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-rw-r--r--mesalib/src/mesa/swrast/s_masking.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/mesalib/src/mesa/swrast/s_masking.c b/mesalib/src/mesa/swrast/s_masking.c
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+++ b/mesalib/src/mesa/swrast/s_masking.c
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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5.2
+ *
+ * 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"),
+ * 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.
+ */
+
+
+/*
+ * Implement the effect of glColorMask and glIndexMask in software.
+ */
+
+
+#include "main/glheader.h"
+#include "main/macros.h"
+
+#include "s_context.h"
+#include "s_masking.h"
+#include "s_span.h"
+
+
+/**
+ * Apply the color mask to a span of rgba values.
+ */
+void
+_swrast_mask_rgba_span(GLcontext *ctx, struct gl_renderbuffer *rb,
+ SWspan *span)
+{
+ const GLuint n = span->end;
+ void *rbPixels;
+
+ ASSERT(n < MAX_WIDTH);
+ ASSERT(span->arrayMask & SPAN_RGBA);
+ ASSERT(rb->DataType == span->array->ChanType);
+
+ rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
+
+ /*
+ * Do component masking.
+ * Note that we're not using span->array->mask[] here. We could...
+ */
+ if (span->array->ChanType == GL_UNSIGNED_BYTE) {
+ /* treat 4xGLubyte as 1xGLuint */
+ const GLuint srcMask = *((GLuint *) ctx->Color.ColorMask);
+ const GLuint dstMask = ~srcMask;
+ const GLuint *dst = (const GLuint *) rbPixels;
+ GLuint *src = (GLuint *) span->array->rgba8;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ src[i] = (src[i] & srcMask) | (dst[i] & dstMask);
+ }
+ }
+ else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
+ /* 2-byte components */
+ /* XXX try to use 64-bit arithmetic someday */
+ const GLushort rMask = ctx->Color.ColorMask[RCOMP] ? 0xffff : 0x0;
+ const GLushort gMask = ctx->Color.ColorMask[GCOMP] ? 0xffff : 0x0;
+ const GLushort bMask = ctx->Color.ColorMask[BCOMP] ? 0xffff : 0x0;
+ const GLushort aMask = ctx->Color.ColorMask[ACOMP] ? 0xffff : 0x0;
+ const GLushort (*dst)[4] = (const GLushort (*)[4]) rbPixels;
+ GLushort (*src)[4] = span->array->rgba16;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask);
+ src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask);
+ src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask);
+ src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask);
+ }
+ }
+ else {
+ /* 4-byte components */
+ const GLuint rMask = ctx->Color.ColorMask[RCOMP] ? ~0x0 : 0x0;
+ const GLuint gMask = ctx->Color.ColorMask[GCOMP] ? ~0x0 : 0x0;
+ const GLuint bMask = ctx->Color.ColorMask[BCOMP] ? ~0x0 : 0x0;
+ const GLuint aMask = ctx->Color.ColorMask[ACOMP] ? ~0x0 : 0x0;
+ const GLuint (*dst)[4] = (const GLuint (*)[4]) rbPixels;
+ GLuint (*src)[4] = (GLuint (*)[4]) span->array->attribs[FRAG_ATTRIB_COL0];
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask);
+ src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask);
+ src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask);
+ src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask);
+ }
+ }
+}
+
+
+/**
+ * Apply the index mask to a span of color index values.
+ */
+void
+_swrast_mask_ci_span(GLcontext *ctx, struct gl_renderbuffer *rb,
+ SWspan *span)
+{
+ const GLuint srcMask = ctx->Color.IndexMask;
+ const GLuint dstMask = ~srcMask;
+ GLuint *index = span->array->index;
+ GLuint dest[MAX_WIDTH];
+ GLuint i;
+
+ ASSERT(span->arrayMask & SPAN_INDEX);
+ ASSERT(span->end <= MAX_WIDTH);
+ ASSERT(rb->DataType == GL_UNSIGNED_INT);
+
+ if (span->arrayMask & SPAN_XY) {
+ _swrast_get_values(ctx, rb, span->end, span->array->x, span->array->y,
+ dest, sizeof(GLuint));
+ }
+ else {
+ _swrast_read_index_span(ctx, rb, span->end, span->x, span->y, dest);
+ }
+
+ for (i = 0; i < span->end; i++) {
+ index[i] = (index[i] & srcMask) | (dest[i] & dstMask);
+ }
+}