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/svgamesa8.c | 191 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 191 insertions(+)
 create mode 100644 src/mesa/drivers/svga/svgamesa8.c

(limited to 'src/mesa/drivers/svga/svgamesa8.c')

diff --git a/src/mesa/drivers/svga/svgamesa8.c b/src/mesa/drivers/svga/svgamesa8.c
new file mode 100644
index 0000000..29fd407
--- /dev/null
+++ b/src/mesa/drivers/svga/svgamesa8.c
@@ -0,0 +1,191 @@
+/* $Id: svgamesa8.c,v 1.8 2001/02/06 00:03:48 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.3
+ * 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.
+ */
+
+
+/*
+ * 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 "svgamesa8.h"
+#include "swrast/swrast.h"
+
+
+static void __svga_drawpixel8(int x, int y, unsigned long c)
+{
+    unsigned long offset;
+    y = SVGAInfo->height-y-1;
+    offset = y * SVGAInfo->linewidth + x;
+    SVGABuffer.DrawBuffer[offset]=c;
+}
+
+static unsigned long __svga_getpixel8(int x, int y)
+{
+    unsigned long offset;
+    y = SVGAInfo->height-y-1;
+    offset = y * SVGAInfo->linewidth + x;
+    return SVGABuffer.ReadBuffer[offset];
+}
+
+void __clear_index8( GLcontext *ctx, GLuint index )
+{
+   SVGAMesa->clear_index = index;
+}
+
+void __clear8( 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) { 
+         memset(SVGABuffer.FrontBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
+         for (i=x;i<width;i++)
+            for (j=y;j<height;j++)
+               __svga_drawpixel8(i,j,SVGAMesa->clear_index);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+      mask &= ~DD_FRONT_LEFT_BIT;
+   }
+   if (mask & DD_BACK_LEFT_BIT) {
+      if (all) { 
+         memset(SVGABuffer.BackBuffer, SVGAMesa->clear_index, SVGABuffer.BufferSize);
+      }
+      else {
+         GLubyte *tmp = SVGABuffer.DrawBuffer;
+         SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
+         for (i=x;i<width;i++)
+            for (j=y;j<height;j++)
+               __svga_drawpixel8(i,j,SVGAMesa->clear_index);
+         SVGABuffer.DrawBuffer = tmp;
+      }
+      mask &= ~DD_BACK_LEFT_BIT;
+   }
+
+   if (mask)
+      _swrast_Clear( ctx, mask, all, x, y, width, height );
+}
+
+void __write_ci32_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                         const GLuint index[], const GLubyte mask[] )
+{
+   int i;
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         __svga_drawpixel8( x, y, index[i]);
+      }
+   }
+}
+
+void __write_ci8_span8( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                        const GLubyte index[], const GLubyte mask[] )
+{
+   int i;
+
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         __svga_drawpixel8( x, y, index[i]);
+      }
+   }
+}
+
+void __write_mono_ci_span8( const GLcontext *ctx, GLuint n,
+                            GLint x, GLint y,
+                            GLuint colorIndex, const GLubyte mask[] )
+{
+   int i;
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         __svga_drawpixel8( x, y, colorIndex);
+      }
+   }
+}
+
+void __read_ci32_span8( const GLcontext *ctx,
+                        GLuint n, GLint x, GLint y, GLuint index[])
+{
+   int i;
+   for (i=0; i<n; i++,x++) {
+      index[i] = __svga_getpixel8( x, y);
+   }
+}
+
+void __write_ci32_pixels8( const GLcontext *ctx,
+                           GLuint n, const GLint x[], const GLint y[],
+                           const GLuint index[], const GLubyte mask[] )
+{
+   int i;
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         __svga_drawpixel8( x[i], y[i], index[i]);
+      }
+   }
+}
+
+
+void __write_mono_ci_pixels8( const GLcontext *ctx, GLuint n,
+                              const GLint x[], const GLint y[],
+                              GLuint colorIndex, const GLubyte mask[] )
+{
+   int i;
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         __svga_drawpixel8( x[i], y[i], colorIndex);
+      }
+   }
+}
+
+void __read_ci32_pixels8( const GLcontext *ctx,
+                          GLuint n, const GLint x[], const GLint y[],
+                          GLuint index[], const GLubyte mask[] )
+{
+   int i;
+   for (i=0; i<n; i++,x++) {
+      index[i] = __svga_getpixel8( x[i], y[i]);
+   }
+}
+
+
+#else
+
+
+/* silence compiler warning */
+extern void _mesa_svga8_dummy_function(void);
+void _mesa_svga8_dummy_function(void)
+{
+}
+
+
+#endif
-- 
cgit