fxdd.c

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

   if (mode == GL_FRONT_LEFT) {
      fxMesa->currentFB = GR_BUFFER_FRONTBUFFER;
      grRenderBuffer(fxMesa->currentFB);
   }
   else if (mode == GL_BACK_LEFT) {
      fxMesa->currentFB = GR_BUFFER_BACKBUFFER;
      grRenderBuffer(fxMesa->currentFB);
   }
   else if (mode == GL_NONE) {
      fxDisableColor(fxMesa);
   }
   else {
      /* we'll need a software fallback */
      /* XXX not implemented */
   }

   /* update s/w fallback state */
   _swrast_DrawBuffer(ctx, mode);
}


static void
fxDDDrawBitmap2 (GLcontext *ctx, GLint px, GLint py,
		 GLsizei width, GLsizei height,
		 const struct gl_pixelstore_attrib *unpack,
		 const GLubyte *bitmap)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   GrLfbInfo_t info;
   GrLfbWriteMode_t mode;
   FxU16 color;
   const struct gl_pixelstore_attrib *finalUnpack;
   struct gl_pixelstore_attrib scissoredUnpack;

   /* check if there's any raster operations enabled which we can't handle */
   if (swrast->_RasterMask & (ALPHATEST_BIT |
			      /*BLEND_BIT |*/   /* blending ok, through pixpipe */
			      DEPTH_BIT |       /* could be done with RGB:DEPTH */
			      FOG_BIT |         /* could be done with RGB:DEPTH */
			      LOGIC_OP_BIT |
			      /*CLIP_BIT |*/    /* clipping ok, below */
			      STENCIL_BIT |
			      MASKING_BIT |
			      MULTI_DRAW_BIT |
			      OCCLUSION_BIT |   /* nope! at least not yet */
			      TEXTURE_BIT |
			      FRAGPROG_BIT)) {
      _swrast_Bitmap(ctx, px, py, width, height, unpack, bitmap);
      return;
   }

   /* make sure the pixelpipe is configured correctly */
   fxSetupFXUnits(ctx);

   /* FIXME! _RasterMask & CLIP_BIT gets set if we're out of Viewport, also! */
   if (ctx->Scissor.Enabled) {
      /* This is a bit tricky, but by carefully adjusting the px, py,
       * width, height, skipPixels and skipRows values we can do
       * scissoring without special code in the rendering loop.
       */

      /* we'll construct a new pixelstore struct */
      finalUnpack = &scissoredUnpack;
      scissoredUnpack = *unpack;
      if (scissoredUnpack.RowLength == 0)
	 scissoredUnpack.RowLength = width;

      /* clip left */
      if (px < ctx->Scissor.X) {
	 scissoredUnpack.SkipPixels += (ctx->Scissor.X - px);
	 width -= (ctx->Scissor.X - px);
	 px = ctx->Scissor.X;
      }
      /* clip right */
      if (px + width >= ctx->Scissor.X + ctx->Scissor.Width) {
	 width -= (px + width - (ctx->Scissor.X + ctx->Scissor.Width));
      }
      /* clip bottom */
      if (py < ctx->Scissor.Y) {
	 scissoredUnpack.SkipRows += (ctx->Scissor.Y - py);
	 height -= (ctx->Scissor.Y - py);
	 py = ctx->Scissor.Y;
      }
      /* clip top */
      if (py + height >= ctx->Scissor.Y + ctx->Scissor.Height) {
	 height -= (py + height - (ctx->Scissor.Y + ctx->Scissor.Height));
      }

      if (width <= 0 || height <= 0)
	 return;
   }
   else {
      finalUnpack = unpack;
   }

   /* compute pixel value */
   {
      GLint r = (GLint) (ctx->Current.RasterColor[RCOMP] * 255.0f);
      GLint g = (GLint) (ctx->Current.RasterColor[GCOMP] * 255.0f);
      GLint b = (GLint) (ctx->Current.RasterColor[BCOMP] * 255.0f);
      GLint a = (GLint) (ctx->Current.RasterColor[ACOMP] * 255.0f);
      if (fxMesa->colDepth == 15) {
         color = TDFXPACKCOLOR1555(b, g, r, a);
         mode = GR_LFBWRITEMODE_1555;
      } else {
         color = fxMesa->bgrOrder ? TDFXPACKCOLOR565(r, g, b) : TDFXPACKCOLOR565(b, g, r);
         mode = GR_LFBWRITEMODE_565;
      }
   }

   info.size = sizeof(info);
   if (!grLfbLock(GR_LFB_WRITE_ONLY,
		  fxMesa->currentFB,
		  mode,
		  GR_ORIGIN_LOWER_LEFT, FXTRUE, &info)) {
      _swrast_Bitmap(ctx, px, py, width, height, finalUnpack, bitmap);
      return;
   }

   {
      const GLint winX = 0;
      const GLint winY = 0;
      /* The dest stride depends on the hardware and whether we're drawing
       * to the front or back buffer.  This compile-time test seems to do
       * the job for now.
       */
      const GLint dstStride = info.strideInBytes / 2;	/* stride in GLushorts */

      GLint row;
      /* compute dest address of bottom-left pixel in bitmap */
      GLushort *dst = (GLushort *) info.lfbPtr
	 + (winY + py) * dstStride + (winX + px);

      for (row = 0; row < height; row++) {
	 const GLubyte *src =
	    (const GLubyte *) _mesa_image_address2d(finalUnpack,
                                                    bitmap, width, height,
                                                    GL_COLOR_INDEX, GL_BITMAP,
                                                    row, 0);
	 if (finalUnpack->LsbFirst) {
	    /* least significan bit first */
	    GLubyte mask = 1U << (finalUnpack->SkipPixels & 0x7);
	    GLint col;
	    for (col = 0; col < width; col++) {
	       if (*src & mask) {
		  dst[col] = color;
	       }
	       if (mask == 128U) {
		  src++;
		  mask = 1U;
	       }
	       else {
		  mask = mask << 1;
	       }
	    }
	    if (mask != 1)
	       src++;
	 }
	 else {
	    /* most significan bit first */
	    GLubyte mask = 128U >> (finalUnpack->SkipPixels & 0x7);
	    GLint col;
	    for (col = 0; col < width; col++) {
	       if (*src & mask) {
		  dst[col] = color;
	       }
	       if (mask == 1U) {
		  src++;
		  mask = 128U;
	       }
	       else {
		  mask = mask >> 1;
	       }
	    }
	    if (mask != 128)
	       src++;
	 }
	 dst += dstStride;
      }
   }

   grLfbUnlock(GR_LFB_WRITE_ONLY, fxMesa->currentFB);
}

static void
fxDDDrawBitmap4 (GLcontext *ctx, GLint px, GLint py,
		 GLsizei width, GLsizei height,
		 const struct gl_pixelstore_attrib *unpack,
		 const GLubyte *bitmap)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   GrLfbInfo_t info;
   FxU32 color;
   const struct gl_pixelstore_attrib *finalUnpack;
   struct gl_pixelstore_attrib scissoredUnpack;

   /* check if there's any raster operations enabled which we can't handle */
   if ((swrast->_RasterMask & (/*ALPHATEST_BIT |*/
			      /*BLEND_BIT |*/   /* blending ok, through pixpipe */
			      DEPTH_BIT |       /* could be done with RGB:DEPTH */
			      FOG_BIT |         /* could be done with RGB:DEPTH */
			      LOGIC_OP_BIT |
			      /*CLIP_BIT |*/    /* clipping ok, below */
			      STENCIL_BIT |
			      /*MASKING_BIT |*/ /* masking ok, we're in 32bpp */
			      MULTI_DRAW_BIT |
			      OCCLUSION_BIT |   /* nope! at least not yet */
			      TEXTURE_BIT |
			      FRAGPROG_BIT))
      ) {
      _swrast_Bitmap(ctx, px, py, width, height, unpack, bitmap);
      return;
   }

   /* make sure the pixelpipe is configured correctly */
   fxSetupFXUnits(ctx);

   /* FIXME! _RasterMask & CLIP_BIT gets set if we're out of Viewport, also! */
   if (ctx->Scissor.Enabled) {
      /* This is a bit tricky, but by carefully adjusting the px, py,
       * width, height, skipPixels and skipRows values we can do
       * scissoring without special code in the rendering loop.
       */

      /* we'll construct a new pixelstore struct */
      finalUnpack = &scissoredUnpack;
      scissoredUnpack = *unpack;
      if (scissoredUnpack.RowLength == 0)
	 scissoredUnpack.RowLength = width;

      /* clip left */
      if (px < ctx->Scissor.X) {
	 scissoredUnpack.SkipPixels += (ctx->Scissor.X - px);
	 width -= (ctx->Scissor.X - px);
	 px = ctx->Scissor.X;
      }
      /* clip right */
      if (px + width >= ctx->Scissor.X + ctx->Scissor.Width) {
	 width -= (px + width - (ctx->Scissor.X + ctx->Scissor.Width));
      }
      /* clip bottom */
      if (py < ctx->Scissor.Y) {
	 scissoredUnpack.SkipRows += (ctx->Scissor.Y - py);
	 height -= (ctx->Scissor.Y - py);
	 py = ctx->Scissor.Y;
      }
      /* clip top */
      if (py + height >= ctx->Scissor.Y + ctx->Scissor.Height) {
	 height -= (py + height - (ctx->Scissor.Y + ctx->Scissor.Height));
      }

      if (width <= 0 || height <= 0)
	 return;
   }
   else {
      finalUnpack = unpack;
   }

   /* compute pixel value */
   {
      GLint r = (GLint) (ctx->Current.RasterColor[RCOMP] * 255.0f);
      GLint g = (GLint) (ctx->Current.RasterColor[GCOMP] * 255.0f);
      GLint b = (GLint) (ctx->Current.RasterColor[BCOMP] * 255.0f);
      GLint a = (GLint) (ctx->Current.RasterColor[ACOMP] * 255.0f);
      color = TDFXPACKCOLOR8888(b, g, r, a);
   }

   info.size = sizeof(info);
   if (!grLfbLock(GR_LFB_WRITE_ONLY,
		  fxMesa->currentFB,
		  GR_LFBWRITEMODE_8888,
		  GR_ORIGIN_LOWER_LEFT, FXTRUE, &info)) {
      _swrast_Bitmap(ctx, px, py, width, height, finalUnpack, bitmap);
      return;
   }

   {
      const GLint winX = 0;
      const GLint winY = 0;
      /* The dest stride depends on the hardware and whether we're drawing
       * to the front or back buffer.  This compile-time test seems to do
       * the job for now.
       */
      const GLint dstStride = info.strideInBytes / 4;	/* stride in GLuints */

      GLint row;
      /* compute dest address of bottom-left pixel in bitmap */
      GLuint *dst = (GLuint *) info.lfbPtr
	 + (winY + py) * dstStride + (winX + px);

      for (row = 0; row < height; row++) {
	 const GLubyte *src =
	    (const GLubyte *) _mesa_image_address2d(finalUnpack,
                                                    bitmap, width, height,
                                                    GL_COLOR_INDEX, GL_BITMAP,
                                                    row, 0);
	 if (finalUnpack->LsbFirst) {
	    /* least significan bit first */
	    GLubyte mask = 1U << (finalUnpack->SkipPixels & 0x7);
	    GLint col;
	    for (col = 0; col < width; col++) {
	       if (*src & mask) {
		  dst[col] = color;
	       }
	       if (mask == 128U) {
		  src++;
		  mask = 1U;
	       }
	       else {
		  mask = mask << 1;
	       }
	    }
	    if (mask != 1)
	       src++;
	 }
	 else {
	    /* most significan bit first */
	    GLubyte mask = 128U >> (finalUnpack->SkipPixels & 0x7);
	    GLint col;
	    for (col = 0; col < width; col++) {
	       if (*src & mask) {
		  dst[col] = color;
	       }
	       if (mask == 1U) {
		  src++;
		  mask = 128U;
	       }
	       else {
		  mask = mask >> 1;
	       }
	    }
	    if (mask != 128)
	       src++;
	 }
	 dst += dstStride;
      }
   }

   grLfbUnlock(GR_LFB_WRITE_ONLY, fxMesa->currentFB);
}


static void
fxDDReadPixels565 (GLcontext * ctx,
		   GLint x, GLint y,
		   GLsizei width, GLsizei height,
		   GLenum format, GLenum type,
		   const struct gl_pixelstore_attrib *packing,
		   GLvoid *dstImage)
{
   if (ctx->_ImageTransferState/* & (IMAGE_SCALE_BIAS_BIT|IMAGE_MAP_COLOR_BIT)*/) {
      _swrast_ReadPixels(ctx, x, y, width, height, format, type,
			 packing, dstImage);
      return;
   }
   else {
      fxMesaContext fxMesa = FX_CONTEXT(ctx);
      GrLfbInfo_t info;

      BEGIN_BOARD_LOCK();
      info.size = sizeof(info);
      if (grLfbLock(GR_LFB_READ_ONLY,
		    fxMesa->currentFB,
		    GR_LFBWRITEMODE_ANY,
		    GR_ORIGIN_UPPER_LEFT, FXFALSE, &info)) {
	 const GLint winX = 0;
	 const GLint winY = fxMesa->height - 1;
	 const GLint srcStride = info.strideInBytes / 2;	/* stride in GLushorts */
	 const GLushort *src = (const GLushort *) info.lfbPtr
	    + (winY - y) * srcStride + (winX + x);
	 GLubyte *dst = (GLubyte *) _mesa_image_address2d(packing, dstImage,
							width, height, format,
							type, 0, 0);
	 GLint dstStride =
	    _mesa_image_row_stride(packing, width, format, type);

	 if (format == GL_RGB && type == GL_UNSIGNED_BYTE) {
	    /* convert 5R6G5B into 8R8G8B */
	    GLint row, col;
	    const GLint halfWidth = width >> 1;
	    const GLint extraPixel = (width & 1);
	    for (row = 0; row < height; row++) {
	       GLubyte *d = dst;
	       for (col = 0; col < halfWidth; col++) {
		  const GLuint pixel = ((const GLuint *) src)[col];
                  *d++ = FX_rgb_scale_5[(pixel >> 11) & 0x1f];
                  *d++ = FX_rgb_scale_6[(pixel >> 5)  & 0x3f];
                  *d++ = FX_rgb_scale_5[ pixel        & 0x1f];
                  *d++ = FX_rgb_scale_5[(pixel >> 27) & 0x1f];
                  *d++ = FX_rgb_scale_6[(pixel >> 21) & 0x3f];
                  *d++ = FX_rgb_scale_5[(pixel >> 16) & 0x1f];
	       }
	       if (extraPixel) {
		  GLushort pixel = src[width - 1];
                  *d++ = FX_rgb_scale_5[(pixel >> 11) & 0x1f];
                  *d++ = FX_rgb_scale_6[(pixel >> 5)  & 0x3f];
                  *d++ = FX_rgb_scale_5[ pixel        & 0x1f];
	       }
	       dst += dstStride;
	       src -= srcStride;