renamed imaging files to histogram since that's what's inside

1 files changed, 828 insertions, 0 deletions

diff --git a/src/mesa/main/histogram.c b/src/mesa/main/histogram.c
new file mode 100644
index 00000000000..2e3f103f256
--- /dev/null
+++ b/src/mesa/main/histogram.c
@@ -0,0 +1,828 @@
+/* $Id: histogram.c,v 1.1 2000/11/10 18:06:14 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.5
+ *
+ * Copyright (C) 1999-2000  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.
+ */
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include "glheader.h"
+#include "colormac.h"
+#include "context.h"
+#include "image.h"
+#include "histogram.h"
+#include "mmath.h"
+#endif
+
+
+
+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:						\
+            gl_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;
+      default:
+         gl_problem(ctx, "Bad type in pack_histogram");
+   }
+
+#undef PACK_MACRO
+}
+
+
+
+static void
+pack_minmax( GLcontext *ctx, CONST GLfloat minmax[2][4],
+             GLenum format, GLenum type, GLvoid *destination,
+             const struct gl_pixelstore_attrib *packing )
+{
+   const GLint comps = _mesa_components_in_format(format);
+   GLuint luminance[2];
+
+   if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA) {
+      luminance[0] = minmax[0][RCOMP] + minmax[0][GCOMP] + minmax[0][BCOMP];
+      luminance[1] = minmax[1][RCOMP] + minmax[1][GCOMP] + minmax[1][BCOMP];
+   }
+
+#define PACK_MACRO(TYPE, CONVERSION)				\
+   {								\
+      GLuint i;							\
+      switch (format) {						\
+         case GL_RED:						\
+            for (i=0;i<2;i++)					\
+               dst[i] = CONVERSION (minmax[i][RCOMP]);		\
+            break;						\
+         case GL_GREEN:						\
+            for (i=0;i<2;i++)					\
+               dst[i] = CONVERSION (minmax[i][GCOMP]);		\
+            break;						\
+         case GL_BLUE:						\
+            for (i=0;i<2;i++)					\
+               dst[i] = CONVERSION (minmax[i][BCOMP]);		\
+            break;						\
+         case GL_ALPHA:						\
+            for (i=0;i<2;i++)					\
+               dst[i] = CONVERSION (minmax[i][ACOMP]);		\
+            break;						\
+         case GL_LUMINANCE:					\
+            for (i=0;i<2;i++)					\
+               dst[i] = CONVERSION (luminance[i]);		\
+            break;						\
+         case GL_LUMINANCE_ALPHA:				\
+            for (i=0;i<2;i++) {					\
+               dst[i*2+0] = CONVERSION (luminance[i]);		\
+               dst[i*2+1] = CONVERSION (minmax[i][ACOMP]);	\
+            }							\
+            break;						\
+         case GL_RGB:						\
+            for (i=0;i<2;i++) {					\
+               dst[i*3+0] = CONVERSION (minmax[i][RCOMP]);	\
+               dst[i*3+1] = CONVERSION (minmax[i][GCOMP]);	\
+               dst[i*3+2] = CONVERSION (minmax[i][BCOMP]);	\
+            }							\
+            break;						\
+         case GL_RGBA:						\
+            for (i=0;i<2;i++) {					\
+               dst[i*4+0] = CONVERSION (minmax[i][RCOMP]);	\
+               dst[i*4+1] = CONVERSION (minmax[i][GCOMP]);	\
+               dst[i*4+2] = CONVERSION (minmax[i][BCOMP]);	\
+               dst[i*4+3] = CONVERSION (minmax[i][ACOMP]);	\
+            }							\
+            break;						\
+         case GL_BGR:						\
+            for (i=0;i<2;i++) {					\
+               dst[i*3+0] = CONVERSION (minmax[i][BCOMP]);	\
+               dst[i*3+1] = CONVERSION (minmax[i][GCOMP]);	\
+               dst[i*3+2] = CONVERSION (minmax[i][RCOMP]);	\
+            }							\
+            break;						\
+         case GL_BGRA:						\
+            for (i=0;i<2;i++) {					\
+               dst[i*4+0] = CONVERSION (minmax[i][BCOMP]);	\
+               dst[i*4+1] = CONVERSION (minmax[i][GCOMP]);	\
+               dst[i*4+2] = CONVERSION (minmax[i][RCOMP]);	\
+               dst[i*4+3] = CONVERSION (minmax[i][ACOMP]);	\
+            }							\
+            break;						\
+         case GL_ABGR_EXT:					\
+            for (i=0;i<2;i++) {					\
+               dst[i*4+0] = CONVERSION (minmax[i][ACOMP]);	\
+               dst[i*4+1] = CONVERSION (minmax[i][BCOMP]);	\
+               dst[i*4+2] = CONVERSION (minmax[i][GCOMP]);	\
+               dst[i*4+3] = CONVERSION (minmax[i][RCOMP]);	\
+            }							\
+            break;						\
+         default:						\
+            gl_problem(ctx, "bad format in pack_minmax");	\
+      }								\
+   }
+
+   switch (type) {
+      case GL_UNSIGNED_BYTE:
+         {
+            GLubyte *dst = (GLubyte *) destination;
+            PACK_MACRO(GLubyte, FLOAT_TO_UBYTE);
+         }
+         break;
+      case GL_BYTE:
+         {
+            GLbyte *dst = (GLbyte *) destination;
+            PACK_MACRO(GLbyte, FLOAT_TO_BYTE);
+         }
+         break;
+      case GL_UNSIGNED_SHORT:
+         {
+            GLushort *dst = (GLushort *) destination;
+            PACK_MACRO(GLushort, FLOAT_TO_USHORT);
+            if (packing->SwapBytes) {
+               _mesa_swap2(dst, 2 * comps);
+            }
+         }
+         break;
+      case GL_SHORT:
+         {
+            GLshort *dst = (GLshort *) destination;
+            PACK_MACRO(GLshort, FLOAT_TO_SHORT);
+            if (packing->SwapBytes) {
+               _mesa_swap2((GLushort *) dst, 2 * comps);
+            }
+         }
+         break;
+      case GL_UNSIGNED_INT:
+         {
+            GLuint *dst = (GLuint *) destination;
+            PACK_MACRO(GLuint, FLOAT_TO_UINT);
+            if (packing->SwapBytes) {
+               _mesa_swap4(dst, 2 * comps);
+            }
+         }
+         break;
+      case GL_INT:
+         {
+            GLint *dst = (GLint *) destination;
+            PACK_MACRO(GLint, FLOAT_TO_INT);
+            if (packing->SwapBytes) {
+               _mesa_swap4((GLuint *) dst, 2 * comps);
+            }
+         }
+         break;
+      case GL_FLOAT:
+         {
+            GLfloat *dst = (GLfloat *) destination;
+            PACK_MACRO(GLfloat, (GLfloat));
+            if (packing->SwapBytes) {
+               _mesa_swap4((GLuint *) dst, 2 * comps);
+            }
+         }
+         break;
+      default:
+         gl_problem(ctx, "Bad type in pack_minmax");
+   }
+
+#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 */
+   }
+}
+
+
+void
+_mesa_GetMinmax(GLenum target, GLboolean reset, GLenum format, GLenum type, GLvoid *values)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetMinmax");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glGetMinmax");
+      return;
+   }
+
+   if (target != GL_MINMAX) {
+      gl_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_RGBA &&
+       format != GL_ABGR_EXT &&
+       format != GL_LUMINANCE &&
+       format != GL_LUMINANCE_ALPHA) {
+      gl_error(ctx, GL_INVALID_ENUM, "glGetMinmax(format)");
+      return;
+   }
+
+   if (type != GL_UNSIGNED_BYTE &&
+       type != GL_BYTE &&
+       type != GL_UNSIGNED_SHORT &&
+       type != GL_SHORT &&
+       type != GL_UNSIGNED_INT &&
+       type != GL_INT &&
+       type != GL_FLOAT) {
+      gl_error(ctx, GL_INVALID_ENUM, "glGetMinmax(type)");
+      return;
+   }
+
+   if (!values)
+      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);
+      pack_minmax(ctx, (CONST GLfloat (*)[4]) minmax,
+                  format, type, values, &ctx->Pack);
+   }
+
+   if (reset) {
+      _mesa_ResetMinmax(GL_MINMAX);
+   }
+}
+
+
+void
+_mesa_GetHistogram(GLenum target, GLboolean reset, GLenum format, GLenum type, GLvoid *values)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetHistogram");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glGetHistogram");
+      return;
+   }
+
+   if (target != GL_HISTOGRAM) {
+      gl_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_RGBA &&
+       format != GL_ABGR_EXT &&
+       format != GL_LUMINANCE &&
+       format != GL_LUMINANCE_ALPHA) {
+      gl_error(ctx, GL_INVALID_ENUM, "glGetHistogram(format)");
+      return;
+   }
+
+   if (type != GL_UNSIGNED_BYTE &&
+       type != GL_BYTE &&
+       type != GL_UNSIGNED_SHORT &&
+       type != GL_SHORT &&
+       type != GL_UNSIGNED_INT &&
+       type != GL_INT &&
+       type != GL_FLOAT) {
+      gl_error(ctx, GL_INVALID_ENUM, "glGetHistogram(type)");
+      return;
+   }
+
+   if (!values)
+      return;
+
+   pack_histogram(ctx, ctx->Histogram.Width,
+                  (CONST GLuint (*)[4]) ctx->Histogram.Count,
+                  format, type, values, &ctx->Pack);
+
+   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
+_mesa_GetHistogramParameterfv(GLenum target, GLenum pname, GLfloat *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetHistogramParameterfv");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glGetHistogramParameterfv");
+      return;
+   }
+
+   if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
+      gl_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:
+         gl_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameterfv(pname)");
+   }
+}
+
+
+void
+_mesa_GetHistogramParameteriv(GLenum target, GLenum pname, GLint *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetHistogramParameteriv");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glGetHistogramParameteriv");
+      return;
+   }
+
+   if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
+      gl_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:
+         gl_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameteriv(pname)");
+   }
+}
+
+
+void
+_mesa_GetMinmaxParameterfv(GLenum target, GLenum pname, GLfloat *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetMinmaxParameterfv");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glGetMinmaxParameterfv");
+      return;
+   }
+   if (target != GL_MINMAX) {
+      gl_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 {
+      gl_error(ctx, GL_INVALID_ENUM, "glGetMinMaxParameterfv(pname)");
+   }
+}
+
+
+void
+_mesa_GetMinmaxParameteriv(GLenum target, GLenum pname, GLint *params)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetMinmaxParameteriv");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glGetMinmaxParameteriv");
+      return;
+   }
+   if (target != GL_MINMAX) {
+      gl_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 {
+      gl_error(ctx, GL_INVALID_ENUM, "glGetMinMaxParameteriv(pname)");
+   }
+}
+
+
+void
+_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, "glHistogram");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glHistogram");
+      return;
+   }
+
+   if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
+      gl_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)
+            gl_error(ctx, GL_INVALID_VALUE, "glHistogram(width)");
+         else
+            gl_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 {
+         gl_error(ctx, GL_INVALID_VALUE, "glHistogram(width)");
+         return;
+      }
+   }
+
+   if (base_histogram_format(internalFormat) < 0) {
+      if (target == GL_PROXY_HISTOGRAM) {
+         error = GL_TRUE;
+      }
+      else {
+         gl_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       = 0xffffffff;
+      ctx->Histogram.GreenSize     = 0xffffffff;
+      ctx->Histogram.BlueSize      = 0xffffffff;
+      ctx->Histogram.AlphaSize     = 0xffffffff;
+      ctx->Histogram.LuminanceSize = 0xffffffff;
+   }
+   
+   ctx->NewState |= _NEW_IMAGING;
+}
+
+
+void
+_mesa_Minmax(GLenum target, GLenum internalFormat, GLboolean sink)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glMinmax");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glMinmax");
+      return;
+   }
+
+   if (target != GL_MINMAX) {
+      gl_error(ctx, GL_INVALID_ENUM, "glMinMax(target)");
+      return;
+   }
+
+   if (base_histogram_format(internalFormat) < 0) {
+      gl_error(ctx, GL_INVALID_ENUM, "glMinMax(internalFormat)");
+      return;
+   }
+
+   ctx->MinMax.Sink = sink;
+   ctx->NewState |= _NEW_IMAGING;
+}
+
+
+void
+_mesa_ResetHistogram(GLenum target)
+{
+   GLuint i;
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glResetHistogram");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glResetHistogram");
+      return;
+   }
+
+   if (target != GL_HISTOGRAM) {
+      gl_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_IMAGING;
+}
+
+
+void
+_mesa_ResetMinmax(GLenum target)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glResetMinmax");
+
+   if (!ctx->Extensions.EXT_histogram) {
+      gl_error(ctx, GL_INVALID_OPERATION, "glResetMinmax");
+      return;
+   }
+
+   if (target != GL_MINMAX) {
+      gl_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_IMAGING;
+}