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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 72 | giacomo | 1 | /* $Id: s_blend.c,v 1.2 2003-03-13 12:20:29 giacomo Exp $ */ |
| 57 | pj | 2 | |
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 4.1 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 10 | * copy of this software and associated documentation files (the "Software"), |
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| 11 | * to deal in the Software without restriction, including without limitation |
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 14 | * Software is furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included |
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| 17 | * in all copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | */ |
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| 26 | |||
| 27 | |||
| 28 | |||
| 29 | #include "glheader.h" |
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| 30 | #include "context.h" |
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| 31 | #include "colormac.h" |
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| 32 | #include "macros.h" |
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| 33 | |||
| 34 | #include "s_alphabuf.h" |
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| 35 | #include "s_blend.h" |
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| 36 | #include "s_context.h" |
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| 37 | #include "s_span.h" |
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| 38 | |||
| 39 | |||
| 40 | #if defined(USE_MMX_ASM) |
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| 72 | giacomo | 41 | #include "x86/mmx.h" |
| 42 | #include "x86/common_x86_asm.h" |
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| 57 | pj | 43 | #define _BLENDAPI _ASMAPI |
| 44 | #else |
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| 45 | #define _BLENDAPI |
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| 46 | #endif |
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| 47 | |||
| 48 | |||
| 49 | /* |
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| 50 | * Special case for glBlendFunc(GL_ZERO, GL_ONE) |
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| 51 | */ |
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| 52 | static void _BLENDAPI |
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| 53 | blend_noop( GLcontext *ctx, GLuint n, const GLubyte mask[], |
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| 54 | GLchan rgba[][4], CONST GLchan dest[][4] ) |
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| 55 | { |
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| 56 | GLuint i; |
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| 57 | ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT); |
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| 58 | ASSERT(ctx->Color.BlendSrcRGB==GL_ZERO); |
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| 59 | ASSERT(ctx->Color.BlendDstRGB==GL_ONE); |
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| 60 | (void) ctx; |
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| 61 | |||
| 62 | for (i = 0; i < n; i++) { |
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| 63 | if (mask[i]) { |
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| 64 | COPY_CHAN4( rgba[i], dest[i] ); |
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| 65 | } |
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| 66 | } |
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| 67 | } |
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| 68 | |||
| 69 | |||
| 70 | /* |
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| 71 | * Special case for glBlendFunc(GL_ONE, GL_ZERO) |
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| 72 | */ |
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| 73 | static void _BLENDAPI |
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| 74 | blend_replace( GLcontext *ctx, GLuint n, const GLubyte mask[], |
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| 75 | GLchan rgba[][4], CONST GLchan dest[][4] ) |
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| 76 | { |
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| 77 | ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT); |
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| 78 | ASSERT(ctx->Color.BlendSrcRGB==GL_ONE); |
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| 79 | ASSERT(ctx->Color.BlendDstRGB==GL_ZERO); |
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| 80 | (void) ctx; |
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| 81 | (void) n; |
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| 82 | (void) mask; |
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| 83 | (void) rgba; |
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| 84 | (void) dest; |
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| 85 | } |
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| 86 | |||
| 87 | |||
| 88 | /* |
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| 89 | * Common transparency blending mode. |
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| 90 | */ |
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| 91 | static void _BLENDAPI |
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| 92 | blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[], |
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| 93 | GLchan rgba[][4], CONST GLchan dest[][4] ) |
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| 94 | { |
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| 95 | GLuint i; |
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| 96 | ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT); |
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| 97 | ASSERT(ctx->Color.BlendSrcRGB==GL_SRC_ALPHA); |
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| 98 | ASSERT(ctx->Color.BlendDstRGB==GL_ONE_MINUS_SRC_ALPHA); |
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| 99 | (void) ctx; |
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| 100 | |||
| 101 | for (i=0;i<n;i++) { |
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| 102 | if (mask[i]) { |
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| 103 | const GLchan t = rgba[i][ACOMP]; /* t in [0, CHAN_MAX] */ |
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| 104 | if (t == 0) { |
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| 105 | /* 0% alpha */ |
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| 106 | rgba[i][RCOMP] = dest[i][RCOMP]; |
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| 107 | rgba[i][GCOMP] = dest[i][GCOMP]; |
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| 108 | rgba[i][BCOMP] = dest[i][BCOMP]; |
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| 109 | rgba[i][ACOMP] = dest[i][ACOMP]; |
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| 110 | } |
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| 111 | else if (t == CHAN_MAX) { |
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| 112 | /* 100% alpha, no-op */ |
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| 113 | } |
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| 114 | else { |
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| 115 | #if 0 |
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| 116 | /* This is pretty close, but Glean complains */ |
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| 117 | const GLint s = CHAN_MAX - t; |
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| 118 | const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s + 1) >> 8; |
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| 119 | const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s + 1) >> 8; |
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| 120 | const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s + 1) >> 8; |
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| 121 | const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s + 1) >> 8; |
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| 122 | #elif 0 |
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| 123 | /* This is slower but satisfies Glean */ |
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| 124 | const GLint s = CHAN_MAX - t; |
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| 125 | const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) / 255; |
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| 126 | const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) / 255; |
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| 127 | const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) / 255; |
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| 128 | const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) / 255; |
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| 129 | #else |
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| 130 | #if CHAN_BITS == 8 |
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| 131 | /* This satisfies Glean and should be reasonably fast */ |
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| 132 | /* Contributed by Nathan Hand */ |
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| 133 | #if 0 |
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| 134 | #define DIV255(X) (((X) << 8) + (X) + 256) >> 16 |
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| 135 | #else |
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| 136 | GLint temp; |
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| 137 | #define DIV255(X) (temp = (X), ((temp << 8) + temp + 256) >> 16) |
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| 138 | #endif |
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| 139 | const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP]; |
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| 140 | const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP]; |
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| 141 | const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP]; |
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| 142 | const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP]; |
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| 143 | |||
| 144 | #undef DIV255 |
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| 145 | #elif CHAN_BITS == 16 |
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| 146 | const GLfloat tt = (GLfloat) t / CHAN_MAXF; |
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| 147 | const GLint r = (GLint) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]); |
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| 148 | const GLint g = (GLint) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]); |
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| 149 | const GLint b = (GLint) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]); |
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| 150 | const GLint a = (GLint) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]); |
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| 151 | #else /* CHAN_BITS == 32 */ |
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| 152 | const GLfloat tt = (GLfloat) t / CHAN_MAXF; |
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| 153 | const GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]; |
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| 154 | const GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]; |
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| 155 | const GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]; |
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| 156 | const GLfloat a = CLAMP( rgba[i][ACOMP], 0.0F, CHAN_MAXF ) * t + |
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| 157 | CLAMP( dest[i][ACOMP], 0.0F, CHAN_MAXF ) * (1.0F - t); |
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| 158 | #endif |
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| 159 | #endif |
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| 160 | ASSERT(r <= CHAN_MAX); |
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| 161 | ASSERT(g <= CHAN_MAX); |
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| 162 | ASSERT(b <= CHAN_MAX); |
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| 163 | ASSERT(a <= CHAN_MAX); |
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| 164 | rgba[i][RCOMP] = (GLchan) r; |
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| 165 | rgba[i][GCOMP] = (GLchan) g; |
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| 166 | rgba[i][BCOMP] = (GLchan) b; |
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| 167 | rgba[i][ACOMP] = (GLchan) a; |
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| 168 | } |
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| 169 | } |
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| 170 | } |
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| 171 | } |
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| 172 | |||
| 173 | |||
| 174 | |||
| 175 | /* |
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| 176 | * Add src and dest. |
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| 177 | */ |
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| 178 | static void _BLENDAPI |
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| 179 | blend_add( GLcontext *ctx, GLuint n, const GLubyte mask[], |
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| 180 | GLchan rgba[][4], CONST GLchan dest[][4] ) |
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| 181 | { |
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| 182 | GLuint i; |
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| 183 | ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT); |
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| 184 | ASSERT(ctx->Color.BlendSrcRGB==GL_ONE); |
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| 185 | ASSERT(ctx->Color.BlendDstRGB==GL_ONE); |
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| 186 | (void) ctx; |
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| 187 | |||
| 188 | for (i=0;i<n;i++) { |
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| 189 | if (mask[i]) { |
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| 190 | #if CHAN_TYPE == GL_FLOAT |
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| 191 | /* don't RGB clamp to max */ |
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| 192 | GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF) + dest[i][ACOMP]; |
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| 193 | rgba[i][RCOMP] += dest[i][RCOMP]; |
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| 194 | rgba[i][GCOMP] += dest[i][GCOMP]; |
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| 195 | rgba[i][BCOMP] += dest[i][BCOMP]; |
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| 196 | rgba[i][ACOMP] = (GLchan) MIN2( a, CHAN_MAXF ); |
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| 197 | #else |
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| 198 | GLint r = rgba[i][RCOMP] + dest[i][RCOMP]; |
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| 199 | GLint g = rgba[i][GCOMP] + dest[i][GCOMP]; |
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| 200 | GLint b = rgba[i][BCOMP] + dest[i][BCOMP]; |
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| 201 | GLint a = rgba[i][ACOMP] + dest[i][ACOMP]; |
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| 202 | rgba[i][RCOMP] = (GLchan) MIN2( r, CHAN_MAX ); |
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| 203 | rgba[i][GCOMP] = (GLchan) MIN2( g, CHAN_MAX ); |
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| 204 | rgba[i][BCOMP] = (GLchan) MIN2( b, CHAN_MAX ); |
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| 205 | rgba[i][ACOMP] = (GLchan) MIN2( a, CHAN_MAX ); |
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| 206 | #endif |
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| 207 | } |
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| 208 | } |
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| 209 | } |
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| 210 | |||
| 211 | |||
| 212 | |||
| 213 | /* |
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| 214 | * Blend min function (for GL_EXT_blend_minmax) |
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| 215 | */ |
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| 216 | static void _BLENDAPI |
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| 217 | blend_min( GLcontext *ctx, GLuint n, const GLubyte mask[], |
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| 218 | GLchan rgba[][4], CONST GLchan dest[][4] ) |
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| 219 | { |
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| 220 | GLuint i; |
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| 221 | ASSERT(ctx->Color.BlendEquation==GL_MIN_EXT); |
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| 222 | (void) ctx; |
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| 223 | |||
| 224 | for (i=0;i<n;i++) { |
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| 225 | if (mask[i]) { |
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| 226 | rgba[i][RCOMP] = (GLchan) MIN2( rgba[i][RCOMP], dest[i][RCOMP] ); |
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| 227 | rgba[i][GCOMP] = (GLchan) MIN2( rgba[i][GCOMP], dest[i][GCOMP] ); |
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| 228 | rgba[i][BCOMP] = (GLchan) MIN2( rgba[i][BCOMP], dest[i][BCOMP] ); |
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| 229 | #if CHAN_TYPE == GL_FLOAT |
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| 230 | rgba[i][ACOMP] = (GLchan) MIN2(CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF), |
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| 231 | dest[i][ACOMP]); |
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| 232 | #else |
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| 233 | rgba[i][ACOMP] = (GLchan) MIN2( rgba[i][ACOMP], dest[i][ACOMP] ); |
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| 234 | #endif |
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| 235 | } |
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| 236 | } |
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| 237 | } |
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| 238 | |||
| 239 | |||
| 240 | |||
| 241 | /* |
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| 242 | * Blend max function (for GL_EXT_blend_minmax) |
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| 243 | */ |
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| 244 | static void _BLENDAPI |
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| 245 | blend_max( GLcontext *ctx, GLuint n, const GLubyte mask[], |
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| 246 | GLchan rgba[][4], CONST GLchan dest[][4] ) |
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| 247 | { |
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| 248 | GLuint i; |
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| 249 | ASSERT(ctx->Color.BlendEquation==GL_MAX_EXT); |
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| 250 | (void) ctx; |
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| 251 | |||
| 252 | for (i=0;i<n;i++) { |
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| 253 | if (mask[i]) { |
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| 254 | rgba[i][RCOMP] = (GLchan) MAX2( rgba[i][RCOMP], dest[i][RCOMP] ); |
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| 255 | rgba[i][GCOMP] = (GLchan) MAX2( rgba[i][GCOMP], dest[i][GCOMP] ); |
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| 256 | rgba[i][BCOMP] = (GLchan) MAX2( rgba[i][BCOMP], dest[i][BCOMP] ); |
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| 257 | #if CHAN_TYPE == GL_FLOAT |
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| 258 | rgba[i][ACOMP] = (GLchan) MAX2(CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF), |
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| 259 | dest[i][ACOMP]); |
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| 260 | #else |
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| 261 | rgba[i][ACOMP] = (GLchan) MAX2( rgba[i][ACOMP], dest[i][ACOMP] ); |
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| 262 | #endif |
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| 263 | } |
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| 264 | } |
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| 265 | } |
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| 266 | |||
| 267 | |||
| 268 | |||
| 269 | /* |
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| 270 | * Modulate: result = src * dest |
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| 271 | */ |
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| 272 | static void _BLENDAPI |
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| 273 | blend_modulate( GLcontext *ctx, GLuint n, const GLubyte mask[], |
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| 274 | GLchan rgba[][4], CONST GLchan dest[][4] ) |
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| 275 | { |
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| 276 | GLuint i; |
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| 277 | (void) ctx; |
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| 278 | |||
| 279 | for (i=0;i<n;i++) { |
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| 280 | if (mask[i]) { |
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| 281 | #if CHAN_TYPE == GL_FLOAT |
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| 282 | rgba[i][RCOMP] = rgba[i][RCOMP] * dest[i][RCOMP]; |
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| 283 | rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP]; |
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| 284 | rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP]; |
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| 285 | rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP]; |
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| 286 | #elif CHAN_TYPE == GL_UNSIGNED_SHORT |
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| 287 | GLint r = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16; |
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| 288 | GLint g = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16; |
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| 289 | GLint b = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16; |
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| 290 | GLint a = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16; |
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| 291 | rgba[i][RCOMP] = (GLchan) r; |
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| 292 | rgba[i][GCOMP] = (GLchan) g; |
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| 293 | rgba[i][BCOMP] = (GLchan) b; |
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| 294 | rgba[i][ACOMP] = (GLchan) a; |
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| 295 | #else |
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| 296 | GLint r = (rgba[i][RCOMP] * dest[i][RCOMP] + 255) >> 8; |
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| 297 | GLint g = (rgba[i][GCOMP] * dest[i][GCOMP] + 255) >> 8; |
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| 298 | GLint b = (rgba[i][BCOMP] * dest[i][BCOMP] + 255) >> 8; |
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| 299 | GLint a = (rgba[i][ACOMP] * dest[i][ACOMP] + 255) >> 8; |
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| 300 | rgba[i][RCOMP] = (GLchan) r; |
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| 301 | rgba[i][GCOMP] = (GLchan) g; |
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| 302 | rgba[i][BCOMP] = (GLchan) b; |
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| 303 | rgba[i][ACOMP] = (GLchan) a; |
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| 304 | #endif |
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| 305 | } |
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| 306 | } |
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| 307 | } |
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| 308 | |||
| 309 | |||
| 310 | |||
| 311 | /* |
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| 312 | * General case blend pixels. |
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| 313 | * Input: n - number of pixels |
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| 314 | * mask - the usual write mask |
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| 315 | * In/Out: rgba - the incoming and modified pixels |
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| 316 | * Input: dest - the pixels from the dest color buffer |
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| 317 | */ |
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| 318 | static void _BLENDAPI |
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| 319 | blend_general( GLcontext *ctx, GLuint n, const GLubyte mask[], |
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| 320 | GLchan rgba[][4], CONST GLchan dest[][4] ) |
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| 321 | { |
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| 322 | const GLfloat rscale = 1.0F / CHAN_MAXF; |
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| 323 | const GLfloat gscale = 1.0F / CHAN_MAXF; |
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| 324 | const GLfloat bscale = 1.0F / CHAN_MAXF; |
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| 325 | const GLfloat ascale = 1.0F / CHAN_MAXF; |
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| 326 | GLuint i; |
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| 327 | |||
| 328 | for (i=0;i<n;i++) { |
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| 329 | if (mask[i]) { |
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| 330 | #if CHAN_TYPE == GL_FLOAT |
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| 331 | GLfloat Rs, Gs, Bs, As; /* Source colors */ |
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| 332 | GLfloat Rd, Gd, Bd, Ad; /* Dest colors */ |
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| 333 | #else |
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| 334 | GLint Rs, Gs, Bs, As; /* Source colors */ |
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| 335 | GLint Rd, Gd, Bd, Ad; /* Dest colors */ |
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| 336 | #endif |
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| 337 | GLfloat sR, sG, sB, sA; /* Source scaling */ |
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| 338 | GLfloat dR, dG, dB, dA; /* Dest scaling */ |
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| 339 | GLfloat r, g, b, a; /* result color */ |
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| 340 | |||
| 341 | /* Incoming/source Color */ |
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| 342 | Rs = rgba[i][RCOMP]; |
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| 343 | Gs = rgba[i][GCOMP]; |
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| 344 | Bs = rgba[i][BCOMP]; |
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| 345 | As = rgba[i][ACOMP]; |
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| 346 | #if CHAN_TYPE == GL_FLOAT |
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| 347 | /* clamp */ |
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| 348 | Rs = MIN2(Rs, CHAN_MAXF); |
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| 349 | Gs = MIN2(Gs, CHAN_MAXF); |
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| 350 | Bs = MIN2(Bs, CHAN_MAXF); |
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| 351 | As = MIN2(As, CHAN_MAXF); |
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| 352 | #endif |
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| 353 | |||
| 354 | /* Frame buffer/dest color */ |
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| 355 | Rd = dest[i][RCOMP]; |
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| 356 | Gd = dest[i][GCOMP]; |
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| 357 | Bd = dest[i][BCOMP]; |
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| 358 | Ad = dest[i][ACOMP]; |
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| 359 | #if CHAN_TYPE == GL_FLOAT |
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| 360 | /* clamp */ |
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| 361 | Rd = MIN2(Rd, CHAN_MAXF); |
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| 362 | Gd = MIN2(Gd, CHAN_MAXF); |
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| 363 | Bd = MIN2(Bd, CHAN_MAXF); |
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| 364 | Ad = MIN2(Ad, CHAN_MAXF); |
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| 365 | #endif |
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| 366 | |||
| 367 | /* Source RGB factor */ |
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| 368 | switch (ctx->Color.BlendSrcRGB) { |
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| 369 | case GL_ZERO: |
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| 370 | sR = sG = sB = 0.0F; |
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| 371 | break; |
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| 372 | case GL_ONE: |
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| 373 | sR = sG = sB = 1.0F; |
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| 374 | break; |
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| 375 | case GL_DST_COLOR: |
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| 376 | sR = (GLfloat) Rd * rscale; |
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| 377 | sG = (GLfloat) Gd * gscale; |
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| 378 | sB = (GLfloat) Bd * bscale; |
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| 379 | break; |
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| 380 | case GL_ONE_MINUS_DST_COLOR: |
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| 381 | sR = 1.0F - (GLfloat) Rd * rscale; |
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| 382 | sG = 1.0F - (GLfloat) Gd * gscale; |
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| 383 | sB = 1.0F - (GLfloat) Bd * bscale; |
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| 384 | break; |
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| 385 | case GL_SRC_ALPHA: |
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| 386 | sR = sG = sB = (GLfloat) As * ascale; |
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| 387 | break; |
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| 388 | case GL_ONE_MINUS_SRC_ALPHA: |
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| 389 | sR = sG = sB = 1.0F - (GLfloat) As * ascale; |
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| 390 | break; |
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| 391 | case GL_DST_ALPHA: |
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| 392 | sR = sG = sB = (GLfloat) Ad * ascale; |
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| 393 | break; |
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| 394 | case GL_ONE_MINUS_DST_ALPHA: |
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| 395 | sR = sG = sB = 1.0F - (GLfloat) Ad * ascale; |
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| 396 | break; |
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| 397 | case GL_SRC_ALPHA_SATURATE: |
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| 398 | if (As < CHAN_MAX - Ad) { |
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| 399 | sR = sG = sB = (GLfloat) As * ascale; |
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| 400 | } |
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| 401 | else { |
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| 402 | sR = sG = sB = 1.0F - (GLfloat) Ad * ascale; |
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| 403 | } |
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| 404 | break; |
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| 405 | case GL_CONSTANT_COLOR: |
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| 406 | sR = ctx->Color.BlendColor[0]; |
||
| 407 | sG = ctx->Color.BlendColor[1]; |
||
| 408 | sB = ctx->Color.BlendColor[2]; |
||
| 409 | break; |
||
| 410 | case GL_ONE_MINUS_CONSTANT_COLOR: |
||
| 411 | sR = 1.0F - ctx->Color.BlendColor[0]; |
||
| 412 | sG = 1.0F - ctx->Color.BlendColor[1]; |
||
| 413 | sB = 1.0F - ctx->Color.BlendColor[2]; |
||
| 414 | break; |
||
| 415 | case GL_CONSTANT_ALPHA: |
||
| 416 | sR = sG = sB = ctx->Color.BlendColor[3]; |
||
| 417 | break; |
||
| 418 | case GL_ONE_MINUS_CONSTANT_ALPHA: |
||
| 419 | sR = sG = sB = 1.0F - ctx->Color.BlendColor[3]; |
||
| 420 | break; |
||
| 421 | case GL_SRC_COLOR: /* GL_NV_blend_square */ |
||
| 422 | sR = (GLfloat) Rs * rscale; |
||
| 423 | sG = (GLfloat) Gs * gscale; |
||
| 424 | sB = (GLfloat) Bs * bscale; |
||
| 425 | break; |
||
| 426 | case GL_ONE_MINUS_SRC_COLOR: /* GL_NV_blend_square */ |
||
| 427 | sR = 1.0F - (GLfloat) Rs * rscale; |
||
| 428 | sG = 1.0F - (GLfloat) Gs * gscale; |
||
| 429 | sB = 1.0F - (GLfloat) Bs * bscale; |
||
| 430 | break; |
||
| 431 | default: |
||
| 432 | /* this should never happen */ |
||
| 433 | _mesa_problem(ctx, "Bad blend source RGB factor in do_blend"); |
||
| 434 | return; |
||
| 435 | } |
||
| 436 | |||
| 437 | /* Source Alpha factor */ |
||
| 438 | switch (ctx->Color.BlendSrcA) { |
||
| 439 | case GL_ZERO: |
||
| 440 | sA = 0.0F; |
||
| 441 | break; |
||
| 442 | case GL_ONE: |
||
| 443 | sA = 1.0F; |
||
| 444 | break; |
||
| 445 | case GL_DST_COLOR: |
||
| 446 | sA = (GLfloat) Ad * ascale; |
||
| 447 | break; |
||
| 448 | case GL_ONE_MINUS_DST_COLOR: |
||
| 449 | sA = 1.0F - (GLfloat) Ad * ascale; |
||
| 450 | break; |
||
| 451 | case GL_SRC_ALPHA: |
||
| 452 | sA = (GLfloat) As * ascale; |
||
| 453 | break; |
||
| 454 | case GL_ONE_MINUS_SRC_ALPHA: |
||
| 455 | sA = 1.0F - (GLfloat) As * ascale; |
||
| 456 | break; |
||
| 457 | case GL_DST_ALPHA: |
||
| 458 | sA =(GLfloat) Ad * ascale; |
||
| 459 | break; |
||
| 460 | case GL_ONE_MINUS_DST_ALPHA: |
||
| 461 | sA = 1.0F - (GLfloat) Ad * ascale; |
||
| 462 | break; |
||
| 463 | case GL_SRC_ALPHA_SATURATE: |
||
| 464 | sA = 1.0; |
||
| 465 | break; |
||
| 466 | case GL_CONSTANT_COLOR: |
||
| 467 | sA = ctx->Color.BlendColor[3]; |
||
| 468 | break; |
||
| 469 | case GL_ONE_MINUS_CONSTANT_COLOR: |
||
| 470 | sA = 1.0F - ctx->Color.BlendColor[3]; |
||
| 471 | break; |
||
| 472 | case GL_CONSTANT_ALPHA: |
||
| 473 | sA = ctx->Color.BlendColor[3]; |
||
| 474 | break; |
||
| 475 | case GL_ONE_MINUS_CONSTANT_ALPHA: |
||
| 476 | sA = 1.0F - ctx->Color.BlendColor[3]; |
||
| 477 | break; |
||
| 478 | case GL_SRC_COLOR: /* GL_NV_blend_square */ |
||
| 479 | sA = (GLfloat) As * ascale; |
||
| 480 | break; |
||
| 481 | case GL_ONE_MINUS_SRC_COLOR: /* GL_NV_blend_square */ |
||
| 482 | sA = 1.0F - (GLfloat) As * ascale; |
||
| 483 | break; |
||
| 484 | default: |
||
| 485 | /* this should never happen */ |
||
| 486 | sA = 0.0F; |
||
| 487 | _mesa_problem(ctx, "Bad blend source A factor in do_blend"); |
||
| 488 | } |
||
| 489 | |||
| 490 | /* Dest RGB factor */ |
||
| 491 | switch (ctx->Color.BlendDstRGB) { |
||
| 492 | case GL_ZERO: |
||
| 493 | dR = dG = dB = 0.0F; |
||
| 494 | break; |
||
| 495 | case GL_ONE: |
||
| 496 | dR = dG = dB = 1.0F; |
||
| 497 | break; |
||
| 498 | case GL_SRC_COLOR: |
||
| 499 | dR = (GLfloat) Rs * rscale; |
||
| 500 | dG = (GLfloat) Gs * gscale; |
||
| 501 | dB = (GLfloat) Bs * bscale; |
||
| 502 | break; |
||
| 503 | case GL_ONE_MINUS_SRC_COLOR: |
||
| 504 | dR = 1.0F - (GLfloat) Rs * rscale; |
||
| 505 | dG = 1.0F - (GLfloat) Gs * gscale; |
||
| 506 | dB = 1.0F - (GLfloat) Bs * bscale; |
||
| 507 | break; |
||
| 508 | case GL_SRC_ALPHA: |
||
| 509 | dR = dG = dB = (GLfloat) As * ascale; |
||
| 510 | break; |
||
| 511 | case GL_ONE_MINUS_SRC_ALPHA: |
||
| 512 | dR = dG = dB = 1.0F - (GLfloat) As * ascale; |
||
| 513 | break; |
||
| 514 | case GL_DST_ALPHA: |
||
| 515 | dR = dG = dB = (GLfloat) Ad * ascale; |
||
| 516 | break; |
||
| 517 | case GL_ONE_MINUS_DST_ALPHA: |
||
| 518 | dR = dG = dB = 1.0F - (GLfloat) Ad * ascale; |
||
| 519 | break; |
||
| 520 | case GL_CONSTANT_COLOR: |
||
| 521 | dR = ctx->Color.BlendColor[0]; |
||
| 522 | dG = ctx->Color.BlendColor[1]; |
||
| 523 | dB = ctx->Color.BlendColor[2]; |
||
| 524 | break; |
||
| 525 | case GL_ONE_MINUS_CONSTANT_COLOR: |
||
| 526 | dR = 1.0F - ctx->Color.BlendColor[0]; |
||
| 527 | dG = 1.0F - ctx->Color.BlendColor[1]; |
||
| 528 | dB = 1.0F - ctx->Color.BlendColor[2]; |
||
| 529 | break; |
||
| 530 | case GL_CONSTANT_ALPHA: |
||
| 531 | dR = dG = dB = ctx->Color.BlendColor[3]; |
||
| 532 | break; |
||
| 533 | case GL_ONE_MINUS_CONSTANT_ALPHA: |
||
| 534 | dR = dG = dB = 1.0F - ctx->Color.BlendColor[3]; |
||
| 535 | break; |
||
| 536 | case GL_DST_COLOR: /* GL_NV_blend_square */ |
||
| 537 | dR = (GLfloat) Rd * rscale; |
||
| 538 | dG = (GLfloat) Gd * gscale; |
||
| 539 | dB = (GLfloat) Bd * bscale; |
||
| 540 | break; |
||
| 541 | case GL_ONE_MINUS_DST_COLOR: /* GL_NV_blend_square */ |
||
| 542 | dR = 1.0F - (GLfloat) Rd * rscale; |
||
| 543 | dG = 1.0F - (GLfloat) Gd * gscale; |
||
| 544 | dB = 1.0F - (GLfloat) Bd * bscale; |
||
| 545 | break; |
||
| 546 | default: |
||
| 547 | /* this should never happen */ |
||
| 548 | dR = dG = dB = 0.0F; |
||
| 549 | _mesa_problem(ctx, "Bad blend dest RGB factor in do_blend"); |
||
| 550 | } |
||
| 551 | |||
| 552 | /* Dest Alpha factor */ |
||
| 553 | switch (ctx->Color.BlendDstA) { |
||
| 554 | case GL_ZERO: |
||
| 555 | dA = 0.0F; |
||
| 556 | break; |
||
| 557 | case GL_ONE: |
||
| 558 | dA = 1.0F; |
||
| 559 | break; |
||
| 560 | case GL_SRC_COLOR: |
||
| 561 | dA = (GLfloat) As * ascale; |
||
| 562 | break; |
||
| 563 | case GL_ONE_MINUS_SRC_COLOR: |
||
| 564 | dA = 1.0F - (GLfloat) As * ascale; |
||
| 565 | break; |
||
| 566 | case GL_SRC_ALPHA: |
||
| 567 | dA = (GLfloat) As * ascale; |
||
| 568 | break; |
||
| 569 | case GL_ONE_MINUS_SRC_ALPHA: |
||
| 570 | dA = 1.0F - (GLfloat) As * ascale; |
||
| 571 | break; |
||
| 572 | case GL_DST_ALPHA: |
||
| 573 | dA = (GLfloat) Ad * ascale; |
||
| 574 | break; |
||
| 575 | case GL_ONE_MINUS_DST_ALPHA: |
||
| 576 | dA = 1.0F - (GLfloat) Ad * ascale; |
||
| 577 | break; |
||
| 578 | case GL_CONSTANT_COLOR: |
||
| 579 | dA = ctx->Color.BlendColor[3]; |
||
| 580 | break; |
||
| 581 | case GL_ONE_MINUS_CONSTANT_COLOR: |
||
| 582 | dA = 1.0F - ctx->Color.BlendColor[3]; |
||
| 583 | break; |
||
| 584 | case GL_CONSTANT_ALPHA: |
||
| 585 | dA = ctx->Color.BlendColor[3]; |
||
| 586 | break; |
||
| 587 | case GL_ONE_MINUS_CONSTANT_ALPHA: |
||
| 588 | dA = 1.0F - ctx->Color.BlendColor[3]; |
||
| 589 | break; |
||
| 590 | case GL_DST_COLOR: /* GL_NV_blend_square */ |
||
| 591 | dA = (GLfloat) Ad * ascale; |
||
| 592 | break; |
||
| 593 | case GL_ONE_MINUS_DST_COLOR: /* GL_NV_blend_square */ |
||
| 594 | dA = 1.0F - (GLfloat) Ad * ascale; |
||
| 595 | break; |
||
| 596 | default: |
||
| 597 | /* this should never happen */ |
||
| 598 | dA = 0.0F; |
||
| 599 | _mesa_problem(ctx, "Bad blend dest A factor in do_blend"); |
||
| 600 | return; |
||
| 601 | } |
||
| 602 | |||
| 603 | /* Due to round-off problems we have to clamp against zero. */ |
||
| 604 | /* Optimization: we don't have to do this for all src & dst factors */ |
||
| 605 | if (dA < 0.0F) dA = 0.0F; |
||
| 606 | if (dR < 0.0F) dR = 0.0F; |
||
| 607 | if (dG < 0.0F) dG = 0.0F; |
||
| 608 | if (dB < 0.0F) dB = 0.0F; |
||
| 609 | if (sA < 0.0F) sA = 0.0F; |
||
| 610 | if (sR < 0.0F) sR = 0.0F; |
||
| 611 | if (sG < 0.0F) sG = 0.0F; |
||
| 612 | if (sB < 0.0F) sB = 0.0F; |
||
| 613 | |||
| 614 | ASSERT( sR <= 1.0 ); |
||
| 615 | ASSERT( sG <= 1.0 ); |
||
| 616 | ASSERT( sB <= 1.0 ); |
||
| 617 | ASSERT( sA <= 1.0 ); |
||
| 618 | ASSERT( dR <= 1.0 ); |
||
| 619 | ASSERT( dG <= 1.0 ); |
||
| 620 | ASSERT( dB <= 1.0 ); |
||
| 621 | ASSERT( dA <= 1.0 ); |
||
| 622 | |||
| 623 | /* compute blended color */ |
||
| 624 | #if CHAN_TYPE == GL_FLOAT |
||
| 625 | if (ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) { |
||
| 626 | r = Rs * sR + Rd * dR; |
||
| 627 | g = Gs * sG + Gd * dG; |
||
| 628 | b = Bs * sB + Bd * dB; |
||
| 629 | a = As * sA + Ad * dA; |
||
| 630 | } |
||
| 631 | else if (ctx->Color.BlendEquation==GL_FUNC_SUBTRACT_EXT) { |
||
| 632 | r = Rs * sR - Rd * dR; |
||
| 633 | g = Gs * sG - Gd * dG; |
||
| 634 | b = Bs * sB - Bd * dB; |
||
| 635 | a = As * sA - Ad * dA; |
||
| 636 | } |
||
| 637 | else if (ctx->Color.BlendEquation==GL_FUNC_REVERSE_SUBTRACT_EXT) { |
||
| 638 | r = Rd * dR - Rs * sR; |
||
| 639 | g = Gd * dG - Gs * sG; |
||
| 640 | b = Bd * dB - Bs * sB; |
||
| 641 | a = Ad * dA - As * sA; |
||
| 642 | } |
||
| 643 | else { |
||
| 644 | /* should never get here */ |
||
| 645 | r = g = b = a = 0.0F; /* silence uninitialized var warning */ |
||
| 646 | _mesa_problem(ctx, "unexpected BlendEquation in blend_general()"); |
||
| 647 | } |
||
| 648 | |||
| 649 | /* final clamping */ |
||
| 650 | rgba[i][RCOMP] = MAX2( r, 0.0F ); |
||
| 651 | rgba[i][GCOMP] = MAX2( g, 0.0F ); |
||
| 652 | rgba[i][BCOMP] = MAX2( b, 0.0F ); |
||
| 653 | rgba[i][ACOMP] = CLAMP( a, 0.0F, CHAN_MAXF ); |
||
| 654 | #else |
||
| 655 | if (ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) { |
||
| 656 | r = Rs * sR + Rd * dR + 0.5F; |
||
| 657 | g = Gs * sG + Gd * dG + 0.5F; |
||
| 658 | b = Bs * sB + Bd * dB + 0.5F; |
||
| 659 | a = As * sA + Ad * dA + 0.5F; |
||
| 660 | } |
||
| 661 | else if (ctx->Color.BlendEquation==GL_FUNC_SUBTRACT_EXT) { |
||
| 662 | r = Rs * sR - Rd * dR + 0.5F; |
||
| 663 | g = Gs * sG - Gd * dG + 0.5F; |
||
| 664 | b = Bs * sB - Bd * dB + 0.5F; |
||
| 665 | a = As * sA - Ad * dA + 0.5F; |
||
| 666 | } |
||
| 667 | else if (ctx->Color.BlendEquation==GL_FUNC_REVERSE_SUBTRACT_EXT) { |
||
| 668 | r = Rd * dR - Rs * sR + 0.5F; |
||
| 669 | g = Gd * dG - Gs * sG + 0.5F; |
||
| 670 | b = Bd * dB - Bs * sB + 0.5F; |
||
| 671 | a = Ad * dA - As * sA + 0.5F; |
||
| 672 | } |
||
| 673 | else { |
||
| 674 | /* should never get here */ |
||
| 675 | r = g = b = a = 0.0F; /* silence uninitialized var warning */ |
||
| 676 | _mesa_problem(ctx, "unexpected BlendEquation in blend_general()"); |
||
| 677 | } |
||
| 678 | |||
| 679 | /* final clamping */ |
||
| 680 | rgba[i][RCOMP] = (GLchan) (GLint) CLAMP( r, 0.0F, CHAN_MAXF ); |
||
| 681 | rgba[i][GCOMP] = (GLchan) (GLint) CLAMP( g, 0.0F, CHAN_MAXF ); |
||
| 682 | rgba[i][BCOMP] = (GLchan) (GLint) CLAMP( b, 0.0F, CHAN_MAXF ); |
||
| 683 | rgba[i][ACOMP] = (GLchan) (GLint) CLAMP( a, 0.0F, CHAN_MAXF ); |
||
| 684 | #endif |
||
| 685 | } |
||
| 686 | } |
||
| 687 | } |
||
| 688 | |||
| 689 | |||
| 690 | |||
| 691 | |||
| 692 | |||
| 693 | /* |
||
| 694 | * Analyze current blending parameters to pick fastest blending function. |
||
| 695 | * Result: the ctx->Color.BlendFunc pointer is updated. |
||
| 696 | */ |
||
| 697 | void _swrast_choose_blend_func( GLcontext *ctx ) |
||
| 698 | { |
||
| 699 | const GLenum eq = ctx->Color.BlendEquation; |
||
| 700 | const GLenum srcRGB = ctx->Color.BlendSrcRGB; |
||
| 701 | const GLenum dstRGB = ctx->Color.BlendDstRGB; |
||
| 702 | const GLenum srcA = ctx->Color.BlendSrcA; |
||
| 703 | const GLenum dstA = ctx->Color.BlendDstA; |
||
| 704 | |||
| 705 | if (srcRGB != srcA || dstRGB != dstA) { |
||
| 706 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_general; |
||
| 707 | } |
||
| 708 | else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_SRC_ALPHA |
||
| 709 | && dstRGB==GL_ONE_MINUS_SRC_ALPHA) { |
||
| 710 | #if defined(USE_MMX_ASM) |
||
| 711 | if ( cpu_has_mmx ) { |
||
| 712 | SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_transparency; |
||
| 713 | } |
||
| 714 | else |
||
| 715 | #endif |
||
| 716 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_transparency; |
||
| 717 | } |
||
| 718 | else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_ONE && dstRGB==GL_ONE) { |
||
| 719 | #if defined(USE_MMX_ASM) |
||
| 720 | if ( cpu_has_mmx ) { |
||
| 721 | SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_add; |
||
| 722 | } |
||
| 723 | else |
||
| 724 | #endif |
||
| 725 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_add; |
||
| 726 | } |
||
| 727 | else if (((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_REVERSE_SUBTRACT_EXT) |
||
| 728 | && (srcRGB==GL_ZERO && dstRGB==GL_SRC_COLOR)) |
||
| 729 | || |
||
| 730 | ((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_SUBTRACT_EXT) |
||
| 731 | && (srcRGB==GL_DST_COLOR && dstRGB==GL_ZERO))) { |
||
| 732 | #if defined(USE_MMX_ASM) |
||
| 733 | if ( cpu_has_mmx ) { |
||
| 734 | SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_modulate; |
||
| 735 | } |
||
| 736 | else |
||
| 737 | #endif |
||
| 738 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_modulate; |
||
| 739 | } |
||
| 740 | else if (eq==GL_MIN_EXT) { |
||
| 741 | #if defined(USE_MMX_ASM) |
||
| 742 | if ( cpu_has_mmx ) { |
||
| 743 | SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_min; |
||
| 744 | } |
||
| 745 | else |
||
| 746 | #endif |
||
| 747 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_min; |
||
| 748 | } |
||
| 749 | else if (eq==GL_MAX_EXT) { |
||
| 750 | #if defined(USE_MMX_ASM) |
||
| 751 | if ( cpu_has_mmx ) { |
||
| 752 | SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_max; |
||
| 753 | } |
||
| 754 | else |
||
| 755 | #endif |
||
| 756 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_max; |
||
| 757 | } |
||
| 758 | else if (eq==GL_FUNC_ADD_EXT && srcRGB == GL_ZERO && dstRGB == GL_ONE) { |
||
| 759 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_noop; |
||
| 760 | } |
||
| 761 | else if (eq==GL_FUNC_ADD_EXT && srcRGB == GL_ONE && dstRGB == GL_ZERO) { |
||
| 762 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_replace; |
||
| 763 | } |
||
| 764 | else { |
||
| 765 | SWRAST_CONTEXT(ctx)->BlendFunc = blend_general; |
||
| 766 | } |
||
| 767 | } |
||
| 768 | |||
| 769 | |||
| 770 | |||
| 771 | /* |
||
| 772 | * Apply the blending operator to a span of pixels. |
||
| 773 | * We can handle horizontal runs of pixels (spans) or arrays of x/y |
||
| 774 | * pixel coordinates. |
||
| 775 | */ |
||
| 776 | void |
||
| 777 | _mesa_blend_span( GLcontext *ctx, const struct sw_span *span, |
||
| 778 | GLchan rgba[][4] ) |
||
| 779 | { |
||
| 780 | SWcontext *swrast = SWRAST_CONTEXT(ctx); |
||
| 781 | GLchan framebuffer[MAX_WIDTH][4]; |
||
| 782 | |||
| 783 | ASSERT(span->end <= MAX_WIDTH); |
||
| 784 | ASSERT(span->arrayMask & SPAN_RGBA); |
||
| 785 | ASSERT(!ctx->Color.ColorLogicOpEnabled); |
||
| 786 | |||
| 787 | /* Read span of current frame buffer pixels */ |
||
| 788 | if (span->arrayMask & SPAN_XY) { |
||
| 789 | /* array of x/y pixel coords */ |
||
| 790 | (*swrast->Driver.ReadRGBAPixels)( ctx, span->end, |
||
| 791 | span->array->x, span->array->y, |
||
| 792 | framebuffer, span->array->mask ); |
||
| 793 | if (swrast->_RasterMask & ALPHABUF_BIT) { |
||
| 794 | _mesa_read_alpha_pixels( ctx, span->end, |
||
| 795 | span->array->x, span->array->y, |
||
| 796 | framebuffer, span->array->mask ); |
||
| 797 | } |
||
| 798 | } |
||
| 799 | else { |
||
| 800 | /* horizontal run of pixels */ |
||
| 801 | _mesa_read_rgba_span( ctx, ctx->DrawBuffer, span->end, |
||
| 802 | span->x, span->y, framebuffer ); |
||
| 803 | } |
||
| 804 | |||
| 805 | SWRAST_CONTEXT(ctx)->BlendFunc( ctx, span->end, span->array->mask, rgba, |
||
| 806 | (const GLchan (*)[4]) framebuffer ); |
||
| 807 | } |