osmesa.c

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

      }
   }
}



/**
 * Don't use _mesa_delete_renderbuffer since we can't free rb->Data.
 */
static void
osmesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
   _mesa_free(rb);
}


/**
 * Allocate renderbuffer storage.  We don't actually allocate any storage
 * since we're using a user-provided buffer.
 * Just set up all the gl_renderbuffer methods.
 */
static GLboolean
osmesa_renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                            GLenum internalFormat, GLuint width, GLuint height)
{
   const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
   GLint bpc; /* bits per channel */

   if (rb->DataType == GL_UNSIGNED_BYTE)
      bpc = 8;
   else if (rb->DataType == GL_UNSIGNED_SHORT)
      bpc = 16;
   else
      bpc = 32;

   rb->RedBits =
   rb->GreenBits =
   rb->BlueBits =
   rb->AlphaBits = bpc;

   /* Note: we can ignoring internalFormat for "window-system" renderbuffers */
   (void) internalFormat;

   if (osmesa->format == OSMESA_RGBA) {
      if (rb->DataType == GL_UNSIGNED_BYTE) {
         rb->GetRow = get_row_RGBA8;
         rb->GetValues = get_values_RGBA8;
         rb->PutRow = put_row_RGBA8;
         rb->PutRowRGB = put_row_rgb_RGBA8;
         rb->PutMonoRow = put_mono_row_RGBA8;
         rb->PutValues = put_values_RGBA8;
         rb->PutMonoValues = put_mono_values_RGBA8;
      }
      else if (rb->DataType == GL_UNSIGNED_SHORT) {
         rb->GetRow = get_row_RGBA16;
         rb->GetValues = get_values_RGBA16;
         rb->PutRow = put_row_RGBA16;
         rb->PutRowRGB = put_row_rgb_RGBA16;
         rb->PutMonoRow = put_mono_row_RGBA16;
         rb->PutValues = put_values_RGBA16;
         rb->PutMonoValues = put_mono_values_RGBA16;
      }
      else {
         rb->GetRow = get_row_RGBA32;
         rb->GetValues = get_values_RGBA32;
         rb->PutRow = put_row_RGBA32;
         rb->PutRowRGB = put_row_rgb_RGBA32;
         rb->PutMonoRow = put_mono_row_RGBA32;
         rb->PutValues = put_values_RGBA32;
         rb->PutMonoValues = put_mono_values_RGBA32;
      }
      rb->RedBits = rb->GreenBits = rb->BlueBits = rb->AlphaBits = bpc;
   }
   else if (osmesa->format == OSMESA_BGRA) {
      if (rb->DataType == GL_UNSIGNED_BYTE) {
         rb->GetRow = get_row_BGRA8;
         rb->GetValues = get_values_BGRA8;
         rb->PutRow = put_row_BGRA8;
         rb->PutRowRGB = put_row_rgb_BGRA8;
         rb->PutMonoRow = put_mono_row_BGRA8;
         rb->PutValues = put_values_BGRA8;
         rb->PutMonoValues = put_mono_values_BGRA8;
      }
      else if (rb->DataType == GL_UNSIGNED_SHORT) {
         rb->GetRow = get_row_BGRA16;
         rb->GetValues = get_values_BGRA16;
         rb->PutRow = put_row_BGRA16;
         rb->PutRowRGB = put_row_rgb_BGRA16;
         rb->PutMonoRow = put_mono_row_BGRA16;
         rb->PutValues = put_values_BGRA16;
         rb->PutMonoValues = put_mono_values_BGRA16;
      }
      else {
         rb->GetRow = get_row_BGRA32;
         rb->GetValues = get_values_BGRA32;
         rb->PutRow = put_row_BGRA32;
         rb->PutRowRGB = put_row_rgb_BGRA32;
         rb->PutMonoRow = put_mono_row_BGRA32;
         rb->PutValues = put_values_BGRA32;
         rb->PutMonoValues = put_mono_values_BGRA32;
      }
      rb->RedBits = rb->GreenBits = rb->BlueBits = rb->AlphaBits = bpc;
   }
   else if (osmesa->format == OSMESA_ARGB) {
      if (rb->DataType == GL_UNSIGNED_BYTE) {
         rb->GetRow = get_row_ARGB8;
         rb->GetValues = get_values_ARGB8;
         rb->PutRow = put_row_ARGB8;
         rb->PutRowRGB = put_row_rgb_ARGB8;
         rb->PutMonoRow = put_mono_row_ARGB8;
         rb->PutValues = put_values_ARGB8;
         rb->PutMonoValues = put_mono_values_ARGB8;
      }
      else if (rb->DataType == GL_UNSIGNED_SHORT) {
         rb->GetRow = get_row_ARGB16;
         rb->GetValues = get_values_ARGB16;
         rb->PutRow = put_row_ARGB16;
         rb->PutRowRGB = put_row_rgb_ARGB16;
         rb->PutMonoRow = put_mono_row_ARGB16;
         rb->PutValues = put_values_ARGB16;
         rb->PutMonoValues = put_mono_values_ARGB16;
      }
      else {
         rb->GetRow = get_row_ARGB32;
         rb->GetValues = get_values_ARGB32;
         rb->PutRow = put_row_ARGB32;
         rb->PutRowRGB = put_row_rgb_ARGB32;
         rb->PutMonoRow = put_mono_row_ARGB32;
         rb->PutValues = put_values_ARGB32;
         rb->PutMonoValues = put_mono_values_ARGB32;
      }
      rb->RedBits = rb->GreenBits = rb->BlueBits = rb->AlphaBits = bpc;
   }
   else if (osmesa->format == OSMESA_RGB) {
      if (rb->DataType == GL_UNSIGNED_BYTE) {
         rb->GetRow = get_row_RGB8;
         rb->GetValues = get_values_RGB8;
         rb->PutRow = put_row_RGB8;
         rb->PutRowRGB = put_row_rgb_RGB8;
         rb->PutMonoRow = put_mono_row_RGB8;
         rb->PutValues = put_values_RGB8;
         rb->PutMonoValues = put_mono_values_RGB8;
      }
      else if (rb->DataType == GL_UNSIGNED_SHORT) {
         rb->GetRow = get_row_RGB16;
         rb->GetValues = get_values_RGB16;
         rb->PutRow = put_row_RGB16;
         rb->PutRowRGB = put_row_rgb_RGB16;
         rb->PutMonoRow = put_mono_row_RGB16;
         rb->PutValues = put_values_RGB16;
         rb->PutMonoValues = put_mono_values_RGB16;
      }
      else {
         rb->GetRow = get_row_RGB32;
         rb->GetValues = get_values_RGB32;
         rb->PutRow = put_row_RGB32;
         rb->PutRowRGB = put_row_rgb_RGB32;
         rb->PutMonoRow = put_mono_row_RGB32;
         rb->PutValues = put_values_RGB32;
         rb->PutMonoValues = put_mono_values_RGB32;
      }
      rb->RedBits = rb->GreenBits = rb->BlueBits = bpc;
   }
   else if (osmesa->format == OSMESA_BGR) {
      if (rb->DataType == GL_UNSIGNED_BYTE) {
         rb->GetRow = get_row_BGR8;
         rb->GetValues = get_values_BGR8;
         rb->PutRow = put_row_BGR8;
         rb->PutRowRGB = put_row_rgb_BGR8;
         rb->PutMonoRow = put_mono_row_BGR8;
         rb->PutValues = put_values_BGR8;
         rb->PutMonoValues = put_mono_values_BGR8;
      }
      else if (rb->DataType == GL_UNSIGNED_SHORT) {
         rb->GetRow = get_row_BGR16;
         rb->GetValues = get_values_BGR16;
         rb->PutRow = put_row_BGR16;
         rb->PutRowRGB = put_row_rgb_BGR16;
         rb->PutMonoRow = put_mono_row_BGR16;
         rb->PutValues = put_values_BGR16;
         rb->PutMonoValues = put_mono_values_BGR16;
      }
      else {
         rb->GetRow = get_row_BGR32;
         rb->GetValues = get_values_BGR32;
         rb->PutRow = put_row_BGR32;
         rb->PutRowRGB = put_row_rgb_BGR32;
         rb->PutMonoRow = put_mono_row_BGR32;
         rb->PutValues = put_values_BGR32;
         rb->PutMonoValues = put_mono_values_BGR32;
      }
      rb->RedBits = rb->GreenBits = rb->BlueBits = bpc;
   }
   else if (osmesa->format == OSMESA_RGB_565) {
      ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
      rb->GetRow = get_row_RGB_565;
      rb->GetValues = get_values_RGB_565;
      rb->PutRow = put_row_RGB_565;
      rb->PutRowRGB = put_row_rgb_RGB_565;
      rb->PutMonoRow = put_mono_row_RGB_565;
      rb->PutValues = put_values_RGB_565;
      rb->PutMonoValues = put_mono_values_RGB_565;
      rb->RedBits = 5;
      rb->GreenBits = 6;
      rb->BlueBits = 5;
   }
   else if (osmesa->format == OSMESA_COLOR_INDEX) {
      rb->GetRow = get_row_CI;
      rb->GetValues = get_values_CI;
      rb->PutRow = put_row_CI;
      rb->PutMonoRow = put_mono_row_CI;
      rb->PutValues = put_values_CI;
      rb->PutMonoValues = put_mono_values_CI;
      rb->IndexBits = 8;
   }
   else {
      _mesa_problem(ctx, "bad pixel format in osmesa renderbuffer_storage");
   }

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

   compute_row_addresses( osmesa );

   return GL_TRUE;
}


/**
 * Allocate a new renderbuffer to describe the user-provided color buffer.
 */
static struct gl_renderbuffer *
new_osmesa_renderbuffer(GLcontext *ctx, GLenum format, GLenum type)
{
   const GLuint name = 0;
   struct gl_renderbuffer *rb = _mesa_new_renderbuffer(ctx, name);
   if (rb) {
      rb->RefCount = 1;
      rb->Delete = osmesa_delete_renderbuffer;
      rb->AllocStorage = osmesa_renderbuffer_storage;

      if (format == OSMESA_COLOR_INDEX) {
         rb->InternalFormat = GL_COLOR_INDEX;
         rb->_ActualFormat = GL_COLOR_INDEX8_EXT;
         rb->_BaseFormat = GL_COLOR_INDEX;
         rb->DataType = GL_UNSIGNED_BYTE;
      }
      else {
         rb->InternalFormat = GL_RGBA;
         rb->_ActualFormat = GL_RGBA;
         rb->_BaseFormat = GL_RGBA;
         rb->DataType = type;
      }
   }
   return rb;
}


/**********************************************************************/
/*****                    Public Functions                        *****/
/**********************************************************************/


/**
 * Create an Off-Screen Mesa rendering context.  The only attribute needed is
 * an RGBA vs Color-Index mode flag.
 *
 * Input:  format - either GL_RGBA or GL_COLOR_INDEX
 *         sharelist - specifies another OSMesaContext with which to share
 *                     display lists.  NULL indicates no sharing.
 * Return:  an OSMesaContext or 0 if error
 */
GLAPI OSMesaContext GLAPIENTRY
OSMesaCreateContext( GLenum format, OSMesaContext sharelist )
{
   const GLint accumBits = (format == OSMESA_COLOR_INDEX) ? 0 : 16;
   return OSMesaCreateContextExt(format, DEFAULT_SOFTWARE_DEPTH_BITS,
                                 8, accumBits, sharelist);
}



/**
 * New in Mesa 3.5
 *
 * Create context and specify size of ancillary buffers.
 */
GLAPI OSMesaContext GLAPIENTRY
OSMesaCreateContextExt( GLenum format, GLint depthBits, GLint stencilBits,
                        GLint accumBits, OSMesaContext sharelist )
{
   OSMesaContext osmesa;
   struct dd_function_table functions;
   GLint rind, gind, bind, aind;
   GLint indexBits = 0, redBits = 0, greenBits = 0, blueBits = 0, alphaBits =0;
   GLboolean rgbmode;
   GLenum type = CHAN_TYPE;

   rind = gind = bind = aind = 0;
   if (format==OSMESA_COLOR_INDEX) {
      indexBits = 8;
      rgbmode = GL_FALSE;
   }
   else if (format==OSMESA_RGBA) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = CHAN_BITS;
      rind = 0;
      gind = 1;
      bind = 2;
      aind = 3;
      rgbmode = GL_TRUE;
   }
   else if (format==OSMESA_BGRA) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = CHAN_BITS;
      bind = 0;
      gind = 1;
      rind = 2;
      aind = 3;
      rgbmode = GL_TRUE;
   }
   else if (format==OSMESA_ARGB) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = CHAN_BITS;
      aind = 0;
      rind = 1;
      gind = 2;
      bind = 3;
      rgbmode = GL_TRUE;
   }
   else if (format==OSMESA_RGB) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = 0;
      rind = 0;
      gind = 1;
      bind = 2;
      rgbmode = GL_TRUE;
   }
   else if (format==OSMESA_BGR) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = 0;
      rind = 2;
      gind = 1;
      bind = 0;
      rgbmode = GL_TRUE;
   }
#if CHAN_TYPE == GL_UNSIGNED_BYTE
   else if (format==OSMESA_RGB_565) {
      indexBits = 0;
      redBits = 5;
      greenBits = 6;
      blueBits = 5;
      alphaBits = 0;
      rind = 0; /* not used */
      gind = 0;
      bind = 0;
      rgbmode = GL_TRUE;
   }
#endif
   else {
      return NULL;
   }

   osmesa = (OSMesaContext) CALLOC_STRUCT(osmesa_context);
   if (osmesa) {
      osmesa->gl_visual = _mesa_create_visual( rgbmode,
                                               GL_FALSE,    /* double buffer */
                                               GL_FALSE,    /* stereo */
                                               redBits,
                                               greenBits,
                                               blueBits,
                                               alphaBits,
                                               indexBits,
                                               depthBits,
                                               stencilBits,
                                               accumBits,
                                               accumBits,
                                               accumBits,
                                               alphaBits ? accumBits : 0,
                                               1            /* num samples */
                                               );
      if (!osmesa->gl_visual) {
         _mesa_free(osmesa);
         return NULL;
      }

      /* Initialize device driver function table */
      _mesa_init_driver_functions(&functions);