Initial revision

1 files changed, 540 insertions, 0 deletions

diff --git a/src/mesa/drivers/svga/svgamesa.c b/src/mesa/drivers/svga/svgamesa.c
new file mode 100644
index 00000000000..4c4d9f793e0
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+++ b/src/mesa/drivers/svga/svgamesa.c
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+/* $Id: svgamesa.c,v 1.1 1999/08/19 00:55:42 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.0
+ * Copyright (C) 1995-1998  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.
+ */
+
+
+
+/*
+ * Linux SVGA/Mesa interface.
+ *
+ * This interface is not finished!  Still have to implement pixel
+ * reading functions and double buffering.  Then, look into accelerated
+ * line and polygon rendering.  And, clean up a bunch of other stuff.
+ * Any volunteers?
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "conf.h"
+#endif
+
+#ifdef SVGA
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#include <vga.h>
+#include "GL/svgamesa.h"
+#include "context.h"
+#include "matrix.h"
+#include "types.h"
+#endif
+
+
+struct svgamesa_context {
+   GLcontext *gl_ctx;		/* the core Mesa context */
+   GLvisual *gl_vis;		/* describes the color buffer */
+   GLframebuffer *gl_buffer;	/* the ancillary buffers */
+   GLuint index;		/* current color index */
+   GLint red, green, blue;	/* current rgb color */
+   GLint width, height;		/* size of color buffer */
+   GLint depth;			/* bits per pixel (8,16,24 or 32) */
+};
+
+
+static SVGAMesaContext SVGAMesa = NULL;    /* the current context */
+
+
+
+/*
+ * Convert Mesa window Y coordinate to VGA screen Y coordinate:
+ */
+#define FLIP(Y)  (SVGAMesa->height-(Y)-1)
+
+
+
+/**********************************************************************/
+/*****                 Miscellaneous functions                    *****/
+/**********************************************************************/
+
+
+static void get_buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
+{
+   *width = SVGAMesa->width = vga_getxdim();
+   *height = SVGAMesa->height = vga_getydim();
+}
+
+
+/* Set current color index */
+static void set_index( GLcontext *ctx, GLuint index )
+{
+   SVGAMesa->index = index;
+   vga_setcolor( index );
+}
+
+
+/* Set current drawing color */
+static void set_color( GLcontext *ctx,
+                       GLubyte red, GLubyte green,
+                       GLubyte blue, GLubyte alpha )
+{
+   SVGAMesa->red = red;
+   SVGAMesa->green = green;
+   SVGAMesa->blue = blue;
+   vga_setrgbcolor( red, green, blue );
+}
+
+
+static void clear_index( GLcontext *ctx, GLuint index )
+{
+   /* TODO: Implements glClearIndex() */
+}
+
+
+static void clear_color( GLcontext *ctx,
+                         GLubyte red, GLubyte green,
+                         GLubyte blue, GLubyte alpha )
+{
+   /* TODO: Implements glClearColor() */
+}
+
+
+static GLbitfield clear( GLcontext *ctx, GLbitfield mask, GLboolean all,
+                         GLint x, GLint y, GLint width, GLint height )
+{
+   if (mask & GL_COLOR_BUFFER_BIT) {
+      vga_clear();
+   }
+   return mask & (~GL_COLOR_BUFFER_BIT);
+}
+
+
+static GLboolean set_buffer( GLcontext *ctx, GLenum buffer )
+{
+   /* TODO: implement double buffering and use this function to select */
+   /* between front and back buffers. */
+   if (buffer == GL_FRONT_LEFT)
+      return GL_TRUE;
+   else if (buffer == GL_BACK_LEFT)
+      return GL_TRUE;
+   else
+      return GL_FALSE;
+}
+
+
+
+
+/**********************************************************************/
+/*****            Write spans of pixels                           *****/
+/**********************************************************************/
+
+
+static void write_ci32_span( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                             const GLuint index[], const GLubyte mask[] )
+{
+   int i;
+   y = FLIP(y);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         vga_setcolor( index[i] );
+         vga_drawpixel( x, y );
+      }
+   }
+}
+
+static void write_ci8_span( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                            const GLubyte index[], const GLubyte mask[] )
+{
+   int i;
+   y = FLIP(y);
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         vga_setcolor( index[i] );
+         vga_drawpixel( x, y );
+      }
+   }
+}
+
+
+
+static void write_mono_ci_span( const GLcontext *ctx, GLuint n,
+                                GLint x, GLint y, const GLubyte mask[] )
+{
+   int i;
+   y = FLIP(y);
+   /* use current color index */
+   vga_setcolor( SVGAMesa->index );
+   for (i=0;i<n;i++,x++) {
+      if (mask[i]) {
+         vga_drawpixel( x, y );
+      }
+   }
+}
+
+
+
+static void write_rgba_span( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                             const GLubyte rgba[][4], const GLubyte mask[] )
+{
+   int i;
+   y=FLIP(y);
+   if (mask) {
+      /* draw some pixels */
+      for (i=0; i<n; i++, x++) {
+         if (mask[i]) {
+            vga_setrgbcolor( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+            vga_drawpixel( x, y );
+         }
+      }
+   }
+   else {
+      /* draw all pixels */
+      for (i=0; i<n; i++, x++) {
+         vga_setrgbcolor( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         vga_drawpixel( x, y );
+      }
+   }
+}
+
+
+
+static void write_mono_rgba_span( const GLcontext *ctx,
+                                  GLuint n, GLint x, GLint y,
+                                  const GLubyte mask[])
+{
+   int i;
+   y=FLIP(y);
+   /* use current rgb color */
+   vga_setrgbcolor( SVGAMesa->red, SVGAMesa->green, SVGAMesa->blue );
+   for (i=0; i<n; i++, x++) {
+      if (mask[i]) {
+         vga_drawpixel( x, y );
+      }
+   }
+}
+
+
+
+/**********************************************************************/
+/*****                 Read spans of pixels                       *****/
+/**********************************************************************/
+
+
+static void read_ci32_span( const GLcontext *ctx,
+                            GLuint n, GLint x, GLint y, GLuint index[])
+{
+   int i;
+   y = FLIP(y);
+   for (i=0; i<n; i++,x++) {
+      index[i] = vga_getpixel( x, y );
+   }
+}
+
+
+
+static void read_rgba_span( const GLcontext *ctx, GLuint n, GLint x, GLint y,
+                            GLubyte rgba[][4] )
+{
+   int i;
+   for (i=0; i<n; i++, x++) {
+      /* TODO */
+   }
+}
+
+
+
+/**********************************************************************/
+/*****                  Write arrays of pixels                    *****/
+/**********************************************************************/
+
+
+static void write_ci32_pixels( 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]) {
+         vga_setcolor( index[i] );
+         vga_drawpixel( x[i], FLIP(y[i]) );
+      }
+   }
+}
+
+
+static void write_mono_ci_pixels( const GLcontext *ctx, GLuint n,
+                                  const GLint x[], const GLint y[],
+                                  const GLubyte mask[] )
+{
+   int i;
+   /* use current color index */
+   vga_setcolor( SVGAMesa->index );
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         vga_drawpixel( x[i], FLIP(y[i]) );
+      }
+   }
+}
+
+
+
+static void write_rgba_pixels( 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]) {
+         vga_setrgbcolor( rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+         vga_drawpixel( x[i], FLIP(y[i]) );
+      }
+   }
+}
+
+
+
+static void write_mono_rgba_pixels( const GLcontext *ctx,
+                                    GLuint n,
+                                    const GLint x[], const GLint y[],
+                                    const GLubyte mask[] )
+{
+   int i;
+   /* use current rgb color */
+   vga_setrgbcolor( SVGAMesa->red, SVGAMesa->green, SVGAMesa->blue );
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         vga_drawpixel( x[i], FLIP(y[i]) );
+      }
+   }
+}
+
+
+
+
+/**********************************************************************/
+/*****                   Read arrays of pixels                    *****/
+/**********************************************************************/
+
+/* Read an array of color index pixels. */
+static void read_ci32_pixels( 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] = vga_getpixel( x[i], FLIP(y[i]) );
+   }
+}
+
+
+
+static void read_rgba_pixels( const GLcontext *ctx,
+                              GLuint n, const GLint x[], const GLint y[],
+                              GLubyte rgba[][4], const GLubyte mask[] )
+{
+   /* TODO */
+}
+
+
+
+static void svgamesa_update_state( GLcontext *ctx )
+{
+   /* Initialize all the pointers in the DD struct.  Do this whenever */
+   /* a new context is made current or we change buffers via set_buffer! */
+
+   ctx->Driver.UpdateState = svgamesa_update_state;
+
+   ctx->Driver.ClearIndex = clear_index;
+   ctx->Driver.ClearColor = clear_color;
+   ctx->Driver.Clear = clear;
+
+   ctx->Driver.Index = set_index;
+   ctx->Driver.Color = set_color;
+
+   ctx->Driver.SetBuffer = set_buffer;
+   ctx->Driver.GetBufferSize = get_buffer_size;
+
+   ctx->Driver.PointsFunc = NULL;
+   ctx->Driver.LineFunc = NULL;
+   ctx->Driver.TriangleFunc = NULL;
+
+   /* Pixel/span writing functions: */
+   /* TODO: use different funcs for 8, 16, 32-bit depths */
+   ctx->Driver.WriteRGBASpan        = write_rgba_span;
+   ctx->Driver.WriteMonoRGBASpan    = write_mono_rgba_span;
+   ctx->Driver.WriteRGBAPixels      = write_rgba_pixels;
+   ctx->Driver.WriteMonoRGBAPixels  = write_mono_rgba_pixels;
+   ctx->Driver.WriteCI32Span        = write_ci32_span;
+   ctx->Driver.WriteCI8Span         = write_ci8_span;
+   ctx->Driver.WriteMonoCISpan      = write_mono_ci_span;
+   ctx->Driver.WriteCI32Pixels      = write_ci32_pixels;
+   ctx->Driver.WriteMonoCIPixels    = write_mono_ci_pixels;
+
+   /* Pixel/span reading functions: */
+   /* TODO: use different funcs for 8, 16, 32-bit depths */
+   ctx->Driver.ReadCI32Span   = read_ci32_span;
+   ctx->Driver.ReadRGBASpan   = read_rgba_span;
+   ctx->Driver.ReadCI32Pixels = read_ci32_pixels;
+   ctx->Driver.ReadRGBAPixels = read_rgba_pixels;
+}
+
+
+
+/*
+ * Create a new VGA/Mesa context and return a handle to it.
+ */
+SVGAMesaContext SVGAMesaCreateContext( GLboolean doubleBuffer )
+{
+   SVGAMesaContext ctx;
+   GLboolean rgb_flag;
+   GLfloat redscale, greenscale, bluescale, alphascale;
+   GLboolean alpha_flag = GL_FALSE;
+   int colors;
+   GLint index_bits;
+   GLint redbits, greenbits, bluebits, alphabits;
+
+   /* determine if we're in RGB or color index mode */
+   colors = vga_getcolors();
+   if (colors==32768) {
+      rgb_flag = GL_TRUE;
+      redscale = greenscale = bluescale = alphascale = 255.0;
+      redbits = greenbits = bluebits = 8;
+      alphabits = 0;
+      index_bits = 0;
+   }
+   else if (colors==256) {
+      rgb_flag = GL_FALSE;
+      redscale = greenscale = bluescale = alphascale = 0.0;
+      redbits = greenbits = bluebits = alphabits = 0;
+      index_bits = 8;
+   }
+   else {
+      printf(">16 bit color not implemented yet!\n");
+      return NULL;
+   }
+
+   ctx = (SVGAMesaContext) calloc( 1, sizeof(struct svgamesa_context) );
+   if (!ctx) {
+      return NULL;
+   }
+
+   ctx->gl_vis = gl_create_visual( rgb_flag,
+                                   alpha_flag,
+                                   doubleBuffer,
+                                   GL_FALSE,  /* stereo */
+                                   16,   /* depth_size */
+                                   8,    /* stencil_size */
+                                   16,   /* accum_size */
+                                   index_bits,
+                                   redbits, greenbits,
+                                   bluebits, alphabits );
+
+   ctx->gl_ctx = gl_create_context( ctx->gl_vis,
+                                    NULL,  /* share list context */
+                                    (void *) ctx, GL_TRUE );
+
+   ctx->gl_buffer = gl_create_framebuffer( ctx->gl_vis );
+
+   ctx->index = 1;
+   ctx->red = ctx->green = ctx->blue = 255;
+
+   ctx->width = ctx->height = 0;  /* temporary until first "make-current" */
+
+   return ctx;
+}
+
+
+
+
+/*
+ * Destroy the given VGA/Mesa context.
+ */
+void SVGAMesaDestroyContext( SVGAMesaContext ctx )
+{
+   if (ctx) {
+      gl_destroy_visual( ctx->gl_vis );
+      gl_destroy_context( ctx->gl_ctx );
+      gl_destroy_framebuffer( ctx->gl_buffer );
+      free( ctx );
+      if (ctx==SVGAMesa) {
+         SVGAMesa = NULL;
+      }
+   }
+}
+
+
+
+/*
+ * Make the specified VGA/Mesa context the current one.
+ */
+void SVGAMesaMakeCurrent( SVGAMesaContext ctx )
+{
+   SVGAMesa = ctx;
+   svgamesa_update_state( ctx->gl_ctx );
+   gl_make_current( ctx->gl_ctx, ctx->gl_buffer );
+
+   if (ctx->width==0 || ctx->height==0) {
+      /* setup initial viewport */
+      ctx->width = vga_getxdim();
+      ctx->height = vga_getydim();
+      gl_Viewport( ctx->gl_ctx, 0, 0, ctx->width, ctx->height );
+   }
+}
+
+
+
+/*
+ * Return a handle to the current VGA/Mesa context.
+ */
+SVGAMesaContext SVGAMesaGetCurrentContext( void )
+{
+   return SVGAMesa;
+}
+
+
+/*
+ * Swap front/back buffers for current context if double buffered.
+ */
+void SVGAMesaSwapBuffers( void )
+{
+   FLUSH_VB( SVGAMesa->gl_ctx, "swap buffers" );
+   if (SVGAMesa->gl_vis->DBflag) {
+      vga_flip();
+   }
+}
+
+
+#else
+
+/*
+ * Need this to provide at least one external definition when SVGA is
+ * not defined on the compiler command line.
+ */
+
+int gl_svga_dummy_function(void)
+{
+   return 0;
+}
+
+#endif  /*SVGA*/
+