/*

File: Debug.c

Abstract:

Version: 1.2

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*/

#include <OpenGLES/ES1/gl.h>

#include <OpenGLES/ES1/glext.h>

#include "Debug.h"

// Debug utility: validate the current texture environment against MBX errata.

// Assert if we use a state combination not supported by the MBX hardware.

void validateTexEnv(void)

{

#if DEBUG

typedef struct {

GLint combine;

GLint src[3];

GLint op[3];

GLint scale;

} Channel;

typedef struct {

GLint enabled;

GLint binding;

GLint mode;

Channel rgb;

Channel a;

GLfloat color[4];

} TexEnv;

// MBX supports two texture units

TexEnv unit[2];

GLint active;

int i, prev = -1;

glGetIntegerv(GL_ACTIVE_TEXTURE, &active);

for (i = 0; i < 2; i++)

{

glActiveTexture(GL_TEXTURE0+i);

unit[i].enabled = glIsEnabled(GL_TEXTURE_2D);

glGetIntegerv(GL_TEXTURE_BINDING_2D, &unit[i].binding);

glGetTexEnviv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, &unit[i].mode);

glGetTexEnviv(GL_TEXTURE_ENV, GL_COMBINE_RGB, &unit[i].rgb.combine);

glGetTexEnviv(GL_TEXTURE_ENV, GL_SRC0_RGB, &unit[i].rgb.src[0]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_SRC1_RGB, &unit[i].rgb.src[1]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_SRC2_RGB, &unit[i].rgb.src[2]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_OPERAND0_RGB, &unit[i].rgb.op[0]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_OPERAND1_RGB, &unit[i].rgb.op[1]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_OPERAND2_RGB, &unit[i].rgb.op[2]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_RGB_SCALE, &unit[i].rgb.scale);

glGetTexEnviv(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, &unit[i].a.combine);

glGetTexEnviv(GL_TEXTURE_ENV, GL_SRC0_ALPHA, &unit[i].a.src[0]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_SRC1_ALPHA, &unit[i].a.src[1]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_SRC2_ALPHA, &unit[i].a.src[2]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, &unit[i].a.op[0]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, &unit[i].a.op[1]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA, &unit[i].a.op[2]);

glGetTexEnviv(GL_TEXTURE_ENV, GL_ALPHA_SCALE, &unit[i].a.scale);

glGetTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, &unit[i].color[0]);

if (unit[i].enabled == 0) continue;

if (unit[i].mode != GL_COMBINE) continue;

// PREVIOUS on unit 0 means PRIMARY_COLOR.

if (i == 0)

{

int j;

for (j = 0; j < 3; j++)

{

if (unit[i].rgb.src[j] == GL_PREVIOUS)

unit[i].rgb.src[j] = GL_PRIMARY_COLOR;

if (unit[i].a.src[j] == GL_PREVIOUS)

unit[i].a.src[j] = GL_PRIMARY_COLOR;

}

}

// If the value of COMBINE_RGB is MODULATE, only one of the two multiplicands can use an ALPHA operand.

rt_assert(!(unit[i].rgb.combine == GL_MODULATE &&

(unit[i].rgb.op[0] == GL_SRC_ALPHA || unit[i].rgb.op[0] == GL_ONE_MINUS_SRC_ALPHA) &&

(unit[i].rgb.op[1] == GL_SRC_ALPHA || unit[i].rgb.op[1] == GL_ONE_MINUS_SRC_ALPHA)));

// If the value of COMBINE_RGB is INTERPOLATE and either SRC0 or SRC1 uses an ALPHA operand, SRC2 can not be CONSTANT or PRIMARY_COLOR or use an ALPHA operand.

rt_assert(!(unit[i].rgb.combine == GL_INTERPOLATE &&

(unit[i].rgb.op[0] == GL_SRC_ALPHA || unit[i].rgb.op[0] == GL_ONE_MINUS_SRC_ALPHA ||

unit[i].rgb.op[1] == GL_SRC_ALPHA || unit[i].rgb.op[1] == GL_ONE_MINUS_SRC_ALPHA) &&

(unit[i].rgb.op[2] == GL_SRC_ALPHA || unit[i].rgb.op[2] == GL_ONE_MINUS_SRC_ALPHA ||

unit[i].rgb.src[2] == GL_CONSTANT || unit[i].rgb.src[2] == GL_PRIMARY_COLOR)));

// If the value of COMBINE_RGB is INTERPOLATE and SRC0 and SRC1 are CONSTANT or PRIMARY COLOR, SRC2 can not be CONSTANT or PRIMARY_COLOR or use an ALPHA operand.

rt_assert(!(unit[i].rgb.combine == GL_INTERPOLATE &&

((unit[i].rgb.src[0] == GL_CONSTANT && unit[i].rgb.src[1] == GL_CONSTANT) ||

(unit[i].rgb.src[0] == GL_PRIMARY_COLOR && unit[i].rgb.src[1] == GL_PRIMARY_COLOR)) &&

(unit[i].rgb.op[2] == GL_SRC_ALPHA || unit[i].rgb.op[2] == GL_ONE_MINUS_SRC_ALPHA ||

unit[i].rgb.src[2] == GL_CONSTANT || unit[i].rgb.src[2] == GL_PRIMARY_COLOR)));

// If the value of COMBINE_RGB is DOT3_RGB or DOT3_RGBA, only one of the sources can be PRIMARY_COLOR or use an ALPHA operand.

rt_assert(!((unit[i].rgb.combine == GL_DOT3_RGB || unit[i].rgb.combine == GL_DOT3_RGBA) &&

(unit[i].rgb.src[0] == GL_PRIMARY_COLOR || unit[i].rgb.op[0] == GL_SRC_ALPHA || unit[i].rgb.op[0] == GL_ONE_MINUS_SRC_ALPHA) &&

(unit[i].rgb.src[1] == GL_PRIMARY_COLOR || unit[i].rgb.op[1] == GL_SRC_ALPHA || unit[i].rgb.op[1] == GL_ONE_MINUS_SRC_ALPHA)));

// If the value of COMBINE_RGB is SUBTRACT, SCALE_RGB must be 1.0.

rt_assert(!(unit[i].rgb.combine == GL_SUBTRACT && unit[i].rgb.scale != 1));

if (unit[i].rgb.combine != GL_DOT3_RGBA)

{

// If the value of COMBINE_ALPHA is MODULATE or INTERPOLATE, only one of the two multiplicands can be CONSTANT.

rt_assert(!(unit[i].a.combine == GL_MODULATE && unit[i].a.src[0] == GL_CONSTANT && unit[i].a.src[1] == GL_CONSTANT));

rt_assert(!(unit[i].a.combine == GL_INTERPOLATE && (unit[i].a.src[0] == GL_CONSTANT || unit[i].a.src[1] == GL_CONSTANT) && unit[i].a.src[2] == GL_CONSTANT));

// If the value of COMBINE_ALPHA is SUBTRACT, SCALE_ALPHA must be 1.0.

rt_assert(!(unit[i].a.combine == GL_SUBTRACT && unit[i].a.scale != 1));

}

// The value of TEXTURE_ENV_COLOR must be the same for all texture units that CONSTANT is used on.

if (unit[i].rgb.src[0] == GL_CONSTANT ||

(unit[i].rgb.src[1] == GL_CONSTANT && unit[i].rgb.combine != GL_REPLACE) ||

(unit[i].rgb.src[2] == GL_CONSTANT && unit[i].rgb.combine == GL_INTERPOLATE) ||

(unit[i].rgb.combine != GL_DOT3_RGBA &&

(unit[i].a.src[0] == GL_CONSTANT ||

(unit[i].a.src[1] == GL_CONSTANT && unit[i].a.combine != GL_REPLACE) ||

(unit[i].a.src[2] == GL_CONSTANT && unit[i].a.combine == GL_INTERPOLATE))))

{

if (prev >= 0)

rt_assert(!(unit[prev].color[0] != unit[i].color[0] ||

unit[prev].color[1] != unit[i].color[1] ||

unit[prev].color[2] != unit[i].color[2] ||

unit[prev].color[3] != unit[i].color[3]));

prev = i;

}

}

glActiveTexture(active);

glCheckError();

#endif /* DEBUG */

}