renderbuffer.c

winNT技术操作系统,国外开放的原代码和LIUX一样

   case GL_RGBA:
   case GL_RGBA2:
   case GL_RGBA4:
   case GL_RGB5_A1:
   case GL_RGBA8:
      rb->_BaseFormat = GL_RGBA;
      rb->DataType = GL_UNSIGNED_BYTE;
      rb->GetPointer = get_pointer_ubyte4;
      rb->GetRow = get_row_ubyte4;
      rb->GetValues = get_values_ubyte4;
      rb->PutRow = put_row_ubyte4;
      rb->PutRowRGB = put_row_rgb_ubyte4;
      rb->PutMonoRow = put_mono_row_ubyte4;
      rb->PutValues = put_values_ubyte4;
      rb->PutMonoValues = put_mono_values_ubyte4;
      rb->ComponentSizes[0] = 8 * sizeof(GLubyte);
      rb->ComponentSizes[1] = 8 * sizeof(GLubyte);
      rb->ComponentSizes[2] = 8 * sizeof(GLubyte);
      rb->ComponentSizes[3] = 8 * sizeof(GLubyte);
      pixelSize = 4 * sizeof(GLubyte);
      break;
   case GL_RGB10_A2:
   case GL_RGBA12:
   case GL_RGBA16:
      rb->_BaseFormat = GL_RGBA;
      rb->DataType = GL_UNSIGNED_SHORT;
      rb->GetPointer = get_pointer_ushort4;
      rb->GetRow = get_row_ushort4;
      rb->GetValues = get_values_ushort4;
      rb->PutRow = put_row_ushort4;
      rb->PutRowRGB = put_row_rgb_ushort4;
      rb->PutMonoRow = put_mono_row_ushort4;
      rb->PutValues = put_values_ushort4;
      rb->PutMonoValues = put_mono_values_ushort4;
      rb->ComponentSizes[0] = 8 * sizeof(GLushort);
      rb->ComponentSizes[1] = 8 * sizeof(GLushort);
      rb->ComponentSizes[2] = 8 * sizeof(GLushort);
      rb->ComponentSizes[3] = 8 * sizeof(GLushort);
      pixelSize = 4 * sizeof(GLushort);
      break;
#if 00
   case ALPHA8:
      rb->_BaseFormat = GL_RGBA; /* Yes, not GL_ALPHA! */
      rb->DataType = GL_UNSIGNED_BYTE;
      rb->GetPointer = get_pointer_alpha8;
      rb->GetRow = get_row_alpha8;
      rb->GetValues = get_values_alpha8;
      rb->PutRow = put_row_alpha8;
      rb->PutRowRGB = NULL;
      rb->PutMonoRow = put_mono_row_alpha8;
      rb->PutValues = put_values_alpha8;
      rb->PutMonoValues = put_mono_values_alpha8;
      rb->ComponentSizes[0] = 0; /*red*/
      rb->ComponentSizes[1] = 0; /*green*/
      rb->ComponentSizes[2] = 0; /*blue*/
      rb->ComponentSizes[3] = 8 * sizeof(GLubyte);
      pixelSize = sizeof(GLubyte);
      break;
#endif
   case GL_STENCIL_INDEX:
   case GL_STENCIL_INDEX1_EXT:
   case GL_STENCIL_INDEX4_EXT:
   case GL_STENCIL_INDEX8_EXT:
      rb->_BaseFormat = GL_STENCIL_INDEX;
      rb->DataType = GL_UNSIGNED_BYTE;
      rb->GetPointer = get_pointer_ubyte;
      rb->GetRow = get_row_ubyte;
      rb->GetValues = get_values_ubyte;
      rb->PutRow = put_row_ubyte;
      rb->PutRowRGB = NULL;
      rb->PutMonoRow = put_mono_row_ubyte;
      rb->PutValues = put_values_ubyte;
      rb->PutMonoValues = put_mono_values_ubyte;
      rb->ComponentSizes[0] = 8 * sizeof(GLubyte);
      pixelSize = sizeof(GLubyte);
      break;
   case GL_STENCIL_INDEX16_EXT:
      rb->_BaseFormat = GL_STENCIL_INDEX;
      rb->DataType = GL_UNSIGNED_SHORT;
      rb->GetPointer = get_pointer_ushort;
      rb->GetRow = get_row_ushort;
      rb->GetValues = get_values_ushort;
      rb->PutRow = put_row_ushort;
      rb->PutRowRGB = NULL;
      rb->PutMonoRow = put_mono_row_ushort;
      rb->PutValues = put_values_ushort;
      rb->PutMonoValues = put_mono_values_ushort;
      rb->ComponentSizes[0] = 8 * sizeof(GLushort);
      pixelSize = sizeof(GLushort);
      break;
   case GL_DEPTH_COMPONENT:
   case GL_DEPTH_COMPONENT16:
      rb->_BaseFormat = GL_DEPTH_COMPONENT;
      rb->DataType = GL_UNSIGNED_SHORT;
      rb->GetPointer = get_pointer_ushort;
      rb->GetRow = get_row_ushort;
      rb->GetValues = get_values_ushort;
      rb->PutRow = put_row_ushort;
      rb->PutRowRGB = NULL;
      rb->PutMonoRow = put_mono_row_ushort;
      rb->PutValues = put_values_ushort;
      rb->PutMonoValues = put_mono_values_ushort;
      rb->ComponentSizes[0] = 8 * sizeof(GLushort);
      pixelSize = sizeof(GLushort);
      break;
   case GL_DEPTH_COMPONENT24:
   case GL_DEPTH_COMPONENT32:
      rb->_BaseFormat = GL_DEPTH_COMPONENT;
      rb->DataType = GL_UNSIGNED_INT;
      rb->GetPointer = get_pointer_uint;
      rb->GetRow = get_row_uint;
      rb->GetValues = get_values_uint;
      rb->PutRow = put_row_uint;
      rb->PutRowRGB = NULL;
      rb->PutMonoRow = put_mono_row_uint;
      rb->PutValues = put_values_uint;
      rb->PutMonoValues = put_mono_values_uint;
      rb->ComponentSizes[0] = 8 * sizeof(GLuint);
      pixelSize = sizeof(GLuint);
      break;
   case GL_COLOR_INDEX8_EXT:
      rb->_BaseFormat = GL_COLOR_INDEX;
      rb->DataType = GL_UNSIGNED_BYTE;
      rb->GetPointer = get_pointer_ubyte;
      rb->GetRow = get_row_ubyte;
      rb->GetValues = get_values_ubyte;
      rb->PutRow = put_row_ubyte;
      rb->PutRowRGB = NULL;
      rb->PutMonoRow = put_mono_row_ubyte;
      rb->PutValues = put_values_ubyte;
      rb->PutMonoValues = put_mono_values_ubyte;
      rb->ComponentSizes[0] = 8 * sizeof(GLubyte);
      pixelSize = sizeof(GLubyte);
      break;
   case GL_COLOR_INDEX16_EXT:
      rb->_BaseFormat = GL_COLOR_INDEX;
      rb->DataType = GL_UNSIGNED_SHORT;
      rb->GetPointer = get_pointer_ushort;
      rb->GetRow = get_row_ushort;
      rb->GetValues = get_values_ushort;
      rb->PutRow = put_row_ushort;
      rb->PutRowRGB = NULL;
      rb->PutMonoRow = put_mono_row_ushort;
      rb->PutValues = put_values_ushort;
      rb->PutMonoValues = put_mono_values_ushort;
      rb->ComponentSizes[0] = 8 * sizeof(GLushort);
      pixelSize = sizeof(GLushort);
      break;
   case COLOR_INDEX32:
      rb->_BaseFormat = GL_COLOR_INDEX;
      rb->DataType = GL_UNSIGNED_INT;
      rb->GetPointer = get_pointer_uint;
      rb->GetRow = get_row_uint;
      rb->GetValues = get_values_uint;
      rb->PutRow = put_row_uint;
      rb->PutRowRGB = NULL;
      rb->PutMonoRow = put_mono_row_uint;
      rb->PutValues = put_values_uint;
      rb->PutMonoValues = put_mono_values_uint;
      rb->ComponentSizes[0] = 8 * sizeof(GLuint);
      pixelSize = sizeof(GLuint);
      break;
   default:
      _mesa_problem(ctx, "Bad internalFormat in soft_renderbuffer_storage");
      return GL_FALSE;
   }

   ASSERT(rb->DataType);
   ASSERT(rb->GetPointer);
   ASSERT(rb->GetRow);
   ASSERT(rb->GetValues);
   ASSERT(rb->PutRow);
   ASSERT(rb->PutMonoRow);
   ASSERT(rb->PutValues);
   ASSERT(rb->PutMonoValues);
   ASSERT(rb->ComponentSizes[0] > 0);

   /* free old buffer storage */
   if (rb->Data)
      _mesa_free(rb->Data);

   /* allocate new buffer storage */
   rb->Data = _mesa_malloc(width * height * pixelSize);
   if (rb->Data == NULL) {
      rb->Width = 0;
      rb->Height = 0;
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "software renderbuffer allocation");
      return GL_FALSE;
   }

   rb->Width = width;
   rb->Height = height;
   rb->InternalFormat = internalFormat;

   return GL_TRUE;
}


/**********************************************************************/
/**********************************************************************/
/**********************************************************************/


/**
 * Here we utilize the gl_renderbuffer->Wrapper field to put an alpha
 * buffer wrapper around an existing RGB renderbuffer (hw or sw).
 *
 * When PutRow is called (for example), we store the alpha values in
 * this buffer, then pass on the PutRow call to the wrapped RGB
 * buffer.
 */


static GLboolean
alloc_storage_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb,
                     GLenum internalFormat, GLuint width, GLuint height)
{
   ASSERT(arb != arb->Wrapped);

   /* first, pass the call to the wrapped RGB buffer */
   if (!arb->Wrapped->AllocStorage(ctx, arb->Wrapped, internalFormat,
                                  width, height)) {
      return GL_FALSE;
   }

   /* next, resize my alpha buffer */
   if (arb->Data) {
      _mesa_free(arb->Data);
   }

   arb->Data = _mesa_malloc(width * height * sizeof(GLubyte));
   if (arb->Data == NULL) {
      arb->Width = 0;
      arb->Height = 0;
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "software alpha buffer allocation");
      return GL_FALSE;
   }

   arb->Width = width;
   arb->Height = height;
   arb->InternalFormat = internalFormat;

   return GL_TRUE;
}


/**
 * Delete an alpha_renderbuffer object, as well as the wrapped RGB buffer.
 */
static void
delete_renderbuffer_alpha8(struct gl_renderbuffer *arb)
{
   if (arb->Data) {
      _mesa_free(arb->Data);
   }
   ASSERT(arb->Wrapped);
   ASSERT(arb != arb->Wrapped);
   arb->Wrapped->Delete(arb->Wrapped);
   arb->Wrapped = NULL;
   _mesa_free(arb);
}


static void *
get_pointer_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb,
                   GLint x, GLint y)
{
   return NULL;   /* don't allow direct access! */
}


static void
get_row_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
               GLint x, GLint y, void *values)
{
   /* NOTE: 'values' is RGBA format! */
   const GLubyte *src = (const GLubyte *) arb->Data + y * arb->Width + x;
   GLubyte *dst = (GLubyte *) values;
   GLuint i;
   ASSERT(arb != arb->Wrapped);
   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
   /* first, pass the call to the wrapped RGB buffer */
   arb->Wrapped->GetRow(ctx, arb->Wrapped, count, x, y, values);
   /* second, fill in alpha values from this buffer! */
   for (i = 0; i < count; i++) {
      dst[i * 4 + 3] = src[i];
   }
}


static void
get_values_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
                  const GLint x[], const GLint y[], void *values)
{
   GLubyte *dst = (GLubyte *) values;
   GLuint i;
   ASSERT(arb != arb->Wrapped);
   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
   /* first, pass the call to the wrapped RGB buffer */
   arb->Wrapped->GetValues(ctx, arb->Wrapped, count, x, y, values);
   /* second, fill in alpha values from this buffer! */
   for (i = 0; i < count; i++) {
      const GLubyte *src = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];
      dst[i * 4 + 3] = *src;
   }
}


static void
put_row_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
               GLint x, GLint y, const void *values, const GLubyte *mask)
{
   const GLubyte *src = (const GLubyte *) values;
   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;
   GLuint i;
   ASSERT(arb != arb->Wrapped);
   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
   /* first, pass the call to the wrapped RGB buffer */
   arb->Wrapped->PutRow(ctx, arb->Wrapped, count, x, y, values, mask);
   /* second, store alpha in our buffer */
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         dst[i] = src[i * 4 + 3];
      }
   }
}


static void
put_row_rgb_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
                   GLint x, GLint y, const void *values, const GLubyte *mask)
{
   const GLubyte *src = (const GLubyte *) values;
   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;
   GLuint i;
   ASSERT(arb != arb->Wrapped);
   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
   /* first, pass the call to the wrapped RGB buffer */
   arb->Wrapped->PutRowRGB(ctx, arb->Wrapped, count, x, y, values, mask);
   /* second, store alpha in our buffer */
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         dst[i] = src[i * 4 + 3];
      }
   }
}


static void
put_mono_row_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
                    GLint x, GLint y, const void *value, const GLubyte *mask)
{
   const GLubyte val = ((const GLubyte *) value)[3];
   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;
   ASSERT(arb != arb->Wrapped);
   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
   /* first, pass the call to the wrapped RGB buffer */
   arb->Wrapped->PutMonoRow(ctx, arb->Wrapped, count, x, y, value, mask);
   /* second, store alpha in our buffer */
   if (mask) {
      GLuint i;
      for (i = 0; i < count; i++) {
         if (mask[i]) {
            dst[i] = val;
         }
      }
   }
   else {
      _mesa_memset(dst, val, count);
   }
}


static void
put_values_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
                  const GLint x[], const GLint y[],
                  const void *values, const GLubyte *mask)
{
   const GLubyte *src = (const GLubyte *) values;
   GLuint i;
   ASSERT(arb != arb->Wrapped);
   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
   /* first, pass the call to the wrapped RGB buffer */
   arb->Wrapped->PutValues(ctx, arb->Wrapped, count, x, y, values, mask);
   /* second, store alpha in our buffer */
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         GLubyte *dst = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];
         *dst = src[i * 4 + 3];
      }
   }
}


static void
put_mono_values_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb,
                       GLuint count, const GLint x[], const GLint y[],
                       const void *value, const GLubyte *mask)
{
   const GLubyte val = ((const GLubyte *) value)[3];
   GLuint i;
   ASSERT(arb != arb->Wrapped);
   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
   /* first, pass the call to the wrapped RGB buffer */
   arb->Wrapped->PutValues(ctx, arb->Wrapped, count, x, y, value, mask);
   /* second, store alpha in our buffer */
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         GLubyte *dst = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];
         *dst = val;
      }
   }
}



/**********************************************************************/
/**********************************************************************/
/**********************************************************************/


/**
 * Default GetPointer routine.  Always return NULL to indicate that
 * direct buffer access is not supported.
 */
static void *
nop_get_pointer(GLcontext *ctx, struct gl_renderbuffer *rb, GLint x, GLint y)
{
   return NULL;
}


/**
 * Initialize the fields of a gl_renderbuffer to default values.
 */
void
_mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)
{
   rb->Name = name;
   rb->RefCount = 1;
   rb->Delete = _mesa_delete_renderbuffer;

   /* The rest of these should be set later by the caller of this function or
    * the AllocStorage method:
    */
   rb->AllocStorage = NULL;

   rb->Width = 0;
   rb->Height = 0;
   rb->InternalFormat = GL_NONE;
   rb->_BaseFormat = GL_NONE;
   rb->DataType = GL_NONE;
   rb->ComponentSizes[0] = 0;
   rb->ComponentSizes[1] = 0;
   rb->ComponentSizes[2] = 0;
   rb->ComponentSizes[3] = 0;
   rb->Data = NULL;

   /* Point back to ourself so that we don't have to check for Wrapped==NULL
    * all over the drivers.
    */
   rb->Wrapped = rb;

   rb->GetPointer = nop_get_pointer;
   rb->GetRow = NULL;
   rb->GetValues = NULL;
   rb->PutRow = NULL;
   rb->PutRowRGB = NULL;