/*
* Translate pname to (term, alpha).
+ *
+ * The enums were given sequential values for a reason.
*/
switch (pname) {
case GL_SOURCE0_RGB:
- term = 0;
- alpha = GL_FALSE;
- break;
case GL_SOURCE1_RGB:
- term = 1;
- alpha = GL_FALSE;
- break;
case GL_SOURCE2_RGB:
- term = 2;
- alpha = GL_FALSE;
- break;
case GL_SOURCE3_RGB_NV:
- if (ctx->Extensions.NV_texture_env_combine4) {
- term = 3;
- alpha = GL_FALSE;
- }
- else {
- TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
- return;
- }
+ term = pname - GL_SOURCE0_RGB;
+ alpha = GL_FALSE;
break;
case GL_SOURCE0_ALPHA:
- term = 0;
- alpha = GL_TRUE;
- break;
case GL_SOURCE1_ALPHA:
- term = 1;
- alpha = GL_TRUE;
- break;
case GL_SOURCE2_ALPHA:
- term = 2;
- alpha = GL_TRUE;
- break;
case GL_SOURCE3_ALPHA_NV:
- if (ctx->Extensions.NV_texture_env_combine4) {
- term = 3;
- alpha = GL_TRUE;
- }
- else {
- TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
- return;
- }
+ term = pname - GL_SOURCE0_ALPHA;
+ alpha = GL_TRUE;
break;
default:
TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
return;
}
+ if ((term == 3) && !ctx->Extensions.NV_texture_env_combine4) {
+ TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+ return;
+ }
+
assert(term < MAX_COMBINER_TERMS);
/*
return;
}
+ /* The enums were given sequential values for a reason.
+ */
switch (pname) {
case GL_OPERAND0_RGB:
- term = 0;
- alpha = GL_FALSE;
- break;
case GL_OPERAND1_RGB:
- term = 1;
- alpha = GL_FALSE;
- break;
case GL_OPERAND2_RGB:
- term = 2;
- alpha = GL_FALSE;
- break;
case GL_OPERAND3_RGB_NV:
- if (ctx->Extensions.NV_texture_env_combine4) {
- term = 3;
- alpha = GL_FALSE;
- }
- else {
- TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
- return;
- }
+ term = pname - GL_OPERAND0_RGB;
+ alpha = GL_FALSE;
break;
case GL_OPERAND0_ALPHA:
- term = 0;
- alpha = GL_TRUE;
- break;
case GL_OPERAND1_ALPHA:
- term = 1;
- alpha = GL_TRUE;
- break;
case GL_OPERAND2_ALPHA:
- term = 2;
- alpha = GL_TRUE;
- break;
case GL_OPERAND3_ALPHA_NV:
- if (ctx->Extensions.NV_texture_env_combine4) {
- term = 3;
- alpha = GL_TRUE;
- }
- else {
- TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
- return;
- }
+ term = pname - GL_OPERAND0_ALPHA;
+ alpha = GL_TRUE;
break;
default:
TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
return;
}
+ if ((term == 3) && !ctx->Extensions.NV_texture_env_combine4) {
+ TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
+ return;
+ }
+
assert(term < MAX_COMBINER_TERMS);
/*