pixel.c

winNT技术操作系统,国外开放的原代码和LIUX一样

                                     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) {
      case GL_PIXEL_MAP_I_TO_I:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT(ctx->Pixel.MapItoI[i]);
	 }
	 break;
      case GL_PIXEL_MAP_S_TO_S:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = (GLushort) ctx->Pixel.MapStoS[i];
	 }
	 break;
      case GL_PIXEL_MAP_I_TO_R:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoR[i] );
	 }
	 break;
      case GL_PIXEL_MAP_I_TO_G:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoG[i] );
	 }
	 break;
      case GL_PIXEL_MAP_I_TO_B:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoB[i] );
	 }
	 break;
      case GL_PIXEL_MAP_I_TO_A:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoA[i] );
	 }
	 break;
      case GL_PIXEL_MAP_R_TO_R:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapRtoR[i] );
	 }
	 break;
      case GL_PIXEL_MAP_G_TO_G:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapGtoG[i] );
	 }
	 break;
      case GL_PIXEL_MAP_B_TO_B:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapBtoB[i] );
	 }
	 break;
      case GL_PIXEL_MAP_A_TO_A:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapAtoA[i] );
	 }
	 break;
      default:
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
   }

   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)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.GreenScale = param;
	 break;
      case GL_GREEN_BIAS:
         if (ctx->Pixel.GreenBias == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.GreenBias = param;
	 break;
      case GL_BLUE_SCALE:
         if (ctx->Pixel.BlueScale == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.BlueScale = param;
	 break;
      case GL_BLUE_BIAS:
         if (ctx->Pixel.BlueBias == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.BlueBias = param;
	 break;
      case GL_ALPHA_SCALE:
         if (ctx->Pixel.AlphaScale == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.AlphaScale = param;
	 break;
      case GL_ALPHA_BIAS:
         if (ctx->Pixel.AlphaBias == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.AlphaBias = param;
	 break;
      case GL_DEPTH_SCALE:
         if (ctx->Pixel.DepthScale == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.DepthScale = param;
	 break;
      case GL_DEPTH_BIAS:
         if (ctx->Pixel.DepthBias == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.DepthBias = param;
	 break;
      case GL_POST_COLOR_MATRIX_RED_SCALE:
         if (ctx->Pixel.PostColorMatrixScale[0] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostColorMatrixScale[0] = param;
	 break;
      case GL_POST_COLOR_MATRIX_RED_BIAS:
         if (ctx->Pixel.PostColorMatrixBias[0] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostColorMatrixBias[0] = param;
	 break;
      case GL_POST_COLOR_MATRIX_GREEN_SCALE:
         if (ctx->Pixel.PostColorMatrixScale[1] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostColorMatrixScale[1] = param;
	 break;
      case GL_POST_COLOR_MATRIX_GREEN_BIAS:
         if (ctx->Pixel.PostColorMatrixBias[1] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostColorMatrixBias[1] = param;
	 break;
      case GL_POST_COLOR_MATRIX_BLUE_SCALE:
         if (ctx->Pixel.PostColorMatrixScale[2] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostColorMatrixScale[2] = param;
	 break;
      case GL_POST_COLOR_MATRIX_BLUE_BIAS:
         if (ctx->Pixel.PostColorMatrixBias[2] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostColorMatrixBias[2] = param;
	 break;
      case GL_POST_COLOR_MATRIX_ALPHA_SCALE:
         if (ctx->Pixel.PostColorMatrixScale[3] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostColorMatrixScale[3] = param;
	 break;
      case GL_POST_COLOR_MATRIX_ALPHA_BIAS:
         if (ctx->Pixel.PostColorMatrixBias[3] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostColorMatrixBias[3] = param;
	 break;
      case GL_POST_CONVOLUTION_RED_SCALE:
         if (ctx->Pixel.PostConvolutionScale[0] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostConvolutionScale[0] = param;
	 break;
      case GL_POST_CONVOLUTION_RED_BIAS:
         if (ctx->Pixel.PostConvolutionBias[0] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostConvolutionBias[0] = param;
	 break;
      case GL_POST_CONVOLUTION_GREEN_SCALE:
         if (ctx->Pixel.PostConvolutionScale[1] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostConvolutionScale[1] = param;
	 break;
      case GL_POST_CONVOLUTION_GREEN_BIAS:
         if (ctx->Pixel.PostConvolutionBias[1] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostConvolutionBias[1] = param;
	 break;
      case GL_POST_CONVOLUTION_BLUE_SCALE:
         if (ctx->Pixel.PostConvolutionScale[2] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostConvolutionScale[2] = param;
	 break;
      case GL_POST_CONVOLUTION_BLUE_BIAS:
         if (ctx->Pixel.PostConvolutionBias[2] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostConvolutionBias[2] = param;
	 break;
      case GL_POST_CONVOLUTION_ALPHA_SCALE:
         if (ctx->Pixel.PostConvolutionScale[2] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostConvolutionScale[2] = param;
	 break;
      case GL_POST_CONVOLUTION_ALPHA_BIAS:
         if (ctx->Pixel.PostConvolutionBias[2] == param)
	    return;
	 FLUSH_VERTICES(ctx, _NEW_PIXEL);
         ctx->Pixel.PostConvolutionBias[2] = param;
	 break;
      default:
         _mesa_error( ctx, GL_INVALID_ENUM, "glPixelTransfer(pname)" );
         return;
   }
}


void GLAPIENTRY
_mesa_PixelTransferi( GLenum pname, GLint param )
{
   _mesa_PixelTransferf( pname, (GLfloat) param );
}



/**********************************************************************/
/*****                  Pixel processing functions               ******/
/**********************************************************************/

/*
 * Apply scale and bias factors to an array of RGBA pixels.
 */
void
_mesa_scale_and_bias_rgba(GLuint n, GLfloat rgba[][4],
                          GLfloat rScale, GLfloat gScale,
                          GLfloat bScale, GLfloat aScale,
                          GLfloat rBias, GLfloat gBias,
                          GLfloat bBias, GLfloat aBias)
{
   if (rScale != 1.0 || rBias != 0.0) {
      GLuint i;
      for (i = 0; i < n; i++) {
         rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias;
      }
   }
   if (gScale != 1.0 || gBias != 0.0) {
      GLuint i;
      for (i = 0; i < n; i++) {
         rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias;
      }
   }
   if (bScale != 1.0 || bBias != 0.0) {
      GLuint i;
      for (i = 0; i < n; i++) {
         rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias;
      }
   }
   if (aScale != 1.0 || aBias != 0.0) {
      GLuint i;
      for (i = 0; i < n; i++) {
         rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias;
      }
   }
}


/*
 * Apply pixel mapping to an array of floating point RGBA pixels.
 */
void
_mesa_map_rgba( const GLcontext *ctx, GLuint n, GLfloat rgba[][4] )
{
   const GLfloat rscale = (GLfloat) (ctx->Pixel.MapRtoRsize - 1);
   const GLfloat gscale = (GLfloat) (ctx->Pixel.MapGtoGsize - 1);
   const GLfloat bscale = (GLfloat) (ctx->Pixel.MapBtoBsize - 1);
   const GLfloat ascale = (GLfloat) (ctx->Pixel.MapAtoAsize - 1);
   const GLfloat *rMap = ctx->Pixel.MapRtoR;
   const GLfloat *gMap = ctx->Pixel.MapGtoG;
   const GLfloat *bMap = ctx->Pixel.MapBtoB;
   const GLfloat *aMap = ctx->Pixel.MapAtoA;
   GLuint i;
   for (i=0;i<n;i++) {
      GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
      GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
      GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
      GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
      rgba[i][RCOMP] = rMap[IROUND(r * rscale)];
      rgba[i][GCOMP] = gMap[IROUND(g * gscale)];
      rgba[i][BCOMP] = bMap[IROUND(b * bscale)];
      rgba[i][ACOMP] = aMap[IROUND(a * ascale)];
   }
}


/*
 * Apply the color matrix and post color matrix scaling and biasing.
 */
void
_mesa_transform_rgba(const GLcontext *ctx, GLuint n, GLfloat rgba[][4])
{
   const GLfloat rs = ctx->Pixel.PostColorMatrixScale[0];
   const GLfloat rb = ctx->Pixel.PostColorMatrixBias[0];
   const GLfloat gs = ctx->Pixel.PostColorMatrixScale[1];
   const GLfloat gb = ctx->Pixel.PostColorMatrixBias[1];
   const GLfloat bs = ctx->Pixel.PostColorMatrixScale[2];
   const GLfloat bb = ctx->Pixel.PostColorMatrixBias[2];
   const GLfloat as = ctx->Pixel.PostColorMatrixScale[3];
   const GLfloat ab = ctx->Pixel.PostColorMatrixBias[3];
   const GLfloat *m = ctx->ColorMatrixStack.Top->m;
   GLuint i;
   for (i = 0; i < n; i++) {
      const GLfloat r = rgba[i][RCOMP];
      const GLfloat g = rgba[i][GCOMP];
      const GLfloat b = rgba[i][BCOMP];
      const GLfloat a = rgba[i][ACOMP];