xm_dd.c

mesa-6.5-minigui源码

         GLint j;
         for (j=0;j<height;j++) {
            bgr_t *ptr3 = PIXEL_ADDR3(xrb, x, y + j);
            MEMSET(ptr3, r, 3 * width);
         }
      }
      else {
         /* non-gray clear color */
         GLint i, j;
         for (j = 0; j < height; j++) {
            bgr_t *ptr3 = PIXEL_ADDR3(xrb, x, y + j);
            for (i = 0; i < width; i++) {
               ptr3->r = r;
               ptr3->g = g;
               ptr3->b = b;
               ptr3++;
            }
         }
      }
   }
}


static void
clear_32bit_ximage(GLcontext *ctx, struct xmesa_renderbuffer *xrb,
                   GLboolean all, GLint x, GLint y, GLint width, GLint height)
{
   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
   register GLuint pixel = (GLuint) xmesa->clearpixel;

   if (!xrb->ximage)
      return;

   if (xmesa->swapbytes) {
      pixel = ((pixel >> 24) & 0x000000ff)
            | ((pixel >> 8)  & 0x0000ff00)
            | ((pixel << 8)  & 0x00ff0000)
            | ((pixel << 24) & 0xff000000);
   }

   if (all) {
      const GLuint n = xrb->Base.Width * xrb->Base.Height;
      GLuint *ptr4 = (GLuint *) xrb->ximage->data;
      if (pixel == 0) {
         _mesa_memset(ptr4, pixel, 4 * n);
      }
      else {
         GLuint i;
         for (i = 0; i < n; i++)
            ptr4[i] = pixel;
      }
   }
   else {
      GLint i, j;
      for (j = 0; j < height; j++) {
         GLuint *ptr4 = PIXEL_ADDR4(xrb, x, y + j);
         for (i = 0; i < width; i++) {
            ptr4[i] = pixel;
         }
      }
   }
}


static void
clear_nbit_ximage(GLcontext *ctx, struct xmesa_renderbuffer *xrb,
                  GLboolean all, GLint x, GLint y, GLint width, GLint height)
{
   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
   XMesaImage *img = xrb->ximage;
   GLint i, j;

   /* We can ignore 'all' here - x, y, width, height are always right */
   (void) all;

   /* TODO: optimize this */
   y = YFLIP(xrb, y);
   for (j = 0; j < height; j++) {
      for (i = 0; i < width; i++) {
         XMesaPutPixel(img, x+i, y-j, xmesa->clearpixel);
      }
   }
}



static void
clear_buffers( GLcontext *ctx, GLbitfield mask,
               GLboolean all, GLint x, GLint y, GLint width, GLint height )
{
   if (ctx->DrawBuffer->Name == 0) {
      /* this is a window system framebuffer */
      const GLuint *colorMask = (GLuint *) &ctx->Color.ColorMask;
      XMesaBuffer b = (XMesaBuffer) ctx->DrawBuffer;

      /* we can't handle color or index masking */
      if (*colorMask == 0xffffffff && ctx->Color.IndexMask == 0xffffffff) {
         if (mask & BUFFER_BIT_FRONT_LEFT) {
            /* clear front color buffer */
            if (b->frontxrb == (struct xmesa_renderbuffer *)
                ctx->DrawBuffer->Attachment[BUFFER_FRONT_LEFT].Renderbuffer) {
               /* renderbuffer is not wrapped - great! */
               b->frontxrb->clearFunc(ctx, b->frontxrb, all, x, y,
                                      width, height);
               mask &= ~BUFFER_BIT_FRONT_LEFT;
            }
            else {
               /* we can't directly clear an alpha-wrapped color buffer */
            }
         }
         if (mask & BUFFER_BIT_BACK_LEFT) {
            /* clear back color buffer */
            if (b->backxrb == (struct xmesa_renderbuffer *)
                ctx->DrawBuffer->Attachment[BUFFER_BACK_LEFT].Renderbuffer) {
               /* renderbuffer is not wrapped - great! */
               b->backxrb->clearFunc(ctx, b->backxrb, all, x, y,
                                     width, height);
               mask &= ~BUFFER_BIT_BACK_LEFT;
            }
         }
      }
   }
   if (mask)
      _swrast_Clear( ctx, mask, all, x, y, width, height );
}


/**
 * Called by ctx->Driver.ResizeBuffers()
 * Resize the front/back colorbuffers to match the latest window size.
 */
void
xmesa_resize_buffers(GLcontext *ctx, GLframebuffer *buffer,
                     GLuint width, GLuint height)
{
   /* We can do this cast because the first field in the XMesaBuffer
    * struct is a GLframebuffer struct.  If this weren't true, we'd
    * need a pointer from the GLframebuffer to the XMesaBuffer.
    */
   XMesaBuffer xmBuffer = (XMesaBuffer) buffer;

   xmesa_alloc_back_buffer(xmBuffer, width, height);

   _mesa_resize_framebuffer(ctx, buffer, width, height);
}


#ifndef XFree86Server
/* XXX this was never tested in the Xserver environment */

/**
 * This function implements glDrawPixels() with an XPutImage call when
 * drawing to the front buffer (X Window drawable).
 * The image format must be GL_BGRA to match the PF_8R8G8B pixel format.
 */
static void
xmesa_DrawPixels_8R8G8B( GLcontext *ctx,
                         GLint x, GLint y, GLsizei width, GLsizei height,
                         GLenum format, GLenum type,
                         const struct gl_pixelstore_attrib *unpack,
                         const GLvoid *pixels )
{
   struct xmesa_renderbuffer *xrb
      = (struct xmesa_renderbuffer *) ctx->DrawBuffer->_ColorDrawBuffers[0][0];

   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
   const SWcontext *swrast = SWRAST_CONTEXT( ctx );
   XMesaDisplay *dpy = xmesa->xm_visual->display;
   XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
   const XMesaGC gc = xmbuf->gc;

   ASSERT(dpy);
   ASSERT(gc);
   ASSERT(xmesa->xm_visual->dithered_pf == PF_8R8G8B);
   ASSERT(xmesa->xm_visual->undithered_pf == PF_8R8G8B);

   if (swrast->NewState)
      _swrast_validate_derived( ctx );

   if (xrb->pixmap &&
       format == GL_BGRA &&
       type == GL_UNSIGNED_BYTE &&
       (swrast->_RasterMask & ~CLIP_BIT) == 0 && /* no blend, z-test, etc */
       ctx->_ImageTransferState == 0 &&  /* no color tables, scale/bias, etc */
       ctx->Pixel.ZoomX == 1.0 &&        /* no zooming */
       ctx->Pixel.ZoomY == 1.0) {
      int dstX = x;
      int dstY = y;
      int w = width;
      int h = height;
      struct gl_pixelstore_attrib clippedUnpack = *unpack;

      if (unpack->BufferObj->Name) {
         /* unpack from PBO */
         GLubyte *buf;
         if (!_mesa_validate_pbo_access(2, unpack, width, height, 1,
                                        format, type, pixels)) {
            _mesa_error(ctx, GL_INVALID_OPERATION,
                        "glDrawPixels(invalid PBO access)");
            return;
         }
         buf = (GLubyte *) ctx->Driver.MapBuffer(ctx,
                                                 GL_PIXEL_UNPACK_BUFFER_EXT,
                                                 GL_READ_ONLY_ARB,
                                                 unpack->BufferObj);
         if (!buf) {
            /* buffer is already mapped - that's an error */
            _mesa_error(ctx, GL_INVALID_OPERATION,
                        "glDrawPixels(PBO is mapped)");
            return;
         }
         pixels = ADD_POINTERS(buf, pixels);
      }

      if (_mesa_clip_drawpixels(ctx, &dstX, &dstY, &w, &h, &clippedUnpack)) {
         /* This is a little tricky since all coordinates up to now have
          * been in the OpenGL bottom-to-top orientation.  X is top-to-bottom
          * so we have to carefully compute the Y coordinates/addresses here.
          */
         int srcX = clippedUnpack.SkipPixels;
         int srcY = clippedUnpack.SkipRows;
         int rowLength = clippedUnpack.RowLength;
         XMesaImage ximage;
         MEMSET(&ximage, 0, sizeof(XMesaImage));
         ximage.width = width;
         ximage.height = height;
         ximage.format = ZPixmap;
         ximage.data = (char *) pixels
            + ((srcY + h - 1) * rowLength + srcX) * 4;
         ximage.byte_order = LSBFirst;
         ximage.bitmap_unit = 32;
         ximage.bitmap_bit_order = LSBFirst;
         ximage.bitmap_pad = 32;
         ximage.depth = 24;
         ximage.bytes_per_line = -rowLength * 4; /* negative to flip image */
         ximage.bits_per_pixel = 32;
         /* it seems we don't need to set the ximage.red/green/blue_mask fields */
         /* flip Y axis for dest position */
         dstY = YFLIP(xrb, dstY) - h + 1;
         XPutImage(dpy, xrb->pixmap, gc, &ximage, 0, 0, dstX, dstY, w, h);
      }

      if (unpack->BufferObj->Name) {
         ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                                 unpack->BufferObj);
      }
   }
   else {
      /* software fallback */
      _swrast_DrawPixels(ctx, x, y, width, height,
                         format, type, unpack, pixels);
   }
}



/**
 * This function implements glDrawPixels() with an XPutImage call when
 * drawing to the front buffer (X Window drawable).  The image format
 * must be GL_RGB and image type must be GL_UNSIGNED_SHORT_5_6_5 to
 * match the PF_5R6G5B pixel format.
 */
static void
xmesa_DrawPixels_5R6G5B( GLcontext *ctx,
                         GLint x, GLint y, GLsizei width, GLsizei height,
                         GLenum format, GLenum type,
                         const struct gl_pixelstore_attrib *unpack,
                         const GLvoid *pixels )
{
   struct xmesa_renderbuffer *xrb
      = (struct xmesa_renderbuffer *) ctx->DrawBuffer->_ColorDrawBuffers[0][0];
   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
   const SWcontext *swrast = SWRAST_CONTEXT( ctx );
   XMesaDisplay *dpy = xmesa->xm_visual->display;
   XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
   const XMesaGC gc = xmbuf->gc;

   ASSERT(dpy);
   ASSERT(gc);
   ASSERT(xmesa->xm_visual->undithered_pf == PF_5R6G5B);

   if (swrast->NewState)
      _swrast_validate_derived( ctx );

   if (xrb->pixmap &&
       format == GL_RGB &&
       type == GL_UNSIGNED_SHORT_5_6_5 &&
       !ctx->Color.DitherFlag &&  /* no dithering */
       (swrast->_RasterMask & ~CLIP_BIT) == 0 && /* no blend, z-test, etc */
       ctx->_ImageTransferState == 0 &&  /* no color tables, scale/bias, etc */
       ctx->Pixel.ZoomX == 1.0 &&        /* no zooming */
       ctx->Pixel.ZoomY == 1.0) {
      int dstX = x;
      int dstY = y;
      int w = width;
      int h = height;
      struct gl_pixelstore_attrib clippedUnpack = *unpack;

      if (unpack->BufferObj->Name) {
         /* unpack from PBO */
         GLubyte *buf;
         if (!_mesa_validate_pbo_access(2, unpack, width, height, 1,
                                        format, type, pixels)) {
            _mesa_error(ctx, GL_INVALID_OPERATION,
                        "glDrawPixels(invalid PBO access)");
            return;
         }
         buf = (GLubyte *) ctx->Driver.MapBuffer(ctx,
                                                 GL_PIXEL_UNPACK_BUFFER_EXT,
                                                 GL_READ_ONLY_ARB,
                                                 unpack->BufferObj);
         if (!buf) {
            /* buffer is already mapped - that's an error */
            _mesa_error(ctx, GL_INVALID_OPERATION,
                        "glDrawPixels(PBO is mapped)");
            return;
         }
         pixels = ADD_POINTERS(buf, pixels);
      }

      if (_mesa_clip_drawpixels(ctx, &dstX, &dstY, &w, &h, &clippedUnpack)) {
         /* This is a little tricky since all coordinates up to now have
          * been in the OpenGL bottom-to-top orientation.  X is top-to-bottom
          * so we have to carefully compute the Y coordinates/addresses here.
          */
         int srcX = clippedUnpack.SkipPixels;
         int srcY = clippedUnpack.SkipRows;
         int rowLength = clippedUnpack.RowLength;
         XMesaImage ximage;
         MEMSET(&ximage, 0, sizeof(XMesaImage));
         ximage.width = width;
         ximage.height = height;
         ximage.format = ZPixmap;
         ximage.data = (char *) pixels
            + ((srcY + h - 1) * rowLength + srcX) * 2;
         ximage.byte_order = LSBFirst;
         ximage.bitmap_unit = 16;
         ximage.bitmap_bit_order = LSBFirst;
         ximage.bitmap_pad = 16;
         ximage.depth = 16;
         ximage.bytes_per_line = -rowLength * 2; /* negative to flip image */
         ximage.bits_per_pixel = 16;
         /* it seems we don't need to set the ximage.red/green/blue_mask fields */
         /* flip Y axis for dest position */
         dstY = YFLIP(xrb, dstY) - h + 1;
         XPutImage(dpy, xrb->pixmap, gc, &ximage, 0, 0, dstX, dstY, w, h);
      }

      if (unpack->BufferObj->Name) {
         ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                                 unpack->BufferObj);
      }
   }
   else {
      /* software fallback */
      _swrast_DrawPixels(ctx, x, y, width, height,
                         format, type, unpack, pixels);
   }
}



/**
 * Implement glCopyPixels for the front color buffer (or back buffer Pixmap)
 * for the color buffer.  Don't support zooming, pixel transfer, etc.
 * We do support copying from one window to another, ala glXMakeCurrentRead.
 */
static void
xmesa_CopyPixels( GLcontext *ctx,
                  GLint srcx, GLint srcy, GLsizei width, GLsizei height,
                  GLint destx, GLint desty, GLenum type )
{
   const XMesaContext xmesa = XMESA_CONTEXT(ctx);
   const SWcontext *swrast = SWRAST_CONTEXT( ctx );
   XMesaDisplay *dpy = xmesa->xm_visual->display;
   const XMesaGC gc = ((XMesaBuffer) ctx->DrawBuffer)->gc;
   struct xmesa_renderbuffer *srcXrb = (struct xmesa_renderbuffer *)
      ctx->ReadBuffer->_ColorReadBuffer;
   struct xmesa_renderbuffer *dstXrb = (struct xmesa_renderbuffer *)
      ctx->DrawBuffer->_ColorDrawBuffers[0][0];

   ASSERT(dpy);
   ASSERT(gc);

   if (swrast->NewState)
      _swrast_validate_derived( ctx );

   if (ctx->Color.DrawBuffer[0] == GL_FRONT &&
       ctx->Pixel.ReadBuffer == GL_FRONT &&
       srcXrb->pixmap &&
       dstXrb->pixmap &&
       type == GL_COLOR &&
       (swrast->_RasterMask & ~CLIP_BIT) == 0 && /* no blend, z-test, etc */
       ctx->_ImageTransferState == 0 &&  /* no color tables, scale/bias, etc */
       ctx->Pixel.ZoomX == 1.0 &&        /* no zooming */
       ctx->Pixel.ZoomY == 1.0) {
      /* Note: we don't do any special clipping work here.  We could,
       * but X will do it for us.
       */
      srcy = YFLIP(srcXrb, srcy) - height + 1;
      desty = YFLIP(dstXrb, desty) - height + 1;
      XCopyArea(dpy, srcXrb->pixmap, dstXrb->pixmap, gc,
                srcx, srcy, width, height, destx, desty);
   }
   else {
      _swrast_CopyPixels(ctx, srcx, srcy, width, height, destx, desty, type );
   }
}
#endif /* XFree86Server */



/*
 * Every driver should implement a GetString function in order to
 * return a meaningful GL_RENDERER string.
 */
static const GLubyte *
get_string( GLcontext *ctx, GLenum name )
{
   (void) ctx;
   switch (name) {
      case GL_RENDERER:
#ifdef XFree86Server
         return (const GLubyte *) "Mesa GLX Indirect";
#else
         return (const GLubyte *) "Mesa X11";
#endif
      case GL_VENDOR:
#ifdef XFree86Server
         return (const GLubyte *) "Mesa project: www.mesa3d.org";
#else
         return NULL;
#endif
      default:
         return NULL;
   }
}