depthstencil.c

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

              const GLint x[], const GLint y[], void *values)
{
   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
   GLuint temp[MAX_WIDTH], i;
   GLubyte *dst = (GLubyte *) values;
   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
   ASSERT(dsrb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
   ASSERT(count <= MAX_WIDTH);
   /* don't bother trying direct access */
   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
   for (i = 0; i < count; i++) {
      dst[i] = temp[i] & 0xff;
   }
}

static void
put_row_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
           GLint x, GLint y, const void *values, const GLubyte *mask)
{
   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
   const GLubyte *src = (const GLubyte *) values;
   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
   ASSERT(dsrb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
   if (dst) {
      /* direct access */
      GLuint i;
      for (i = 0; i < count; i++) {
         if (!mask || mask[i]) {
            dst[i] = (dst[i] & 0xffffff00) | src[i];
         }
      }
   }
   else {
      /* get, modify, put */
      GLuint temp[MAX_WIDTH], i;
      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
      for (i = 0; i < count; i++) {
         if (!mask || mask[i]) {
            temp[i] = (temp[i] & 0xffffff00) | src[i];
         }
      }
      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
   }
}

static void
put_mono_row_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
                GLint x, GLint y, const void *value, const GLubyte *mask)
{
   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
   const GLubyte val = *((GLubyte *) value);
   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
   ASSERT(dsrb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
   if (dst) {
      /* direct access */
      GLuint i;
      for (i = 0; i < count; i++) {
         if (!mask || mask[i]) {
            dst[i] = (dst[i] & 0xffffff00) | val;
         }
      }
   }
   else {
      /* get, modify, put */
      GLuint temp[MAX_WIDTH], i;
      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
      for (i = 0; i < count; i++) {
         if (!mask || mask[i]) {
            temp[i] = (temp[i] & 0xffffff00) | val;
         }
      }
      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
   }
}

static void
put_values_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
              const GLint x[], const GLint y[],
              const void *values, const GLubyte *mask)
{
   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
   const GLubyte *src = (const GLubyte *) values;
   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
   ASSERT(dsrb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {
      /* direct access */
      GLuint i;
      for (i = 0; i < count; i++) {
         if (!mask || mask[i]) {
            GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
            *dst = (*dst & 0xffffff00) | src[i];
         }
      }
   }
   else {
      /* get, modify, put */
      GLuint temp[MAX_WIDTH], i;
      dsrb->GetValues(ctx, dsrb, count, x, y, temp);
      for (i = 0; i < count; i++) {
         if (!mask || mask[i]) {
            temp[i] = (temp[i] & 0xffffff00) | src[i];
         }
      }
      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
   }
}

static void
put_mono_values_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
                   const GLint x[], const GLint y[],
                   const void *value, const GLubyte *mask)
{
   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
   GLuint temp[MAX_WIDTH], i;
   const GLubyte val = *((GLubyte *) value);
   /* get, modify, put */
   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         temp[i] = (temp[i] & 0xffffff) | val;
      }
   }
   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
}


/**
 * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like
 * a stencil renderbuffer.
 * \return new stencil renderbuffer
 */
struct gl_renderbuffer *
_mesa_new_s8_renderbuffer_wrapper(GLcontext *ctx, struct gl_renderbuffer *dsrb)
{
   struct gl_renderbuffer *s8rb;

   ASSERT(dsrb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);

   s8rb = _mesa_new_renderbuffer(ctx, 0);
   if (!s8rb)
      return NULL;

   s8rb->Wrapped = dsrb;
   s8rb->Name = dsrb->Name;
   s8rb->RefCount = 1;
   s8rb->Width = dsrb->Width;
   s8rb->Height = dsrb->Height;
   s8rb->InternalFormat = GL_STENCIL_INDEX8_EXT;
   s8rb->_ActualFormat = GL_STENCIL_INDEX8_EXT;
   s8rb->_BaseFormat = GL_STENCIL_INDEX;
   s8rb->DataType = GL_UNSIGNED_BYTE;
   s8rb->StencilBits = 8;
   s8rb->Data = NULL;
   s8rb->Delete = delete_wrapper;
   s8rb->AllocStorage = alloc_wrapper_storage;
   s8rb->GetPointer = nop_get_pointer;
   s8rb->GetRow = get_row_s8;
   s8rb->GetValues = get_values_s8;
   s8rb->PutRow = put_row_s8;
   s8rb->PutRowRGB = NULL;
   s8rb->PutMonoRow = put_mono_row_s8;
   s8rb->PutValues = put_values_s8;
   s8rb->PutMonoValues = put_mono_values_s8;

   return s8rb;
}



/**
 ** The following functions are useful for hardware drivers that only
 ** implement combined depth/stencil buffers.
 ** The GL_EXT_framebuffer_object extension allows indepedent depth and
 ** stencil buffers to be used in any combination.
 ** Therefore, we sometimes have to merge separate depth and stencil
 ** renderbuffers into a single depth+stencil renderbuffer.  And sometimes
 ** we have to split combined depth+stencil renderbuffers into separate
 ** renderbuffers.
 **/


/**
 * Extract stencil values from the combined depth/stencil renderbuffer, storing
 * the values into a separate stencil renderbuffer.
 * \param dsRb  the source depth/stencil renderbuffer
 * \param stencilRb  the destination stencil renderbuffer
 *                   (either 8-bit or 32-bit)
 */
void
_mesa_extract_stencil(GLcontext *ctx,
                      struct gl_renderbuffer *dsRb,
                      struct gl_renderbuffer *stencilRb)
{
   GLuint row, width, height;

   ASSERT(dsRb);
   ASSERT(stencilRb);

   ASSERT(dsRb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
   ASSERT(dsRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
   ASSERT(stencilRb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT ||
          stencilRb->_ActualFormat == GL_STENCIL_INDEX8_EXT);
   ASSERT(dsRb->Width == stencilRb->Width);
   ASSERT(dsRb->Height == stencilRb->Height);

   width = dsRb->Width;
   height = dsRb->Height;

   for (row = 0; row < height; row++) {
      GLuint depthStencil[MAX_WIDTH];
      dsRb->GetRow(ctx, dsRb, width, 0, row, depthStencil);
      if (stencilRb->_ActualFormat == GL_STENCIL_INDEX8_EXT) {
         /* 8bpp stencil */
         GLubyte stencil[MAX_WIDTH];
         GLuint i;
         for (i = 0; i < width; i++) {
            stencil[i] = depthStencil[i] & 0xff;
         }
         stencilRb->PutRow(ctx, stencilRb, width, 0, row, stencil, NULL);
      }
      else {
         /* 32bpp stencil */
         /* the 24 depth bits will be ignored */
         ASSERT(stencilRb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
         ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
         stencilRb->PutRow(ctx, stencilRb, width, 0, row, depthStencil, NULL);
      }
   }
}


/**
 * Copy stencil values from a stencil renderbuffer into a combined
 * depth/stencil renderbuffer.
 * \param dsRb  the destination depth/stencil renderbuffer
 * \param stencilRb  the source stencil buffer (either 8-bit or 32-bit)
 */
void
_mesa_insert_stencil(GLcontext *ctx,
                     struct gl_renderbuffer *dsRb,
                     struct gl_renderbuffer *stencilRb)
{
   GLuint row, width, height;

   ASSERT(dsRb);
   ASSERT(stencilRb);

   ASSERT(dsRb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
   ASSERT(dsRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
   ASSERT(stencilRb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT ||
          stencilRb->_ActualFormat == GL_STENCIL_INDEX8_EXT);

   ASSERT(dsRb->Width == stencilRb->Width);
   ASSERT(dsRb->Height == stencilRb->Height);

   width = dsRb->Width;
   height = dsRb->Height;

   for (row = 0; row < height; row++) {
      GLuint depthStencil[MAX_WIDTH];

      dsRb->GetRow(ctx, dsRb, width, 0, row, depthStencil);

      if (stencilRb->_ActualFormat == GL_STENCIL_INDEX8_EXT) {
         /* 8bpp stencil */
         GLubyte stencil[MAX_WIDTH];
         GLuint i;
         stencilRb->GetRow(ctx, stencilRb, width, 0, row, stencil);
         for (i = 0; i < width; i++) {
            depthStencil[i] = (depthStencil[i] & 0xffffff00) | stencil[i];
         }
      }
      else {
         /* 32bpp stencil buffer */
         GLuint stencil[MAX_WIDTH], i;
         ASSERT(stencilRb->_ActualFormat == GL_DEPTH24_STENCIL8_EXT);
         ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
         stencilRb->GetRow(ctx, stencilRb, width, 0, row, stencil);
         for (i = 0; i < width; i++) {
            depthStencil[i]
               = (depthStencil[i] & 0xffffff00) | (stencil[i] & 0xff);
         }
      }

      dsRb->PutRow(ctx, dsRb, width, 0, row, depthStencil, NULL);
   }
}


/**
 * Convert the stencil buffer from 8bpp to 32bpp depth/stencil.
 * \param stencilRb  the stencil renderbuffer to promote
 */
void
_mesa_promote_stencil(GLcontext *ctx, struct gl_renderbuffer *stencilRb)
{
   const GLsizei width = stencilRb->Width;
   const GLsizei height = stencilRb->Height;
   GLubyte *data;
   GLint i, j, k;

   ASSERT(stencilRb->_ActualFormat == GL_STENCIL_INDEX8_EXT);
   ASSERT(stencilRb->Data);

   data = (GLubyte *) stencilRb->Data;
   stencilRb->Data = NULL;
   stencilRb->AllocStorage(ctx, stencilRb, GL_DEPTH24_STENCIL8_EXT,
                           width, height);

   ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);

   k = 0;
   for (i = 0; i < height; i++) {
      GLuint depthStencil[MAX_WIDTH];
      for (j = 0; j < width; j++) {
         depthStencil[j] = data[k++];
      }
      stencilRb->PutRow(ctx, stencilRb, width, 0, i, depthStencil, NULL);
   }
   _mesa_free(data);

   stencilRb->_BaseFormat = GL_DEPTH_STENCIL_EXT;
}