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Diffstat (limited to 'nx-X11/extras/Mesa/src/mesa/swrast/s_blend.c')
-rw-r--r--nx-X11/extras/Mesa/src/mesa/swrast/s_blend.c872
1 files changed, 0 insertions, 872 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_blend.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_blend.c
deleted file mode 100644
index d94ff3923..000000000
--- a/nx-X11/extras/Mesa/src/mesa/swrast/s_blend.c
+++ /dev/null
@@ -1,872 +0,0 @@
-/*
- * Mesa 3-D graphics library
- * Version: 6.3
- *
- * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-/*
- * Regarding GL_NV_blend_square:
- *
- * Portions of this software may use or implement intellectual
- * property owned and licensed by NVIDIA Corporation. NVIDIA disclaims
- * any and all warranties with respect to such intellectual property,
- * including any use thereof or modifications thereto.
- */
-
-
-#include "glheader.h"
-#include "context.h"
-#include "colormac.h"
-#include "macros.h"
-
-#include "s_blend.h"
-#include "s_context.h"
-#include "s_span.h"
-
-
-#if defined(USE_MMX_ASM)
-#include "x86/mmx.h"
-#include "x86/common_x86_asm.h"
-#define _BLENDAPI _ASMAPI
-#else
-#define _BLENDAPI
-#endif
-
-
-/*
- * Special case for glBlendFunc(GL_ZERO, GL_ONE)
- */
-static void _BLENDAPI
-blend_noop( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
-{
- GLuint i;
- ASSERT(ctx->Color.BlendEquationRGB==GL_FUNC_ADD);
- ASSERT(ctx->Color.BlendEquationA==GL_FUNC_ADD);
- ASSERT(ctx->Color.BlendSrcRGB==GL_ZERO);
- ASSERT(ctx->Color.BlendDstRGB==GL_ONE);
- (void) ctx;
-
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- COPY_CHAN4( rgba[i], dest[i] );
- }
- }
-}
-
-
-/*
- * Special case for glBlendFunc(GL_ONE, GL_ZERO)
- */
-static void _BLENDAPI
-blend_replace( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
-{
- ASSERT(ctx->Color.BlendEquationRGB==GL_FUNC_ADD);
- ASSERT(ctx->Color.BlendEquationA==GL_FUNC_ADD);
- ASSERT(ctx->Color.BlendSrcRGB==GL_ONE);
- ASSERT(ctx->Color.BlendDstRGB==GL_ZERO);
- (void) ctx;
- (void) n;
- (void) mask;
- (void) rgba;
- (void) dest;
-}
-
-
-/*
- * Common transparency blending mode.
- */
-static void _BLENDAPI
-blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
-{
- GLuint i;
- ASSERT(ctx->Color.BlendEquationRGB==GL_FUNC_ADD);
- ASSERT(ctx->Color.BlendEquationA==GL_FUNC_ADD);
- ASSERT(ctx->Color.BlendSrcRGB==GL_SRC_ALPHA);
- ASSERT(ctx->Color.BlendDstRGB==GL_ONE_MINUS_SRC_ALPHA);
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- const GLchan t = rgba[i][ACOMP]; /* t in [0, CHAN_MAX] */
- if (t == 0) {
- /* 0% alpha */
- rgba[i][RCOMP] = dest[i][RCOMP];
- rgba[i][GCOMP] = dest[i][GCOMP];
- rgba[i][BCOMP] = dest[i][BCOMP];
- rgba[i][ACOMP] = dest[i][ACOMP];
- }
- else if (t == CHAN_MAX) {
- /* 100% alpha, no-op */
- }
- else {
-#if 0
- /* This is pretty close, but Glean complains */
- const GLint s = CHAN_MAX - t;
- const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s + 1) >> 8;
- const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s + 1) >> 8;
- const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s + 1) >> 8;
- const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s + 1) >> 8;
-#elif 0
- /* This is slower but satisfies Glean */
- const GLint s = CHAN_MAX - t;
- const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) / 255;
- const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) / 255;
- const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) / 255;
- const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) / 255;
-#else
-#if CHAN_BITS == 8
- /* This satisfies Glean and should be reasonably fast */
- /* Contributed by Nathan Hand */
-#if 0
-#define DIV255(X) (((X) << 8) + (X) + 256) >> 16
-#else
- GLint temp;
-#define DIV255(X) (temp = (X), ((temp << 8) + temp + 256) >> 16)
-#endif
- const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP];
- const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP];
- const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP];
- const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP];
-
-#undef DIV255
-#elif CHAN_BITS == 16
- const GLfloat tt = (GLfloat) t / CHAN_MAXF;
- const GLint r = (GLint) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]);
- const GLint g = (GLint) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]);
- const GLint b = (GLint) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]);
- const GLint a = (GLint) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]);
-#else /* CHAN_BITS == 32 */
- const GLfloat tt = (GLfloat) t / CHAN_MAXF;
- const GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP];
- const GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP];
- const GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP];
- const GLfloat a = CLAMP( rgba[i][ACOMP], 0.0F, CHAN_MAXF ) * t +
- CLAMP( dest[i][ACOMP], 0.0F, CHAN_MAXF ) * (1.0F - t);
-#endif
-#endif
- ASSERT(r <= CHAN_MAX);
- ASSERT(g <= CHAN_MAX);
- ASSERT(b <= CHAN_MAX);
- ASSERT(a <= CHAN_MAX);
- rgba[i][RCOMP] = (GLchan) r;
- rgba[i][GCOMP] = (GLchan) g;
- rgba[i][BCOMP] = (GLchan) b;
- rgba[i][ACOMP] = (GLchan) a;
- }
- }
- }
-}
-
-
-
-/*
- * Add src and dest.
- */
-static void _BLENDAPI
-blend_add( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
-{
- GLuint i;
- ASSERT(ctx->Color.BlendEquationRGB==GL_FUNC_ADD);
- ASSERT(ctx->Color.BlendEquationA==GL_FUNC_ADD);
- ASSERT(ctx->Color.BlendSrcRGB==GL_ONE);
- ASSERT(ctx->Color.BlendDstRGB==GL_ONE);
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
-#if CHAN_TYPE == GL_FLOAT
- /* don't RGB clamp to max */
- GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF) + dest[i][ACOMP];
- rgba[i][RCOMP] += dest[i][RCOMP];
- rgba[i][GCOMP] += dest[i][GCOMP];
- rgba[i][BCOMP] += dest[i][BCOMP];
- rgba[i][ACOMP] = (GLchan) MIN2( a, CHAN_MAXF );
-#else
- GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
- GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
- GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
- GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
- rgba[i][RCOMP] = (GLchan) MIN2( r, CHAN_MAX );
- rgba[i][GCOMP] = (GLchan) MIN2( g, CHAN_MAX );
- rgba[i][BCOMP] = (GLchan) MIN2( b, CHAN_MAX );
- rgba[i][ACOMP] = (GLchan) MIN2( a, CHAN_MAX );
-#endif
- }
- }
-}
-
-
-
-/*
- * Blend min function (for GL_EXT_blend_minmax)
- */
-static void _BLENDAPI
-blend_min( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
-{
- GLuint i;
- ASSERT(ctx->Color.BlendEquationRGB==GL_MIN);
- ASSERT(ctx->Color.BlendEquationA==GL_MIN);
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = (GLchan) MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = (GLchan) MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = (GLchan) MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = (GLchan) MIN2(CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF),
- dest[i][ACOMP]);
-#else
- rgba[i][ACOMP] = (GLchan) MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
-#endif
- }
- }
-}
-
-
-
-/*
- * Blend max function (for GL_EXT_blend_minmax)
- */
-static void _BLENDAPI
-blend_max( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
-{
- GLuint i;
- ASSERT(ctx->Color.BlendEquationRGB==GL_MAX);
- ASSERT(ctx->Color.BlendEquationA==GL_MAX);
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = (GLchan) MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = (GLchan) MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = (GLchan) MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = (GLchan) MAX2(CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF),
- dest[i][ACOMP]);
-#else
- rgba[i][ACOMP] = (GLchan) MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
-#endif
- }
- }
-}
-
-
-
-/*
- * Modulate: result = src * dest
- */
-static void _BLENDAPI
-blend_modulate( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
-{
- GLuint i;
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][RCOMP] = rgba[i][RCOMP] * dest[i][RCOMP];
- rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP];
- rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP];
- rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP];
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- GLint r = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16;
- GLint g = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16;
- GLint b = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16;
- GLint a = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16;
- rgba[i][RCOMP] = (GLchan) r;
- rgba[i][GCOMP] = (GLchan) g;
- rgba[i][BCOMP] = (GLchan) b;
- rgba[i][ACOMP] = (GLchan) a;
-#else
- GLint r = (rgba[i][RCOMP] * dest[i][RCOMP] + 255) >> 8;
- GLint g = (rgba[i][GCOMP] * dest[i][GCOMP] + 255) >> 8;
- GLint b = (rgba[i][BCOMP] * dest[i][BCOMP] + 255) >> 8;
- GLint a = (rgba[i][ACOMP] * dest[i][ACOMP] + 255) >> 8;
- rgba[i][RCOMP] = (GLchan) r;
- rgba[i][GCOMP] = (GLchan) g;
- rgba[i][BCOMP] = (GLchan) b;
- rgba[i][ACOMP] = (GLchan) a;
-#endif
- }
- }
-}
-
-
-
-/*
- * General case blend pixels.
- * Input: n - number of pixels
- * mask - the usual write mask
- * In/Out: rgba - the incoming and modified pixels
- * Input: dest - the pixels from the dest color buffer
- */
-static void _BLENDAPI
-blend_general( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
-{
- 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 do_blend");
- 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 do_blend");
- }
-
- /* 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 do_blend");
- }
-
- /* 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 do_blend");
- 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
- if (ctx->Color.BlendEquationRGB==GL_FUNC_ADD) {
- r = Rs * sR + Rd * dR;
- g = Gs * sG + Gd * dG;
- b = Bs * sB + Bd * dB;
- a = As * sA + Ad * dA;
- }
- else if (ctx->Color.BlendEquationRGB==GL_FUNC_SUBTRACT) {
- r = Rs * sR - Rd * dR;
- g = Gs * sG - Gd * dG;
- b = Bs * sB - Bd * dB;
- a = As * sA - Ad * dA;
- }
- else if (ctx->Color.BlendEquationRGB==GL_FUNC_REVERSE_SUBTRACT) {
- r = Rd * dR - Rs * sR;
- g = Gd * dG - Gs * sG;
- b = Bd * dB - Bs * sB;
- a = Ad * dA - As * sA;
- }
- else if (ctx->Color.BlendEquationRGB==GL_MIN) {
- r = MIN2( Rd, Rs );
- g = MIN2( Gd, Gs );
- b = MIN2( Bd, Bs );
- }
- else if (ctx->Color.BlendEquationRGB==GL_MAX) {
- r = MAX2( Rd, Rs );
- g = MAX2( Gd, Gs );
- b = MAX2( Bd, Bs );
- }
- else {
- /* should never get here */
- r = g = b = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- }
-
- if (ctx->Color.BlendEquationA==GL_FUNC_ADD) {
- a = As * sA + Ad * dA;
- }
- else if (ctx->Color.BlendEquationA==GL_FUNC_SUBTRACT) {
- a = As * sA - Ad * dA;
- }
- else if (ctx->Color.BlendEquationA==GL_FUNC_REVERSE_SUBTRACT) {
- a = Ad * dA - As * sA;
- }
- else if (ctx->Color.BlendEquationA==GL_MIN) {
- a = MIN2( Ad, As );
- }
- else if (ctx->Color.BlendEquationA==GL_MAX) {
- a = MAX2( Ad, As );
- }
- else {
- /* should never get here */
- a = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- }
-
- /* 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
- if (ctx->Color.BlendEquationRGB==GL_FUNC_ADD) {
- r = Rs * sR + Rd * dR + 0.5F;
- g = Gs * sG + Gd * dG + 0.5F;
- b = Bs * sB + Bd * dB + 0.5F;
- }
- else if (ctx->Color.BlendEquationRGB==GL_FUNC_SUBTRACT) {
- r = Rs * sR - Rd * dR + 0.5F;
- g = Gs * sG - Gd * dG + 0.5F;
- b = Bs * sB - Bd * dB + 0.5F;
- }
- else if (ctx->Color.BlendEquationRGB==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;
- }
- else if (ctx->Color.BlendEquationRGB==GL_MIN) {
- r = MIN2( Rd, Rs );
- g = MIN2( Gd, Gs );
- b = MIN2( Bd, Bs );
- }
- else if (ctx->Color.BlendEquationRGB==GL_MAX) {
- r = MAX2( Rd, Rs );
- g = MAX2( Gd, Gs );
- b = MAX2( Bd, Bs );
- }
- else {
- /* should never get here */
- r = g = b = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- }
-
- if (ctx->Color.BlendEquationA==GL_FUNC_ADD) {
- a = As * sA + Ad * dA + 0.5F;
- }
- else if (ctx->Color.BlendEquationA==GL_FUNC_SUBTRACT) {
- a = As * sA - Ad * dA + 0.5F;
- }
- else if (ctx->Color.BlendEquationA==GL_FUNC_REVERSE_SUBTRACT) {
- a = Ad * dA - As * sA + 0.5F;
- }
- else if (ctx->Color.BlendEquationA==GL_MIN) {
- a = MIN2( Ad, As );
- }
- else if (ctx->Color.BlendEquationA==GL_MAX) {
- a = MAX2( Ad, As );
- }
- else {
- /* should never get here */
- a = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- }
-
- /* final clamping */
- rgba[i][RCOMP] = (GLchan) (GLint) CLAMP( r, 0.0F, CHAN_MAXF );
- rgba[i][GCOMP] = (GLchan) (GLint) CLAMP( g, 0.0F, CHAN_MAXF );
- rgba[i][BCOMP] = (GLchan) (GLint) CLAMP( b, 0.0F, CHAN_MAXF );
- rgba[i][ACOMP] = (GLchan) (GLint) CLAMP( a, 0.0F, CHAN_MAXF );
-#endif
- }
- }
-}
-
-
-/*
- * Analyze current blending parameters to pick fastest blending function.
- * Result: the ctx->Color.BlendFunc pointer is updated.
- */
-void _swrast_choose_blend_func( GLcontext *ctx )
-{
- const GLenum eq = ctx->Color.BlendEquationRGB;
- const GLenum srcRGB = ctx->Color.BlendSrcRGB;
- const GLenum dstRGB = ctx->Color.BlendDstRGB;
- const GLenum srcA = ctx->Color.BlendSrcA;
- const GLenum dstA = ctx->Color.BlendDstA;
-
- if (ctx->Color.BlendEquationRGB != ctx->Color.BlendEquationA) {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_general;
- }
- else if (eq==GL_MIN) {
- /* Note: GL_MIN ignores the blending weight factors */
-#if defined(USE_MMX_ASM)
- if ( cpu_has_mmx ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_min;
- }
- else
-#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_min;
- }
- else if (eq==GL_MAX) {
- /* Note: GL_MAX ignores the blending weight factors */
-#if defined(USE_MMX_ASM)
- if ( cpu_has_mmx ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_max;
- }
- else
-#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_max;
- }
- else if (srcRGB != srcA || dstRGB != dstA) {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_general;
- }
- else if (eq==GL_FUNC_ADD && srcRGB==GL_SRC_ALPHA
- && dstRGB==GL_ONE_MINUS_SRC_ALPHA) {
-#if defined(USE_MMX_ASM)
- if ( cpu_has_mmx ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_transparency;
- }
- else
-#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_transparency;
- }
- else if (eq==GL_FUNC_ADD && srcRGB==GL_ONE && dstRGB==GL_ONE) {
-#if defined(USE_MMX_ASM)
- if ( cpu_has_mmx ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_add;
- }
- else
-#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_add;
- }
- else if (((eq==GL_FUNC_ADD || eq==GL_FUNC_REVERSE_SUBTRACT)
- && (srcRGB==GL_ZERO && dstRGB==GL_SRC_COLOR))
- ||
- ((eq==GL_FUNC_ADD || eq==GL_FUNC_SUBTRACT)
- && (srcRGB==GL_DST_COLOR && dstRGB==GL_ZERO))) {
-#if defined(USE_MMX_ASM)
- if ( cpu_has_mmx ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_modulate;
- }
- else
-#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_modulate;
- }
- else if (eq==GL_FUNC_ADD && srcRGB == GL_ZERO && dstRGB == GL_ONE) {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_noop;
- }
- else if (eq==GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ZERO) {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_replace;
- }
- else {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_general;
- }
-}
-
-
-
-/*
- * Apply the blending operator to a span of pixels.
- * We can handle horizontal runs of pixels (spans) or arrays of x/y
- * pixel coordinates.
- */
-void
-_swrast_blend_span(GLcontext *ctx, struct gl_renderbuffer *rb,
- const struct sw_span *span, GLchan rgba[][4])
-{
- GLchan framebuffer[MAX_WIDTH][4];
-
- ASSERT(span->end <= MAX_WIDTH);
- ASSERT(span->arrayMask & SPAN_RGBA);
- ASSERT(!ctx->Color._LogicOpEnabled);
-
- /* Read span of current frame buffer pixels */
- if (span->arrayMask & SPAN_XY) {
- /* array of x/y pixel coords */
- _swrast_get_values(ctx, rb, span->end, span->array->x, span->array->y,
- framebuffer, 4 * sizeof(GLchan));
- }
- else {
- /* horizontal run of pixels */
- _swrast_read_rgba_span(ctx, rb, span->end, span->x, span->y,
- framebuffer);
- }
-
- SWRAST_CONTEXT(ctx)->BlendFunc( ctx, span->end, span->array->mask, rgba,
- (const GLchan (*)[4]) framebuffer );
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 20:32:32 +0000