From 2702c90d7a39fca2a3319c5e915fd290cb31fc70 Mon Sep 17 00:00:00 2001
From: Radosław Kujawa <radoslaw.kujawa@c0ff33.net>
Date: Fri, 17 Jul 2026 14:54:32 +0200
Subject: Initial import.

---
 src/mesa/drivers/svga/svgamesa24.c | 239 +++++++++++++++++++++++++++++++++++++
 1 file changed, 239 insertions(+)
 create mode 100644 src/mesa/drivers/svga/svgamesa24.c

(limited to 'src/mesa/drivers/svga/svgamesa24.c')

diff --git a/src/mesa/drivers/svga/svgamesa24.c b/src/mesa/drivers/svga/svgamesa24.c
new file mode 100644
index 0000000..07491cc
--- /dev/null
+++ b/src/mesa/drivers/svga/svgamesa24.c
@@ -0,0 +1,239 @@
+/* $Id: svgamesa24.c,v 1.12 2002/11/11 18:42:41 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  5.0
+ * Copyright (C) 1995-2002  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.
+ */
+
+
+/*
+ * SVGA driver for Mesa.
+ * Original author:  Brian Paul
+ * Additional authors:  Slawomir Szczyrba <steev@hot.pl>  (Mesa 3.2)
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "conf.h"
+#endif
+
+#ifdef SVGA
+
+#include "svgapix.h"
+#include "svgamesa24.h"
+#include "swrast/swrast.h"
+
+
+#if 0
+/* this doesn't compile with GCC on RedHat 6.1 */
+static inline int RGB2BGR24(int c)
+{
+	asm("rorw  $8, %0\n"	 
+	    "rorl $16, %0\n"	 
+	    "rorw  $8, %0\n"	 
+	    "shrl  $8, %0\n"	 
+      : "=q"(c):"0"(c));
+    return c;
+}
+#else
+static unsigned long RGB2BGR24(unsigned long color)
+{
+   return (color & 0xff00)|(color>>16)|((color & 0xff)<<16);
+}
+#endif
+
+static void __svga_drawpixel24(int x, int y, GLubyte r, GLubyte g, GLubyte b)
+{
+    unsigned long offset;
+
+    _RGB *rgbBuffer=(void *)SVGABuffer.DrawBuffer;
+    y = SVGAInfo->height-y-1;
+    offset = y * SVGAInfo->width + x;
+
+    rgbBuffer[offset].r=r;
+    rgbBuffer[offset].g=g;
+    rgbBuffer[offset].b=b;
+}
+
+static unsigned long __svga_getpixel24(int x, int y)
+{
+    unsigned long offset;
+
+    _RGB *rgbBuffer=(void *)SVGABuffer.ReadBuffer;
+    y = SVGAInfo->height-y-1;
+    offset = y * SVGAInfo->width + x;
+    return rgbBuffer[offset].r<<16 | rgbBuffer[offset].g<<8 | rgbBuffer[offset].b;
+}
+
+void __clear_color24( GLcontext *ctx, const GLfloat color[4] )
+{
+   GLubyte col[3];
+   CLAMPED_FLOAT_TO_UBYTE(col[0], color[0]);
+   CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);
+   CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);
+   SVGAMesa->clear_red = col[0];
+   SVGAMesa->clear_green = col[1];
+   SVGAMesa->clear_blue = col[2];
+/*   SVGAMesa->clear_truecolor = red<<16 | green<<8 | blue; */
+}
+
+void __clear24( GLcontext *ctx, GLbitfield mask, GLboolean all,
+                GLint x, GLint y, GLint width, GLint height )
+{
+   int i,j;
+   
+   if (mask & DD_FRONT_LEFT_BIT) {
+      if (all) {
+         _RGB *rgbBuffer=(void *)SVGABuffer.FrontBuffer;
+         for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
+            rgbBuffer[i].r=SVGAMesa->clear_red;
+            rgbBuffer[i].g=SVGAMesa->clear_green;
+            rgbBuffer[i].b=SVGAMesa->clear_blue;
+         } 
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
+         for (i=x;i<width;i++)    
+            for (j=y;j<height;j++)    
+               __svga_drawpixel24( i, j, SVGAMesa->clear_red,
+                                   SVGAMesa->clear_green,
+                                   SVGAMesa->clear_blue);
+         SVGABuffer.DrawBuffer = tmp;
+      }	
+      mask &= ~DD_FRONT_LEFT_BIT;
+   }
+   if (mask & DD_BACK_LEFT_BIT) {
+      if (all) {
+         _RGB *rgbBuffer=(void *)SVGABuffer.BackBuffer;
+         for (i=0;i<SVGABuffer.BufferSize / 3;i++) {
+            rgbBuffer[i].r=SVGAMesa->clear_red;
+            rgbBuffer[i].g=SVGAMesa->clear_green;
+            rgbBuffer[i].b=SVGAMesa->clear_blue;
+         } 
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+         for (i=x;i<width;i++)    
+            for (j=y;j<height;j++)    
+               __svga_drawpixel24( i, j, SVGAMesa->clear_red,
+                                   SVGAMesa->clear_green,
+                                   SVGAMesa->clear_blue);
+         SVGABuffer.DrawBuffer = tmp;
+      }	
+      mask &= ~DD_BACK_LEFT_BIT;
+   }
+
+   if (mask)
+      _swrast_Clear( ctx, mask, all, x, y, width, height );
+}
+
+void __write_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                          const GLubyte rgba[][4], const GLubyte mask[] )
+{
+   int i;
+   if (mask) {
+      /* draw some pixels */
+      for (i=0; i<n; i++, x++) {
+         if (mask[i]) {
+         __svga_drawpixel24( x, y, rgba[i][RCOMP],
+	                           rgba[i][GCOMP],
+				   rgba[i][BCOMP]);
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0; i<n; i++, x++) {
+         __svga_drawpixel24( x, y, rgba[i][RCOMP],
+	                           rgba[i][GCOMP],
+				   rgba[i][BCOMP]);
+      }
+   }
+}
+
+void __write_mono_rgba_span24( const GLcontext *ctx,
+                               GLuint n, GLint x, GLint y,
+                               const GLchan color[4], const GLubyte mask[])
+{
+   int i;
+   for (i=0; i<n; i++, x++) {
+      if (mask[i]) {
+         __svga_drawpixel24( x, y, color[RCOMP], color[GCOMP], color[BCOMP]);
+      }
+   }
+}
+
+void __read_rgba_span24( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                         GLubyte rgba[][4] )
+{
+   int i;
+   for (i=0; i<n; i++, x++) {
+    *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x, y));
+   }
+}
+
+void __write_rgba_pixels24( const GLcontext *ctx,
+                            GLuint n, const GLint x[], const GLint y[],
+                            const GLubyte rgba[][4], const GLubyte mask[] )
+{
+   int i;
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         __svga_drawpixel24( x[i], y[i], rgba[i][RCOMP],
+	                                 rgba[i][GCOMP],
+				         rgba[i][BCOMP]);
+      }
+   }
+}
+
+void __write_mono_rgba_pixels24( const GLcontext *ctx,
+                                 GLuint n,
+                                 const GLint x[], const GLint y[],
+                                 const GLchan color[4], const GLubyte mask[] )
+{
+   int i;
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         __svga_drawpixel24( x[i], y[i],
+                             color[RCOMP], color[GCOMP], color[BCOMP] );
+      }
+   }
+}
+
+void __read_rgba_pixels24( const GLcontext *ctx,
+                           GLuint n, const GLint x[], const GLint y[],
+                           GLubyte rgba[][4], const GLubyte mask[] )
+{
+   int i;
+   for (i=0; i<n; i++,x++) {
+    *((GLint*)rgba[i]) = RGB2BGR24(__svga_getpixel24( x[i], y[i]));    
+   }
+}
+
+#else
+
+
+/* silence compiler warning */
+extern void _mesa_svga24_dummy_function(void);
+void _mesa_svga24_dummy_function(void)
+{
+}
+
+
+#endif
-- 
cgit