+ if (span->arrayMask & SPAN_RGBA) {
+ /* Use array's alpha values */
+ if (span->array->ChanType == GL_UNSIGNED_BYTE) {
+ GLubyte (*rgba)[4] = span->array->rgba8;
+ GLubyte ref;
+ CLAMPED_FLOAT_TO_UBYTE(ref, ctx->Color.AlphaRef);
+ ALPHA_TEST(rgba[i][ACOMP], ;);
+ }
+ else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
+ GLushort (*rgba)[4] = span->array->rgba16;
+ GLushort ref;
+ CLAMPED_FLOAT_TO_USHORT(ref, ctx->Color.AlphaRef);
+ ALPHA_TEST(rgba[i][ACOMP], ;);
+ }
+ else {
+ GLfloat (*rgba)[4] = span->array->attribs[VARYING_SLOT_COL0];
+ const GLfloat ref = ctx->Color.AlphaRef;
+ ALPHA_TEST(rgba[i][ACOMP], ;);
+ }
+ }
+ else {
+ /* Interpolate alpha values */
+ ASSERT(span->interpMask & SPAN_RGBA);
+ if (span->array->ChanType == GL_UNSIGNED_BYTE) {
+ const GLfixed alphaStep = span->alphaStep;
+ GLfixed alpha = span->alpha;
+ GLubyte ref;
+ CLAMPED_FLOAT_TO_UBYTE(ref, ctx->Color.AlphaRef);
+ ALPHA_TEST(FixedToInt(alpha), alpha += alphaStep);
+ }
+ else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
+ const GLfixed alphaStep = span->alphaStep;
+ GLfixed alpha = span->alpha;
+ GLushort ref;
+ CLAMPED_FLOAT_TO_USHORT(ref, ctx->Color.AlphaRef);
+ ALPHA_TEST(FixedToInt(alpha), alpha += alphaStep);
+ }
+ else {
+ const GLfloat alphaStep = FixedToFloat(span->alphaStep);
+ GLfloat alpha = FixedToFloat(span->alpha);
+ const GLfloat ref = ctx->Color.AlphaRef;
+ ALPHA_TEST(alpha, alpha += alphaStep);
+ }
+ }