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#include "s_span.h"
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* Apply the color mask to a span of rgba values.
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_swrast_mask_rgba_span(GLcontext *ctx, struct gl_renderbuffer *rb,
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const struct sw_span *span, GLchan rgba[][4])
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GLchan dest[MAX_WIDTH][4];
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GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
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GLuint dstMask = ~srcMask;
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GLuint *rgba32 = (GLuint *) rgba;
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GLuint *dest32 = (GLuint *) dest;
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const GLboolean rMask = ctx->Color.ColorMask[RCOMP];
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const GLboolean gMask = ctx->Color.ColorMask[GCOMP];
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const GLboolean bMask = ctx->Color.ColorMask[BCOMP];
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const GLboolean aMask = ctx->Color.ColorMask[ACOMP];
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const GLuint n = span->end;
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ASSERT(n < MAX_WIDTH);
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ASSERT(span->arrayMask & SPAN_RGBA);
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if (span->arrayMask & SPAN_XY) {
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_swrast_get_values(ctx, rb, n, span->array->x, span->array->y,
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dest, 4 * sizeof(GLchan));
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ASSERT(rb->DataType == span->array->ChanType);
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rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
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* Do component masking.
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* Note that we're not using span->array->mask[] here. We could...
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if (span->array->ChanType == GL_UNSIGNED_BYTE) {
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/* treat 4xGLubyte as 1xGLuint */
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const GLuint srcMask = *((GLuint *) ctx->Color.ColorMask);
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const GLuint dstMask = ~srcMask;
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const GLuint *dst = (const GLuint *) rbPixels;
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GLuint *src = (GLuint *) span->array->color.sz1.rgba;
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for (i = 0; i < n; i++) {
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src[i] = (src[i] & srcMask) | (dst[i] & dstMask);
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else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
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/* 2-byte components */
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/* XXX try to use 64-bit arithmetic someday */
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const GLushort rMask = ctx->Color.ColorMask[RCOMP] ? 0xffff : 0x0;
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const GLushort gMask = ctx->Color.ColorMask[GCOMP] ? 0xffff : 0x0;
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const GLushort bMask = ctx->Color.ColorMask[BCOMP] ? 0xffff : 0x0;
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const GLushort aMask = ctx->Color.ColorMask[ACOMP] ? 0xffff : 0x0;
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const GLushort (*dst)[4] = (const GLushort (*)[4]) rbPixels;
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GLushort (*src)[4] = span->array->color.sz2.rgba;
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for (i = 0; i < n; i++) {
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src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask);
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src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask);
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src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask);
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src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask);
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_swrast_read_rgba_span(ctx, rb, n, span->x, span->y, dest);
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for (i = 0; i < n; i++) {
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rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
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for (i = 0; i < n; i++) {
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if (!rMask) rgba[i][RCOMP] = dest[i][RCOMP];
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if (!gMask) rgba[i][GCOMP] = dest[i][GCOMP];
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if (!bMask) rgba[i][BCOMP] = dest[i][BCOMP];
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if (!aMask) rgba[i][ACOMP] = dest[i][ACOMP];
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/* 4-byte components */
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const GLuint rMask = ctx->Color.ColorMask[RCOMP] ? ~0x0 : 0x0;
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const GLuint gMask = ctx->Color.ColorMask[GCOMP] ? ~0x0 : 0x0;
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const GLuint bMask = ctx->Color.ColorMask[BCOMP] ? ~0x0 : 0x0;
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const GLuint aMask = ctx->Color.ColorMask[ACOMP] ? ~0x0 : 0x0;
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const GLuint (*dst)[4] = (const GLuint (*)[4]) rbPixels;
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GLuint (*src)[4] = (GLuint (*)[4]) span->array->color.sz4.rgba;
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for (i = 0; i < n; i++) {
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src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask);
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src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask);
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src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask);
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src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask);
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* Apply glColorMask to a span of RGBA pixels.
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* Apply the index mask to a span of color index values.
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_swrast_mask_rgba_array(GLcontext *ctx, struct gl_renderbuffer *rb,
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GLuint n, GLint x, GLint y, GLchan rgba[][4])
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GLchan dest[MAX_WIDTH][4];
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GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
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GLuint dstMask = ~srcMask;
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GLuint *rgba32 = (GLuint *) rgba;
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GLuint *dest32 = (GLuint *) dest;
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_swrast_read_rgba_span( ctx, rb, n, x, y, dest );
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for (i = 0; i < n; i++) {
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rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
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const GLint rMask = ctx->Color.ColorMask[RCOMP];
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const GLint gMask = ctx->Color.ColorMask[GCOMP];
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const GLint bMask = ctx->Color.ColorMask[BCOMP];
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const GLint aMask = ctx->Color.ColorMask[ACOMP];
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_swrast_read_rgba_span( ctx, rb, n, x, y, dest );
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for (i = 0; i < n; i++) {
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if (!rMask) rgba[i][RCOMP] = dest[i][RCOMP];
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if (!gMask) rgba[i][GCOMP] = dest[i][GCOMP];
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if (!bMask) rgba[i][BCOMP] = dest[i][BCOMP];
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if (!aMask) rgba[i][ACOMP] = dest[i][ACOMP];
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_swrast_mask_ci_span(GLcontext *ctx, struct gl_renderbuffer *rb,
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const struct sw_span *span, GLuint index[])
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const GLuint srcMask = ctx->Color.IndexMask;
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const GLuint dstMask = ~srcMask;
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GLuint *index = span->array->index;
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GLuint dest[MAX_WIDTH];