xm_dd.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

         break;
      default:
         ;  /* silence compiler warning */
   }
}


static void
clear_color_HPCR_ximage( GLcontext *ctx, const GLfloat color[4] )
{
   int i;
   const XMesaContext xmesa = XMESA_CONTEXT(ctx);

   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[0], color[0]);
   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[1], color[1]);
   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[2], color[2]);
   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[3], color[3]);

   if (color[0] == 0.0 && color[1] == 0.0 && color[2] == 0.0) {
      /* black is black */
      MEMSET( xmesa->xm_visual->hpcr_clear_ximage_pattern, 0x0 ,
              sizeof(xmesa->xm_visual->hpcr_clear_ximage_pattern));
   }
   else {
      /* build clear pattern */
      for (i=0; i<16; i++) {
         xmesa->xm_visual->hpcr_clear_ximage_pattern[0][i] =
            DITHER_HPCR(i, 0,
                        xmesa->clearcolor[0],
                        xmesa->clearcolor[1],
                        xmesa->clearcolor[2]);
         xmesa->xm_visual->hpcr_clear_ximage_pattern[1][i]    =
            DITHER_HPCR(i, 1,
                        xmesa->clearcolor[0],
                        xmesa->clearcolor[1],
                        xmesa->clearcolor[2]);
      }
   }
}


static void
clear_color_HPCR_pixmap( GLcontext *ctx, const GLfloat color[4] )
{
   int i;
   const XMesaContext xmesa = XMESA_CONTEXT(ctx);

   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[0], color[0]);
   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[1], color[1]);
   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[2], color[2]);
   CLAMPED_FLOAT_TO_UBYTE(xmesa->clearcolor[3], color[3]);

   if (color[0] == 0.0 && color[1] == 0.0 && color[2] == 0.0) {
      /* black is black */
      for (i=0; i<16; i++) {
         XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 0, 0);
         XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 1, 0);
      }
   }
   else {
      for (i=0; i<16; i++) {
         XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 0,
                       DITHER_HPCR(i, 0,
                                   xmesa->clearcolor[0],
                                   xmesa->clearcolor[1],
                                   xmesa->clearcolor[2]));
         XMesaPutPixel(xmesa->xm_visual->hpcr_clear_ximage, i, 1,
                       DITHER_HPCR(i, 1,
                                   xmesa->clearcolor[0],
                                   xmesa->clearcolor[1],
                                   xmesa->clearcolor[2]));
      }
   }
   /* change tile pixmap content */
   XMesaPutImage(xmesa->display,
		 (XMesaDrawable)xmesa->xm_visual->hpcr_clear_pixmap,
		 XMESA_BUFFER(ctx->DrawBuffer)->cleargc,
		 xmesa->xm_visual->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
}


/**
 * Called when the driver should update its state, based on the new_state
 * flags.
 */
void
xmesa_update_state( GLcontext *ctx, GLbitfield new_state )
{
   const XMesaContext xmesa = XMESA_CONTEXT(ctx);

   /* Propagate statechange information to swrast and swrast_setup
    * modules.  The X11 driver has no internal GL-dependent state.
    */
   _swrast_InvalidateState( ctx, new_state );
   _tnl_InvalidateState( ctx, new_state );
   _vbo_InvalidateState( ctx, new_state );
   _swsetup_InvalidateState( ctx, new_state );

   if (ctx->DrawBuffer->Name != 0)
      return;

   /*
    * GL_DITHER, GL_READ/DRAW_BUFFER, buffer binding state, etc. effect
    * renderbuffer span/clear funcs.
    */
   if (new_state & (_NEW_COLOR | _NEW_PIXEL | _NEW_BUFFERS)) {
      XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
      struct xmesa_renderbuffer *front_xrb, *back_xrb;

      front_xrb = xmbuf->frontxrb;
      if (front_xrb) {
         xmesa_set_renderbuffer_funcs(front_xrb, xmesa->pixelformat,
                                      xmesa->xm_visual->BitsPerPixel);
         front_xrb->clearFunc = clear_pixmap;
      }

      back_xrb = xmbuf->backxrb;
      if (back_xrb) {
         xmesa_set_renderbuffer_funcs(back_xrb, xmesa->pixelformat,
                                      xmesa->xm_visual->BitsPerPixel);
         if (xmbuf->backxrb->pixmap) {
            back_xrb->clearFunc = clear_pixmap;
         }
         else {
            switch (xmesa->xm_visual->BitsPerPixel) {
            case 8:
               if (xmesa->xm_visual->hpcr_clear_flag) {
                  back_xrb->clearFunc = clear_HPCR_ximage;
               }
               else {
                  back_xrb->clearFunc = clear_8bit_ximage;
               }
               break;
            case 16:
               back_xrb->clearFunc = clear_16bit_ximage;
               break;
            case 24:
               back_xrb->clearFunc = clear_24bit_ximage;
               break;
            case 32:
               back_xrb->clearFunc = clear_32bit_ximage;
               break;
            default:
               back_xrb->clearFunc = clear_nbit_ximage;
               break;
            }
         }
      }
   }

   if (xmesa->xm_visual->hpcr_clear_flag) {
      /* this depends on whether we're drawing to the front or back buffer */
      /* XXX FIX THIS! */
#if 0
      if (pixmap) {
         ctx->Driver.ClearColor = clear_color_HPCR_pixmap;
      }
      else {
         ctx->Driver.ClearColor = clear_color_HPCR_ximage;
      }
#else
      (void) clear_color_HPCR_pixmap;
      (void) clear_color_HPCR_ximage;
#endif
   }
}



/**
 * Called via ctx->Driver.TestProxyTeximage().  Normally, we'd just use
 * the _mesa_test_proxy_teximage() fallback function, but we're going to
 * special-case the 3D texture case to allow textures up to 512x512x32
 * texels.
 */
static GLboolean
test_proxy_teximage(GLcontext *ctx, GLenum target, GLint level,
                    GLint internalFormat, GLenum format, GLenum type,
                    GLint width, GLint height, GLint depth, GLint border)
{
   if (target == GL_PROXY_TEXTURE_3D) {
      /* special case for 3D textures */
      if (width * height * depth > 512 * 512 * 64 ||
          width  < 2 * border ||
          (!ctx->Extensions.ARB_texture_non_power_of_two &&
           _mesa_bitcount(width  - 2 * border) != 1) ||
          height < 2 * border ||
          (!ctx->Extensions.ARB_texture_non_power_of_two &&
           _mesa_bitcount(height - 2 * border) != 1) ||
          depth  < 2 * border ||
          (!ctx->Extensions.ARB_texture_non_power_of_two &&
           _mesa_bitcount(depth  - 2 * border) != 1)) {
         /* Bad size, or too many texels */
         return GL_FALSE;
      }
      return GL_TRUE;
   }
   else {
      /* use the fallback routine for 1D, 2D, cube and rect targets */
      return _mesa_test_proxy_teximage(ctx, target, level, internalFormat,
                                       format, type, width, height, depth,
                                       border);
   }
}


/**
 * In SW, we don't really compress GL_COMPRESSED_RGB[A] textures!
 */
static const struct gl_texture_format *
choose_tex_format( GLcontext *ctx, GLint internalFormat,
                   GLenum format, GLenum type )
{
   switch (internalFormat) {
      case GL_COMPRESSED_RGB_ARB:
         return &_mesa_texformat_rgb;
      case GL_COMPRESSED_RGBA_ARB:
         return &_mesa_texformat_rgba;
      default:
         return _mesa_choose_tex_format(ctx, internalFormat, format, type);
   }
}


/**
 * Called by glViewport.
 * This is a good time for us to poll the current X window size and adjust
 * our renderbuffers to match the current window size.
 * Remember, we have no opportunity to respond to conventional
 * X Resize/StructureNotify events since the X driver has no event loop.
 * Thus, we poll.
 * Note that this trick isn't fool-proof.  If the application never calls
 * glViewport, our notion of the current window size may be incorrect.
 * That problem led to the GLX_MESA_resize_buffers extension.
 */
static void
xmesa_viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
{
   XMesaContext xmctx = XMESA_CONTEXT(ctx);
   XMesaBuffer xmdrawbuf = XMESA_BUFFER(ctx->WinSysDrawBuffer);
   XMesaBuffer xmreadbuf = XMESA_BUFFER(ctx->WinSysReadBuffer);
   xmesa_check_and_update_buffer_size(xmctx, xmdrawbuf);
   xmesa_check_and_update_buffer_size(xmctx, xmreadbuf);
   (void) x;
   (void) y;
   (void) w;
   (void) h;
}


#if ENABLE_EXT_timer_query

/*
 * The GL_EXT_timer_query extension is not enabled for the XServer
 * indirect renderer.  Not sure about how/if wrapping of gettimeofday()
 * is done, etc.
 */

struct xmesa_query_object
{
   struct gl_query_object Base;
   struct timeval StartTime;
};


static struct gl_query_object *
xmesa_new_query_object(GLcontext *ctx, GLuint id)
{
   struct xmesa_query_object *q = CALLOC_STRUCT(xmesa_query_object);
   if (q) {
      q->Base.Id = id;
      q->Base.Ready = GL_TRUE;
   }
   return &q->Base;
}


static void
xmesa_begin_query(GLcontext *ctx, GLenum target, struct gl_query_object *q)
{
   if (target == GL_TIME_ELAPSED_EXT) {
      struct xmesa_query_object *xq = (struct xmesa_query_object *) q;
      (void) gettimeofday(&xq->StartTime, NULL);
   }
}


/**
 * Return the difference between the two given times in microseconds.
 */
#ifdef __VMS
#define suseconds_t unsigned int
#endif
static GLuint64EXT
time_diff(const struct timeval *t0, const struct timeval *t1)
{
   GLuint64EXT seconds0 = t0->tv_sec & 0xff;  /* 0 .. 255 seconds */
   GLuint64EXT seconds1 = t1->tv_sec & 0xff;  /* 0 .. 255 seconds */
   GLuint64EXT nanosec0 = (seconds0 * 1000000 + t0->tv_usec) * 1000;
   GLuint64EXT nanosec1 = (seconds1 * 1000000 + t1->tv_usec) * 1000;
   return nanosec1 - nanosec0;
}


static void
xmesa_end_query(GLcontext *ctx, GLenum target, struct gl_query_object *q)
{
   if (target == GL_TIME_ELAPSED_EXT) {
      struct xmesa_query_object *xq = (struct xmesa_query_object *) q;
      struct timeval endTime;
      (void) gettimeofday(&endTime, NULL);
      /* result is in nanoseconds! */
      q->Result = time_diff(&xq->StartTime, &endTime);
   }
   q->Ready = GL_TRUE;
}

#endif /* ENABLE_timer_query */


/**
 * Initialize the device driver function table with the functions
 * we implement in this driver.
 */
void
xmesa_init_driver_functions( XMesaVisual xmvisual,
                             struct dd_function_table *driver )
{
   driver->GetString = get_string;
   driver->UpdateState = xmesa_update_state;
   driver->GetBufferSize = NULL; /* OBSOLETE */
   driver->Flush = finish_or_flush;
   driver->Finish = finish_or_flush;
   driver->ClearIndex = clear_index;
   driver->ClearColor = clear_color;
   driver->IndexMask = index_mask;
   driver->ColorMask = color_mask;
   driver->Enable = enable;
   driver->Clear = clear_buffers;
   driver->Viewport = xmesa_viewport;
#ifndef XFree86Server
   driver->CopyPixels = xmesa_CopyPixels;
   if (xmvisual->undithered_pf == PF_8R8G8B &&
       xmvisual->dithered_pf == PF_8R8G8B &&
       xmvisual->BitsPerPixel == 32) {
      driver->DrawPixels = xmesa_DrawPixels_8R8G8B;
   }
   else if (xmvisual->undithered_pf == PF_5R6G5B) {
      driver->DrawPixels = xmesa_DrawPixels_5R6G5B;
   }
#endif
   driver->TestProxyTexImage = test_proxy_teximage;
#if ENABLE_EXT_texure_compression_s3tc
   driver->ChooseTextureFormat = choose_tex_format;
#else
   (void) choose_tex_format;
#endif

#if ENABLE_EXT_timer_query
   driver->NewQueryObject = xmesa_new_query_object;
   driver->BeginQuery = xmesa_begin_query;
   driver->EndQuery = xmesa_end_query;
#endif
}


#define XMESA_NEW_POINT  (_NEW_POINT | \
                          _NEW_RENDERMODE | \
                          _SWRAST_NEW_RASTERMASK)

#define XMESA_NEW_LINE   (_NEW_LINE | \
                          _NEW_TEXTURE | \
                          _NEW_LIGHT | \
                          _NEW_DEPTH | \
                          _NEW_RENDERMODE | \
                          _SWRAST_NEW_RASTERMASK)

#define XMESA_NEW_TRIANGLE (_NEW_POLYGON | \
                            _NEW_TEXTURE | \
                            _NEW_LIGHT | \
                            _NEW_DEPTH | \
                            _NEW_RENDERMODE | \
                            _SWRAST_NEW_RASTERMASK)


/**
 * Extend the software rasterizer with our line/point/triangle
 * functions.
 * Called during context creation only.
 */
void xmesa_register_swrast_functions( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT( ctx );

   swrast->choose_point = xmesa_choose_point;
   swrast->choose_line = xmesa_choose_line;
   swrast->choose_triangle = xmesa_choose_triangle;

   /* XXX these lines have no net effect.  Remove??? */
   swrast->InvalidatePointMask |= XMESA_NEW_POINT;
   swrast->InvalidateLineMask |= XMESA_NEW_LINE;
   swrast->InvalidateTriangleMask |= XMESA_NEW_TRIANGLE;
}