From afb833d4e89c312460a4ab9ed6a7a8ca4ebbfe1c Mon Sep 17 00:00:00 2001
From: jtg <jtg>
Date: Thu, 19 Aug 1999 00:55:39 +0000
Subject: Initial revision

---
 src/mesa/main/drawpix.c | 946 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 946 insertions(+)
 create mode 100644 src/mesa/main/drawpix.c

(limited to 'src/mesa/main/drawpix.c')

diff --git a/src/mesa/main/drawpix.c b/src/mesa/main/drawpix.c
new file mode 100644
index 0000000000..a78f345a81
--- /dev/null
+++ b/src/mesa/main/drawpix.c
@@ -0,0 +1,946 @@
+/* $Id: drawpix.c,v 1.1 1999/08/19 00:55:41 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.1
+ * 
+ * Copyright (C) 1999  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 <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include "context.h"
+#include "drawpix.h"
+#include "feedback.h"
+#include "image.h"
+#include "macros.h"
+#include "mmath.h"
+#include "pixel.h"
+#include "span.h"
+#include "stencil.h"
+#include "types.h"
+#include "zoom.h"
+#ifdef XFree86Server
+#include "GL/xf86glx.h"
+#endif
+#endif
+
+
+
+/* TODO:  apply texture mapping to fragments */
+
+
+/*
+ * Try to do a fast glDrawPixels.  Conditions include:
+ *   not using a display list
+ *   simple pixel unpacking
+ *   no raster ops
+ *   etc....
+ * Return:  GL_TRUE if success, GL_FALSE if slow path must be used instead
+ */
+GLboolean gl_direct_DrawPixels( GLcontext *ctx,
+                                const struct gl_pixelstore_attrib *unpack,
+                                GLsizei width, GLsizei height,
+                                GLenum format, GLenum type,
+                                const GLvoid *pixels )
+{
+   GLubyte rgb[MAX_WIDTH][3];
+   GLubyte rgba[MAX_WIDTH][4];
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glDrawPixels", 
+						  GL_FALSE);
+
+
+   if (!ctx->Current.RasterPosValid) {
+      /* no-op */
+      return GL_TRUE;
+   }
+
+   if (ctx->NewState) {
+      gl_update_state(ctx);
+   }
+
+   /* see if device driver can do the drawpix */
+   if (ctx->Driver.DrawPixels) {
+      GLint x = (GLint) (ctx->Current.RasterPos[0] + 0.5F);
+      GLint y = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
+      if ((*ctx->Driver.DrawPixels)(ctx, x, y, width, height, format, type,
+                                    unpack, pixels))
+         return GL_TRUE;
+   }
+
+   if ((ctx->RasterMask&(~(SCISSOR_BIT|WINCLIP_BIT)))==0
+       && ctx->Pixel.RedBias==0.0 && ctx->Pixel.RedScale==1.0
+       && ctx->Pixel.GreenBias==0.0 && ctx->Pixel.GreenScale==1.0
+       && ctx->Pixel.BlueBias==0.0 && ctx->Pixel.BlueScale==1.0
+       && ctx->Pixel.AlphaBias==0.0 && ctx->Pixel.AlphaScale==1.0
+       && ctx->Pixel.IndexShift==0 && ctx->Pixel.IndexOffset==0
+       && ctx->Pixel.MapColorFlag==0
+       && unpack->Alignment==1
+       && !unpack->SwapBytes
+       && !unpack->LsbFirst) {
+
+      GLint destX = (GLint) (ctx->Current.RasterPos[0] + 0.5F);
+      GLint destY = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
+      GLint drawWidth = width;           /* actual width drawn */
+      GLint drawHeight = height;         /* actual height drawn */
+      GLint skipPixels = unpack->SkipPixels;
+      GLint skipRows = unpack->SkipRows;
+      GLint rowLength;
+      GLdepth zSpan[MAX_WIDTH];  /* only used when zooming */
+      GLint zoomY0;
+
+      if (unpack->RowLength > 0)
+         rowLength = unpack->RowLength;
+      else
+         rowLength = width;
+
+      /* If we're not using pixel zoom then do all clipping calculations
+       * now.  Otherwise, we'll let the gl_write_zoomed_*_span() functions
+       * handle the clipping.
+       */
+      if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
+         /* horizontal clipping */
+         if (destX < ctx->Buffer->Xmin) {
+            skipPixels += (ctx->Buffer->Xmin - destX);
+            drawWidth  -= (ctx->Buffer->Xmin - destX);
+            destX = ctx->Buffer->Xmin;
+         }
+         if (destX + drawWidth > ctx->Buffer->Xmax)
+            drawWidth -= (destX + drawWidth - ctx->Buffer->Xmax - 1);
+         if (drawWidth <= 0)
+            return GL_TRUE;
+
+         /* vertical clipping */
+         if (destY < ctx->Buffer->Ymin) {
+            skipRows   += (ctx->Buffer->Ymin - destY);
+            drawHeight -= (ctx->Buffer->Ymin - destY);
+            destY = ctx->Buffer->Ymin;
+         }
+         if (destY + drawHeight > ctx->Buffer->Ymax)
+            drawHeight -= (destY + drawHeight - ctx->Buffer->Ymax - 1);
+         if (drawHeight <= 0)
+            return GL_TRUE;
+      }
+      else {
+         /* setup array of fragment Z value to pass to zoom function */
+         GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * DEPTH_SCALE);
+         GLint i;
+         assert(drawWidth < MAX_WIDTH);
+         for (i=0; i<drawWidth; i++)
+            zSpan[i] = z;
+
+         /* save Y value of first row */
+         zoomY0 = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
+      }
+
+
+      /*
+       * Ready to draw!
+       * The window region at (destX, destY) of size (drawWidth, drawHeight)
+       * will be written to.
+       * We'll take pixel data from buffer pointed to by "pixels" but we'll
+       * skip "skipRows" rows and skip "skipPixels" pixels/row.
+       */
+
+      if (format==GL_RGBA && type==GL_UNSIGNED_BYTE) {
+         if (ctx->Visual->RGBAflag) {
+            GLubyte *src = (GLubyte *) pixels
+               + (skipRows * rowLength + skipPixels) * 4;
+            if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
+               /* no zooming */
+               GLint row;
+               for (row=0; row<drawHeight; row++) {
+                  (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
+                                               (void *) src, NULL);
+                  src += rowLength * 4;
+                  destY++;
+               }
+            }
+            else {
+               /* with zooming */
+               GLint row;
+               for (row=0; row<drawHeight; row++) {
+                  gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
+                                            zSpan, (void *) src, zoomY0);
+                  src += rowLength * 4;
+                  destY++;
+               }
+            }
+         }
+         return GL_TRUE;
+      }
+      else if (format==GL_RGB && type==GL_UNSIGNED_BYTE) {
+         if (ctx->Visual->RGBAflag) {
+            GLubyte *src = (GLubyte *) pixels
+               + (skipRows * rowLength + skipPixels) * 3;
+            if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
+               GLint row;
+               for (row=0; row<drawHeight; row++) {
+                  (*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
+                                              (void *) src, NULL);
+                  src += rowLength * 3;
+                  destY++;
+               }
+            }
+            else {
+               /* with zooming */
+               GLint row;
+               for (row=0; row<drawHeight; row++) {
+                  gl_write_zoomed_rgb_span(ctx, drawWidth, destX, destY,
+                                           zSpan, (void *) src, zoomY0);
+                  src += rowLength * 3;
+                  destY++;
+               }
+            }
+         }
+         return GL_TRUE;
+      }
+      else if (format==GL_LUMINANCE && type==GL_UNSIGNED_BYTE) {
+         if (ctx->Visual->RGBAflag) {
+            GLubyte *src = (GLubyte *) pixels
+               + (skipRows * rowLength + skipPixels);
+            if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
+               /* no zooming */
+               GLint row;
+               assert(drawWidth < MAX_WIDTH);
+               for (row=0; row<drawHeight; row++) {
+                  GLint i;
+		  for (i=0;i<drawWidth;i++) {
+                     rgb[i][0] = src[i];
+                     rgb[i][1] = src[i];
+                     rgb[i][2] = src[i];
+		  }
+                  (*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
+                                              (void *) rgb, NULL);
+                  src += rowLength;
+                  destY++;
+               }
+            }
+            else {
+               /* with zooming */
+               GLint row;
+               assert(drawWidth < MAX_WIDTH);
+               for (row=0; row<drawHeight; row++) {
+                  GLint i;
+		  for (i=0;i<drawWidth;i++) {
+                     rgb[i][0] = src[i];
+                     rgb[i][1] = src[i];
+                     rgb[i][2] = src[i];
+		  }
+                  gl_write_zoomed_rgb_span(ctx, drawWidth, destX, destY,
+                                           zSpan, (void *) rgb, zoomY0);
+                  src += rowLength;
+                  destY++;
+               }
+            }
+         }
+         return GL_TRUE;
+      }
+      else if (format==GL_LUMINANCE_ALPHA && type==GL_UNSIGNED_BYTE) {
+         if (ctx->Visual->RGBAflag) {
+            GLubyte *src = (GLubyte *) pixels
+               + (skipRows * rowLength + skipPixels)*2;
+            if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
+               /* no zooming */
+               GLint row;
+               assert(drawWidth < MAX_WIDTH);
+               for (row=0; row<drawHeight; row++) {
+                  GLint i;
+                  GLubyte *ptr = src;
+		  for (i=0;i<drawWidth;i++) {
+                     rgba[i][0] = *ptr;
+                     rgba[i][1] = *ptr;
+                     rgba[i][2] = *ptr++;
+                     rgba[i][3] = *ptr++;
+		  }
+                  (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
+                                               (void *) rgba, NULL);
+                  src += rowLength*2;
+                  destY++;
+               }
+            }
+            else {
+               /* with zooming */
+               GLint row;
+               assert(drawWidth < MAX_WIDTH);
+               for (row=0; row<drawHeight; row++) {
+                  GLubyte *ptr = src;
+                  GLint i;
+		  for (i=0;i<drawWidth;i++) {
+                     rgba[i][0] = *ptr;
+                     rgba[i][1] = *ptr;
+                     rgba[i][2] = *ptr++;
+                     rgba[i][3] = *ptr++;
+		  }
+                  gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
+                                            zSpan, (void *) rgba, zoomY0);
+                  src += rowLength*2;
+                  destY++;
+               }
+            }
+         }
+         return GL_TRUE;
+      }
+      else if (format==GL_COLOR_INDEX && type==GL_UNSIGNED_BYTE) {
+         GLubyte *src = (GLubyte *) pixels + skipRows * rowLength + skipPixels;
+         if (ctx->Visual->RGBAflag) {
+            /* convert CI data to RGBA */
+            if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
+               /* no zooming */
+               GLint row;
+               for (row=0; row<drawHeight; row++) {
+                  assert(drawWidth < MAX_WIDTH);
+                  gl_map_ci8_to_rgba(ctx, drawWidth, src, rgba);
+                  (*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
+                                               (const GLubyte (*)[4])rgba, 
+					       NULL);
+                  src += rowLength;
+                  destY++;
+               }
+               return GL_TRUE;
+            }
+            else {
+               /* with zooming */
+               GLint row;
+               for (row=0; row<drawHeight; row++) {
+                  assert(drawWidth < MAX_WIDTH);
+                  gl_map_ci8_to_rgba(ctx, drawWidth, src, rgba);
+                  gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
+                                            zSpan, (void *) rgba, zoomY0);
+                  src += rowLength;
+                  destY++;
+               }
+               return GL_TRUE;
+            }
+         }
+         else {
+            /* write CI data to CI frame buffer */
+            GLint row;
+            if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
+               /* no zooming */
+               for (row=0; row<drawHeight; row++) {
+                  (*ctx->Driver.WriteCI8Span)(ctx, drawWidth, destX, destY,
+                                              src, NULL);
+                  src += rowLength;
+                  destY++;
+               }
+               return GL_TRUE;
+            }
+            else {
+               /* with zooming */
+               return GL_FALSE;
+            }
+         }
+      }
+      else {
+         /* can't handle this pixel format and/or data type here */
+         return GL_FALSE;
+      }
+   }
+   else {
+      /* can't do direct render, have to use slow path */
+      return GL_FALSE;
+   }
+}
+
+
+
+/*
+ * Do glDrawPixels of index pixels.
+ */
+static void draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
+                               const struct gl_image *image )
+{
+   GLint width, height, widthInBytes;
+   const GLint desty = y;
+   GLint i, j;
+   GLdepth zspan[MAX_WIDTH];
+   const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
+
+   assert(image);
+   assert(image->Format == GL_COLOR_INDEX);
+
+   width = image->Width;
+   height = image->Height;
+   if (image->Type == GL_BITMAP)
+      widthInBytes = (width + 7) / 8;
+   else
+      widthInBytes = width;
+
+   /* Fragment depth values */
+   if (ctx->Depth.Test) {
+      GLdepth zval = (GLdepth) (ctx->Current.RasterPos[2] * DEPTH_SCALE);
+      for (i=0;i<width;i++) {
+	 zspan[i] = zval;
+      }
+   }
+
+   /* process the image row by row */
+   for (i=0;i<height;i++,y++) {
+      GLuint ispan[MAX_WIDTH];
+
+      /* convert to uints */
+      switch (image->Type) {
+	 case GL_UNSIGNED_BYTE:
+	    {
+	       GLubyte *src = (GLubyte *) image->Data + i * width;
+	       for (j=0;j<width;j++) {
+		  ispan[j] = (GLuint) *src++;
+	       }
+	    }
+	    break;
+	 case GL_FLOAT:
+	    {
+	       GLfloat *src = (GLfloat *) image->Data + i * width;
+	       for (j=0;j<width;j++) {
+		  ispan[j] = (GLuint) (GLint) *src++;
+	       }
+	    }
+	    break;
+         case GL_BITMAP:
+            {
+	       GLubyte *src = (GLubyte *) image->Data + i * widthInBytes;
+	       for (j=0;j<width;j++) {
+		  ispan[j] = ( src[j >> 3] >> (7 - (j & 0x7)) ) & 1;
+	       }
+            }
+            break;
+	 default:
+	    gl_problem( ctx, "draw_index_pixels type" );
+            return;
+      }
+
+      /* apply shift and offset */
+      if (ctx->Pixel.IndexOffset || ctx->Pixel.IndexShift) {
+         gl_shift_and_offset_ci( ctx, width, ispan );
+      }
+
+      if (ctx->Visual->RGBAflag) {
+	 /* Convert index to RGBA and write to frame buffer */
+	 GLubyte rgba[MAX_WIDTH][4];
+         gl_map_ci_to_rgba( ctx, width, ispan, rgba );
+         if (zoom) {
+            gl_write_zoomed_rgba_span( ctx, width, x, y, zspan, 
+				       (const GLubyte (*)[4])rgba, desty );
+         }
+         else {
+            gl_write_rgba_span( ctx, width, x, y, zspan, rgba, GL_BITMAP );
+         }
+      }
+      else {
+	 /* optionally apply index map then write to frame buffer */
+	 if (ctx->Pixel.MapColorFlag) {
+            gl_map_ci(ctx, width, ispan);
+	 }
+         if (zoom) {
+            gl_write_zoomed_index_span( ctx, width, x, y, zspan, ispan, desty );
+         }
+         else {
+            gl_write_index_span( ctx, width, x, y, zspan, ispan, GL_BITMAP );
+         }
+      }
+   }
+
+}
+
+
+
+/*
+ * Do glDrawPixels of stencil image.  The image datatype may either
+ * be GLubyte or GLbitmap.
+ */
+static void draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
+                                 const struct gl_image *image )
+{
+   GLint widthInBytes, width, height;
+   const GLint desty = y;
+   GLint i;
+   const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
+
+   assert(image);
+   assert(image->Format == GL_STENCIL_INDEX);
+   assert(image->Type == GL_UNSIGNED_BYTE || image->Type == GL_BITMAP);
+
+   if (image->Type == GL_UNSIGNED_BYTE)
+      widthInBytes = image->Width;
+   else
+      widthInBytes = (image->Width + 7) / 8;
+   width = image->Width;
+   height = image->Height;
+
+   /* process the image row by row */
+   for (i=0;i<height;i++,y++) {
+      GLstencil *src = (GLstencil*)image->Data + i * widthInBytes;
+      GLstencil *stencilValues;
+      GLstencil stencilCopy[MAX_WIDTH];
+
+      if (image->Type == GL_BITMAP) {
+         /* convert bitmap data to GLubyte (0 or 1) data */
+         GLint j;
+         for (j = 0; j < width; j++) {
+            stencilCopy[j] = ( src[j >> 3] >> (7 - (j & 0x7)) ) & 1;
+         }
+         src = stencilCopy;
+      }
+
+      if (ctx->Pixel.IndexOffset || ctx->Pixel.IndexShift
+          || ctx->Pixel.MapStencilFlag) {
+
+         /* make copy of stencil values */
+         if (src != stencilCopy)
+            MEMCPY( stencilCopy, src, width * sizeof(GLstencil));
+
+         /* apply shift and offset */
+         if (ctx->Pixel.IndexOffset || ctx->Pixel.IndexShift) {
+            gl_shift_and_offset_stencil( ctx, width, stencilCopy );
+         }
+
+         /* mapping */
+         if (ctx->Pixel.MapStencilFlag) {
+            gl_map_stencil( ctx, width, stencilCopy );
+         }
+
+         stencilValues = stencilCopy;
+      }
+      else {
+         /* use stencil values in-place */
+         stencilValues = src;
+      }
+
+      /* write stencil values to stencil buffer */
+      if (zoom) {
+         gl_write_zoomed_stencil_span( ctx, (GLuint) width, x, y,
+                                       stencilValues, desty );
+      }
+      else {
+         gl_write_stencil_span( ctx, (GLuint) width, x, y, stencilValues );
+      }
+   }
+}
+
+
+
+/*
+ * Do a glDrawPixels of depth values.
+ */
+static void draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
+                               const struct gl_image *image )
+{
+   GLint width, height;
+   const GLint desty = y;
+   GLubyte rgba[MAX_WIDTH][4];
+   GLuint ispan[MAX_WIDTH];
+   const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
+   const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
+
+   assert(image);
+   assert(image->Format == GL_DEPTH_COMPONENT);
+
+   width = image->Width;
+   height = image->Height;
+
+   /* Color or index */
+   if (ctx->Visual->RGBAflag) {
+      GLint r = (GLint) (ctx->Current.RasterColor[0] * 255.0F);
+      GLint g = (GLint) (ctx->Current.RasterColor[1] * 255.0F);
+      GLint b = (GLint) (ctx->Current.RasterColor[2] * 255.0F);
+      GLint a = (GLint) (ctx->Current.RasterColor[3] * 255.0F);
+      GLint i;
+      for (i=0; i<width; i++) {
+         rgba[i][RCOMP] = r;
+         rgba[i][GCOMP] = g;
+         rgba[i][BCOMP] = b;
+         rgba[i][ACOMP] = a;
+      }
+   }
+   else {
+      GLint i;
+      for (i=0;i<width;i++) {
+	 ispan[i] = ctx->Current.RasterIndex;
+      }
+   }
+
+   if (image->Type==GL_UNSIGNED_SHORT && sizeof(GLdepth)==sizeof(GLushort)
+       && !bias_or_scale && !zoom && ctx->Visual->RGBAflag) {
+      /* Special case: directly write 16-bit depth values */
+      GLint j;
+      for (j=0;j<height;j++,y++) {
+         GLdepth *zptr = (GLdepth *) image->Data + j * width;
+         gl_write_rgba_span( ctx, width, x, y, zptr, rgba, GL_BITMAP );
+      }
+   }
+   else if (image->Type==GL_UNSIGNED_INT && sizeof(GLdepth)==sizeof(GLuint)
+       && !bias_or_scale && !zoom && ctx->Visual->RGBAflag) {
+      /* Special case: directly write 32-bit depth values */
+      GLint i, j;
+      /* Compute shift value to scale 32-bit uints down to depth values. */
+      GLuint shift = 0;
+      GLuint max = MAX_DEPTH;
+      while ((max&0x80000000)==0) {
+         max = max << 1;
+         shift++;
+      }
+      for (j=0;j<height;j++,y++) {
+         GLdepth zspan[MAX_WIDTH];
+         GLuint *zptr = (GLuint *) image->Data + j * width;
+         for (i=0;i<width;i++) {
+            zspan[i] = zptr[i] >> shift;
+         }
+         gl_write_rgba_span( ctx, width, x, y, zspan, rgba, GL_BITMAP );
+      }
+   }
+   else {
+      /* General case (slower) */
+      GLint i, j;
+
+      /* process image row by row */
+      for (i=0;i<height;i++,y++) {
+         GLfloat depth[MAX_WIDTH];
+         GLdepth zspan[MAX_WIDTH];
+
+         switch (image->Type) {
+            case GL_UNSIGNED_SHORT:
+               {
+                  GLushort *src = (GLushort *) image->Data + i * width;
+                  for (j=0;j<width;j++) {
+                     depth[j] = USHORT_TO_FLOAT( *src++ );
+                  }
+               }
+               break;
+            case GL_UNSIGNED_INT:
+               {
+                  GLuint *src = (GLuint *) image->Data + i * width;
+                  for (j=0;j<width;j++) {
+                     depth[j] = UINT_TO_FLOAT( *src++ );
+                  }
+               }
+               break;
+            case GL_FLOAT:
+               {
+                  GLfloat *src = (GLfloat *) image->Data + i * width;
+                  for (j=0;j<width;j++) {
+                     depth[j] = *src++;
+                  }
+               }
+               break;
+            default:
+               gl_problem(ctx, "Bad type in draw_depth_pixels");
+               return;
+         }
+
+         /* apply depth scale and bias */
+         if (ctx->Pixel.DepthScale!=1.0 || ctx->Pixel.DepthBias!=0.0) {
+            for (j=0;j<width;j++) {
+               depth[j] = depth[j] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
+            }
+         }
+
+         /* clamp depth values to [0,1] and convert from floats to integers */
+         for (j=0;j<width;j++) {
+            zspan[j] = (GLdepth) (CLAMP( depth[j], 0.0F, 1.0F ) * DEPTH_SCALE);
+         }
+
+         if (ctx->Visual->RGBAflag) {
+            if (zoom) {
+               gl_write_zoomed_rgba_span( ctx, width, x, y, zspan,
+                                          (const GLubyte (*)[4])rgba, desty );
+            }
+            else {
+               gl_write_rgba_span( ctx, width, x, y, zspan, rgba, GL_BITMAP );
+            }
+         }
+         else {
+            if (zoom) {
+               gl_write_zoomed_index_span( ctx, width, x, y, zspan,
+                                           ispan, GL_BITMAP );
+            }
+            else {
+               gl_write_index_span( ctx, width, x, y, zspan, ispan, GL_BITMAP );
+            }
+         }
+
+      }
+   }
+}
+
+
+
+/* Simple unpacking parameters: */
+static struct gl_pixelstore_attrib NoUnpack = {
+   1,            /* Alignment */
+   0,            /* RowLength */
+   0,            /* SkipPixels */
+   0,            /* SkipRows */
+   0,            /* ImageHeight */
+   0,            /* SkipImages */
+   GL_FALSE,     /* SwapBytes */
+   GL_FALSE      /* LsbFirst */
+};
+
+
+/*
+ * Do glDrawPixels of RGBA pixels.
+ */
+static void draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
+                              const struct gl_image *image )
+{
+   GLint width, height;
+   GLint i, j;
+   const GLint desty = y;
+   GLdepth zspan[MAX_WIDTH];
+   GLboolean quickDraw;
+   const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
+
+   assert(image);
+
+   /* Try an optimized glDrawPixels first */
+   if (gl_direct_DrawPixels(ctx, &NoUnpack, image->Width, image->Height,
+                            image->Format, image->Type, image->Data ))
+      return;
+
+   width = image->Width;
+   height = image->Height;
+
+   /* Fragment depth values */
+   if (ctx->Depth.Test) {
+      /* fill in array of z values */
+      GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * DEPTH_SCALE);
+      for (i=0;i<width;i++) {
+	 zspan[i] = z;
+      }
+   }
+
+   if (ctx->RasterMask==0 && !zoom && x>=0 && y>=0
+       && x+width<=ctx->Buffer->Width && y+height<=ctx->Buffer->Height) {
+      quickDraw = GL_TRUE;
+   }
+   else {
+      quickDraw = GL_FALSE;
+   }
+
+   {
+      /* General solution */
+      GLboolean r_flag, g_flag, b_flag, a_flag, l_flag;
+      GLuint components;
+      GLubyte rgba[MAX_WIDTH][4];
+      GLfloat  rf[MAX_WIDTH];
+      GLfloat  gf[MAX_WIDTH];
+      GLfloat  bf[MAX_WIDTH];
+      DEFARRAY(GLfloat,af,MAX_WIDTH);
+      CHECKARRAY(af,return);
+
+      r_flag = g_flag = b_flag = a_flag = l_flag = GL_FALSE;
+      switch (image->Format) {
+	 case GL_RED:
+	    r_flag = GL_TRUE;
+	    components = 1;
+	    break;
+	 case GL_GREEN:
+	    g_flag = GL_TRUE;
+	    components = 1;
+	    break;
+	 case GL_BLUE:
+	    b_flag = GL_TRUE;
+	    components = 1;
+	    break;
+	 case GL_ALPHA:
+	    a_flag = GL_TRUE;
+	    components = 1;
+	    break;
+	 case GL_RGB:
+	    r_flag = g_flag = b_flag = GL_TRUE;
+	    components = 3;
+	    break;
+	 case GL_LUMINANCE:
+	    l_flag = GL_TRUE;
+	    components = 1;
+	    break;
+	 case GL_LUMINANCE_ALPHA:
+	    l_flag = a_flag = GL_TRUE;
+	    components = 2;
+	    break;
+	 case GL_RGBA:
+	    r_flag = g_flag = b_flag = a_flag = GL_TRUE;
+	    components = 4;
+	    break;
+         default:
+            gl_problem(ctx, "Bad type in draw_rgba_pixels");
+            goto cleanup;
+      }
+
+      /* process the image row by row */
+      for (i=0;i<height;i++,y++) {
+	 /* convert to floats */
+	 switch (image->Type) {
+	    case GL_UNSIGNED_BYTE:
+	       {
+		  GLubyte *src = (GLubyte *) image->Data + i * width * components;
+		  for (j=0;j<width;j++) {
+		     if (l_flag) {
+			rf[j] = gf[j] = bf[j] = UBYTE_TO_FLOAT(*src++);
+		     }
+		     else {
+			rf[j] = r_flag ? UBYTE_TO_FLOAT(*src++) : 0.0;
+			gf[j] = g_flag ? UBYTE_TO_FLOAT(*src++) : 0.0;
+			bf[j] = b_flag ? UBYTE_TO_FLOAT(*src++) : 0.0;
+		     }
+		     af[j] = a_flag ? UBYTE_TO_FLOAT(*src++) : 1.0;
+		  }
+	       }
+	       break;
+	    case GL_FLOAT:
+	       {
+		  GLfloat *src = (GLfloat *) image->Data + i * width * components;
+		  for (j=0;j<width;j++) {
+		     if (l_flag) {
+			rf[j] = gf[j] = bf[j] = *src++;
+		     }
+		     else {
+			rf[j] = r_flag ? *src++ : 0.0;
+			gf[j] = g_flag ? *src++ : 0.0;
+			bf[j] = b_flag ? *src++ : 0.0;
+		     }
+		     af[j] = a_flag ? *src++ : 1.0;
+		  }
+	       }
+	       break;
+	    default:
+	       gl_problem( ctx, "draw_rgba_pixels type" );
+               goto cleanup;
+	 }
+
+	 /* apply scale and bias */
+	 if (ctx->Pixel.ScaleOrBiasRGBA) {
+            gl_scale_and_bias_color(ctx, width, rf, gf, bf, af);
+	 }
+
+	 /* apply pixel mappings */
+	 if (ctx->Pixel.MapColorFlag) {
+            gl_map_color(ctx, width, rf, gf, bf, af);
+	 }
+
+	 /* convert to integers */
+	 for (j=0;j<width;j++) {
+	    rgba[j][RCOMP] = (GLint) (rf[j] * 255.0F);
+	    rgba[j][GCOMP] = (GLint) (gf[j] * 255.0F);
+	    rgba[j][BCOMP] = (GLint) (bf[j] * 255.0F);
+	    rgba[j][ACOMP] = (GLint) (af[j] * 255.0F);
+	 }
+
+	 /* write to frame buffer */
+         if (quickDraw) {
+            (*ctx->Driver.WriteRGBASpan)( ctx, width, x, y, 
+					  (const GLubyte (*)[4])rgba, NULL);
+         }
+         else if (zoom) {
+            gl_write_zoomed_rgba_span( ctx, width, x, y, zspan, 
+				       (const GLubyte (*)[4])rgba, desty );
+         }
+         else {
+            gl_write_rgba_span( ctx, (GLuint) width, x, y, zspan, rgba, GL_BITMAP);
+         }
+      }
+cleanup:
+      UNDEFARRAY(af);
+   }
+}
+
+
+
+/*
+ * Execute glDrawPixels
+ */
+void gl_DrawPixels( GLcontext* ctx, struct gl_image *image )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glDrawPixels");
+
+
+   if (gl_image_error_test( ctx, image, "glDrawPixels" ))
+      return;
+
+   if (ctx->RenderMode==GL_RENDER) {
+      GLint x, y;
+      if (!ctx->Current.RasterPosValid) {
+	 return;
+      }
+
+      x = (GLint) (ctx->Current.RasterPos[0] + 0.5F);
+      y = (GLint) (ctx->Current.RasterPos[1] + 0.5F);
+
+      switch (image->Format) {
+	 case GL_COLOR_INDEX:
+            draw_index_pixels( ctx, x, y, image );
+	    break;
+	 case GL_STENCIL_INDEX:
+	    draw_stencil_pixels( ctx, x, y, image );
+	    break;
+	 case GL_DEPTH_COMPONENT:
+	    draw_depth_pixels( ctx, x, y, image );
+	    break;
+	 case GL_RED:
+	 case GL_GREEN:
+	 case GL_BLUE:
+	 case GL_ALPHA:
+	 case GL_RGB:
+	 case GL_LUMINANCE:
+	 case GL_LUMINANCE_ALPHA:
+	 case GL_RGBA:
+            draw_rgba_pixels( ctx, x, y, image );
+	    break;
+	 default:
+	    gl_error( ctx, GL_INVALID_ENUM, "glDrawPixels" );
+            return;
+      }
+   }
+   else if (ctx->RenderMode==GL_FEEDBACK) {
+      if (ctx->Current.RasterPosValid) {
+         GLfloat color[4];
+	 GLfloat texcoord[4], invq;
+	 UBYTE_RGBA_TO_FLOAT_RGBA(color, ctx->Current.ByteColor);
+         invq = 1.0F / ctx->Current.Texcoord[0][3];
+         texcoord[0] = ctx->Current.Texcoord[0][0] * invq;
+         texcoord[1] = ctx->Current.Texcoord[0][1] * invq;
+         texcoord[2] = ctx->Current.Texcoord[0][2] * invq;
+         texcoord[3] = ctx->Current.Texcoord[0][3];
+         FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
+         gl_feedback_vertex( ctx,
+                             ctx->Current.RasterPos[0],
+                             ctx->Current.RasterPos[1],
+                             ctx->Current.RasterPos[2],
+                             ctx->Current.RasterPos[3],
+                             color, ctx->Current.Index, texcoord );
+      }
+   }
+   else if (ctx->RenderMode==GL_SELECT) {
+      if (ctx->Current.RasterPosValid) {
+         gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
+      }
+   }
+}
+
-- 
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