histogram.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

      _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogram(format)");
   }

   if (!_mesa_is_legal_format_and_type(ctx, format, type)) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetHistogram(format or type)");
      return;
   }

   if (ctx->Pack.BufferObj->Name) {
      /* pack min/max values into a PBO */
      GLubyte *buf;
      if (!_mesa_validate_pbo_access(1, &ctx->Pack, ctx->Histogram.Width, 1, 1,
                                     format, type, values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetHistogram(invalid PBO access)");
         return;
      }
      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,"glGetHistogram(PBO is mapped)");
         return;
      }
      values = ADD_POINTERS(buf, values);
   }
   else if (!values) {
      /* not an error */
      return;
   }

   pack_histogram(ctx, ctx->Histogram.Width,
                  (CONST GLuint (*)[4]) ctx->Histogram.Count,
                  format, type, values, &ctx->Pack);

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

   if (reset) {
      GLuint i;
      for (i = 0; i < HISTOGRAM_TABLE_SIZE; i++) {
         ctx->Histogram.Count[i][0] = 0;
         ctx->Histogram.Count[i][1] = 0;
         ctx->Histogram.Count[i][2] = 0;
         ctx->Histogram.Count[i][3] = 0;
      }
   }
}


void GLAPIENTRY
_mesa_GetHistogramParameterfv(GLenum target, GLenum pname, GLfloat *params)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetHistogramParameterfv");
      return;
   }

   if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameterfv(target)");
      return;
   }

   switch (pname) {
      case GL_HISTOGRAM_WIDTH:
         *params = (GLfloat) ctx->Histogram.Width;
         break;
      case GL_HISTOGRAM_FORMAT:
         *params = (GLfloat) ctx->Histogram.Format;
         break;
      case GL_HISTOGRAM_RED_SIZE:
         *params = (GLfloat) ctx->Histogram.RedSize;
         break;
      case GL_HISTOGRAM_GREEN_SIZE:
         *params = (GLfloat) ctx->Histogram.GreenSize;
         break;
      case GL_HISTOGRAM_BLUE_SIZE:
         *params = (GLfloat) ctx->Histogram.BlueSize;
         break;
      case GL_HISTOGRAM_ALPHA_SIZE:
         *params = (GLfloat) ctx->Histogram.AlphaSize;
         break;
      case GL_HISTOGRAM_LUMINANCE_SIZE:
         *params = (GLfloat) ctx->Histogram.LuminanceSize;
         break;
      case GL_HISTOGRAM_SINK:
         *params = (GLfloat) ctx->Histogram.Sink;
         break;
      default:
         _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameterfv(pname)");
   }
}


void GLAPIENTRY
_mesa_GetHistogramParameteriv(GLenum target, GLenum pname, GLint *params)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetHistogramParameteriv");
      return;
   }

   if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameteriv(target)");
      return;
   }

   switch (pname) {
      case GL_HISTOGRAM_WIDTH:
         *params = (GLint) ctx->Histogram.Width;
         break;
      case GL_HISTOGRAM_FORMAT:
         *params = (GLint) ctx->Histogram.Format;
         break;
      case GL_HISTOGRAM_RED_SIZE:
         *params = (GLint) ctx->Histogram.RedSize;
         break;
      case GL_HISTOGRAM_GREEN_SIZE:
         *params = (GLint) ctx->Histogram.GreenSize;
         break;
      case GL_HISTOGRAM_BLUE_SIZE:
         *params = (GLint) ctx->Histogram.BlueSize;
         break;
      case GL_HISTOGRAM_ALPHA_SIZE:
         *params = (GLint) ctx->Histogram.AlphaSize;
         break;
      case GL_HISTOGRAM_LUMINANCE_SIZE:
         *params = (GLint) ctx->Histogram.LuminanceSize;
         break;
      case GL_HISTOGRAM_SINK:
         *params = (GLint) ctx->Histogram.Sink;
         break;
      default:
         _mesa_error(ctx, GL_INVALID_ENUM, "glGetHistogramParameteriv(pname)");
   }
}


void GLAPIENTRY
_mesa_GetMinmaxParameterfv(GLenum target, GLenum pname, GLfloat *params)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetMinmaxParameterfv");
      return;
   }
   if (target != GL_MINMAX) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinmaxParameterfv(target)");
      return;
   }
   if (pname == GL_MINMAX_FORMAT) {
      *params = (GLfloat) ctx->MinMax.Format;
   }
   else if (pname == GL_MINMAX_SINK) {
      *params = (GLfloat) ctx->MinMax.Sink;
   }
   else {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinMaxParameterfv(pname)");
   }
}


void GLAPIENTRY
_mesa_GetMinmaxParameteriv(GLenum target, GLenum pname, GLint *params)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetMinmaxParameteriv");
      return;
   }
   if (target != GL_MINMAX) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinmaxParameteriv(target)");
      return;
   }
   if (pname == GL_MINMAX_FORMAT) {
      *params = (GLint) ctx->MinMax.Format;
   }
   else if (pname == GL_MINMAX_SINK) {
      *params = (GLint) ctx->MinMax.Sink;
   }
   else {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetMinMaxParameteriv(pname)");
   }
}


void GLAPIENTRY
_mesa_Histogram(GLenum target, GLsizei width, GLenum internalFormat, GLboolean sink)
{
   GLuint i;
   GLboolean error = GL_FALSE;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* sideeffects */

   if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glHistogram");
      return;
   }

   if (target != GL_HISTOGRAM && target != GL_PROXY_HISTOGRAM) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glHistogram(target)");
      return;
   }

   if (width < 0 || width > HISTOGRAM_TABLE_SIZE) {
      if (target == GL_PROXY_HISTOGRAM) {
         error = GL_TRUE;
      }
      else {
         if (width < 0)
            _mesa_error(ctx, GL_INVALID_VALUE, "glHistogram(width)");
         else
            _mesa_error(ctx, GL_TABLE_TOO_LARGE, "glHistogram(width)");
         return;
      }
   }

   if (width != 0 && _mesa_bitcount(width) != 1) {
      if (target == GL_PROXY_HISTOGRAM) {
         error = GL_TRUE;
      }
      else {
         _mesa_error(ctx, GL_INVALID_VALUE, "glHistogram(width)");
         return;
      }
   }

   if (base_histogram_format(internalFormat) < 0) {
      if (target == GL_PROXY_HISTOGRAM) {
         error = GL_TRUE;
      }
      else {
         _mesa_error(ctx, GL_INVALID_ENUM, "glHistogram(internalFormat)");
         return;
      }
   }

   /* reset histograms */
   for (i = 0; i < HISTOGRAM_TABLE_SIZE; i++) {
      ctx->Histogram.Count[i][0] = 0;
      ctx->Histogram.Count[i][1] = 0;
      ctx->Histogram.Count[i][2] = 0;
      ctx->Histogram.Count[i][3] = 0;
   }

   if (error) {
      ctx->Histogram.Width = 0;
      ctx->Histogram.Format = 0;
      ctx->Histogram.RedSize       = 0;
      ctx->Histogram.GreenSize     = 0;
      ctx->Histogram.BlueSize      = 0;
      ctx->Histogram.AlphaSize     = 0;
      ctx->Histogram.LuminanceSize = 0;
   }
   else {
      ctx->Histogram.Width = width;
      ctx->Histogram.Format = internalFormat;
      ctx->Histogram.Sink = sink;
      ctx->Histogram.RedSize       = 8 * sizeof(GLuint);
      ctx->Histogram.GreenSize     = 8 * sizeof(GLuint);
      ctx->Histogram.BlueSize      = 8 * sizeof(GLuint);
      ctx->Histogram.AlphaSize     = 8 * sizeof(GLuint);
      ctx->Histogram.LuminanceSize = 8 * sizeof(GLuint);
   }

   ctx->NewState |= _NEW_PIXEL;
}


void GLAPIENTRY
_mesa_Minmax(GLenum target, GLenum internalFormat, GLboolean sink)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glMinmax");
      return;
   }

   if (target != GL_MINMAX) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glMinMax(target)");
      return;
   }

   if (base_histogram_format(internalFormat) < 0) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glMinMax(internalFormat)");
      return;
   }

   if (ctx->MinMax.Sink == sink)
      return;
   FLUSH_VERTICES(ctx, _NEW_PIXEL);
   ctx->MinMax.Sink = sink;
}


void GLAPIENTRY
_mesa_ResetHistogram(GLenum target)
{
   GLuint i;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* sideeffects */

   if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glResetHistogram");
      return;
   }

   if (target != GL_HISTOGRAM) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glResetHistogram(target)");
      return;
   }

   for (i = 0; i < HISTOGRAM_TABLE_SIZE; i++) {
      ctx->Histogram.Count[i][0] = 0;
      ctx->Histogram.Count[i][1] = 0;
      ctx->Histogram.Count[i][2] = 0;
      ctx->Histogram.Count[i][3] = 0;
   }

   ctx->NewState |= _NEW_PIXEL;
}


void GLAPIENTRY
_mesa_ResetMinmax(GLenum target)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (!ctx->Extensions.EXT_histogram && !ctx->Extensions.ARB_imaging) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glResetMinmax");
      return;
   }

   if (target != GL_MINMAX) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glResetMinMax(target)");
      return;
   }

   ctx->MinMax.Min[RCOMP] = 1000;    ctx->MinMax.Max[RCOMP] = -1000;
   ctx->MinMax.Min[GCOMP] = 1000;    ctx->MinMax.Max[GCOMP] = -1000;
   ctx->MinMax.Min[BCOMP] = 1000;    ctx->MinMax.Max[BCOMP] = -1000;
   ctx->MinMax.Min[ACOMP] = 1000;    ctx->MinMax.Max[ACOMP] = -1000;
   ctx->NewState |= _NEW_PIXEL;
}



/**********************************************************************/
/*****                      Initialization                        *****/
/**********************************************************************/

void _mesa_init_histogram( GLcontext * ctx )
{
   int i;

   /* Histogram group */
   ctx->Histogram.Width = 0;
   ctx->Histogram.Format = GL_RGBA;
   ctx->Histogram.Sink = GL_FALSE;
   ctx->Histogram.RedSize       = 0;
   ctx->Histogram.GreenSize     = 0;
   ctx->Histogram.BlueSize      = 0;
   ctx->Histogram.AlphaSize     = 0;
   ctx->Histogram.LuminanceSize = 0;
   for (i = 0; i < HISTOGRAM_TABLE_SIZE; i++) {
      ctx->Histogram.Count[i][0] = 0;
      ctx->Histogram.Count[i][1] = 0;
      ctx->Histogram.Count[i][2] = 0;
      ctx->Histogram.Count[i][3] = 0;
   }

   /* Min/Max group */
   ctx->MinMax.Format = GL_RGBA;
   ctx->MinMax.Sink = GL_FALSE;
   ctx->MinMax.Min[RCOMP] = 1000;    ctx->MinMax.Max[RCOMP] = -1000;
   ctx->MinMax.Min[GCOMP] = 1000;    ctx->MinMax.Max[GCOMP] = -1000;
   ctx->MinMax.Min[BCOMP] = 1000;    ctx->MinMax.Max[BCOMP] = -1000;
   ctx->MinMax.Min[ACOMP] = 1000;    ctx->MinMax.Max[ACOMP] = -1000;
}