Remove unused mini and mesa glu subdirectories

1 files changed, 0 insertions, 767 deletions

diff --git a/src/glu/mini/mipmap.c b/src/glu/mini/mipmap.c
deleted file mode 100644
index 1cf739a13e3..00000000000
--- a/src/glu/mini/mipmap.c
+++ /dev/null
@@ -1,767 +0,0 @@
-
-/*
- * Mesa 3-D graphics library
- * Version:  3.4
- * Copyright (C) 1995-2000  Brian Paul
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
-#ifdef PC_HEADER
-#include "all.h"
-#else
-#include <assert.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include "gluP.h"
-#endif
-
-
-/*
- * Compute ceiling of integer quotient of A divided by B:
- */
-#define CEILING( A, B )  ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
-
-
-
-#ifdef EPSILON
-#undef EPSILON
-#endif
-#define EPSILON 0.001
-
-
-/* To work around optimizer bug in MSVC4.1 */
-#if defined(__WIN32__) && !defined(OPENSTEP)
-void
-dummy(GLuint j, GLuint k)
-{
-}
-#else
-#define dummy(J, K)
-#endif
-
-
-GLint GLAPIENTRY
-gluScaleImage(GLenum format,
-	      GLsizei widthin, GLsizei heightin,
-	      GLenum typein, const void *datain,
-	      GLsizei widthout, GLsizei heightout,
-	      GLenum typeout, void *dataout)
-{
-   GLint components, i, j, k;
-   GLfloat *tempin, *tempout, f;
-   GLfloat sx, sy;
-   GLint unpackrowlength, unpackalignment, unpackskiprows, unpackskippixels;
-   GLint packrowlength, packalignment, packskiprows, packskippixels;
-   GLint sizein, sizeout;
-   GLint rowstride, rowlen;
-
-
-   /* Determine number of components per pixel */
-   switch (format) {
-   case GL_COLOR_INDEX:
-   case GL_STENCIL_INDEX:
-   case GL_DEPTH_COMPONENT:
-   case GL_RED:
-   case GL_GREEN:
-   case GL_BLUE:
-   case GL_ALPHA:
-   case GL_LUMINANCE:
-      components = 1;
-      break;
-   case GL_LUMINANCE_ALPHA:
-      components = 2;
-      break;
-   case GL_RGB:
-   case GL_BGR:
-      components = 3;
-      break;
-   case GL_RGBA:
-   case GL_BGRA:
-#ifdef GL_EXT_abgr
-   case GL_ABGR_EXT:
-#endif
-      components = 4;
-      break;
-   default:
-      return GLU_INVALID_ENUM;
-   }
-
-   /* Determine bytes per input datum */
-   switch (typein) {
-   case GL_UNSIGNED_BYTE:
-      sizein = sizeof(GLubyte);
-      break;
-   case GL_BYTE:
-      sizein = sizeof(GLbyte);
-      break;
-   case GL_UNSIGNED_SHORT:
-      sizein = sizeof(GLushort);
-      break;
-   case GL_SHORT:
-      sizein = sizeof(GLshort);
-      break;
-   case GL_UNSIGNED_INT:
-      sizein = sizeof(GLuint);
-      break;
-   case GL_INT:
-      sizein = sizeof(GLint);
-      break;
-   case GL_FLOAT:
-      sizein = sizeof(GLfloat);
-      break;
-   case GL_BITMAP:
-      /* not implemented yet */
-   default:
-      return GL_INVALID_ENUM;
-   }
-
-   /* Determine bytes per output datum */
-   switch (typeout) {
-   case GL_UNSIGNED_BYTE:
-      sizeout = sizeof(GLubyte);
-      break;
-   case GL_BYTE:
-      sizeout = sizeof(GLbyte);
-      break;
-   case GL_UNSIGNED_SHORT:
-      sizeout = sizeof(GLushort);
-      break;
-   case GL_SHORT:
-      sizeout = sizeof(GLshort);
-      break;
-   case GL_UNSIGNED_INT:
-      sizeout = sizeof(GLuint);
-      break;
-   case GL_INT:
-      sizeout = sizeof(GLint);
-      break;
-   case GL_FLOAT:
-      sizeout = sizeof(GLfloat);
-      break;
-   case GL_BITMAP:
-      /* not implemented yet */
-   default:
-      return GL_INVALID_ENUM;
-   }
-
-   /* Get glPixelStore state */
-   glGetFloatv(GL_UNPACK_ROW_LENGTH, &f); unpackrowlength = (int)f;
-   glGetFloatv(GL_UNPACK_ALIGNMENT, &f); unpackalignment = (int)f;
-   glGetFloatv(GL_UNPACK_SKIP_ROWS, &f); unpackskiprows = (int)f;
-   glGetFloatv(GL_UNPACK_SKIP_PIXELS, &f); unpackskippixels = (int)f;
-   glGetFloatv(GL_PACK_ROW_LENGTH, &f); packrowlength = (int)f;
-   glGetFloatv(GL_PACK_ALIGNMENT, &f); packalignment = (int)f;
-   glGetFloatv(GL_PACK_SKIP_ROWS, &f); packskiprows = (int)f;
-   glGetFloatv(GL_PACK_SKIP_PIXELS, &f); packskippixels = (int)f;
-
-   /* Allocate storage for intermediate images */
-   tempin = (GLfloat *) malloc(widthin * heightin
-			       * components * sizeof(GLfloat));
-   if (!tempin) {
-      return GLU_OUT_OF_MEMORY;
-   }
-   tempout = (GLfloat *) malloc(widthout * heightout
-				* components * sizeof(GLfloat));
-   if (!tempout) {
-      free(tempin);
-      return GLU_OUT_OF_MEMORY;
-   }
-
-
-   /*
-    * Unpack the pixel data and convert to floating point
-    */
-
-   if (unpackrowlength > 0) {
-      rowlen = unpackrowlength;
-   }
-   else {
-      rowlen = widthin;
-   }
-   if (sizein >= unpackalignment) {
-      rowstride = components * rowlen;
-   }
-   else {
-      rowstride = unpackalignment / sizein
-	 * CEILING(components * rowlen * sizein, unpackalignment);
-   }
-
-   switch (typein) {
-   case GL_UNSIGNED_BYTE:
-      k = 0;
-      for (i = 0; i < heightin; i++) {
-	 GLubyte *ubptr = (GLubyte *) datain
-	    + i * rowstride
-	    + unpackskiprows * rowstride + unpackskippixels * components;
-	 for (j = 0; j < widthin * components; j++) {
-	    dummy(j, k);
-	    tempin[k++] = (GLfloat) * ubptr++;
-	 }
-      }
-      break;
-   case GL_BYTE:
-      k = 0;
-      for (i = 0; i < heightin; i++) {
-	 GLbyte *bptr = (GLbyte *) datain
-	    + i * rowstride
-	    + unpackskiprows * rowstride + unpackskippixels * components;
-	 for (j = 0; j < widthin * components; j++) {
-	    dummy(j, k);
-	    tempin[k++] = (GLfloat) * bptr++;
-	 }
-      }
-      break;
-   case GL_UNSIGNED_SHORT:
-      k = 0;
-      for (i = 0; i < heightin; i++) {
-	 GLushort *usptr = (GLushort *) datain
-	    + i * rowstride
-	    + unpackskiprows * rowstride + unpackskippixels * components;
-	 for (j = 0; j < widthin * components; j++) {
-	    dummy(j, k);
-	    tempin[k++] = (GLfloat) * usptr++;
-	 }
-      }
-      break;
-   case GL_SHORT:
-      k = 0;
-      for (i = 0; i < heightin; i++) {
-	 GLshort *sptr = (GLshort *) datain
-	    + i * rowstride
-	    + unpackskiprows * rowstride + unpackskippixels * components;
-	 for (j = 0; j < widthin * components; j++) {
-	    dummy(j, k);
-	    tempin[k++] = (GLfloat) * sptr++;
-	 }
-      }
-      break;
-   case GL_UNSIGNED_INT:
-      k = 0;
-      for (i = 0; i < heightin; i++) {
-	 GLuint *uiptr = (GLuint *) datain
-	    + i * rowstride
-	    + unpackskiprows * rowstride + unpackskippixels * components;
-	 for (j = 0; j < widthin * components; j++) {
-	    dummy(j, k);
-	    tempin[k++] = (GLfloat) * uiptr++;
-	 }
-      }
-      break;
-   case GL_INT:
-      k = 0;
-      for (i = 0; i < heightin; i++) {
-	 GLint *iptr = (GLint *) datain
-	    + i * rowstride
-	    + unpackskiprows * rowstride + unpackskippixels * components;
-	 for (j = 0; j < widthin * components; j++) {
-	    dummy(j, k);
-	    tempin[k++] = (GLfloat) * iptr++;
-	 }
-      }
-      break;
-   case GL_FLOAT:
-      k = 0;
-      for (i = 0; i < heightin; i++) {
-	 GLfloat *fptr = (GLfloat *) datain
-	    + i * rowstride
-	    + unpackskiprows * rowstride + unpackskippixels * components;
-	 for (j = 0; j < widthin * components; j++) {
-	    dummy(j, k);
-	    tempin[k++] = *fptr++;
-	 }
-      }
-      break;
-   default:
-      {
-         free(tempin);
-         free(tempout);
-         return GLU_INVALID_ENUM;
-      }
-   }
-
-
-   /*
-    * Scale the image!
-    */
-
-   if (widthout > 1)
-      sx = (GLfloat) (widthin - 1) / (GLfloat) (widthout - 1);
-   else
-      sx = (GLfloat) (widthin - 1);
-   if (heightout > 1)
-      sy = (GLfloat) (heightin - 1) / (GLfloat) (heightout - 1);
-   else
-      sy = (GLfloat) (heightin - 1);
-
-/*#define POINT_SAMPLE*/
-#ifdef POINT_SAMPLE
-   for (i = 0; i < heightout; i++) {
-      GLint ii = i * sy;
-      for (j = 0; j < widthout; j++) {
-	 GLint jj = j * sx;
-
-	 GLfloat *src = tempin + (ii * widthin + jj) * components;
-	 GLfloat *dst = tempout + (i * widthout + j) * components;
-
-	 for (k = 0; k < components; k++) {
-	    *dst++ = *src++;
-	 }
-      }
-   }
-#else
-   if (sx < 1.0 && sy < 1.0) {
-      /* magnify both width and height:  use weighted sample of 4 pixels */
-      GLint i0, i1, j0, j1;
-      GLfloat alpha, beta;
-      GLfloat *src00, *src01, *src10, *src11;
-      GLfloat s1, s2;
-      GLfloat *dst;
-
-      for (i = 0; i < heightout; i++) {
-	 i0 = i * sy;
-	 i1 = i0 + 1;
-	 if (i1 >= heightin)
-	    i1 = heightin - 1;
-/*	 i1 = (i+1) * sy - EPSILON;*/
-	 alpha = i * sy - i0;
-	 for (j = 0; j < widthout; j++) {
-	    j0 = j * sx;
-	    j1 = j0 + 1;
-	    if (j1 >= widthin)
-	       j1 = widthin - 1;
-/*	    j1 = (j+1) * sx - EPSILON; */
-	    beta = j * sx - j0;
-
-	    /* compute weighted average of pixels in rect (i0,j0)-(i1,j1) */
-	    src00 = tempin + (i0 * widthin + j0) * components;
-	    src01 = tempin + (i0 * widthin + j1) * components;
-	    src10 = tempin + (i1 * widthin + j0) * components;
-	    src11 = tempin + (i1 * widthin + j1) * components;
-
-	    dst = tempout + (i * widthout + j) * components;
-
-	    for (k = 0; k < components; k++) {
-	       s1 = *src00++ * (1.0 - beta) + *src01++ * beta;
-	       s2 = *src10++ * (1.0 - beta) + *src11++ * beta;
-	       *dst++ = s1 * (1.0 - alpha) + s2 * alpha;
-	    }
-	 }
-      }
-   }
-   else {
-      /* shrink width and/or height:  use an unweighted box filter */
-      GLint i0, i1;
-      GLint j0, j1;
-      GLint ii, jj;
-      GLfloat sum, *dst;
-
-      for (i = 0; i < heightout; i++) {
-	 i0 = i * sy;
-	 i1 = i0 + 1;
-	 if (i1 >= heightin)
-	    i1 = heightin - 1;
-/*	 i1 = (i+1) * sy - EPSILON; */
-	 for (j = 0; j < widthout; j++) {
-	    j0 = j * sx;
-	    j1 = j0 + 1;
-	    if (j1 >= widthin)
-	       j1 = widthin - 1;
-/*	    j1 = (j+1) * sx - EPSILON; */
-
-	    dst = tempout + (i * widthout + j) * components;
-
-	    /* compute average of pixels in the rectangle (i0,j0)-(i1,j1) */
-	    for (k = 0; k < components; k++) {
-	       sum = 0.0;
-	       for (ii = i0; ii <= i1; ii++) {
-		  for (jj = j0; jj <= j1; jj++) {
-		     sum += *(tempin + (ii * widthin + jj) * components + k);
-		  }
-	       }
-	       sum /= (j1 - j0 + 1) * (i1 - i0 + 1);
-	       *dst++ = sum;
-	    }
-	 }
-      }
-   }
-#endif
-
-
-   /*
-    * Return output image
-    */
-
-   if (packrowlength > 0) {
-      rowlen = packrowlength;
-   }
-   else {
-      rowlen = widthout;
-   }
-   if (sizeout >= packalignment) {
-      rowstride = components * rowlen;
-   }
-   else {
-      rowstride = packalignment / sizeout
-	 * CEILING(components * rowlen * sizeout, packalignment);
-   }
-
-   switch (typeout) {
-   case GL_UNSIGNED_BYTE:
-      k = 0;
-      for (i = 0; i < heightout; i++) {
-	 GLubyte *ubptr = (GLubyte *) dataout
-	    + i * rowstride
-	    + packskiprows * rowstride + packskippixels * components;
-	 for (j = 0; j < widthout * components; j++) {
-	    dummy(j, k + i);
-	    *ubptr++ = (GLubyte) tempout[k++];
-	 }
-      }
-      break;
-   case GL_BYTE:
-      k = 0;
-      for (i = 0; i < heightout; i++) {
-	 GLbyte *bptr = (GLbyte *) dataout
-	    + i * rowstride
-	    + packskiprows * rowstride + packskippixels * components;
-	 for (j = 0; j < widthout * components; j++) {
-	    dummy(j, k + i);
-	    *bptr++ = (GLbyte) tempout[k++];
-	 }
-      }
-      break;
-   case GL_UNSIGNED_SHORT:
-      k = 0;
-      for (i = 0; i < heightout; i++) {
-	 GLushort *usptr = (GLushort *) dataout
-	    + i * rowstride
-	    + packskiprows * rowstride + packskippixels * components;
-	 for (j = 0; j < widthout * components; j++) {
-	    dummy(j, k + i);
-	    *usptr++ = (GLushort) tempout[k++];
-	 }
-      }
-      break;
-   case GL_SHORT:
-      k = 0;
-      for (i = 0; i < heightout; i++) {
-	 GLshort *sptr = (GLshort *) dataout
-	    + i * rowstride
-	    + packskiprows * rowstride + packskippixels * components;
-	 for (j = 0; j < widthout * components; j++) {
-	    dummy(j, k + i);
-	    *sptr++ = (GLshort) tempout[k++];
-	 }
-      }
-      break;
-   case GL_UNSIGNED_INT:
-      k = 0;
-      for (i = 0; i < heightout; i++) {
-	 GLuint *uiptr = (GLuint *) dataout
-	    + i * rowstride
-	    + packskiprows * rowstride + packskippixels * components;
-	 for (j = 0; j < widthout * components; j++) {
-	    dummy(j, k + i);
-	    *uiptr++ = (GLuint) tempout[k++];
-	 }
-      }
-      break;
-   case GL_INT:
-      k = 0;
-      for (i = 0; i < heightout; i++) {
-	 GLint *iptr = (GLint *) dataout
-	    + i * rowstride
-	    + packskiprows * rowstride + packskippixels * components;
-	 for (j = 0; j < widthout * components; j++) {
-	    dummy(j, k + i);
-	    *iptr++ = (GLint) tempout[k++];
-	 }
-      }
-      break;
-   case GL_FLOAT:
-      k = 0;
-      for (i = 0; i < heightout; i++) {
-	 GLfloat *fptr = (GLfloat *) dataout
-	    + i * rowstride
-	    + packskiprows * rowstride + packskippixels * components;
-	 for (j = 0; j < widthout * components; j++) {
-	    dummy(j, k + i);
-	    *fptr++ = tempout[k++];
-	 }
-      }
-      break;
-   default:
-      return GLU_INVALID_ENUM;
-   }
-
-
-   /* free temporary image storage */
-   free(tempin);
-   free(tempout);
-
-   return 0;
-}
-
-
-
-/*
- * Return the largest k such that 2^k <= n.
- */
-static GLint
-ilog2(GLint n)
-{
-   GLint k;
-
-   if (n <= 0)
-      return 0;
-   for (k = 0; n >>= 1; k++);
-   return k;
-}
-
-
-
-/*
- * Find the value nearest to n which is also a power of two.
- */
-static GLint
-round2(GLint n)
-{
-   GLint m;
-
-   for (m = 1; m < n; m *= 2);
-
-   /* m>=n */
-   if (m - n <= n - m / 2) {
-      return m;
-   }
-   else {
-      return m / 2;
-   }
-}
-
-
-/*
- * Given an pixel format and data type, return the number of bytes to
- * store one pixel.
- */
-static GLint
-bytes_per_pixel(GLenum format, GLenum type)
-{
-   GLint n, m;
-
-   switch (format) {
-   case GL_COLOR_INDEX:
-   case GL_STENCIL_INDEX:
-   case GL_DEPTH_COMPONENT:
-   case GL_RED:
-   case GL_GREEN:
-   case GL_BLUE:
-   case GL_ALPHA:
-   case GL_LUMINANCE:
-      n = 1;
-      break;
-   case GL_LUMINANCE_ALPHA:
-      n = 2;
-      break;
-   case GL_RGB:
-   case GL_BGR:
-      n = 3;
-      break;
-   case GL_RGBA:
-   case GL_BGRA:
-#ifdef GL_EXT_abgr
-   case GL_ABGR_EXT:
-#endif
-      n = 4;
-      break;
-   default:
-      n = 0;
-   }
-
-   switch (type) {
-   case GL_UNSIGNED_BYTE:
-      m = sizeof(GLubyte);
-      break;
-   case GL_BYTE:
-      m = sizeof(GLbyte);
-      break;
-   case GL_BITMAP:
-      m = 1;
-      break;
-   case GL_UNSIGNED_SHORT:
-      m = sizeof(GLushort);
-      break;
-   case GL_SHORT:
-      m = sizeof(GLshort);
-      break;
-   case GL_UNSIGNED_INT:
-      m = sizeof(GLuint);
-      break;
-   case GL_INT:
-      m = sizeof(GLint);
-      break;
-   case GL_FLOAT:
-      m = sizeof(GLfloat);
-      break;
-   default:
-      m = 0;
-   }
-
-   return n * m;
-}
-
-
-
-/*
- * WARNING: This function isn't finished and has never been tested!!!!
- */
-GLint GLAPIENTRY
-gluBuild1DMipmaps(GLenum target, GLint components,
-		  GLsizei width, GLenum format, GLenum type, const void *data)
-{
-   return 0;
-}
-
-
-
-GLint GLAPIENTRY
-gluBuild2DMipmaps(GLenum target, GLint components,
-		  GLsizei width, GLsizei height, GLenum format,
-		  GLenum type, const void *data)
-{
-   GLint w, h;
-   GLint maxsize;
-   void *image, *newimage;
-   GLint neww, newh, level, bpp;
-   int error;
-   GLboolean done;
-   GLint retval = 0;
-   GLint unpackrowlength, unpackalignment, unpackskiprows, unpackskippixels;
-   GLint packrowlength, packalignment, packskiprows, packskippixels;
-   GLfloat f;
-
-   if (width < 1 || height < 1)
-      return GLU_INVALID_VALUE;
-
-   glGetFloatv(GL_MAX_TEXTURE_SIZE, &f); maxsize = (int)f;
-
-   w = round2(width);
-   if (w > maxsize) {
-      w = maxsize;
-   }
-   h = round2(height);
-   if (h > maxsize) {
-      h = maxsize;
-   }
-
-   bpp = bytes_per_pixel(format, type);
-   if (bpp == 0) {
-      /* probably a bad format or type enum */
-      return GLU_INVALID_ENUM;
-   }
-
-   /* Get current glPixelStore values */
-   glGetFloatv(GL_UNPACK_ROW_LENGTH, &f); unpackrowlength = (int)f;
-   glGetFloatv(GL_UNPACK_ALIGNMENT, &f); unpackalignment = (int)f;
-   glGetFloatv(GL_UNPACK_SKIP_ROWS, &f); unpackskiprows = (int)f;
-   glGetFloatv(GL_UNPACK_SKIP_PIXELS, &f); unpackskippixels = (int)f;
-   glGetFloatv(GL_PACK_ROW_LENGTH, &f); packrowlength = (int)f;
-   glGetFloatv(GL_PACK_ALIGNMENT, &f); packalignment = (int)f;
-   glGetFloatv(GL_PACK_SKIP_ROWS, &f); packskiprows = (int)f;
-   glGetFloatv(GL_PACK_SKIP_PIXELS, &f); packskippixels = (int)f;
-
-   /* set pixel packing */
-   glPixelStorei(GL_PACK_ROW_LENGTH, 0);
-   glPixelStorei(GL_PACK_ALIGNMENT, 1);
-   glPixelStorei(GL_PACK_SKIP_ROWS, 0);
-   glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
-
-   done = GL_FALSE;
-
-   if (w != width || h != height) {
-      /* must rescale image to get "top" mipmap texture image */
-      image = malloc((w + 4) * h * bpp);
-      if (!image) {
-	 return GLU_OUT_OF_MEMORY;
-      }
-      error = gluScaleImage(format, width, height, type, data,
-			    w, h, type, image);
-      if (error) {
-	 retval = error;
-	 done = GL_TRUE;
-      }
-   }
-   else {
-      image = (void *) data;
-   }
-
-   level = 0;
-   while (!done) {
-      if (image != data) {
-	 /* set pixel unpacking */
-	 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
-	 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-	 glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
-	 glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
-      }
-
-      glTexImage2D(target, level, components, w, h, 0, format, type, image);
-
-      if (w == 1 && h == 1)
-	 break;
-
-      neww = (w < 2) ? 1 : w / 2;
-      newh = (h < 2) ? 1 : h / 2;
-      newimage = malloc((neww + 4) * newh * bpp);
-      if (!newimage) {
-	 return GLU_OUT_OF_MEMORY;
-      }
-
-      error = gluScaleImage(format, w, h, type, image,
-			    neww, newh, type, newimage);
-      if (error) {
-	 retval = error;
-	 done = GL_TRUE;
-      }
-
-      if (image != data) {
-	 free(image);
-      }
-      image = newimage;
-
-      w = neww;
-      h = newh;
-      level++;
-   }
-
-   if (image != data) {
-      free(image);
-   }
-
-   /* Restore original glPixelStore state */
-   glPixelStorei(GL_UNPACK_ROW_LENGTH, unpackrowlength);
-   glPixelStorei(GL_UNPACK_ALIGNMENT, unpackalignment);
-   glPixelStorei(GL_UNPACK_SKIP_ROWS, unpackskiprows);
-   glPixelStorei(GL_UNPACK_SKIP_PIXELS, unpackskippixels);
-   glPixelStorei(GL_PACK_ROW_LENGTH, packrowlength);
-   glPixelStorei(GL_PACK_ALIGNMENT, packalignment);
-   glPixelStorei(GL_PACK_SKIP_ROWS, packskiprows);
-   glPixelStorei(GL_PACK_SKIP_PIXELS, packskippixels);
-
-   return retval;
-}