texture_env_combine.h

#ifndef TEXTURE_ENV_COMBINE_H
#define TEXTURE_ENV_COMBINE_H

struct TexEnvCombinerArg
{
    GLenum source, operand;
};

struct TexEnvCombinerStage
{
    WORD constant;
    BOOL used;
    GLenum combine;
    TexEnvCombinerArg arg0, arg1, arg2;
    WORD outputTexture;
};

struct TexEnvCombiner
{
    BOOL usesT0, usesT1, usesNoise;

    WORD usedUnits;

    struct
    {
        WORD color, secondaryColor, alpha;
    } vertex;

    TexEnvCombinerStage color[8];
    TexEnvCombinerStage alpha[8];
};

static TexEnvCombinerArg TexEnvArgs[] =
{
    // CMB
    {GL_PREVIOUS_ARB, GL_SRC_COLOR},
    // T0
    {GL_TEXTURE, GL_SRC_COLOR},
    // T1
    {GL_TEXTURE, GL_SRC_COLOR},
    // PRIM
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // SHADE
    {GL_PRIMARY_COLOR_ARB, GL_SRC_COLOR},
    // ENV
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // CENTER
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // SCALE
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // CMBALPHA
    {GL_PREVIOUS_ARB, GL_SRC_ALPHA},
    // T0ALPHA
    {GL_TEXTURE, GL_SRC_ALPHA},
    // T1ALPHA
    {GL_TEXTURE, GL_SRC_ALPHA},
    // PRIMALPHA
    {GL_CONSTANT_ARB, GL_SRC_ALPHA},
    // SHADEALPHA
    {GL_PRIMARY_COLOR_ARB, GL_SRC_ALPHA},
    // ENVALPHA
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // LODFRAC
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // PRIMLODFRAC
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // NOISE
    {GL_TEXTURE, GL_SRC_COLOR},
    // K4
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // K5
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // ONE
    {GL_CONSTANT_ARB, GL_SRC_COLOR},
    // ZERO
    {GL_CONSTANT_ARB, GL_SRC_COLOR}
};

void Init_texture_env_combine();
TexEnvCombiner* Compile_texture_env_combine(Combiner* color, Combiner* alpha);
void Set_texture_env_combine(TexEnvCombiner* envCombiner);
void Update_texture_env_combine_Colors(TexEnvCombiner*);
void Uninit_texture_env_combine();
void BeginTextureUpdate_texture_env_combine();
void EndTextureUpdate_texture_env_combine();
#endif