-#endif
-
-
-static void _BLENDAPI
-blend_general(GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4],
- GLenum chanType)
-{
- const GLfloat rscale = 1.0F / CHAN_MAXF;
- const GLfloat gscale = 1.0F / CHAN_MAXF;
- const GLfloat bscale = 1.0F / CHAN_MAXF;
- const GLfloat ascale = 1.0F / CHAN_MAXF;
- GLuint i;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
-#if CHAN_TYPE == GL_FLOAT
- GLfloat Rs, Gs, Bs, As; /* Source colors */
- GLfloat Rd, Gd, Bd, Ad; /* Dest colors */
-#else
- GLint Rs, Gs, Bs, As; /* Source colors */
- GLint Rd, Gd, Bd, Ad; /* Dest colors */
-#endif
- GLfloat sR, sG, sB, sA; /* Source scaling */
- GLfloat dR, dG, dB, dA; /* Dest scaling */
- GLfloat r, g, b, a; /* result color */
-
- /* Incoming/source Color */
- Rs = rgba[i][RCOMP];
- Gs = rgba[i][GCOMP];
- Bs = rgba[i][BCOMP];
- As = rgba[i][ACOMP];
-#if CHAN_TYPE == GL_FLOAT
- /* clamp */
- Rs = MIN2(Rs, CHAN_MAXF);
- Gs = MIN2(Gs, CHAN_MAXF);
- Bs = MIN2(Bs, CHAN_MAXF);
- As = MIN2(As, CHAN_MAXF);
-#endif
-
- /* Frame buffer/dest color */
- Rd = dest[i][RCOMP];
- Gd = dest[i][GCOMP];
- Bd = dest[i][BCOMP];
- Ad = dest[i][ACOMP];
-#if CHAN_TYPE == GL_FLOAT
- /* clamp */
- Rd = MIN2(Rd, CHAN_MAXF);
- Gd = MIN2(Gd, CHAN_MAXF);
- Bd = MIN2(Bd, CHAN_MAXF);
- Ad = MIN2(Ad, CHAN_MAXF);
-#endif
-
- /* Source RGB factor */
- switch (ctx->Color.BlendSrcRGB) {
- case GL_ZERO:
- sR = sG = sB = 0.0F;
- break;
- case GL_ONE:
- sR = sG = sB = 1.0F;
- break;
- case GL_DST_COLOR:
- sR = (GLfloat) Rd * rscale;
- sG = (GLfloat) Gd * gscale;
- sB = (GLfloat) Bd * bscale;
- break;
- case GL_ONE_MINUS_DST_COLOR:
- sR = 1.0F - (GLfloat) Rd * rscale;
- sG = 1.0F - (GLfloat) Gd * gscale;
- sB = 1.0F - (GLfloat) Bd * bscale;
- break;
- case GL_SRC_ALPHA:
- sR = sG = sB = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- sR = sG = sB = 1.0F - (GLfloat) As * ascale;
- break;
- case GL_DST_ALPHA:
- sR = sG = sB = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
- break;
- case GL_SRC_ALPHA_SATURATE:
- if (As < CHAN_MAX - Ad) {
- sR = sG = sB = (GLfloat) As * ascale;
- }
- else {
- sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
- }
- break;
- case GL_CONSTANT_COLOR:
- sR = ctx->Color.BlendColor[0];
- sG = ctx->Color.BlendColor[1];
- sB = ctx->Color.BlendColor[2];
- break;
- case GL_ONE_MINUS_CONSTANT_COLOR:
- sR = 1.0F - ctx->Color.BlendColor[0];
- sG = 1.0F - ctx->Color.BlendColor[1];
- sB = 1.0F - ctx->Color.BlendColor[2];
- break;
- case GL_CONSTANT_ALPHA:
- sR = sG = sB = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- sR = sG = sB = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_SRC_COLOR: /* GL_NV_blend_square */
- sR = (GLfloat) Rs * rscale;
- sG = (GLfloat) Gs * gscale;
- sB = (GLfloat) Bs * bscale;
- break;
- case GL_ONE_MINUS_SRC_COLOR: /* GL_NV_blend_square */
- sR = 1.0F - (GLfloat) Rs * rscale;
- sG = 1.0F - (GLfloat) Gs * gscale;
- sB = 1.0F - (GLfloat) Bs * bscale;
- break;
- default:
- /* this should never happen */
- _mesa_problem(ctx, "Bad blend source RGB factor in blend_general");
- return;
- }
-
- /* Source Alpha factor */
- switch (ctx->Color.BlendSrcA) {
- case GL_ZERO:
- sA = 0.0F;
- break;
- case GL_ONE:
- sA = 1.0F;
- break;
- case GL_DST_COLOR:
- sA = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_COLOR:
- sA = 1.0F - (GLfloat) Ad * ascale;
- break;
- case GL_SRC_ALPHA:
- sA = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- sA = 1.0F - (GLfloat) As * ascale;
- break;
- case GL_DST_ALPHA:
- sA = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- sA = 1.0F - (GLfloat) Ad * ascale;
- break;
- case GL_SRC_ALPHA_SATURATE:
- sA = 1.0;
- break;
- case GL_CONSTANT_COLOR:
- sA = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_COLOR:
- sA = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_CONSTANT_ALPHA:
- sA = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- sA = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_SRC_COLOR: /* GL_NV_blend_square */
- sA = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_COLOR: /* GL_NV_blend_square */
- sA = 1.0F - (GLfloat) As * ascale;
- break;
- default:
- /* this should never happen */
- sA = 0.0F;
- _mesa_problem(ctx, "Bad blend source A factor in blend_general");
- return;
- }
-
- /* Dest RGB factor */
- switch (ctx->Color.BlendDstRGB) {
- case GL_ZERO:
- dR = dG = dB = 0.0F;
- break;
- case GL_ONE:
- dR = dG = dB = 1.0F;
- break;
- case GL_SRC_COLOR:
- dR = (GLfloat) Rs * rscale;
- dG = (GLfloat) Gs * gscale;
- dB = (GLfloat) Bs * bscale;
- break;
- case GL_ONE_MINUS_SRC_COLOR:
- dR = 1.0F - (GLfloat) Rs * rscale;
- dG = 1.0F - (GLfloat) Gs * gscale;
- dB = 1.0F - (GLfloat) Bs * bscale;
- break;
- case GL_SRC_ALPHA:
- dR = dG = dB = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- dR = dG = dB = 1.0F - (GLfloat) As * ascale;
- break;
- case GL_DST_ALPHA:
- dR = dG = dB = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- dR = dG = dB = 1.0F - (GLfloat) Ad * ascale;
- break;
- case GL_CONSTANT_COLOR:
- dR = ctx->Color.BlendColor[0];
- dG = ctx->Color.BlendColor[1];
- dB = ctx->Color.BlendColor[2];
- break;
- case GL_ONE_MINUS_CONSTANT_COLOR:
- dR = 1.0F - ctx->Color.BlendColor[0];
- dG = 1.0F - ctx->Color.BlendColor[1];
- dB = 1.0F - ctx->Color.BlendColor[2];
- break;
- case GL_CONSTANT_ALPHA:
- dR = dG = dB = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- dR = dG = dB = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_DST_COLOR: /* GL_NV_blend_square */
- dR = (GLfloat) Rd * rscale;
- dG = (GLfloat) Gd * gscale;
- dB = (GLfloat) Bd * bscale;
- break;
- case GL_ONE_MINUS_DST_COLOR: /* GL_NV_blend_square */
- dR = 1.0F - (GLfloat) Rd * rscale;
- dG = 1.0F - (GLfloat) Gd * gscale;
- dB = 1.0F - (GLfloat) Bd * bscale;
- break;
- default:
- /* this should never happen */
- dR = dG = dB = 0.0F;
- _mesa_problem(ctx, "Bad blend dest RGB factor in blend_general");
- return;
- }
-
- /* Dest Alpha factor */
- switch (ctx->Color.BlendDstA) {
- case GL_ZERO:
- dA = 0.0F;
- break;
- case GL_ONE:
- dA = 1.0F;
- break;
- case GL_SRC_COLOR:
- dA = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_COLOR:
- dA = 1.0F - (GLfloat) As * ascale;
- break;
- case GL_SRC_ALPHA:
- dA = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- dA = 1.0F - (GLfloat) As * ascale;
- break;
- case GL_DST_ALPHA:
- dA = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- dA = 1.0F - (GLfloat) Ad * ascale;
- break;
- case GL_CONSTANT_COLOR:
- dA = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_COLOR:
- dA = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_CONSTANT_ALPHA:
- dA = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- dA = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_DST_COLOR: /* GL_NV_blend_square */
- dA = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_COLOR: /* GL_NV_blend_square */
- dA = 1.0F - (GLfloat) Ad * ascale;
- break;
- default:
- /* this should never happen */
- dA = 0.0F;
- _mesa_problem(ctx, "Bad blend dest A factor in blend_general");
- return;
- }
-
- /* Due to round-off problems we have to clamp against zero. */
- /* Optimization: we don't have to do this for all src & dst factors */
- if (dA < 0.0F) dA = 0.0F;
- if (dR < 0.0F) dR = 0.0F;
- if (dG < 0.0F) dG = 0.0F;
- if (dB < 0.0F) dB = 0.0F;
- if (sA < 0.0F) sA = 0.0F;
- if (sR < 0.0F) sR = 0.0F;
- if (sG < 0.0F) sG = 0.0F;
- if (sB < 0.0F) sB = 0.0F;
-
- ASSERT( sR <= 1.0 );
- ASSERT( sG <= 1.0 );
- ASSERT( sB <= 1.0 );
- ASSERT( sA <= 1.0 );
- ASSERT( dR <= 1.0 );
- ASSERT( dG <= 1.0 );
- ASSERT( dB <= 1.0 );
- ASSERT( dA <= 1.0 );
-
- /* compute blended color */
-#if CHAN_TYPE == GL_FLOAT
- switch (ctx->Color.BlendEquationRGB) {
- case GL_FUNC_ADD:
- r = Rs * sR + Rd * dR;
- g = Gs * sG + Gd * dG;
- b = Bs * sB + Bd * dB;
- a = As * sA + Ad * dA;
- break;
- case GL_FUNC_SUBTRACT:
- r = Rs * sR - Rd * dR;
- g = Gs * sG - Gd * dG;
- b = Bs * sB - Bd * dB;
- a = As * sA - Ad * dA;
- break;
- case GL_FUNC_REVERSE_SUBTRACT:
- r = Rd * dR - Rs * sR;
- g = Gd * dG - Gs * sG;
- b = Bd * dB - Bs * sB;
- a = Ad * dA - As * sA;
- break;
- case GL_MIN:
- r = MIN2( Rd, Rs );
- g = MIN2( Gd, Gs );
- b = MIN2( Bd, Bs );
- break;
- case GL_MAX:
- r = MAX2( Rd, Rs );
- g = MAX2( Gd, Gs );
- b = MAX2( Bd, Bs );
- break;
- default:
- /* should never get here */
- r = g = b = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- return;
- }
-
- switch (ctx->Color.BlendEquationA) {
- case GL_FUNC_ADD:
- a = As * sA + Ad * dA;
- break;
- case GL_FUNC_SUBTRACT:
- a = As * sA - Ad * dA;
- break;
- case GL_FUNC_REVERSE_SUBTRACT:
- a = Ad * dA - As * sA;
- break;
- case GL_MIN:
- a = MIN2( Ad, As );
- break;
- case GL_MAX:
- a = MAX2( Ad, As );
- break;
- default:
- /* should never get here */
- a = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- return;
- }
-
- /* final clamping */
- rgba[i][RCOMP] = MAX2( r, 0.0F );
- rgba[i][GCOMP] = MAX2( g, 0.0F );
- rgba[i][BCOMP] = MAX2( b, 0.0F );
- rgba[i][ACOMP] = CLAMP( a, 0.0F, CHAN_MAXF );
-#else
- switch (ctx->Color.BlendEquationRGB) {
- case GL_FUNC_ADD:
- r = Rs * sR + Rd * dR + 0.5F;
- g = Gs * sG + Gd * dG + 0.5F;
- b = Bs * sB + Bd * dB + 0.5F;
- break;
- case GL_FUNC_SUBTRACT:
- r = Rs * sR - Rd * dR + 0.5F;
- g = Gs * sG - Gd * dG + 0.5F;
- b = Bs * sB - Bd * dB + 0.5F;
- break;
- case GL_FUNC_REVERSE_SUBTRACT:
- r = Rd * dR - Rs * sR + 0.5F;
- g = Gd * dG - Gs * sG + 0.5F;
- b = Bd * dB - Bs * sB + 0.5F;
- break;
- case GL_MIN:
- r = MIN2( Rd, Rs );
- g = MIN2( Gd, Gs );
- b = MIN2( Bd, Bs );
- break;
- case GL_MAX:
- r = MAX2( Rd, Rs );
- g = MAX2( Gd, Gs );
- b = MAX2( Bd, Bs );
- break;
- default:
- /* should never get here */
- r = g = b = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- return;
- }
-
- switch (ctx->Color.BlendEquationA) {
- case GL_FUNC_ADD:
- a = As * sA + Ad * dA + 0.5F;
- break;
- case GL_FUNC_SUBTRACT:
- a = As * sA - Ad * dA + 0.5F;
- break;
- case GL_FUNC_REVERSE_SUBTRACT:
- a = Ad * dA - As * sA + 0.5F;
- break;
- case GL_MIN:
- a = MIN2( Ad, As );
- break;
- case GL_MAX:
- a = MAX2( Ad, As );
- break;
- default:
- /* should never get here */
- a = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- return;
- }