summaryrefslogtreecommitdiff
path: root/src/mesa/main/histogram.c
diff options
context:
space:
mode:
authorAlex Heck <nesl247@beryl-project.org>2007-03-17 19:55:09 -0400
committerAlex Heck <nesl247@beryl-project.org>2007-03-17 19:55:09 -0400
commit3c464a6f450c7b9e5f35460458e4d37a9be15f6e (patch)
treec98caeee9b16d98fee3db95977a713b25bb7919b /src/mesa/main/histogram.c
parentd34c1c65bd18eaaae2d1da2a32654916477cb86f (diff)
downloadberyl-mesa-master.tar.gz
beryl-mesa-master.tar.bz2
Added missing filesHEADmaster
Diffstat (limited to 'src/mesa/main/histogram.c')
-rw-r--r--src/mesa/main/histogram.c1187
1 files changed, 1187 insertions, 0 deletions
diff --git a/src/mesa/main/histogram.c b/src/mesa/main/histogram.c
new file mode 100644
index 0000000..29aced0
--- /dev/null
+++ b/src/mesa/main/histogram.c
@@ -0,0 +1,1187 @@
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.3
+ *
+ * Copyright (C) 1999-2004 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.
+ */
+
+
+#include "glheader.h"
+#include "bufferobj.h"
+#include "colormac.h"
+#include "context.h"
+#include "image.h"
+#include "histogram.h"
+
+
+/**********************************************************************
+ * Internal functions
+ */
+
+
+/*
+ * Update the min/max values from an array of fragment colors.
+ */
+void
+_mesa_update_minmax(GLcontext *ctx, GLuint n, const GLfloat rgba[][4])
+{
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ /* update mins */
+ if (rgba[i][RCOMP] < ctx->MinMax.Min[RCOMP])
+ ctx->MinMax.Min[RCOMP] = rgba[i][RCOMP];
+ if (rgba[i][GCOMP] < ctx->MinMax.Min[GCOMP])
+ ctx->MinMax.Min[GCOMP] = rgba[i][GCOMP];
+ if (rgba[i][BCOMP] < ctx->MinMax.Min[BCOMP])
+ ctx->MinMax.Min[BCOMP] = rgba[i][BCOMP];
+ if (rgba[i][ACOMP] < ctx->MinMax.Min[ACOMP])
+ ctx->MinMax.Min[ACOMP] = rgba[i][ACOMP];
+
+ /* update maxs */
+ if (rgba[i][RCOMP] > ctx->MinMax.Max[RCOMP])
+ ctx->MinMax.Max[RCOMP] = rgba[i][RCOMP];
+ if (rgba[i][GCOMP] > ctx->MinMax.Max[GCOMP])
+ ctx->MinMax.Max[GCOMP] = rgba[i][GCOMP];
+ if (rgba[i][BCOMP] > ctx->MinMax.Max[BCOMP])
+ ctx->MinMax.Max[BCOMP] = rgba[i][BCOMP];
+ if (rgba[i][ACOMP] > ctx->MinMax.Max[ACOMP])
+ ctx->MinMax.Max[ACOMP] = rgba[i][ACOMP];
+ }
+}
+
+
+/*
+ * Update the histogram values from an array of fragment colors.
+ */
+void
+_mesa_update_histogram(GLcontext *ctx, GLuint n, const GLfloat rgba[][4])
+{
+ const GLint max = ctx->Histogram.Width - 1;
+ GLfloat w = (GLfloat) max;
+ GLuint i;
+
+ if (ctx->Histogram.Width == 0)
+ return;
+
+ for (i = 0; i < n; i++) {
+ GLint ri = IROUND(rgba[i][RCOMP] * w);
+ GLint gi = IROUND(rgba[i][GCOMP] * w);
+ GLint bi = IROUND(rgba[i][BCOMP] * w);
+ GLint ai = IROUND(rgba[i][ACOMP] * w);
+ ri = CLAMP(ri, 0, max);
+ gi = CLAMP(gi, 0, max);
+ bi = CLAMP(bi, 0, max);
+ ai = CLAMP(ai, 0, max);
+ ctx->Histogram.Count[ri][RCOMP]++;
+ ctx->Histogram.Count[gi][GCOMP]++;
+ ctx->Histogram.Count[bi][BCOMP]++;
+ ctx->Histogram.Count[ai][ACOMP]++;
+ }
+}
+
+
+/*
+ * XXX the packed pixel formats haven't been tested.
+ */
+static void
+pack_histogram( GLcontext *ctx,
+ GLuint n, CONST GLuint rgba[][4],
+ GLenum format, GLenum type, GLvoid *destination,
+ const struct gl_pixelstore_attrib *packing )
+{
+ const GLint comps = _mesa_components_in_format(format);
+ GLuint luminance[MAX_WIDTH];
+
+ if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA) {
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ luminance[i] = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ }
+ }
+
+#define PACK_MACRO(TYPE) \
+ { \
+ GLuint i; \
+ switch (format) { \
+ case GL_RED: \
+ for (i=0;i<n;i++) \
+ dst[i] = (TYPE) rgba[i][RCOMP]; \
+ break; \
+ case GL_GREEN: \
+ for (i=0;i<n;i++) \
+ dst[i] = (TYPE) rgba[i][GCOMP]; \
+ break; \
+ case GL_BLUE: \
+ for (i=0;i<n;i++) \
+ dst[i] = (TYPE) rgba[i][BCOMP]; \
+ break; \
+ case GL_ALPHA: \
+ for (i=0;i<n;i++) \
+ dst[i] = (TYPE) rgba[i][ACOMP]; \
+ break; \
+ case GL_LUMINANCE: \
+ for (i=0;i<n;i++) \
+ dst[i] = (TYPE) luminance[i]; \
+ break; \
+ case GL_LUMINANCE_ALPHA: \
+ for (i=0;i<n;i++) { \
+ dst[i*2+0] = (TYPE) luminance[i]; \
+ dst[i*2+1] = (TYPE) rgba[i][ACOMP]; \
+ } \
+ break; \
+ case GL_RGB: \
+ for (i=0;i<n;i++) { \
+ dst[i*3+0] = (TYPE) rgba[i][RCOMP]; \
+ dst[i*3+1] = (TYPE) rgba[i][GCOMP]; \
+ dst[i*3+2] = (TYPE) rgba[i][BCOMP]; \
+ } \
+ break; \
+ case GL_RGBA: \
+ for (i=0;i<n;i++) { \
+ dst[i*4+0] = (TYPE) rgba[i][RCOMP]; \
+ dst[i*4+1] = (TYPE) rgba[i][GCOMP]; \
+ dst[i*4+2] = (TYPE) rgba[i][BCOMP]; \
+ dst[i*4+3] = (TYPE) rgba[i][ACOMP]; \
+ } \
+ break; \
+ case GL_BGR: \
+ for (i=0;i<n;i++) { \
+ dst[i*3+0] = (TYPE) rgba[i][BCOMP]; \
+ dst[i*3+1] = (TYPE) rgba[i][GCOMP]; \
+ dst[i*3+2] = (TYPE) rgba[i][RCOMP]; \
+ } \
+ break; \
+ case GL_BGRA: \
+ for (i=0;i<n;i++) { \
+ dst[i*4+0] = (TYPE) rgba[i][BCOMP]; \
+ dst[i*4+1] = (TYPE) rgba[i][GCOMP]; \
+ dst[i*4+2] = (TYPE) rgba[i][RCOMP]; \
+ dst[i*4+3] = (TYPE) rgba[i][ACOMP]; \
+ } \
+ break; \
+ case GL_ABGR_EXT: \
+ for (i=0;i<n;i++) { \
+ dst[i*4+0] = (TYPE) rgba[i][ACOMP]; \
+ dst[i*4+1] = (TYPE) rgba[i][BCOMP]; \
+ dst[i*4+2] = (TYPE) rgba[i][GCOMP]; \
+ dst[i*4+3] = (TYPE) rgba[i][RCOMP]; \
+ } \
+ break; \
+ default: \
+ _mesa_problem(ctx, "bad format in pack_histogram"); \
+ } \
+ }
+
+ switch (type) {
+ case GL_UNSIGNED_BYTE:
+ {
+ GLubyte *dst = (GLubyte *) destination;
+ PACK_MACRO(GLubyte);
+ }
+ break;
+ case GL_BYTE:
+ {
+ GLbyte *dst = (GLbyte *) destination;
+ PACK_MACRO(GLbyte);
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ {
+ GLushort *dst = (GLushort *) destination;
+ PACK_MACRO(GLushort);
+ if (packing->SwapBytes) {
+ _mesa_swap2(dst, n * comps);
+ }
+ }
+ break;
+ case GL_SHORT:
+ {
+ GLshort *dst = (GLshort *) destination;
+ PACK_MACRO(GLshort);
+ if (packing->SwapBytes) {
+ _mesa_swap2((GLushort *) dst, n * comps);
+ }
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ {
+ GLuint *dst = (GLuint *) destination;
+ PACK_MACRO(GLuint);
+ if (packing->SwapBytes) {
+ _mesa_swap4(dst, n * comps);
+ }
+ }
+ break;
+ case GL_INT:
+ {
+ GLint *dst = (GLint *) destination;
+ PACK_MACRO(GLint);
+ if (packing->SwapBytes) {
+ _mesa_swap4((GLuint *) dst, n * comps);
+ }
+ }
+ break;
+ case GL_FLOAT:
+ {
+ GLfloat *dst = (GLfloat *) destination;
+ PACK_MACRO(GLfloat);
+ if (packing->SwapBytes) {
+ _mesa_swap4((GLuint *) dst, n * comps);
+ }
+ }
+ break;
+ case GL_HALF_FLOAT_ARB:
+ {
+ /* temporarily store as GLuints */
+ GLuint temp[4*HISTOGRAM_TABLE_SIZE];
+ GLhalfARB *dst = (GLhalfARB *) destination;
+ GLuint i;
+ /* get GLuint values */
+ PACK_MACRO(GLuint);
+ /* convert to GLhalf */
+ for (i = 0; i < n * comps; i++) {
+ dst[i] = _mesa_float_to_half((GLfloat) temp[i]);
+ }
+ if (packing->SwapBytes) {
+ _mesa_swap2((GLushort *) dst, n * comps);
+ }
+ }
+ break;
+ case GL_UNSIGNED_BYTE_3_3_2:
+ if (format == GL_RGB) {
+ GLubyte *dst = (GLubyte *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0x7) << 5)
+ | ((rgba[i][GCOMP] & 0x7) << 2)
+ | ((rgba[i][BCOMP] & 0x3) );
+ }
+ }
+ else {
+ GLubyte *dst = (GLubyte *) destination;
+ GLuint i;
+ ASSERT(format == GL_BGR);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][BCOMP] & 0x7) << 5)
+ | ((rgba[i][GCOMP] & 0x7) << 2)
+ | ((rgba[i][RCOMP] & 0x3) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_BYTE_2_3_3_REV:
+ if (format == GL_RGB) {
+ GLubyte *dst = (GLubyte *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0x3) << 6)
+ | ((rgba[i][GCOMP] & 0x7) << 3)
+ | ((rgba[i][BCOMP] & 0x7) );
+ }
+ }
+ else {
+ GLubyte *dst = (GLubyte *) destination;
+ GLuint i;
+ ASSERT(format == GL_BGR);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][BCOMP] & 0x3) << 6)
+ | ((rgba[i][GCOMP] & 0x7) << 3)
+ | ((rgba[i][RCOMP] & 0x7) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT_5_6_5:
+ if (format == GL_RGB) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0x1f) << 11)
+ | ((rgba[i][GCOMP] & 0x3f) << 5)
+ | ((rgba[i][BCOMP] & 0x1f) );
+ }
+ }
+ else {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ ASSERT(format == GL_BGR);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][BCOMP] & 0x1f) << 11)
+ | ((rgba[i][GCOMP] & 0x3f) << 5)
+ | ((rgba[i][RCOMP] & 0x1f) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT_5_6_5_REV:
+ if (format == GL_RGB) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][BCOMP] & 0x1f) << 11)
+ | ((rgba[i][GCOMP] & 0x3f) << 5)
+ | ((rgba[i][RCOMP] & 0x1f) );
+ }
+ }
+ else {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ ASSERT(format == GL_BGR);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0x1f) << 11)
+ | ((rgba[i][GCOMP] & 0x3f) << 5)
+ | ((rgba[i][BCOMP] & 0x1f) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT_4_4_4_4:
+ if (format == GL_RGBA) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0xf) << 12)
+ | ((rgba[i][GCOMP] & 0xf) << 8)
+ | ((rgba[i][BCOMP] & 0xf) << 4)
+ | ((rgba[i][ACOMP] & 0xf) );
+ }
+ }
+ else if (format == GL_BGRA) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][BCOMP] & 0xf) << 12)
+ | ((rgba[i][GCOMP] & 0xf) << 8)
+ | ((rgba[i][RCOMP] & 0xf) << 4)
+ | ((rgba[i][ACOMP] & 0xf) );
+ }
+ }
+ else {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ ASSERT(format == GL_ABGR_EXT);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0xf) << 12)
+ | ((rgba[i][BCOMP] & 0xf) << 8)
+ | ((rgba[i][GCOMP] & 0xf) << 4)
+ | ((rgba[i][RCOMP] & 0xf) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+ if (format == GL_RGBA) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0xf) << 12)
+ | ((rgba[i][BCOMP] & 0xf) << 8)
+ | ((rgba[i][GCOMP] & 0xf) << 4)
+ | ((rgba[i][RCOMP] & 0xf) );
+ }
+ }
+ else if (format == GL_BGRA) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0xf) << 12)
+ | ((rgba[i][RCOMP] & 0xf) << 8)
+ | ((rgba[i][GCOMP] & 0xf) << 4)
+ | ((rgba[i][BCOMP] & 0xf) );
+ }
+ }
+ else {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ ASSERT(format == GL_ABGR_EXT);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0xf) << 12)
+ | ((rgba[i][GCOMP] & 0xf) << 8)
+ | ((rgba[i][BCOMP] & 0xf) << 4)
+ | ((rgba[i][ACOMP] & 0xf) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT_5_5_5_1:
+ if (format == GL_RGBA) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0x1f) << 11)
+ | ((rgba[i][GCOMP] & 0x1f) << 6)
+ | ((rgba[i][BCOMP] & 0x1f) << 1)
+ | ((rgba[i][ACOMP] & 0x1) );
+ }
+ }
+ else if (format == GL_BGRA) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][BCOMP] & 0x1f) << 11)
+ | ((rgba[i][GCOMP] & 0x1f) << 6)
+ | ((rgba[i][RCOMP] & 0x1f) << 1)
+ | ((rgba[i][ACOMP] & 0x1) );
+ }
+ }
+ else {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ ASSERT(format == GL_ABGR_EXT);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0x1f) << 11)
+ | ((rgba[i][BCOMP] & 0x1f) << 6)
+ | ((rgba[i][GCOMP] & 0x1f) << 1)
+ | ((rgba[i][RCOMP] & 0x1) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+ if (format == GL_RGBA) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0x1f) << 11)
+ | ((rgba[i][BCOMP] & 0x1f) << 6)
+ | ((rgba[i][GCOMP] & 0x1f) << 1)
+ | ((rgba[i][RCOMP] & 0x1) );
+ }
+ }
+ else if (format == GL_BGRA) {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0x1f) << 11)
+ | ((rgba[i][RCOMP] & 0x1f) << 6)
+ | ((rgba[i][GCOMP] & 0x1f) << 1)
+ | ((rgba[i][BCOMP] & 0x1) );
+ }
+ }
+ else {
+ GLushort *dst = (GLushort *) destination;
+ GLuint i;
+ ASSERT(format == GL_ABGR_EXT);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0x1f) << 11)
+ | ((rgba[i][GCOMP] & 0x1f) << 6)
+ | ((rgba[i][BCOMP] & 0x1f) << 1)
+ | ((rgba[i][ACOMP] & 0x1) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_INT_8_8_8_8:
+ if (format == GL_RGBA) {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0xff) << 24)
+ | ((rgba[i][GCOMP] & 0xff) << 16)
+ | ((rgba[i][BCOMP] & 0xff) << 8)
+ | ((rgba[i][ACOMP] & 0xff) );
+ }
+ }
+ else if (format == GL_BGRA) {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][BCOMP] & 0xff) << 24)
+ | ((rgba[i][GCOMP] & 0xff) << 16)
+ | ((rgba[i][RCOMP] & 0xff) << 8)
+ | ((rgba[i][ACOMP] & 0xff) );
+ }
+ }
+ else {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ ASSERT(format == GL_ABGR_EXT);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0xff) << 24)
+ | ((rgba[i][BCOMP] & 0xff) << 16)
+ | ((rgba[i][GCOMP] & 0xff) << 8)
+ | ((rgba[i][RCOMP] & 0xff) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_INT_8_8_8_8_REV:
+ if (format == GL_RGBA) {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0xff) << 24)
+ | ((rgba[i][BCOMP] & 0xff) << 16)
+ | ((rgba[i][GCOMP] & 0xff) << 8)
+ | ((rgba[i][RCOMP] & 0xff) );
+ }
+ }
+ else if (format == GL_BGRA) {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0xff) << 24)
+ | ((rgba[i][RCOMP] & 0xff) << 16)
+ | ((rgba[i][GCOMP] & 0xff) << 8)
+ | ((rgba[i][BCOMP] & 0xff) );
+ }
+ }
+ else {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ ASSERT(format == GL_ABGR_EXT);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0xff) << 24)
+ | ((rgba[i][GCOMP] & 0xff) << 16)
+ | ((rgba[i][BCOMP] & 0xff) << 8)
+ | ((rgba[i][ACOMP] & 0xff) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_INT_10_10_10_2:
+ if (format == GL_RGBA) {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0x3ff) << 22)
+ | ((rgba[i][GCOMP] & 0x3ff) << 12)
+ | ((rgba[i][BCOMP] & 0x3ff) << 2)
+ | ((rgba[i][ACOMP] & 0x3) );
+ }
+ }
+ else if (format == GL_BGRA) {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][BCOMP] & 0x3ff) << 22)
+ | ((rgba[i][GCOMP] & 0x3ff) << 12)
+ | ((rgba[i][RCOMP] & 0x3ff) << 2)
+ | ((rgba[i][ACOMP] & 0x3) );
+ }
+ }
+ else {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ ASSERT(format == GL_ABGR_EXT);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0x3ff) << 22)
+ | ((rgba[i][BCOMP] & 0x3ff) << 12)
+ | ((rgba[i][GCOMP] & 0x3ff) << 2)
+ | ((rgba[i][RCOMP] & 0x3) );
+ }
+ }
+ break;
+ case GL_UNSIGNED_INT_2_10_10_10_REV:
+ if (format == GL_RGBA) {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0x3ff) << 22)
+ | ((rgba[i][BCOMP] & 0x3ff) << 12)
+ | ((rgba[i][GCOMP] & 0x3ff) << 2)
+ | ((rgba[i][RCOMP] & 0x3) );
+ }
+ }
+ else if (format == GL_BGRA) {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][ACOMP] & 0x3ff) << 22)
+ | ((rgba[i][RCOMP] & 0x3ff) << 12)
+ | ((rgba[i][GCOMP] & 0x3ff) << 2)
+ | ((rgba[i][BCOMP] & 0x3) );
+ }
+ }
+ else {
+ GLuint *dst = (GLuint *) destination;
+ GLuint i;
+ ASSERT(format == GL_ABGR_EXT);
+ for (i = 0; i < n; i++) {
+ dst[i] = ((rgba[i][RCOMP] & 0x3ff) << 22)
+ | ((rgba[i][GCOMP] & 0x3ff) << 12)
+ | ((rgba[i][BCOMP] & 0x3ff) << 2)
+ | ((rgba[i][ACOMP] & 0x3) );
+ }
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad type in pack_histogram");
+ }
+
+#undef PACK_MACRO
+}
+
+
+/*
+ * Given an internalFormat token passed to glHistogram or glMinMax,
+ * return the corresponding base format.
+ * Return -1 if invalid token.
+ */
+static GLint
+base_histogram_format( GLenum format )
+{
+ switch (format) {
+ case GL_ALPHA:
+ case GL_ALPHA4:
+ case GL_ALPHA8:
+ case GL_ALPHA12:
+ case GL_ALPHA16:
+ return GL_ALPHA;
+ case GL_LUMINANCE:
+ case GL_LUMINANCE4:
+ case GL_LUMINANCE8:
+ case GL_LUMINANCE12:
+ case GL_LUMINANCE16:
+ return GL_LUMINANCE;
+ case GL_LUMINANCE_ALPHA:
+ case GL_LUMINANCE4_ALPHA4:
+ case GL_LUMINANCE6_ALPHA2:
+ case GL_LUMINANCE8_ALPHA8:
+ case GL_LUMINANCE12_ALPHA4:
+ case GL_LUMINANCE12_ALPHA12:
+ case GL_LUMINANCE16_ALPHA16:
+ return GL_LUMINANCE_ALPHA;
+ case GL_RGB:
+ case GL_R3_G3_B2:
+ case GL_RGB4:
+ case GL_RGB5:
+ case GL_RGB8:
+ case GL_RGB10:
+ case GL_RGB12:
+ case GL_RGB16:
+ return GL_RGB;
+ case GL_RGBA:
+ case GL_RGBA2:
+ case GL_RGBA4:
+ case GL_RGB5_A1:
+ case GL_RGBA8:
+ case GL_RGB10_A2:
+ case GL_RGBA12:
+ case GL_RGBA16:
+ return GL_RGBA;
+ default:
+ return -1; /* error */
+ }
+}
+
+
+
+/**********************************************************************
+ * API functions
+ */
+
+
+void GLAPIENTRY
+_mesa_GetMinmax(GLenum target, GLboolean reset, GLenum format, GLenum type, GLvoid *values)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetMinmax");
+ return;
+ }
+
+ if (target != GL_MINMAX) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinmax(target)");
+ return;
+ }
+
+ if (format != GL_RED &&
+ format != GL_GREEN &&
+ format != GL_BLUE &&
+ format != GL_ALPHA &&
+ format != GL_RGB &&
+ format != GL_BGR &&
+ format != GL_RGBA &&
+ format != GL_BGRA &&
+ format != GL_ABGR_EXT &&
+ format != GL_LUMINANCE &&
+ format != GL_LUMINANCE_ALPHA) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinMax(format)");
+ }
+
+ if (!_mesa_is_legal_format_and_type(ctx, format, type)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetMinmax(format or type)");
+ return;
+ }
+
+ if (ctx->Pack.BufferObj->Name) {
+ /* pack min/max values into a PBO */
+ GLubyte *buf;
+ if (!_mesa_validate_pbo_access(1, &ctx->Pack, 2, 1, 1,
+ format, type, values)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glGetMinMax(invalid PBO access)");
+ return;
+ }
+ buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+ GL_WRITE_ONLY_ARB,
+ ctx->Pack.BufferObj);
+ if (!buf) {
+ /* buffer is already mapped - that's an error */
+ _mesa_error(ctx, GL_INVALID_OPERATION,"glGetMinMax(PBO is mapped)");
+ return;
+ }
+ values = ADD_POINTERS(buf, values);
+ }
+ else if (!values) {
+ /* not an error */
+ return;
+ }
+
+ {
+ GLfloat minmax[2][4];
+ minmax[0][RCOMP] = CLAMP(ctx->MinMax.Min[RCOMP], 0.0F, 1.0F);
+ minmax[0][GCOMP] = CLAMP(ctx->MinMax.Min[GCOMP], 0.0F, 1.0F);
+ minmax[0][BCOMP] = CLAMP(ctx->MinMax.Min[BCOMP], 0.0F, 1.0F);
+ minmax[0][ACOMP] = CLAMP(ctx->MinMax.Min[ACOMP], 0.0F, 1.0F);
+ minmax[1][RCOMP] = CLAMP(ctx->MinMax.Max[RCOMP], 0.0F, 1.0F);
+ minmax[1][GCOMP] = CLAMP(ctx->MinMax.Max[GCOMP], 0.0F, 1.0F);
+ minmax[1][BCOMP] = CLAMP(ctx->MinMax.Max[BCOMP], 0.0F, 1.0F);
+ minmax[1][ACOMP] = CLAMP(ctx->MinMax.Max[ACOMP], 0.0F, 1.0F);
+ _mesa_pack_rgba_span_float(ctx, 2, (CONST GLfloat (*)[4]) minmax,
+ format, type, values, &ctx->Pack, 0);
+ }
+
+ if (ctx->Pack.BufferObj->Name) {
+ ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+ ctx->Pack.BufferObj);
+ }
+
+ if (reset) {
+ _mesa_ResetMinmax(GL_MINMAX);
+ }
+}
+
+
+void GLAPIENTRY
+_mesa_GetHistogram(GLenum target, GLboolean reset, GLenum format, GLenum type, GLvoid *values)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetHistogram");
+ return;
+ }
+
+ if (target != GL_HISTOGRAM) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogram(target)");
+ return;
+ }
+
+ if (format != GL_RED &&
+ format != GL_GREEN &&
+ format != GL_BLUE &&
+ format != GL_ALPHA &&
+ format != GL_RGB &&
+ format != GL_BGR &&
+ format != GL_RGBA &&
+ format != GL_BGRA &&
+ format != GL_ABGR_EXT &&
+ format != GL_LUMINANCE &&
+ format != GL_LUMINANCE_ALPHA) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogram(format)");
+ }
+
+ if (!_mesa_is_legal_format_and_type(ctx, format, type)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetHistogram(format or type)");
+ return;
+ }
+
+ if (ctx->Pack.BufferObj->Name) {
+ /* pack min/max values into a PBO */
+ GLubyte *buf;
+ if (!_mesa_validate_pbo_access(1, &ctx->Pack, ctx->Histogram.Width, 1, 1,
+ format, type, values)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glGetHistogram(invalid PBO access)");
+ return;
+ }
+ buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+ GL_WRITE_ONLY_ARB,
+ ctx->Pack.BufferObj);
+ if (!buf) {
+ /* buffer is already mapped - that's an error */
+ _mesa_error(ctx,GL_INVALID_OPERATION,"glGetHistogram(PBO is mapped)");
+ return;
+ }
+ values = ADD_POINTERS(buf, values);
+ }
+ else if (!values) {
+ /* not an error */
+ return;
+ }
+
+ pack_histogram(ctx, ctx->Histogram.Width,
+ (CONST GLuint (*)[4]) ctx->Histogram.Count,
+ format, type, values, &ctx->Pack);
+
+ if (ctx->Pack.BufferObj->Name) {
+ ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+ ctx->Pack.BufferObj);
+ }
+
+ if (reset) {
+ GLuint i;
+ for (i = 0; i < HISTOGRAM_TABLE_SIZE; i++) {
+ ctx->Histogram.Count[i][0] = 0;
+ ctx->Histogram.Count[i][1] = 0;
+ ctx->Histogram.Count[i][2] = 0;
+ ctx->Histogram.Count[i][3] = 0;
+ }
+ }
+}
+
+
+void GLAPIENTRY
+_mesa_GetHistogramParameterfv(GLenum target, GLenum pname, GLfloat *params)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetHistogramParameterfv");
+ return;
+ }
+
+ if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameterfv(target)");
+ return;
+ }
+
+ switch (pname) {
+ case GL_HISTOGRAM_WIDTH:
+ *params = (GLfloat) ctx->Histogram.Width;
+ break;
+ case GL_HISTOGRAM_FORMAT:
+ *params = (GLfloat) ctx->Histogram.Format;
+ break;
+ case GL_HISTOGRAM_RED_SIZE:
+ *params = (GLfloat) ctx->Histogram.RedSize;
+ break;
+ case GL_HISTOGRAM_GREEN_SIZE:
+ *params = (GLfloat) ctx->Histogram.GreenSize;
+ break;
+ case GL_HISTOGRAM_BLUE_SIZE:
+ *params = (GLfloat) ctx->Histogram.BlueSize;
+ break;
+ case GL_HISTOGRAM_ALPHA_SIZE:
+ *params = (GLfloat) ctx->Histogram.AlphaSize;
+ break;
+ case GL_HISTOGRAM_LUMINANCE_SIZE:
+ *params = (GLfloat) ctx->Histogram.LuminanceSize;
+ break;
+ case GL_HISTOGRAM_SINK:
+ *params = (GLfloat) ctx->Histogram.Sink;
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameterfv(pname)");
+ }
+}
+
+
+void GLAPIENTRY
+_mesa_GetHistogramParameteriv(GLenum target, GLenum pname, GLint *params)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetHistogramParameteriv");
+ return;
+ }
+
+ if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameteriv(target)");
+ return;
+ }
+
+ switch (pname) {
+ case GL_HISTOGRAM_WIDTH:
+ *params = (GLint) ctx->Histogram.Width;
+ break;
+ case GL_HISTOGRAM_FORMAT:
+ *params = (GLint) ctx->Histogram.Format;
+ break;
+ case GL_HISTOGRAM_RED_SIZE:
+ *params = (GLint) ctx->Histogram.RedSize;
+ break;
+ case GL_HISTOGRAM_GREEN_SIZE:
+ *params = (GLint) ctx->Histogram.GreenSize;
+ break;
+ case GL_HISTOGRAM_BLUE_SIZE:
+ *params = (GLint) ctx->Histogram.BlueSize;
+ break;
+ case GL_HISTOGRAM_ALPHA_SIZE:
+ *params = (GLint) ctx->Histogram.AlphaSize;
+ break;
+ case GL_HISTOGRAM_LUMINANCE_SIZE:
+ *params = (GLint) ctx->Histogram.LuminanceSize;
+ break;
+ case GL_HISTOGRAM_SINK:
+ *params = (GLint) ctx->Histogram.Sink;
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameteriv(pname)");
+ }
+}
+
+
+void GLAPIENTRY
+_mesa_GetMinmaxParameterfv(GLenum target, GLenum pname, GLfloat *params)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetMinmaxParameterfv");
+ return;
+ }
+ if (target != GL_MINMAX) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinmaxParameterfv(target)");
+ return;
+ }
+ if (pname == GL_MINMAX_FORMAT) {
+ *params = (GLfloat) ctx->MinMax.Format;
+ }
+ else if (pname == GL_MINMAX_SINK) {
+ *params = (GLfloat) ctx->MinMax.Sink;
+ }
+ else {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinMaxParameterfv(pname)");
+ }
+}
+
+
+void GLAPIENTRY
+_mesa_GetMinmaxParameteriv(GLenum target, GLenum pname, GLint *params)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glGetMinmaxParameteriv");
+ return;
+ }
+ if (target != GL_MINMAX) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinmaxParameteriv(target)");
+ return;
+ }
+ if (pname == GL_MINMAX_FORMAT) {
+ *params = (GLint) ctx->MinMax.Format;
+ }
+ else if (pname == GL_MINMAX_SINK) {
+ *params = (GLint) ctx->MinMax.Sink;
+ }
+ else {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinMaxParameteriv(pname)");
+ }
+}
+
+
+void GLAPIENTRY
+_mesa_Histogram(GLenum target, GLsizei width, GLenum internalFormat, GLboolean sink)
+{
+ GLuint i;
+ GLboolean error = GL_FALSE;
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* sideeffects */
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glHistogram");
+ return;
+ }
+
+ if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glHistogram(target)");
+ return;
+ }
+
+ if (width < 0 || width > HISTOGRAM_TABLE_SIZE) {
+ if (target == GL_PROXY_HISTOGRAM) {
+ error = GL_TRUE;
+ }
+ else {
+ if (width < 0)
+ _mesa_error(ctx, GL_INVALID_VALUE, "glHistogram(width)");
+ else
+ _mesa_error(ctx, GL_TABLE_TOO_LARGE, "glHistogram(width)");
+ return;
+ }
+ }
+
+ if (width != 0 && _mesa_bitcount(width) != 1) {
+ if (target == GL_PROXY_HISTOGRAM) {
+ error = GL_TRUE;
+ }
+ else {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glHistogram(width)");
+ return;
+ }
+ }
+
+ if (base_histogram_format(internalFormat) < 0) {
+ if (target == GL_PROXY_HISTOGRAM) {
+ error = GL_TRUE;
+ }
+ else {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glHistogram(internalFormat)");
+ return;
+ }
+ }
+
+ /* reset histograms */
+ for (i = 0; i < HISTOGRAM_TABLE_SIZE; i++) {
+ ctx->Histogram.Count[i][0] = 0;
+ ctx->Histogram.Count[i][1] = 0;
+ ctx->Histogram.Count[i][2] = 0;
+ ctx->Histogram.Count[i][3] = 0;
+ }
+
+ if (error) {
+ ctx->Histogram.Width = 0;
+ ctx->Histogram.Format = 0;
+ ctx->Histogram.RedSize = 0;
+ ctx->Histogram.GreenSize = 0;
+ ctx->Histogram.BlueSize = 0;
+ ctx->Histogram.AlphaSize = 0;
+ ctx->Histogram.LuminanceSize = 0;
+ }
+ else {
+ ctx->Histogram.Width = width;
+ ctx->Histogram.Format = internalFormat;
+ ctx->Histogram.Sink = sink;
+ ctx->Histogram.RedSize = 8 * sizeof(GLuint);
+ ctx->Histogram.GreenSize = 8 * sizeof(GLuint);
+ ctx->Histogram.BlueSize = 8 * sizeof(GLuint);
+ ctx->Histogram.AlphaSize = 8 * sizeof(GLuint);
+ ctx->Histogram.LuminanceSize = 8 * sizeof(GLuint);
+ }
+
+ ctx->NewState |= _NEW_PIXEL;
+}
+
+
+void GLAPIENTRY
+_mesa_Minmax(GLenum target, GLenum internalFormat, GLboolean sink)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glMinmax");
+ return;
+ }
+
+ if (target != GL_MINMAX) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glMinMax(target)");
+ return;
+ }
+
+ if (base_histogram_format(internalFormat) < 0) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glMinMax(internalFormat)");
+ return;
+ }
+
+ if (ctx->MinMax.Sink == sink)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_PIXEL);
+ ctx->MinMax.Sink = sink;
+}
+
+
+void GLAPIENTRY
+_mesa_ResetHistogram(GLenum target)
+{
+ GLuint i;
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* sideeffects */
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glResetHistogram");
+ return;
+ }
+
+ if (target != GL_HISTOGRAM) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glResetHistogram(target)");
+ return;
+ }
+
+ for (i = 0; i < HISTOGRAM_TABLE_SIZE; i++) {
+ ctx->Histogram.Count[i][0] = 0;
+ ctx->Histogram.Count[i][1] = 0;
+ ctx->Histogram.Count[i][2] = 0;
+ ctx->Histogram.Count[i][3] = 0;
+ }
+
+ ctx->NewState |= _NEW_PIXEL;
+}
+
+
+void GLAPIENTRY
+_mesa_ResetMinmax(GLenum target)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glResetMinmax");
+ return;
+ }
+
+ if (target != GL_MINMAX) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glResetMinMax(target)");
+ return;
+ }
+
+ ctx->MinMax.Min[RCOMP] = 1000; ctx->MinMax.Max[RCOMP] = -1000;
+ ctx->MinMax.Min[GCOMP] = 1000; ctx->MinMax.Max[GCOMP] = -1000;
+ ctx->MinMax.Min[BCOMP] = 1000; ctx->MinMax.Max[BCOMP] = -1000;
+ ctx->MinMax.Min[ACOMP] = 1000; ctx->MinMax.Max[ACOMP] = -1000;
+ ctx->NewState |= _NEW_PIXEL;
+}
+
+
+
+/**********************************************************************/
+/***** Initialization *****/
+/**********************************************************************/
+
+void _mesa_init_histogram( GLcontext * ctx )
+{
+ int i;
+
+ /* Histogram group */
+ ctx->Histogram.Width = 0;
+ ctx->Histogram.Format = GL_RGBA;
+ ctx->Histogram.Sink = GL_FALSE;
+ ctx->Histogram.RedSize = 0;
+ ctx->Histogram.GreenSize = 0;
+ ctx->Histogram.BlueSize = 0;
+ ctx->Histogram.AlphaSize = 0;
+ ctx->Histogram.LuminanceSize = 0;
+ for (i = 0; i < HISTOGRAM_TABLE_SIZE; i++) {
+ ctx->Histogram.Count[i][0] = 0;
+ ctx->Histogram.Count[i][1] = 0;
+ ctx->Histogram.Count[i][2] = 0;
+ ctx->Histogram.Count[i][3] = 0;
+ }
+
+ /* Min/Max group */
+ ctx->MinMax.Format = GL_RGBA;
+ ctx->MinMax.Sink = GL_FALSE;
+ ctx->MinMax.Min[RCOMP] = 1000; ctx->MinMax.Max[RCOMP] = -1000;
+ ctx->MinMax.Min[GCOMP] = 1000; ctx->MinMax.Max[GCOMP] = -1000;
+ ctx->MinMax.Min[BCOMP] = 1000; ctx->MinMax.Max[BCOMP] = -1000;
+ ctx->MinMax.Min[ACOMP] = 1000; ctx->MinMax.Max[ACOMP] = -1000;
+}