DOS updates from Daniel Borca

1 files changed, 90 insertions, 101 deletions

diff --git a/src/mesa/drivers/dos/dmesa.c b/src/mesa/drivers/dos/dmesa.c
index d3d3d4abcb..a389e3d339 100644
--- a/src/mesa/drivers/dos/dmesa.c
+++ b/src/mesa/drivers/dos/dmesa.c
@@ -1,8 +1,8 @@
 /*

  * Mesa 3-D graphics library

- * Version:  5.0

+ * Version:  5.0.1

  * 

- * Copyright (C) 1999  Brian Paul   All Rights Reserved.

+ * Copyright (C) 1999-2003  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"),

@@ -25,17 +25,15 @@
 /*

  * DOS/DJGPP device driver v1.3 for Mesa

  *

- *  Copyright (C) 2002 - Borca Daniel

+ *  Copyright (c) 2003 - Borca Daniel

  *  Email : dborca@yahoo.com

  *  Web   : http://www.geocities.com/dborca

  */

 

 

 #ifndef FX

-

 #include "glheader.h"

 #include "context.h"

-#include "GL/dmesa.h"

 #include "extensions.h"

 #include "macros.h"

 #include "matrix.h"

@@ -53,24 +51,17 @@
 #include "tnl/tnl.h"

 #include "tnl/t_context.h"

 #include "tnl/t_pipeline.h"

-

 #ifndef MATROX

-

 #include "video.h"

-

 #else  /* MATROX */

-

 #include "mga/mga.h"

-

 #endif /* MATROX */

-

 #else  /* FX */

-

 #include "../FX/fxdrv.h"

-#include "GL/dmesa.h"

-

 #endif /* FX */

 

+#include "GL/dmesa.h"

+

 

 

 /*

@@ -78,7 +69,7 @@
  * Add system-specific fields to it.

  */

 struct dmesa_visual {

-   GLvisual *gl_visual;

+   GLvisual gl_visual;

    GLboolean db_flag;           /* double buffered? */

    GLboolean rgb_flag;          /* RGB mode? */

    GLuint depth;                /* bits per pixel (1, 8, 24, etc) */

@@ -105,7 +96,7 @@ struct dmesa_buffer {
  * Add system-specific fields to it.

  */

 struct dmesa_context {

-   GLcontext *gl_ctx;           /* the core library context */

+   GLcontext gl_ctx;            /* the core library context */

    DMesaVisual visual;

    DMesaBuffer Buffer;

    GLuint ClearColor;

@@ -141,7 +132,7 @@ struct dmesa_context {
 static void write_rgba_span (const GLcontext *ctx, GLuint n, GLint x, GLint y,

                              const GLubyte rgba[][4], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

 #ifndef MATROX

@@ -189,7 +180,7 @@ static void write_rgba_span (const GLcontext *ctx, GLuint n, GLint x, GLint y,
 static void write_rgb_span (const GLcontext *ctx, GLuint n, GLint x, GLint y,

                             const GLubyte rgb[][3], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -214,7 +205,7 @@ static void write_mono_rgba_span (const GLcontext *ctx,
                                   GLuint n, GLint x, GLint y,

                                   const GLchan color[4], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset, rgba = vl_mixrgba(color);

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -238,7 +229,7 @@ static void write_mono_rgba_span (const GLcontext *ctx,
 static void read_rgba_span (const GLcontext *ctx, GLuint n, GLint x, GLint y,

                             GLubyte rgba[][4])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -254,7 +245,7 @@ static void write_rgba_pixels (const GLcontext *ctx,
                                GLuint n, const GLint x[], const GLint y[],

                                const GLubyte rgba[][4], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, _w_ = DSTRIDE, _b_ = dmesa->Buffer->height - 1;

 

  if (mask) {

@@ -278,7 +269,7 @@ static void write_mono_rgba_pixels (const GLcontext *ctx,
                                     GLuint n, const GLint x[], const GLint y[],

                                     const GLchan color[4], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, _w_ = DSTRIDE, _b_ = dmesa->Buffer->height - 1, rgba = vl_mixrgba(color);

 

  if (mask) {

@@ -302,7 +293,7 @@ static void read_rgba_pixels (const GLcontext *ctx,
                               GLuint n, const GLint x[], const GLint y[],

                               GLubyte rgba[][4], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, _w_ = DSTRIDE, _b_ = dmesa->Buffer->height - 1;

 

  if (mask) {

@@ -329,7 +320,7 @@ static void read_rgba_pixels (const GLcontext *ctx,
 static void write_index_span (const GLcontext *ctx, GLuint n, GLint x, GLint y,

                               const GLuint index[], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -353,7 +344,7 @@ static void write_index_span (const GLcontext *ctx, GLuint n, GLint x, GLint y,
 static void write_index8_span (const GLcontext *ctx, GLuint n, GLint x, GLint y,

                                const GLubyte index[], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -378,7 +369,7 @@ static void write_mono_index_span (const GLcontext *ctx,
                                    GLuint n, GLint x, GLint y,

                                    GLuint colorIndex, const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -402,7 +393,7 @@ static void write_mono_index_span (const GLcontext *ctx,
 static void read_index_span (const GLcontext *ctx, GLuint n, GLint x, GLint y,

                              GLuint index[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -418,7 +409,7 @@ static void write_index_pixels (const GLcontext *ctx,
                                 GLuint n, const GLint x[], const GLint y[],

                                 const GLuint index[], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, _w_ = DSTRIDE, _b_ = dmesa->Buffer->height - 1;

 

  if (mask) {

@@ -442,7 +433,7 @@ static void write_mono_index_pixels (const GLcontext *ctx,
                                      GLuint n, const GLint x[], const GLint y[],

                                      GLuint colorIndex, const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, _w_ = DSTRIDE, _b_ = dmesa->Buffer->height - 1;

 

  if (mask) {

@@ -466,7 +457,7 @@ static void read_index_pixels (const GLcontext *ctx,
                                GLuint n, const GLint x[], const GLint y[],

                                GLuint index[], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, _w_ = DSTRIDE, _b_ = dmesa->Buffer->height - 1;

 

  if (mask) {

@@ -494,7 +485,7 @@ static void read_index_pixels (const GLcontext *ctx,
 static void write_depth_span (GLcontext *ctx, GLuint n, GLint x, GLint y,

                               const GLdepth depth[], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -518,7 +509,7 @@ static void write_depth_span (GLcontext *ctx, GLuint n, GLint x, GLint y,
 static void read_depth_span (GLcontext *ctx, GLuint n, GLint x, GLint y,

                              GLdepth depth[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, offset;

 

  offset = DSTRIDE * FLIP(y) + x;

@@ -534,7 +525,7 @@ static void write_depth_pixels (GLcontext *ctx, GLuint n,
                                 const GLint x[], const GLint y[],

                                 const GLdepth depth[], const GLubyte mask[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, _w_ = DSTRIDE, _b_ = dmesa->Buffer->height - 1;

 

  if (mask) {

@@ -558,7 +549,7 @@ static void read_depth_pixels (GLcontext *ctx, GLuint n,
                                const GLint x[], const GLint y[],

                                GLdepth depth[])

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint i, _w_ = DSTRIDE, _b_ = dmesa->Buffer->height - 1;

 

  /* read all values */

@@ -582,7 +573,7 @@ static void tri_rgb_flat (GLcontext *ctx,
                           const SWvertex *v1,

                           const SWvertex *v2)

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint _b_ = dmesa->Buffer->height - 1;

 #ifndef MATROX

  GLuint _w_ = dmesa->Buffer->width;

@@ -619,7 +610,7 @@ static void tri_rgb_flat_zless (GLcontext *ctx,
                                 const SWvertex *v1,

                                 const SWvertex *v2)

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint _b_ = dmesa->Buffer->height - 1;

 #ifndef MATROX

  GLuint _w_ = dmesa->Buffer->width;

@@ -666,7 +657,7 @@ static void tri_rgb_iter (GLcontext *ctx,
                           const SWvertex *v1,

                           const SWvertex *v2)

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint _b_ = dmesa->Buffer->height - 1;

 #ifndef MATROX

  GLuint _w_ = dmesa->Buffer->width;

@@ -707,7 +698,7 @@ static void tri_rgb_iter_zless (GLcontext *ctx,
                                 const SWvertex *v1,

                                 const SWvertex *v2)

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint _b_ = dmesa->Buffer->height - 1;

 #ifndef MATROX

  GLuint _w_ = dmesa->Buffer->width;

@@ -839,7 +830,7 @@ static void line_rgb_flat (GLcontext *ctx,
                            const SWvertex *vert0,

                            const SWvertex *vert1)

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint _b_ = dmesa->Buffer->height - 1;

 #ifndef MATROX

  GLuint _w_ = dmesa->Buffer->width;

@@ -867,7 +858,7 @@ static void line_rgb_flat_zless (GLcontext *ctx,
                                  const SWvertex *vert0,

                                  const SWvertex *vert1)

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint _b_ = dmesa->Buffer->height - 1;

 #ifndef MATROX

  GLuint _w_ = dmesa->Buffer->width;

@@ -907,7 +898,7 @@ static void line_rgb_iter (GLcontext *ctx,
                            const SWvertex *vert0,

                            const SWvertex *vert1)

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint _b_ = dmesa->Buffer->height - 1;

  MGAvertex m0, m1;

  matrox_line_clip_hack(ctx, _b_, &m0, vert0, &m1, vert1);

@@ -925,7 +916,7 @@ static void line_rgb_iter_zless (GLcontext *ctx,
                                  const SWvertex *vert0,

                                  const SWvertex *vert1)

 {

- const DMesaContext dmesa = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext dmesa = (DMesaContext)ctx;

  GLuint _b_ = dmesa->Buffer->height - 1;

  MGAvertex m0, m1;

  matrox_line_clip_hack(ctx, _b_, &m0, vert0, &m1, vert1);

@@ -992,7 +983,7 @@ static void dmesa_choose_line (GLcontext *ctx)
 

 static void clear_index (GLcontext *ctx, GLuint index)

 {

- ((DMesaContext)ctx->DriverCtx)->ClearIndex = index;

+ ((DMesaContext)ctx)->ClearIndex = index;

 }

 

 static void clear_color (GLcontext *ctx, const GLfloat color[4])

@@ -1002,7 +993,7 @@ static void clear_color (GLcontext *ctx, const GLfloat color[4])
  CLAMPED_FLOAT_TO_UBYTE(col[1], color[1]);

  CLAMPED_FLOAT_TO_UBYTE(col[2], color[2]);

  CLAMPED_FLOAT_TO_UBYTE(col[3], color[3]);

- ((DMesaContext)ctx->DriverCtx)->ClearColor = vl_mixrgba(col);

+ ((DMesaContext)ctx)->ClearColor = vl_mixrgba(col);

 }

 

 

@@ -1010,7 +1001,7 @@ static void clear_color (GLcontext *ctx, const GLfloat color[4])
 static void clear (GLcontext *ctx, GLbitfield mask, GLboolean all,

                    GLint x, GLint y, GLint width, GLint height)

 {

- const DMesaContext c = (DMesaContext)ctx->DriverCtx;

+ const DMesaContext c = (DMesaContext)ctx;

  const GLuint *colorMask = (GLuint *)&ctx->Color.ColorMask;

 

 /*

@@ -1234,7 +1225,7 @@ static void dmesa_init_pointers (GLcontext *ctx)
   * pretty sure they will never change during the life of the Visual

   */

 #ifdef MATROX

- if (((DMesaContext)ctx->DriverCtx)->visual->zbuffer == -1) {

+ if (((DMesaContext)ctx)->visual->zbuffer == -1) {

     /* Depth span/pixel functions */

     dd->WriteDepthSpan = write_depth_span;

     dd->WriteDepthPixels = write_depth_pixels;

@@ -1363,23 +1354,24 @@ DMesaVisual DMesaCreateVisual (GLint width,
     alphaBits = 8;

  }

 

- if ((v=(DMesaVisual)calloc(1, sizeof(struct dmesa_visual))) != NULL) {

+ if ((v=(DMesaVisual)CALLOC_STRUCT(dmesa_visual)) != NULL) {

     /* Create core visual */

-    v->gl_visual = _mesa_create_visual(rgbFlag,			/* rgb */

-                                       dbFlag,

-                                       GL_FALSE,		/* stereo */

-                                       redBits,

-                                       greenBits,

-                                       blueBits,

-                                       alphaBits,

-                                       indexBits,		/* indexBits */

-                                       depthSize,

-                                       stencilSize,

-                                       accumSize,		/* accumRed */

-                                       accumSize,		/* accumGreen */

-                                       accumSize,		/* accumBlue */

-                                       alphaFlag?accumSize:0,	/* accumAlpha */

-                                       1);			/* numSamples */

+    _mesa_initialize_visual((GLvisual *)v,

+                            rgbFlag,		/* rgb */

+                            dbFlag,

+                            GL_FALSE,		/* stereo */

+                            redBits,

+                            greenBits,

+                            blueBits,

+                            alphaBits,

+                            indexBits,		/* indexBits */

+                            depthSize,

+                            stencilSize,

+                            accumSize,		/* accumRed */

+                            accumSize,		/* accumGreen */

+                            accumSize,		/* accumBlue */

+                            alphaFlag?accumSize:0,	/* accumAlpha */

+                            1);			/* numSamples */

 

     v->depth = colDepth;

     v->db_flag = dbFlag;

@@ -1420,8 +1412,7 @@ DMesaVisual DMesaCreateVisual (GLint width,
 void DMesaDestroyVisual (DMesaVisual v)

 {

 #ifndef FX

- _mesa_destroy_visual(v->gl_visual);

- free(v);

+ _mesa_destroy_visual((GLvisual *)v);

 

 #ifndef MATROX

  vl_video_exit();

@@ -1443,14 +1434,13 @@ DMesaBuffer DMesaCreateBuffer (DMesaVisual visual,
 #ifndef FX

  DMesaBuffer b;

 

- if ((b=(DMesaBuffer)calloc(1, sizeof(struct dmesa_buffer))) != NULL) {

-

-    _mesa_initialize_framebuffer(&b->gl_buffer,

-                                 visual->gl_visual,

+ if ((b=(DMesaBuffer)CALLOC_STRUCT(dmesa_buffer)) != NULL) {

+    _mesa_initialize_framebuffer((GLframebuffer *)b,

+                                 (GLvisual *)visual,

                                  visual->zbuffer == 1,

-                                 visual->gl_visual->stencilBits > 0,

-                                 visual->gl_visual->accumRedBits > 0,

-                                 visual->gl_visual->alphaBits > 0);

+                                 ((GLvisual *)visual)->stencilBits > 0,

+                                 ((GLvisual *)visual)->accumRedBits > 0,

+                                 ((GLvisual *)visual)->alphaBits > 0);

     b->xpos = xpos;

     b->ypos = ypos;

     b->width = width;

@@ -1471,8 +1461,7 @@ void DMesaDestroyBuffer (DMesaBuffer b)
 #ifndef MATROX

  free(b->the_window);

 #endif

- _mesa_free_framebuffer_data(&b->gl_buffer);

- free(b);

+ _mesa_destroy_framebuffer((GLframebuffer *)b);

 #endif

 }

 

@@ -1485,28 +1474,29 @@ DMesaContext DMesaCreateContext (DMesaVisual visual,
  DMesaContext c;

  GLboolean direct = GL_FALSE;

 

- if ((c=(DMesaContext)calloc(1, sizeof(struct dmesa_context))) != NULL) {

-    c->gl_ctx = _mesa_create_context(visual->gl_visual,

-                                     share ? share->gl_ctx : NULL,

-                                     (void *)c, direct);

+ if ((c=(DMesaContext)CALLOC_STRUCT(dmesa_context)) != NULL) {

+    _mesa_initialize_context((GLcontext *)c,

+                             (GLvisual *)visual,

+                             (GLcontext *)share,

+                             (void *)c, direct);

 

-    _mesa_enable_sw_extensions(c->gl_ctx);

-    _mesa_enable_1_3_extensions(c->gl_ctx);

-    _mesa_enable_1_4_extensions(c->gl_ctx);

+    _mesa_enable_sw_extensions((GLcontext *)c);

+    _mesa_enable_1_3_extensions((GLcontext *)c);

+    _mesa_enable_1_4_extensions((GLcontext *)c);

 

     /* you probably have to do a bunch of other initializations here. */

     c->visual = visual;

 

-    c->gl_ctx->Driver.UpdateState = dmesa_update_state;

+    ((GLcontext *)c)->Driver.UpdateState = dmesa_update_state;

 

     /* Initialize the software rasterizer and helper modules.

      */

-    _swrast_CreateContext(c->gl_ctx);

-    _ac_CreateContext(c->gl_ctx);

-    _tnl_CreateContext(c->gl_ctx);

-    _swsetup_CreateContext(c->gl_ctx);

-    if (visual->rgb_flag) dmesa_register_swrast_functions(c->gl_ctx);

-    dmesa_init_pointers(c->gl_ctx);

+    _swrast_CreateContext((GLcontext *)c);

+    _ac_CreateContext((GLcontext *)c);

+    _tnl_CreateContext((GLcontext *)c);

+    _swsetup_CreateContext((GLcontext *)c);

+    if (visual->rgb_flag) dmesa_register_swrast_functions((GLcontext *)c);

+    dmesa_init_pointers((GLcontext *)c);

  }

 

  return c;

@@ -1521,14 +1511,13 @@ DMesaContext DMesaCreateContext (DMesaVisual visual,
 void DMesaDestroyContext (DMesaContext c)

 {

 #ifndef FX

- if (c->gl_ctx) {

-    _swsetup_DestroyContext(c->gl_ctx);

-    _swrast_DestroyContext(c->gl_ctx);

-    _tnl_DestroyContext(c->gl_ctx);

-    _ac_DestroyContext(c->gl_ctx);

-    _mesa_destroy_context(c->gl_ctx);

+ if (c) {

+    _swsetup_DestroyContext((GLcontext *)c);

+    _swrast_DestroyContext((GLcontext *)c);

+    _tnl_DestroyContext((GLcontext *)c);

+    _ac_DestroyContext((GLcontext *)c);

+    _mesa_destroy_context((GLcontext *)c);

  }

- free(c);

 #endif

 }

 

@@ -1538,7 +1527,7 @@ GLboolean DMesaMoveBuffer (GLint xpos, GLint ypos)
 {

 #if !defined(FX) && !defined(MATROX)

  GET_CURRENT_CONTEXT(ctx);

- DMesaBuffer b = ((DMesaContext)ctx->DriverCtx)->Buffer;

+ DMesaBuffer b = ((DMesaContext)ctx)->Buffer;

 

  if (vl_sync_buffer(&b->the_window, xpos, ypos, b->width, b->height) != 0) {

     return GL_FALSE;

@@ -1559,7 +1548,7 @@ GLboolean DMesaResizeBuffer (GLint width, GLint height)
 {

 #if !defined(FX) && !defined(MATROX)

  GET_CURRENT_CONTEXT(ctx);

- DMesaBuffer b = ((DMesaContext)ctx->DriverCtx)->Buffer;

+ DMesaBuffer b = ((DMesaContext)ctx)->Buffer;

 

  if (vl_sync_buffer(&b->the_window, b->xpos, b->ypos, width, height) != 0) {

     return GL_FALSE;

@@ -1591,8 +1580,8 @@ GLboolean DMesaMakeCurrent (DMesaContext c, DMesaBuffer b)
 

     c->Buffer = b;

 

-    _mesa_make_current(c->gl_ctx, &b->gl_buffer);

-    if (c->gl_ctx->Viewport.Width == 0) {

+    _mesa_make_current((GLcontext *)c, (GLframebuffer *)b);

+    if (((GLcontext *)c)->Viewport.Width == 0) {

        /* initialize viewport to window size */

        _mesa_Viewport(0, 0, b->width, b->height);

     }

@@ -1619,7 +1608,7 @@ void DMesaSwapBuffers (DMesaBuffer b)
 #ifndef MATROX

  vl_flip();

 #else

- if (((DMesaContext)ctx->DriverCtx)->visual->db_flag) {

+ if (((DMesaContext)ctx)->visual->db_flag) {

     mga_swapbuffers(1);

  }

 #endif

@@ -1643,7 +1632,7 @@ DMesaContext DMesaGetCurrentContext (void)
 {

 #ifndef FX

  GET_CURRENT_CONTEXT(ctx);

- return (ctx == NULL) ? NULL : (DMesaContext)ctx->DriverCtx;

+ return (DMesaContext)ctx;

 #else

  return (DMesaContext)fxMesaGetCurrentContext();

 #endif

@@ -1655,7 +1644,7 @@ int DMesaGetIntegerv (GLenum pname, GLint *params)
 {

 #ifndef FX

  GET_CURRENT_CONTEXT(ctx);

- const DMesaContext c = (ctx == NULL) ? NULL : (DMesaContext)ctx->DriverCtx;

+ const DMesaContext c = (DMesaContext)ctx;

 #else

  const fxMesaContext c = fxMesaGetCurrentContext();

 #endif