diff options
Diffstat (limited to 'nx-X11/extras/Mesa/src/mesa/swrast/s_alpha.c')
-rw-r--r-- | nx-X11/extras/Mesa/src/mesa/swrast/s_alpha.c | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_alpha.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_alpha.c deleted file mode 100644 index 55c1e6a58..000000000 --- a/nx-X11/extras/Mesa/src/mesa/swrast/s_alpha.c +++ /dev/null @@ -1,224 +0,0 @@ - -/* - * Mesa 3-D graphics library - * Version: 4.1 - * - * Copyright (C) 1999-2002 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. - */ - -/** - * \file swrast/s_alpha.c - * \brief Functions to apply alpha test. - */ - -#include "glheader.h" -#include "context.h" -#include "colormac.h" -#include "macros.h" - -#include "s_alpha.h" -#include "s_context.h" - - -/** - * \fn GLint _swrast_alpha_test( const GLcontext *ctx, struct sw_span *span ) - * \brief Apply the alpha test to a span of pixels. - * \return - * - "0" = all pixels in the span failed the alpha test. - * - "1" = one or more pixels passed the alpha test. - */ -GLint -_swrast_alpha_test( const GLcontext *ctx, struct sw_span *span ) -{ - const GLchan (*rgba)[4] = (const GLchan (*)[4]) span->array->rgba; - GLchan ref; - const GLuint n = span->end; - GLubyte *mask = span->array->mask; - GLuint i; - - CLAMPED_FLOAT_TO_CHAN(ref, ctx->Color.AlphaRef); - - 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 _swrast_alpha_test" ); - return 0; - } - } - else { - /* Use the interpolation values */ -#if CHAN_TYPE == GL_FLOAT - const GLfloat alphaStep = span->alphaStep; - GLfloat alpha = span->alpha; - 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; - } -#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; - } -#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; -} |