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authorBrian Paul <brian.paul@tungstengraphics.com>2006-10-06 03:49:46 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2006-10-06 03:49:46 +0000
commite18d0f82b6271103e292fde5bab6fceccb96f90a (patch)
tree665abb3afa613f71e36974873dd7f485bcab645f /src/mesa
parent6e138dfa361c33b8e0adcf1cafa9781fb53e219d (diff)
deal with union/aliasing in convert_color_type()
Diffstat (limited to 'src/mesa')
-rw-r--r--src/mesa/swrast/s_span.c64
1 files changed, 40 insertions, 24 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 7ae9f7ffb6..0adab5ef16 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -1212,11 +1212,15 @@ add_specular(GLcontext *ctx, SWspan *span)
/**
* Convert the span's color arrays to the given type.
+ * XXX this could be put into image.c and reused in several places.
*/
static void
convert_color_type(GLcontext *ctx, SWspan *span, GLenum newType)
{
const GLubyte *mask = span->array->mask;
+ /* XXX NOTE: These all point to the same memory!
+ * We need to use temporaray storage when converting, below.
+ */
GLubyte (*rgba1)[4] = span->array->color.sz1.rgba;
GLushort (*rgba2)[4] = span->array->color.sz2.rgba;
GLfloat (*rgba4)[4] = span->array->color.sz4.rgba;
@@ -1226,77 +1230,89 @@ convert_color_type(GLcontext *ctx, SWspan *span, GLenum newType)
switch (span->array->ChanType) {
case GL_UNSIGNED_BYTE:
if (newType == GL_UNSIGNED_SHORT) {
+ GLushort newVals[MAX_WIDTH][4];
GLuint i;
for (i = 0; i < span->end; i++) {
if (mask[i]) {
- rgba2[i][RCOMP] = UBYTE_TO_USHORT(rgba1[i][RCOMP]);
- rgba2[i][GCOMP] = UBYTE_TO_USHORT(rgba1[i][GCOMP]);
- rgba2[i][BCOMP] = UBYTE_TO_USHORT(rgba1[i][BCOMP]);
- rgba2[i][ACOMP] = UBYTE_TO_USHORT(rgba1[i][ACOMP]);
+ newVals[i][RCOMP] = UBYTE_TO_USHORT(rgba1[i][RCOMP]);
+ newVals[i][GCOMP] = UBYTE_TO_USHORT(rgba1[i][GCOMP]);
+ newVals[i][BCOMP] = UBYTE_TO_USHORT(rgba1[i][BCOMP]);
+ newVals[i][ACOMP] = UBYTE_TO_USHORT(rgba1[i][ACOMP]);
}
}
+ _mesa_memcpy(rgba2, newVals, span->end * 4 * sizeof(GLushort));
}
else {
+ GLfloat newVals[MAX_WIDTH][4];
GLuint i;
ASSERT(newType == GL_FLOAT);
for (i = 0; i < span->end; i++) {
if (mask[i]) {
- rgba4[i][RCOMP] = UBYTE_TO_FLOAT(rgba1[i][RCOMP]);
- rgba4[i][GCOMP] = UBYTE_TO_FLOAT(rgba1[i][GCOMP]);
- rgba4[i][BCOMP] = UBYTE_TO_FLOAT(rgba1[i][BCOMP]);
- rgba4[i][ACOMP] = UBYTE_TO_FLOAT(rgba1[i][ACOMP]);
+ newVals[i][RCOMP] = UBYTE_TO_FLOAT(rgba1[i][RCOMP]);
+ newVals[i][GCOMP] = UBYTE_TO_FLOAT(rgba1[i][GCOMP]);
+ newVals[i][BCOMP] = UBYTE_TO_FLOAT(rgba1[i][BCOMP]);
+ newVals[i][ACOMP] = UBYTE_TO_FLOAT(rgba1[i][ACOMP]);
}
}
+ _mesa_memcpy(rgba4, newVals, span->end * 4 * sizeof(GLfloat));
}
break;
case GL_UNSIGNED_SHORT:
if (newType == GL_UNSIGNED_BYTE) {
+ GLubyte newVals[MAX_WIDTH][4];
GLuint i;
for (i = 0; i < span->end; i++) {
if (mask[i]) {
- rgba1[i][RCOMP] = USHORT_TO_UBYTE(rgba2[i][RCOMP]);
- rgba1[i][GCOMP] = USHORT_TO_UBYTE(rgba2[i][GCOMP]);
- rgba1[i][BCOMP] = USHORT_TO_UBYTE(rgba2[i][BCOMP]);
- rgba1[i][ACOMP] = USHORT_TO_UBYTE(rgba2[i][ACOMP]);
+ newVals[i][RCOMP] = USHORT_TO_UBYTE(rgba2[i][RCOMP]);
+ newVals[i][GCOMP] = USHORT_TO_UBYTE(rgba2[i][GCOMP]);
+ newVals[i][BCOMP] = USHORT_TO_UBYTE(rgba2[i][BCOMP]);
+ newVals[i][ACOMP] = USHORT_TO_UBYTE(rgba2[i][ACOMP]);
}
}
+ _mesa_memcpy(rgba1, newVals, span->end * 4 * sizeof(GLubyte));
}
else {
+ GLfloat newVals[MAX_WIDTH][4];
GLuint i;
ASSERT(newType == GL_FLOAT);
for (i = 0; i < span->end; i++) {
if (mask[i]) {
- rgba4[i][RCOMP] = USHORT_TO_FLOAT(rgba2[i][RCOMP]);
- rgba4[i][GCOMP] = USHORT_TO_FLOAT(rgba2[i][GCOMP]);
- rgba4[i][BCOMP] = USHORT_TO_FLOAT(rgba2[i][BCOMP]);
- rgba4[i][ACOMP] = USHORT_TO_FLOAT(rgba2[i][ACOMP]);
+ newVals[i][RCOMP] = USHORT_TO_FLOAT(rgba2[i][RCOMP]);
+ newVals[i][GCOMP] = USHORT_TO_FLOAT(rgba2[i][GCOMP]);
+ newVals[i][BCOMP] = USHORT_TO_FLOAT(rgba2[i][BCOMP]);
+ newVals[i][ACOMP] = USHORT_TO_FLOAT(rgba2[i][ACOMP]);
}
}
+ _mesa_memcpy(rgba4, newVals, span->end * 4 * sizeof(GLfloat));
}
break;
case GL_FLOAT:
if (newType == GL_UNSIGNED_BYTE) {
+ GLubyte newVals[MAX_WIDTH][4];
GLuint i;
for (i = 0; i < span->end; i++) {
if (mask[i]) {
- UNCLAMPED_FLOAT_TO_UBYTE(rgba1[i][RCOMP], rgba4[i][RCOMP]);
- UNCLAMPED_FLOAT_TO_UBYTE(rgba1[i][GCOMP], rgba4[i][GCOMP]);
- UNCLAMPED_FLOAT_TO_UBYTE(rgba1[i][BCOMP], rgba4[i][BCOMP]);
- UNCLAMPED_FLOAT_TO_UBYTE(rgba1[i][ACOMP], rgba4[i][ACOMP]);
+ UNCLAMPED_FLOAT_TO_UBYTE(newVals[i][RCOMP], rgba4[i][RCOMP]);
+ UNCLAMPED_FLOAT_TO_UBYTE(newVals[i][GCOMP], rgba4[i][GCOMP]);
+ UNCLAMPED_FLOAT_TO_UBYTE(newVals[i][BCOMP], rgba4[i][BCOMP]);
+ UNCLAMPED_FLOAT_TO_UBYTE(newVals[i][ACOMP], rgba4[i][ACOMP]);
}
}
+ _mesa_memcpy(rgba1, newVals, span->end * 4 * sizeof(GLubyte));
}
else {
+ GLushort newVals[MAX_WIDTH][4];
GLuint i;
ASSERT(newType == GL_UNSIGNED_SHORT);
for (i = 0; i < span->end; i++) {
if (mask[i]) {
- UNCLAMPED_FLOAT_TO_USHORT(rgba2[i][RCOMP], rgba4[i][RCOMP]);
- UNCLAMPED_FLOAT_TO_USHORT(rgba2[i][GCOMP], rgba4[i][GCOMP]);
- UNCLAMPED_FLOAT_TO_USHORT(rgba2[i][BCOMP], rgba4[i][BCOMP]);
- UNCLAMPED_FLOAT_TO_USHORT(rgba2[i][ACOMP], rgba4[i][ACOMP]);
+ UNCLAMPED_FLOAT_TO_USHORT(newVals[i][RCOMP], rgba4[i][RCOMP]);
+ UNCLAMPED_FLOAT_TO_USHORT(newVals[i][GCOMP], rgba4[i][GCOMP]);
+ UNCLAMPED_FLOAT_TO_USHORT(newVals[i][BCOMP], rgba4[i][BCOMP]);
+ UNCLAMPED_FLOAT_TO_USHORT(newVals[i][ACOMP], rgba4[i][ACOMP]);
}
}
+ _mesa_memcpy(rgba2, newVals, span->end * 4 * sizeof(GLushort));
}
break;
default: