From e3a051e0538a605551f4d58294c94f5eb00ed07f Mon Sep 17 00:00:00 2001 From: Keith Whitwell Date: Tue, 31 Oct 2000 18:00:04 +0000 Subject: Moved software rasterizer functionality to new directory. --- src/mesa/swrast/s_blend.c | 667 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 667 insertions(+) create mode 100644 src/mesa/swrast/s_blend.c (limited to 'src/mesa/swrast/s_blend.c') diff --git a/src/mesa/swrast/s_blend.c b/src/mesa/swrast/s_blend.c new file mode 100644 index 0000000..0e65229 --- /dev/null +++ b/src/mesa/swrast/s_blend.c @@ -0,0 +1,667 @@ +/* $Id: s_blend.c,v 1.1 2000/10/31 18:00:04 keithw Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 3.5 + * + * Copyright (C) 1999-2000 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. + */ + + + +#include "glheader.h" +#include "context.h" +#include "macros.h" + +#include "s_alphabuf.h" +#include "s_blend.h" +#include "s_pb.h" +#include "s_span.h" + + +#ifdef USE_MMX_ASM +#define _BLENDAPI _ASMAPI +#else +#define _BLENDAPI +#endif + +/* + * 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.BlendEquation==GL_FUNC_ADD_EXT); + ASSERT(ctx->Color.BlendSrcRGB==GL_SRC_ALPHA); + ASSERT(ctx->Color.BlendDstRGB==GL_ONE_MINUS_SRC_ALPHA); + (void) ctx; + + for (i=0;i> 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 */ +#define DIV255(X) (((X) << 8) + (X) + 256) >> 16 + const GLint s = CHAN_MAX - t; + const GLint r = DIV255(rgba[i][RCOMP] * t + dest[i][RCOMP] * s); + const GLint g = DIV255(rgba[i][GCOMP] * t + dest[i][GCOMP] * s); + const GLint b = DIV255(rgba[i][BCOMP] * t + dest[i][BCOMP] * s); + const GLint a = DIV255(rgba[i][ACOMP] * t + dest[i][ACOMP] * s); +#undef DIV255 +#else + const GLint s = CHAN_MAX - t; + const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) / CHAN_MAX; + const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) / CHAN_MAX; + const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) / CHAN_MAX; + const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) / CHAN_MAX; +#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.BlendEquation==GL_FUNC_ADD_EXT); + ASSERT(ctx->Color.BlendSrcRGB==GL_ONE); + ASSERT(ctx->Color.BlendDstRGB==GL_ONE); + (void) ctx; + + for (i=0;iColor.BlendEquation==GL_MIN_EXT); + (void) ctx; + + for (i=0;iColor.BlendEquation==GL_MAX_EXT); + (void) ctx; + + for (i=0;i> 8; + GLint g = (rgba[i][GCOMP] * dest[i][GCOMP]) >> 8; + GLint b = (rgba[i][BCOMP] * dest[i][BCOMP]) >> 8; + GLint a = (rgba[i][ACOMP] * dest[i][ACOMP]) >> 8; + rgba[i][RCOMP] = (GLchan) r; + rgba[i][GCOMP] = (GLchan) g; + rgba[i][BCOMP] = (GLchan) b; + rgba[i][ACOMP] = (GLchan) a; + } + } +} + + + +/* + * 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] ) +{ + GLfloat rscale = 1.0F / CHAN_MAXF; + GLfloat gscale = 1.0F / CHAN_MAXF; + GLfloat bscale = 1.0F / CHAN_MAXF; + GLfloat ascale = 1.0F / CHAN_MAXF; + GLuint i; + + for (i=0;iColor.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 = (GLfloat) 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 */ + gl_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 = (GLfloat) 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; + gl_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 = (GLfloat) 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; + gl_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 = (GLfloat) 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; + gl_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 (ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) { + r = Rs * sR + Rd * dR + 0.5F; + g = Gs * sG + Gd * dG + 0.5F; + b = Bs * sB + Bd * dB + 0.5F; + a = As * sA + Ad * dA + 0.5F; + } + else if (ctx->Color.BlendEquation==GL_FUNC_SUBTRACT_EXT) { + r = Rs * sR - Rd * dR + 0.5F; + g = Gs * sG - Gd * dG + 0.5F; + b = Bs * sB - Bd * dB + 0.5F; + a = As * sA - Ad * dA + 0.5F; + } + else if (ctx->Color.BlendEquation==GL_FUNC_REVERSE_SUBTRACT_EXT) { + r = Rd * dR - Rs * sR + 0.5F; + g = Gd * dG - Gs * sG + 0.5F; + b = Bd * dB - Bs * sB + 0.5F; + a = Ad * dA - As * sA + 0.5F; + } + else { + /* should never get here */ + r = g = b = a = 0.0F; /* silence uninitialized var warning */ + gl_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 ); + } + } +} + + + +#if defined(USE_MMX_ASM) +#include "X86/mmx.h" +#include "X86/common_x86_asm.h" +#endif + + +/* + * Analyze current blending parameters to pick fastest blending function. + * Result: the ctx->Color.BlendFunc pointer is updated. + */ +static void set_blend_function( GLcontext *ctx ) +{ + const GLenum eq = ctx->Color.BlendEquation; + 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 defined(USE_MMX_ASM) + /* Hmm. A table here would have 12^4 == way too many entries. + * Provide a hook for MMX instead. + */ + if ( cpu_has_mmx ) { + gl_mmx_set_blend_function( ctx ); + } + else +#endif + if (srcRGB != srcA || dstRGB != dstA) { + ctx->Color.BlendFunc = blend_general; + } + else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_SRC_ALPHA + && dstRGB==GL_ONE_MINUS_SRC_ALPHA) { + ctx->Color.BlendFunc = blend_transparency; + } + else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_ONE && dstRGB==GL_ONE) { + ctx->Color.BlendFunc = blend_add; + } + else if (((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_REVERSE_SUBTRACT_EXT) + && (srcRGB==GL_ZERO && dstRGB==GL_SRC_COLOR)) + || + ((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_SUBTRACT_EXT) + && (srcRGB==GL_DST_COLOR && dstRGB==GL_ZERO))) { + ctx->Color.BlendFunc = blend_modulate; + } + else if (eq==GL_MIN_EXT) { + ctx->Color.BlendFunc = blend_min; + } + else if (eq==GL_MAX_EXT) { + ctx->Color.BlendFunc = blend_max; + } + else { + ctx->Color.BlendFunc = blend_general; + } +} + + + +/* + * Apply the blending operator to a span of pixels. + * Input: n - number of pixels in span + * x, y - location of leftmost pixel in span in window coords. + * mask - boolean mask indicating which pixels to blend. + * In/Out: rgba - pixel values + */ +void +_mesa_blend_span( GLcontext *ctx, GLuint n, GLint x, GLint y, + GLchan rgba[][4], const GLubyte mask[] ) +{ + GLchan dest[MAX_WIDTH][4]; + + /* Check if device driver can do the work */ + if (ctx->Color.BlendEquation==GL_LOGIC_OP && + !ctx->Color.ColorLogicOpEnabled) { + return; + } + + /* Read span of current frame buffer pixels */ + gl_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest ); + + if (!ctx->Color.BlendFunc) + set_blend_function(ctx); + + (*ctx->Color.BlendFunc)( ctx, n, mask, rgba, (const GLchan (*)[4])dest ); +} + + + +/* + * Apply the blending operator to an array of pixels. + * Input: n - number of pixels in span + * x, y - array of pixel locations + * mask - boolean mask indicating which pixels to blend. + * In/Out: rgba - pixel values + */ +void +_mesa_blend_pixels( GLcontext *ctx, + GLuint n, const GLint x[], const GLint y[], + GLchan rgba[][4], const GLubyte mask[] ) +{ + GLchan dest[PB_SIZE][4]; + + /* Check if device driver can do the work */ + if (ctx->Color.BlendEquation==GL_LOGIC_OP && + !ctx->Color.ColorLogicOpEnabled) { + return; + } + + /* Read pixels from current color buffer */ + (*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask ); + if (ctx->RasterMask & ALPHABUF_BIT) { + _mesa_read_alpha_pixels( ctx, n, x, y, dest, mask ); + } + + if (!ctx->Color.BlendFunc) + set_blend_function(ctx); + + (*ctx->Color.BlendFunc)( ctx, n, mask, rgba, (const GLchan (*)[4])dest ); +} -- cgit v1.1