<-1.0f ? -1.0f : (v[0]>1.0f ? 1.0f : v[0]));
v[1]=(v[1]<-1.0f ? -1.0f : (v[1]>1.0f ? 1.0f : v[1]));
v[2]=(v[2]<-1.0f ? -1.0f : (v[2]>1.0f ? 1.0f : v[2]));
}
inline void omap_CLAMP_01(float *v) {
v[0]=(v[0]<0.0f ? 0.0f : (v[0]>1.0f ? 1.0f : v[0]));
v[1]=(v[1]<0.0f ? 0.0f : (v[1]>1.0f ? 1.0f : v[1]));
v[2]=(v[2]<0.0f ? 0.0f : (v[2]>1.0f ? 1.0f : v[2]));
}
void PerformSWCombiner(unsigned char *Result,
unsigned char *tex0,
unsigned char *tex1,
unsigned char *tex2,
float *COLOR0,
float *CONST0,
float *CONST1
)
{
float SPARE0[3];
float SPARE1[3];
float A[3],B[3],C[3],D[3];
float TEX0[3],TEX1[3],TEX2[3];
float ZERO[3]={0.0f,0.0f,0.0f};
TEX0[0]=(float)tex0[0]/255.0f;
TEX0[1]=(float)tex0[1]/255.0f;
TEX0[2]=(float)tex0[2]/255.0f;
TEX1[0]=(float)tex1[0]/255.0f;
TEX1[1]=(float)tex1[1]/255.0f;
TEX1[2]=(float)tex1[2]/255.0f;
TEX2[0]=(float)tex2[0]/255.0f;
TEX2[1]=(float)tex2[1]/255.0f;
TEX2[2]=(float)tex2[2]/255.0f;
// Combiner Stage 0:
memcpy(A,TEX0,3*sizeof(float)); map_UNSIGNED_IDENTITY(A);
memcpy(B,ZERO,3*sizeof(float)); map_UNSIGNED_INVERT(B);
memcpy(C,COLOR0,3*sizeof(float)); map_EXPAND_NORMAL(C);
memcpy(D,ZERO,3*sizeof(float)); map_UNSIGNED_INVERT(D);
SPARE0[0]=A[0]*B[0]+C[0]*D[0];
SPARE0[1]=A[1]*B[1]+C[1]*D[1];
SPARE0[2]=A[2]*B[2]+C[2]*D[2];
omap_SCALE_BY_ONE_HALF(SPARE0);
omap_RANGE(SPARE0);
// Combiner Stage 1:
memcpy(A,TEX1,3*sizeof(float)); map_EXPAND_NORMAL(A);
memcpy(B,CONST0,3*sizeof(float)); map_UNSIGNED_IDENTITY(B);
memcpy(C,TEX2,3*sizeof(float)); map_EXPAND_NORMAL(C);
memcpy(D,CONST1,3*sizeof(float)); map_UNSIGNED_IDENTITY(D);
SPARE1[0]=A[0]*B[0]+C[0]*D[0];
SPARE1[1]=A[1]*B[1]+C[1]*D[1];
SPARE1[2]=A[2]*B[2]+C[2]*D[2];
omap_RANGE(SPARE1);
// Combiner Stage 2:
memcpy(A,SPARE0,3*sizeof(float)); map_SIGNED_IDENTITY(A);
memcpy(B,ZERO,3*sizeof(float)); map_UNSIGNED_INVERT(B);
memcpy(C,SPARE1,3*sizeof(float)); map_SIGNED_IDENTITY(C);
memcpy(D,ZERO,3*sizeof(float)); map_UNSIGNED_INVERT(D);
SPARE0[0]=A[0]*B[0]+C[0]*D[0];
SPARE0[1]=A[1]*B[1]+C[1]*D[1];
SPARE0[2]=A[2]*B[2]+C[2]*D[2];
omap_SCALE_BY_TWO(SPARE0);
omap_RANGE(SPARE0);
// Final Combiner Stage:
memcpy(A,ZERO,3*sizeof(float)); map_UNSIGNED_INVERT(A);
memcpy(B,SPARE0,3*sizeof(float)); map_UNSIGNED_IDENTITY(B);
memcpy(C,ZERO,3*sizeof(float)); map_UNSIGNED_IDENTITY(C);
memcpy(D,ZERO,3*sizeof(float)); map_UNSIGNED_IDENTITY(D);
SPARE0[0]=A[0]*B[0]+(1.0f-A[0])*C[0]+D[0];
SPARE0[1]=A[1]*B[1]+(1.0f-A[1])*C[1]+D[1];
SPARE0[2]=A[2]*B[2]+(1.0f-A[2])*C[2]+D[2];
omap_CLAMP_01(SPARE0);
Result[0]=(unsigned char)(SPARE0[0]*255.0f);
Result[1]=(unsigned char)(SPARE0[1]*255.0f);
Result[2]=(unsigned char)(SPARE0[2]*255.0f);
}
// Sets up the register combiners. Call once prior to rendering
void SetupCombiners(void)
{
glCombinerParameteriNV(GL_NUM_GENERAL_COMBINERS_NV,3);
// Combiner Stage 0: th. OK
glCombinerInputNV (GL_COMBINER0_NV,GL_RGB,GL_VARIABLE_A_NV,GL_TEXTURE0_ARB, GL_UNSIGNED_IDENTITY_NV,GL_RGB);
glCombinerInputNV (GL_COMBINER0_NV,GL_RGB,GL_VARIABLE_B_NV,GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
glCombinerInputNV (GL_COMBINER0_NV,GL_RGB,GL_VARIABLE_C_NV,GL_PRIMARY_COLOR_NV,GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerInputNV (GL_COMBINER0_NV,GL_RGB,GL_VARIABLE_D_NV,GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER0_NV,GL_RGB,GL_DISCARD_NV,GL_DISCARD_NV,GL_SPARE0_NV,GL_SCALE_BY_ONE_HALF_NV,GL_NONE,GL_FALSE,GL_FALSE,GL_FALSE);
// Combiner Stage 1: th. OK
glCombinerInputNV (GL_COMBINER1_NV,GL_RGB,GL_VARIABLE_A_NV,GL_TEXTURE1_ARB, GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerInputNV (GL_COMBINER1_NV,GL_RGB,GL_VARIABLE_B_NV,GL_CONSTANT_COLOR0_NV,GL_UNSIGNED_IDENTITY_NV,GL_RGB);
glCombinerInputNV (GL_COMBINER1_NV,GL_RGB,GL_VARIABLE_C_NV,GL_TEXTURE2_ARB, GL_EXPAND_NORMAL_NV, GL_RGB);
glCombinerInputNV (GL_COMBINER1_NV,GL_RGB,GL_VARIABLE_D_NV,GL_CONSTANT_COLOR1_NV,GL_UNSIGNED_IDENTITY_NV,GL_RGB);
glCombinerOutputNV(GL_COMBINER1_NV,GL_RGB,GL_DISCARD_NV,GL_DISCARD_NV,GL_SPARE1_NV,GL_NONE,GL_NONE,GL_FALSE,GL_FALSE,GL_FALSE);
// Combiner Stage 2: th. OK
glCombinerInputNV (GL_COMBINER2_NV,GL_RGB,GL_VARIABLE_A_NV,GL_SPARE0_NV, GL_SIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV (GL_COMBINER2_NV,GL_RGB,GL_VARIABLE_B_NV,GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
glCombinerInputNV (GL_COMBINER2_NV,GL_RGB,GL_VARIABLE_C_NV,GL_SPARE1_NV, GL_SIGNED_IDENTITY_NV, GL_RGB);
glCombinerInputNV (GL_COMBINER2_NV,GL_RGB,GL_VARIABLE_D_NV,GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
glCombinerOutputNV(GL_COMBINER2_NV,GL_RGB,GL_DISCARD_NV,GL_DISCARD_NV,GL_SPARE0_NV,GL_SCALE_BY_TWO_NV,GL_NONE,GL_FALSE,GL_FALSE,GL_FALSE);
// Final Sage: th. OK
glFinalCombinerInputNV(GL_VARIABLE_A_NV,GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_B_NV,GL_SPARE0_NV,GL_UNSIGNED_IDENTITY_NV,GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_C_NV,GL_ZERO, GL_UNSIGNED_IDENTITY_NV,GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_D_NV,GL_ZERO, GL_UNSIGNED_IDENTITY_NV,GL_RGB);
glFinalCombinerInputNV(GL_VARIABLE_G_NV,GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
}
unsigned int PowerOfTwo(unsigned int i) {
unsigned int bitsum=0;
unsigned int shifts=0;
unsigned int j=(unsigned int)i;
// Check wether i is a power of two - may contain at most one set bit
do {
bitsum+=j&1;
j=j>>1;
++shifts;
} while (j>0);
if (bitsum==1) return i;
else return (1<<shifts);
}
// Initializes textures. Call once prior to rendering
void InitYUVPlanes(GLuint *Yhandle, GLuint *Uhandle, GLuint *Vhandle,
unsigned int Ywidth, unsigned int Yheight,
unsigned int UVwidth, unsigned int UVheight,
GLenum filter, // filter should be either GL_NEAREST or GL_LINEAR. Test this!
unsigned char* Ypal, unsigned char *Upal, unsigned char *Vpal)
{
glGenTextures(1,Yhandle);
glGenTextures(1,Uhandle);
glGenTextures(1,Vhandle);
glBindTexture(GL_TEXTURE_2D,(*Yhandle));
#ifdef _WIN32
glColorTableEXT(GL_TEXTURE_2D,GL_RGB8,256,GL_RGB,GL_UNSIGNED_BYTE,Ypal);
#else // Hopefully Linux
glColorTable(GL_TEXTURE_2D,GL_RGB8,256,GL_RGB,GL_UNSIGNED_BYTE,Ypal);
#endif
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,filter);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,filter);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
tex_xsize = PowerOfTwo(Ywidth);
tex_ysize = PowerOfTwo(Yheight);
glTexImage2D(GL_TEXTURE_2D,0,GL_COLOR_INDEX8_EXT,PowerOfTwo(Ywidth),PowerOfTwo(Yheight),0,GL_COLOR_INDEX,GL_UNSIGNED_BYTE,NULL);
glBindTexture(GL_TEXTURE_2D,(*Uhandle));
#ifdef _WIN32
glColorTableEXT(GL_TEXTURE_2D,GL_RGB8,256,GL_RGB,GL_UNSIGNED_BYTE,Upal);
#else // Hopefully Linux
glColorTable(GL_TEXTURE_2D,GL_RGB8,256,GL_RGB,GL_UNSIGNED_BYTE,Upal);
#endif
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,filter);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,filter);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
glTexImage2D(GL_TEXTURE_2D,0,GL_COLOR_INDEX8_EXT,PowerOfTwo(UVwidth),PowerOfTwo(UVheight),0,GL_COLOR_INDEX,GL_UNSIGNED_BYTE,NULL);
glBindTexture(GL_TEXTURE_2D,(*Vhandle));
#ifdef _WIN32
glColorTableEXT(GL_TEXTURE_2D,GL_RGB8,256,GL_RGB,GL_UNSIGNED_BYTE,Vpal);
#else // Hopefully Linux
glColorTable(GL_TEXTURE_2D,GL_RGB8,256,GL_RGB,GL_UNSIGNED_BYTE,Vpal);
#endif
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,filter);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,filter);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
glTexImage2D(GL_TEXTURE_2D,0,GL_COLOR_INDEX8_EXT,PowerOfTwo(UVwidth),PowerOfTwo(UVheight),0,GL_COLOR_INDEX,GL_UNSIGNED_BYTE,NULL);
}
void LoadYUVPlanes(GLuint Yhandle, GLuint Uhandle, GLuint Vhandle,
unsigned int Ywidth, unsigned int Yheight,
unsigned int UVwidth, unsigned int UVheight,
unsigned char *Ydata,
unsigned char *Udata,
unsigned char *Vdata)
{
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_2D,Yhandle);
glTexSubImage2D(GL_TEXTURE_2D,0,0,0,Ywidth,Yheight,GL_COLOR_INDEX,GL_UNSIGNED_BYTE,Ydata);
glEnable(GL_TEXTURE_2D);
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_2D,Uhandle);
glTexSubImage2D(GL_TEXTURE_2D,0,0,0,UVwidth,UVheight,GL_COLOR_INDEX,GL_UNSIGNED_BYTE,Udata);
glEnable(GL_TEXTURE_2D);
glActiveTextureARB(GL_TEXTURE2_ARB);
glBindTexture(GL_TEXTURE_2D,Vhandle);
glTexSubImage2D(GL_TEXTURE_2D,0,0,0,UVwidth,UVheight,GL_COLOR_INDEX,GL_UNSIGNED_BYTE,Vdata);
glEnable(GL_TEXTURE_2D);
}
void Initialize_Backend(unsigned int Ywidth, unsigned int Yheight, unsigned int UVwidth, unsigned int UVheight, GLenum filter)
{
printf("Reinitializing register combiner backend with res %d x %d!\n", Ywidth, Yheight);
//if (!GL_ARB_multitexture_Init()) exit(0);
//if (!GL_EXT_paletted_texture_Init()) exit(0);
//if (!GL_NV_register_combiners_Init()) exit(0);
unsigned char Ypal[768];
unsigned char Upal[768];
unsigned char Vpal[768];
float bias[4];
float Uscale[4];
float Vscale[4];
GenerateRGBTables(Ypal,Upal,Vpal,bias,Uscale,Vscale);
InitYUVPlanes(&Yhandle,&Uhandle,&Vhandle,Ywidth,Yheight,UVwidth,UVheight,filter,Ypal,Upal,Vpal);
SetupCombiners();
SetConsts(bias,Uscale,Vscale);
}
void initialize(GLenum filter) {
glShadeModel(GL_SMOOTH);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
glClearColor(0.0f,0.0f,0.2f,1.0f);
Initialize_Backend(Ywidth,Yheight,UVwidth,UVheight,filter);
}
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