Moved software rasterizer functionality to new directory.

1 files changed, 453 insertions, 0 deletions

diff --git a/src/mesa/swrast/s_zoom.c b/src/mesa/swrast/s_zoom.c
new file mode 100644
index 0000000000..3520fd506a
--- /dev/null
+++ b/src/mesa/swrast/s_zoom.c
@@ -0,0 +1,453 @@
+/* $Id: s_zoom.c,v 1.1 2000/10/31 18:00:05 keithw 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.
+ */
+
+#include "glheader.h"
+#include "macros.h"
+
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_zoom.h"
+
+
+
+/*
+ * Write a span of pixels to the frame buffer while applying a pixel zoom.
+ * This is only used by glDrawPixels and glCopyPixels.
+ * Input:  n - number of pixels in input row
+ *         x, y - destination of the span
+ *         z - depth values for the span
+ *         red, green, blue, alpha - array of colors
+ *         y0 - location of first row in the image we're drawing.
+ */
+void
+gl_write_zoomed_rgba_span( GLcontext *ctx,
+                           GLuint n, GLint x, GLint y, const GLdepth z[],
+			   const GLfixed *fog,
+                           CONST GLchan rgba[][4], GLint y0 )
+{
+   GLint m;
+   GLint r0, r1, row, r;
+   GLint i, j, skipcol;
+   GLchan zrgba[MAX_WIDTH][4];  /* zoomed pixel colors */
+   GLdepth zdepth[MAX_WIDTH];  /* zoomed depth values */
+   GLfixed zfog[MAX_WIDTH];  /* zoomed fog values */
+   GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+   const GLuint *srcRGBA32 = (const GLuint *) rgba;
+   GLuint *dstRGBA32 = (GLuint *) zrgba;
+
+   /* compute width of output row */
+   m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+   if (m==0) {
+      return;
+   }
+   if (ctx->Pixel.ZoomX<0.0) {
+      /* adjust x coordinate for left/right mirroring */
+      x = x - m;
+   }
+
+   /* compute which rows to draw */
+   row = y-y0;
+   r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
+   r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
+   if (r0==r1) {
+      return;
+   }
+   else if (r1<r0) {
+      GLint rtmp = r1;
+      r1 = r0;
+      r0 = rtmp;
+   }
+
+   /* return early if r0...r1 is above or below window */
+   if (r0<0 && r1<0) {
+      /* below window */
+      return;
+   }
+   if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+      /* above window */
+      return;
+   }
+
+   /* check if left edge is outside window */
+   skipcol = 0;
+   if (x<0) {
+      skipcol = -x;
+      m += x;
+   }
+   /* make sure span isn't too long or short */
+   if (m>maxwidth) {
+      m = maxwidth;
+   }
+   else if (m<=0) {
+      return;
+   }
+
+   assert( m <= MAX_WIDTH );
+
+   /* zoom the span horizontally */
+   if (ctx->Pixel.ZoomX==-1.0F) {
+      /* n==m */
+      for (j=0;j<m;j++) {
+         i = n - (j+skipcol) - 1;
+         dstRGBA32[j] = srcRGBA32[i];
+         zdepth[j] = z[i];
+      }
+      if (fog && ctx->Fog.Enabled) {
+	 for (j=0;j<m;j++) {
+	    i = n - (j+skipcol) - 1;
+	    zfog[j] = fog[i];
+	 }
+      }
+   }
+   else {
+      GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+      for (j=0;j<m;j++) {
+         i = (GLint) ((j+skipcol) * xscale);
+         if (i<0)  i = n + i - 1;
+         dstRGBA32[j] = srcRGBA32[i];
+         zdepth[j] = z[i];
+      }
+      if (fog && ctx->Fog.Enabled) {
+	 for (j=0;j<m;j++) {
+	    i = (GLint) ((j+skipcol) * xscale);
+	    if (i<0)  i = n + i - 1;
+	    zfog[j] = fog[i];
+	 }
+      }
+   }
+
+   /* write the span */
+   for (r=r0; r<r1; r++) {
+      gl_write_rgba_span( ctx, m, x+skipcol, r, zdepth, 
+			  (fog ? zfog : 0),
+			  zrgba, GL_BITMAP );
+   }
+}
+
+
+
+void
+gl_write_zoomed_rgb_span( GLcontext *ctx,
+                          GLuint n, GLint x, GLint y, const GLdepth z[],
+			  const GLfixed *fog,
+                          CONST GLchan rgb[][3], GLint y0 )
+{
+   GLint m;
+   GLint r0, r1, row, r;
+   GLint i, j, skipcol;
+   GLchan zrgba[MAX_WIDTH][4];  /* zoomed pixel colors */
+   GLdepth zdepth[MAX_WIDTH];  /* zoomed depth values */
+   GLfixed zfog[MAX_WIDTH];  /* zoomed fog values */
+   GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+
+   /* compute width of output row */
+   m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+   if (m==0) {
+      return;
+   }
+   if (ctx->Pixel.ZoomX<0.0) {
+      /* adjust x coordinate for left/right mirroring */
+      x = x - m;
+   }
+
+   /* compute which rows to draw */
+   row = y-y0;
+   r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
+   r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
+   if (r0==r1) {
+      return;
+   }
+   else if (r1<r0) {
+      GLint rtmp = r1;
+      r1 = r0;
+      r0 = rtmp;
+   }
+
+   /* return early if r0...r1 is above or below window */
+   if (r0<0 && r1<0) {
+      /* below window */
+      return;
+   }
+   if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+      /* above window */
+      return;
+   }
+
+   /* check if left edge is outside window */
+   skipcol = 0;
+   if (x<0) {
+      skipcol = -x;
+      m += x;
+   }
+   /* make sure span isn't too long or short */
+   if (m>maxwidth) {
+      m = maxwidth;
+   }
+   else if (m<=0) {
+      return;
+   }
+
+   assert( m <= MAX_WIDTH );
+
+   /* zoom the span horizontally */
+   if (ctx->Pixel.ZoomX==-1.0F) {
+      /* n==m */
+      for (j=0;j<m;j++) {
+         i = n - (j+skipcol) - 1;
+         zrgba[j][0] = rgb[i][0];
+         zrgba[j][1] = rgb[i][1];
+         zrgba[j][2] = rgb[i][2];
+         zrgba[j][3] = CHAN_MAX;
+         zdepth[j] = z[i];
+      }
+      if (fog && ctx->Fog.Enabled) {
+	 for (j=0;j<m;j++) {
+	    i = n - (j+skipcol) - 1;
+	    zfog[j] = fog[i];
+	 }
+      }
+   }
+   else {
+      GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+      for (j=0;j<m;j++) {
+         i = (GLint) ((j+skipcol) * xscale);
+         if (i<0)  i = n + i - 1;
+         zrgba[j][0] = rgb[i][0];
+         zrgba[j][1] = rgb[i][1];
+         zrgba[j][2] = rgb[i][2];
+         zrgba[j][3] = CHAN_MAX;
+         zdepth[j] = z[i];
+      }
+      if (fog && ctx->Fog.Enabled) {
+	 for (j=0;j<m;j++) {
+	    i = (GLint) ((j+skipcol) * xscale);
+	    if (i<0)  i = n + i - 1;
+	    zfog[j] = fog[i];
+	 }
+      }
+   }
+
+   /* write the span */
+   for (r=r0; r<r1; r++) {
+      gl_write_rgba_span( ctx, m, x+skipcol, r, zdepth, 
+			  (fog ? zfog : 0), zrgba, GL_BITMAP );
+   }
+}
+
+
+
+/*
+ * As above, but write CI pixels.
+ */
+void
+gl_write_zoomed_index_span( GLcontext *ctx,
+                            GLuint n, GLint x, GLint y, const GLdepth z[],
+			    const GLfixed *fog,
+                            const GLuint indexes[], GLint y0 )
+{
+   GLint m;
+   GLint r0, r1, row, r;
+   GLint i, j, skipcol;
+   GLuint zindexes[MAX_WIDTH];  /* zoomed color indexes */
+   GLdepth zdepth[MAX_WIDTH];  /* zoomed depth values */
+   GLfixed zfog[MAX_WIDTH];  /* zoomed fog values */
+   GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+
+   /* compute width of output row */
+   m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+   if (m==0) {
+      return;
+   }
+   if (ctx->Pixel.ZoomX<0.0) {
+      /* adjust x coordinate for left/right mirroring */
+      x = x - m;
+   }
+
+   /* compute which rows to draw */
+   row = y-y0;
+   r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
+   r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
+   if (r0==r1) {
+      return;
+   }
+   else if (r1<r0) {
+      GLint rtmp = r1;
+      r1 = r0;
+      r0 = rtmp;
+   }
+
+   /* return early if r0...r1 is above or below window */
+   if (r0<0 && r1<0) {
+      /* below window */
+      return;
+   }
+   if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+      /* above window */
+      return;
+   }
+
+   /* check if left edge is outside window */
+   skipcol = 0;
+   if (x<0) {
+      skipcol = -x;
+      m += x;
+   }
+   /* make sure span isn't too long or short */
+   if (m>maxwidth) {
+      m = maxwidth;
+   }
+   else if (m<=0) {
+      return;
+   }
+
+   assert( m <= MAX_WIDTH );
+
+   /* zoom the span horizontally */
+   if (ctx->Pixel.ZoomX==-1.0F) {
+      /* n==m */
+      for (j=0;j<m;j++) {
+         i = n - (j+skipcol) - 1;
+         zindexes[j] = indexes[i];
+         zdepth[j]   = z[i];
+      }
+      if (fog && ctx->Fog.Enabled) {
+	 for (j=0;j<m;j++) {
+	    i = n - (j+skipcol) - 1;
+	    zfog[j] = fog[i];
+	 }
+      }
+   }
+   else {
+      GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+      for (j=0;j<m;j++) {
+         i = (GLint) ((j+skipcol) * xscale);
+         if (i<0)  i = n + i - 1;
+         zindexes[j] = indexes[i];
+         zdepth[j] = z[i];
+      }
+      if (fog && ctx->Fog.Enabled) {
+	 for (j=0;j<m;j++) {
+	    i = (GLint) ((j+skipcol) * xscale);
+	    if (i<0)  i = n + i - 1;
+	    zfog[j] = fog[i];
+	 }
+      }
+   }
+
+   /* write the span */
+   for (r=r0; r<r1; r++) {
+      gl_write_index_span( ctx, m, x+skipcol, r, zdepth, 
+			   (fog ? zfog : 0), zindexes, GL_BITMAP );
+   }
+}
+
+
+
+/*
+ * As above, but write stencil values.
+ */
+void
+gl_write_zoomed_stencil_span( GLcontext *ctx,
+                              GLuint n, GLint x, GLint y,
+                              const GLstencil stencil[], GLint y0 )
+{
+   GLint m;
+   GLint r0, r1, row, r;
+   GLint i, j, skipcol;
+   GLstencil zstencil[MAX_WIDTH];  /* zoomed stencil values */
+   GLint maxwidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
+
+   /* compute width of output row */
+   m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
+   if (m==0) {
+      return;
+   }
+   if (ctx->Pixel.ZoomX<0.0) {
+      /* adjust x coordinate for left/right mirroring */
+      x = x - m;
+   }
+
+   /* compute which rows to draw */
+   row = y-y0;
+   r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
+   r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
+   if (r0==r1) {
+      return;
+   }
+   else if (r1<r0) {
+      GLint rtmp = r1;
+      r1 = r0;
+      r0 = rtmp;
+   }
+
+   /* return early if r0...r1 is above or below window */
+   if (r0<0 && r1<0) {
+      /* below window */
+      return;
+   }
+   if (r0>=ctx->DrawBuffer->Height && r1>=ctx->DrawBuffer->Height) {
+      /* above window */
+      return;
+   }
+
+   /* check if left edge is outside window */
+   skipcol = 0;
+   if (x<0) {
+      skipcol = -x;
+      m += x;
+   }
+   /* make sure span isn't too long or short */
+   if (m>maxwidth) {
+      m = maxwidth;
+   }
+   else if (m<=0) {
+      return;
+   }
+
+   assert( m <= MAX_WIDTH );
+
+   /* zoom the span horizontally */
+   if (ctx->Pixel.ZoomX==-1.0F) {
+      /* n==m */
+      for (j=0;j<m;j++) {
+         i = n - (j+skipcol) - 1;
+         zstencil[j] = stencil[i];
+      }
+   }
+   else {
+      GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+      for (j=0;j<m;j++) {
+         i = (GLint) ((j+skipcol) * xscale);
+         if (i<0)  i = n + i - 1;
+         zstencil[j] = stencil[i];
+      }
+   }
+
+   /* write the span */
+   for (r=r0; r<r1; r++) {
+      _mesa_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
+   }
+}