pixel.c

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

   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
      return;
   }

   if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
      /* test that mapsize is a power of two */
      if (_mesa_bitcount((GLuint) mapsize) != 1) {
	 _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
         return;
      }
   }

   FLUSH_VERTICES(ctx, _NEW_PIXEL);

   if (ctx->Unpack.BufferObj->Name) {
      /* unpack pixelmap from PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Unpack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Unpack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_INT, values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glPixelMapuiv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                                              GL_READ_ONLY_ARB,
                                              ctx->Unpack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glPixelMapuiv(PBO is mapped)");
         return;
      }
      values = (const GLuint *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   /* convert to floats */
   if (map == GL_PIXEL_MAP_I_TO_I || map == GL_PIXEL_MAP_S_TO_S) {
      GLint i;
      for (i = 0; i < mapsize; i++) {
         fvalues[i] = (GLfloat) values[i];
      }
   }
   else {
      GLint i;
      for (i = 0; i < mapsize; i++) {
         fvalues[i] = UINT_TO_FLOAT( values[i] );
      }
   }

   if (ctx->Unpack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                              ctx->Unpack.BufferObj);
   }

   store_pixelmap(ctx, map, mapsize, fvalues);
}


void GLAPIENTRY
_mesa_PixelMapusv(GLenum map, GLsizei mapsize, const GLushort *values )
{
   GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapusv(mapsize)" );
      return;
   }

   if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
      /* test that mapsize is a power of two */
      if (_mesa_bitcount((GLuint) mapsize) != 1) {
	 _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
         return;
      }
   }

   FLUSH_VERTICES(ctx, _NEW_PIXEL);

   if (ctx->Unpack.BufferObj->Name) {
      /* unpack pixelmap from PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Unpack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Unpack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_SHORT,
                                     values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glPixelMapusv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                                              GL_READ_ONLY_ARB,
                                              ctx->Unpack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glPixelMapusv(PBO is mapped)");
         return;
      }
      values = (const GLushort *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   /* convert to floats */
   if (map == GL_PIXEL_MAP_I_TO_I || map == GL_PIXEL_MAP_S_TO_S) {
      GLint i;
      for (i = 0; i < mapsize; i++) {
         fvalues[i] = (GLfloat) values[i];
      }
   }
   else {
      GLint i;
      for (i = 0; i < mapsize; i++) {
         fvalues[i] = USHORT_TO_FLOAT( values[i] );
      }
   }

   if (ctx->Unpack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                              ctx->Unpack.BufferObj);
   }

   store_pixelmap(ctx, map, mapsize, fvalues);
}


void GLAPIENTRY
_mesa_GetPixelMapfv( GLenum map, GLfloat *values )
{
   GET_CURRENT_CONTEXT(ctx);
   GLuint mapsize, i;
   const struct gl_pixelmap *pm;

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   pm = get_pixelmap(ctx, map);
   if (!pm) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapfv(map)");
      return;
   }

   mapsize = pm->Size;

   if (ctx->Pack.BufferObj->Name) {
      /* pack pixelmap into PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Pack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Pack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_FLOAT, values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapfv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                                              GL_WRITE_ONLY_ARB,
                                              ctx->Pack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapfv(PBO is mapped)");
         return;
      }
      values = (GLfloat *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   if (map == GL_PIXEL_MAP_S_TO_S) {
      /* special case */
      for (i = 0; i < mapsize; i++) {
         values[i] = (GLfloat) ctx->PixelMaps.StoS.Map[i];
      }
   }
   else {
      MEMCPY(values, pm->Map, mapsize * sizeof(GLfloat));
   }

   if (ctx->Pack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                              ctx->Pack.BufferObj);
   }
}


void GLAPIENTRY
_mesa_GetPixelMapuiv( GLenum map, GLuint *values )
{
   GET_CURRENT_CONTEXT(ctx);
   GLint mapsize, i;
   const struct gl_pixelmap *pm;

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   pm = get_pixelmap(ctx, map);
   if (!pm) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapuiv(map)");
      return;
   }
   mapsize = pm->Size;

   if (ctx->Pack.BufferObj->Name) {
      /* pack pixelmap into PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Pack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Pack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_INT, values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapuiv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                                              GL_WRITE_ONLY_ARB,
                                              ctx->Pack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapuiv(PBO is mapped)");
         return;
      }
      values = (GLuint *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   if (map == GL_PIXEL_MAP_S_TO_S) {
      /* special case */
      MEMCPY(values, ctx->PixelMaps.StoS.Map, mapsize * sizeof(GLint));
   }
   else {
      for (i = 0; i < mapsize; i++) {
         values[i] = FLOAT_TO_UINT( pm->Map[i] );
      }
   }

   if (ctx->Pack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                              ctx->Pack.BufferObj);
   }
}


void GLAPIENTRY
_mesa_GetPixelMapusv( GLenum map, GLushort *values )
{
   GET_CURRENT_CONTEXT(ctx);
   GLint mapsize, i;
   const struct gl_pixelmap *pm;

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   pm = get_pixelmap(ctx, map);
   if (!pm) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapusv(map)");
      return;
   }
   mapsize = pm ? pm->Size : 0;

   if (ctx->Pack.BufferObj->Name) {
      /* pack pixelmap into PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Pack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Pack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_SHORT,
                                     values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapusv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                                              GL_WRITE_ONLY_ARB,
                                              ctx->Pack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapusv(PBO is mapped)");
         return;
      }
      values = (GLushort *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   switch (map) {
   /* special cases */
   case GL_PIXEL_MAP_I_TO_I:
      for (i = 0; i < mapsize; i++) {
         values[i] = (GLushort) CLAMP(ctx->PixelMaps.ItoI.Map[i], 0.0, 65535.);
      }
      break;
   case GL_PIXEL_MAP_S_TO_S:
      for (i = 0; i < mapsize; i++) {
         values[i] = (GLushort) CLAMP(ctx->PixelMaps.StoS.Map[i], 0.0, 65535.);
      }
      break;
   default:
      for (i = 0; i < mapsize; i++) {
         CLAMPED_FLOAT_TO_USHORT(values[i], pm->Map[i] );
      }
   }

   if (ctx->Pack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                              ctx->Pack.BufferObj);
   }
}



/**********************************************************************/
/*****                       glPixelTransfer                      *****/
/**********************************************************************/


/*
 * Implements glPixelTransfer[fi] whether called immediately or from a
 * display list.
 */
void GLAPIENTRY
_mesa_PixelTransferf( GLenum pname, GLfloat param )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   switch (pname) {
      case GL_MAP_COLOR:
         if (ctx->Pixel.MapColorFlag == (param ? GL_TRUE : GL_FALSE))
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.MapColorFlag = param ? GL_TRUE : GL_FALSE;
	 break;
      case GL_MAP_STENCIL:
         if (ctx->Pixel.MapStencilFlag == (param ? GL_TRUE : GL_FALSE))
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.MapStencilFlag = param ? GL_TRUE : GL_FALSE;
	 break;
      case GL_INDEX_SHIFT:
         if (ctx->Pixel.IndexShift == (GLint) param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.IndexShift = (GLint) param;
	 break;
      case GL_INDEX_OFFSET:
         if (ctx->Pixel.IndexOffset == (GLint) param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.IndexOffset = (GLint) param;
	 break;
      case GL_RED_SCALE:
         if (ctx->Pixel.RedScale == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.RedScale = param;
	 break;
      case GL_RED_BIAS:
         if (ctx->Pixel.RedBias == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.RedBias = param;
	 break;
      case GL_GREEN_SCALE:
         if (ctx->Pixel.GreenScale == param)