X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fswrast%2Fs_alpha.c;h=df2181ba968f2233bf109f4fb1aef54f7b0b6d39;hb=1b3ec16cc2c1190f0212fda26242f5e5206f5b1e;hp=ca34c120b4399d2e225d3318be07d608c002c6df;hpb=2a182a98973edc9ecf2936b1288485bb2b3fa722;p=mesa.git diff --git a/src/mesa/swrast/s_alpha.c b/src/mesa/swrast/s_alpha.c index ca34c120b43..df2181ba968 100644 --- a/src/mesa/swrast/s_alpha.c +++ b/src/mesa/swrast/s_alpha.c @@ -1,10 +1,8 @@ -/* $Id: s_alpha.c,v 1.6 2002/01/27 18:32:03 brianp Exp $ */ - /* * Mesa 3-D graphics library - * Version: 4.1 + * Version: 6.5.2 * - * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2006 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"), @@ -24,150 +22,139 @@ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ +/** + * \file swrast/s_alpha.c + * \brief Functions to apply alpha test. + */ -#include "glheader.h" -#include "context.h" -#include "colormac.h" -#include "macros.h" -#include "mmath.h" +#include "main/glheader.h" +#include "main/context.h" +#include "main/colormac.h" +#include "main/macros.h" #include "s_alpha.h" +#include "s_context.h" -/* - * Apply the alpha test to a span of pixels. - * In: rgba - array of pixels - * In/Out: span - - * Return: 0 = all pixels in the span failed the alpha test. - * 1 = one or more pixels passed the alpha test. +#define ALPHA_TEST(ALPHA, LOOP_CODE) \ +do { \ + switch (ctx->Color.AlphaFunc) { \ + case GL_LESS: \ + for (i = 0; i < n; i++) { \ + mask[i] &= (ALPHA < ref); \ + LOOP_CODE; \ + } \ + break; \ + case GL_LEQUAL: \ + for (i = 0; i < n; i++) { \ + mask[i] &= (ALPHA <= ref); \ + LOOP_CODE; \ + } \ + break; \ + case GL_GEQUAL: \ + for (i = 0; i < n; i++) { \ + mask[i] &= (ALPHA >= ref); \ + LOOP_CODE; \ + } \ + break; \ + case GL_GREATER: \ + for (i = 0; i < n; i++) { \ + mask[i] &= (ALPHA > ref); \ + LOOP_CODE; \ + } \ + break; \ + case GL_NOTEQUAL: \ + for (i = 0; i < n; i++) { \ + mask[i] &= (ALPHA != ref); \ + LOOP_CODE; \ + } \ + break; \ + case GL_EQUAL: \ + for (i = 0; i < n; i++) { \ + mask[i] &= (ALPHA == ref); \ + LOOP_CODE; \ + } \ + break; \ + default: \ + _mesa_problem(ctx, "Invalid alpha test in _swrast_alpha_test" ); \ + return 0; \ + } \ +} while (0) + + + +/** + * Perform the alpha test for an array of pixels. + * For pixels that fail the test, mask[i] will be set to 0. + * \return 0 if all pixels in the span failed the alpha test, + * 1 if one or more pixels passed the alpha test. */ GLint -_mesa_alpha_test( const GLcontext *ctx, struct sw_span *span, - CONST GLchan rgba[][4]) +_swrast_alpha_test(const struct gl_context *ctx, SWspan *span) { + const GLuint n = span->end; + GLubyte *mask = span->array->mask; GLuint i; - const GLchan ref = ctx->Color.AlphaRef; - GLubyte *mask = span->mask; - - ASSERT (span->filledAlpha == GL_TRUE || (span->arrayMask & SPAN_RGBA)); - /* switch cases ordered from most frequent to less frequent */ - switch (ctx->Color.AlphaFunc) { - case GL_LESS: - for (i=span->start; iend; i++) { - mask[i] &= (rgba[i][ACOMP] < ref); - } - break; - case GL_LEQUAL: - for (i=span->start; iend; i++) - mask[i] &= (rgba[i][ACOMP] <= ref); - break; - case GL_GEQUAL: - for (i=span->start; iend; i++) { - mask[i] &= (rgba[i][ACOMP] >= ref); - } - break; - case GL_GREATER: - for (i=span->start; iend; i++) { - mask[i] &= (rgba[i][ACOMP] > ref); - } - break; - case GL_NOTEQUAL: - for (i=span->start; iend; i++) { - mask[i] &= (rgba[i][ACOMP] != ref); - } - break; - case GL_EQUAL: - for (i=span->start; iend; i++) { - mask[i] &= (rgba[i][ACOMP] == ref); - } - break; - case GL_ALWAYS: - /* do nothing */ - return 1; - case GL_NEVER: - /* caller should check for zero! */ - return 0; - default: - _mesa_problem( ctx, "Invalid alpha test in gl_alpha_test" ); - return 0; + if (ctx->Color.AlphaFunc == GL_ALWAYS) { + /* do nothing */ + return 1; + } + else if (ctx->Color.AlphaFunc == GL_NEVER) { + /* All pixels failed - caller should check for this return value and + * act accordingly. + */ + span->writeAll = GL_FALSE; + return 0; } -#if 0 - /* XXXX This causes conformance failures!!!! */ - while ((span->start <= span->end) && - (mask[span->start] == 0)) - span->start ++; + if (span->arrayMask & SPAN_RGBA) { + /* Use array's alpha values */ + if (span->array->ChanType == GL_UNSIGNED_BYTE) { + GLubyte (*rgba)[4] = span->array->rgba8; + GLubyte ref; + CLAMPED_FLOAT_TO_UBYTE(ref, ctx->Color.AlphaRef); + ALPHA_TEST(rgba[i][ACOMP], ;); + } + else if (span->array->ChanType == GL_UNSIGNED_SHORT) { + GLushort (*rgba)[4] = span->array->rgba16; + GLushort ref; + CLAMPED_FLOAT_TO_USHORT(ref, ctx->Color.AlphaRef); + ALPHA_TEST(rgba[i][ACOMP], ;); + } + else { + GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; + const GLfloat ref = ctx->Color.AlphaRef; + ALPHA_TEST(rgba[i][ACOMP], ;); + } + } + else { + /* Interpolate alpha values */ + ASSERT(span->interpMask & SPAN_RGBA); + if (span->array->ChanType == GL_UNSIGNED_BYTE) { + const GLfixed alphaStep = span->alphaStep; + GLfixed alpha = span->alpha; + GLubyte ref; + CLAMPED_FLOAT_TO_UBYTE(ref, ctx->Color.AlphaRef); + ALPHA_TEST(FixedToInt(alpha), alpha += alphaStep); + } + else if (span->array->ChanType == GL_UNSIGNED_SHORT) { + const GLfixed alphaStep = span->alphaStep; + GLfixed alpha = span->alpha; + GLushort ref; + CLAMPED_FLOAT_TO_USHORT(ref, ctx->Color.AlphaRef); + ALPHA_TEST(FixedToInt(alpha), alpha += alphaStep); + } + else { + const GLfloat alphaStep = FixedToFloat(span->alphaStep); + GLfloat alpha = FixedToFloat(span->alpha); + const GLfloat ref = ctx->Color.AlphaRef; + ALPHA_TEST(alpha, alpha += alphaStep); + } + } - while ((span->end >= span->start) && - (mask[span->end] == 0)) - span->end --; -#endif span->writeAll = GL_FALSE; - if (span->start >= span->end) - return 0; - else - return 1; -} - - -/* - * Apply the alpha test to a span of pixels. - * In: rgba - array of pixels - * In/Out: mask - current pixel mask. Pixels which fail the alpha test - * will set the corresponding mask flag to 0. - * Return: 0 = all pixels in the span failed the alpha test. - * 1 = one or more pixels passed the alpha test. - */ -GLint -_old_alpha_test( const GLcontext *ctx, - GLuint n, CONST GLchan rgba[][4], GLubyte mask[] ) -{ - GLuint i; - const GLchan ref = ctx->Color.AlphaRef; - - /* switch cases ordered from most frequent to less frequent */ - switch (ctx->Color.AlphaFunc) { - case GL_LESS: - for (i=0;i= ref); - } - return 1; - case GL_GREATER: - for (i=0;i ref); - } - return 1; - case GL_NOTEQUAL: - for (i=0;i