X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fswrast%2Fs_alpha.c;h=df2181ba968f2233bf109f4fb1aef54f7b0b6d39;hb=1be3764dbe8d8ab2259c206a2158fe8f3c62c962;hp=d44bdb63eb9dda61018543078a930c87aa4dcb65;hpb=ceb39f4f8dc4863fde17d668c752533a2184476e;p=mesa.git diff --git a/src/mesa/swrast/s_alpha.c b/src/mesa/swrast/s_alpha.c index d44bdb63eb9..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 1.8 2002/01/31 00:27:43 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"), @@ -24,258 +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 ) +_swrast_alpha_test(const struct gl_context *ctx, SWspan *span) { - const GLchan (*rgba)[4] = (const GLchan (*)[4]) span->color.rgba; - const GLchan ref = ctx->Color.AlphaRef; const GLuint n = span->end; - GLubyte *mask = span->mask; + GLubyte *mask = span->array->mask; GLuint i; + 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 (span->arrayMask & SPAN_RGBA) { - /* Use the array values */ - switch (ctx->Color.AlphaFunc) { - case GL_LESS: - for (i = 0; i < n; i++) - mask[i] &= (rgba[i][ACOMP] < ref); - break; - case GL_LEQUAL: - for (i = 0; i < n; i++) - mask[i] &= (rgba[i][ACOMP] <= ref); - break; - case GL_GEQUAL: - for (i = 0; i < n; i++) - mask[i] &= (rgba[i][ACOMP] >= ref); - break; - case GL_GREATER: - for (i = 0; i < n; i++) - mask[i] &= (rgba[i][ACOMP] > ref); - break; - case GL_NOTEQUAL: - for (i = 0; i < n; i++) - mask[i] &= (rgba[i][ACOMP] != ref); - break; - case GL_EQUAL: - for (i = 0; i < n; i++) - mask[i] &= (rgba[i][ACOMP] == ref); - break; - case GL_ALWAYS: - /* do nothing */ - return 1; - case GL_NEVER: - /* caller should check for zero! */ - span->writeAll = GL_FALSE; - return 0; - default: - _mesa_problem( ctx, "Invalid alpha test in _mesa_alpha_test" ); - return 0; + /* 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 { - /* Use the interpolation values */ -#if CHAN_TYPE == GL_FLOAT - const GLfloat alphaStep = span->alphaStep; - GLfloat alpha = span->alpha; + /* Interpolate alpha values */ ASSERT(span->interpMask & SPAN_RGBA); - switch (ctx->Color.AlphaFunc) { - case GL_LESS: - for (i = 0; i < n; i++) { - mask[i] &= (alpha < ref); - alpha += alphaStep; - } - break; - case GL_LEQUAL: - for (i = 0; i < n; i++) { - mask[i] &= (alpha <= ref); - alpha += alphaStep; - } - break; - case GL_GEQUAL: - for (i = 0; i < n; i++) { - mask[i] &= (alpha >= ref); - alpha += alphaStep; - } - break; - case GL_GREATER: - for (i = 0; i < n; i++) { - mask[i] &= (alpha > ref); - alpha += alphaStep; - } - break; - case GL_NOTEQUAL: - for (i = 0; i < n; i++) { - mask[i] &= (alpha != ref); - alpha += alphaStep; - } - break; - case GL_EQUAL: - for (i = 0; i < n; i++) { - mask[i] &= (alpha == ref); - alpha += alphaStep; - } - break; - case GL_ALWAYS: - /* do nothing */ - return 1; - case GL_NEVER: - /* caller should check for zero! */ - span->writeAll = GL_FALSE; - return 0; - default: - _mesa_problem( ctx, "Invalid alpha test in gl_alpha_test" ); - return 0; + 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 - /* 8 or 16-bit channel interpolation */ - const GLfixed alphaStep = span->alphaStep; - GLfixed alpha = span->alpha; - ASSERT(span->interpMask & SPAN_RGBA); - switch (ctx->Color.AlphaFunc) { - case GL_LESS: - for (i = 0; i < n; i++) { - mask[i] &= (FixedToChan(alpha) < ref); - alpha += alphaStep; - } - break; - case GL_LEQUAL: - for (i = 0; i < n; i++) { - mask[i] &= (FixedToChan(alpha) <= ref); - alpha += alphaStep; - } - break; - case GL_GEQUAL: - for (i = 0; i < n; i++) { - mask[i] &= (FixedToChan(alpha) >= ref); - alpha += alphaStep; - } - break; - case GL_GREATER: - for (i = 0; i < n; i++) { - mask[i] &= (FixedToChan(alpha) > ref); - alpha += alphaStep; - } - break; - case GL_NOTEQUAL: - for (i = 0; i < n; i++) { - mask[i] &= (FixedToChan(alpha) != ref); - alpha += alphaStep; - } - break; - case GL_EQUAL: - for (i = 0; i < n; i++) { - mask[i] &= (FixedToChan(alpha) == ref); - alpha += alphaStep; - } - break; - case GL_ALWAYS: - /* do nothing */ - return 1; - case GL_NEVER: - /* caller should check for zero! */ - span->writeAll = GL_FALSE; - return 0; - default: - _mesa_problem( ctx, "Invalid alpha test in gl_alpha_test" ); - return 0; + 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); } -#endif /* CHAN_TYPE */ } -#if 0 - /* XXXX This causes conformance failures!!!! */ - while ((span->start <= span->end) && - (mask[span->start] == 0)) - span->start ++; - - 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