vbo_save_api.c

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

/* Called only when buffers are wrapped as the result of filling the
 * vertex_store struct.  
 */
static void _save_wrap_filled_vertex( GLcontext *ctx )
{
   struct vbo_save_context *save = &vbo_context(ctx)->save;
   GLfloat *data = save->copied.buffer;
   GLuint i;

   /* Emit a glEnd to close off the last vertex list.
    */
   _save_wrap_buffers( ctx );
   
    /* Copy stored stored vertices to start of new list.
    */
   assert(save->max_vert - save->vert_count > save->copied.nr);

   for (i = 0 ; i < save->copied.nr ; i++) {
      _mesa_memcpy( save->vbptr, data, save->vertex_size * sizeof(GLfloat));
      data += save->vertex_size;
      save->vbptr += save->vertex_size;
      save->vert_count++;
   }
}


static void _save_copy_to_current( GLcontext *ctx )
{
   struct vbo_save_context *save = &vbo_context(ctx)->save; 
   GLuint i;

   for (i = VBO_ATTRIB_POS+1 ; i < VBO_ATTRIB_MAX ; i++) {
      if (save->attrsz[i]) {
	 save->currentsz[i][0] = save->attrsz[i];
	 COPY_CLEAN_4V(save->current[i], 
		       save->attrsz[i], 
		       save->attrptr[i]);
      }
   }
}


static void _save_copy_from_current( GLcontext *ctx )
{
   struct vbo_save_context *save = &vbo_context(ctx)->save; 
   GLint i;

   for (i = VBO_ATTRIB_POS+1 ; i < VBO_ATTRIB_MAX ; i++) {
      switch (save->attrsz[i]) {
      case 4: save->attrptr[i][3] = save->current[i][3];
      case 3: save->attrptr[i][2] = save->current[i][2];
      case 2: save->attrptr[i][1] = save->current[i][1];
      case 1: save->attrptr[i][0] = save->current[i][0];
      case 0: break;
      }
   }
}




/* Flush existing data, set new attrib size, replay copied vertices.
 */ 
static void _save_upgrade_vertex( GLcontext *ctx, 
				 GLuint attr,
				 GLuint newsz )
{
   struct vbo_save_context *save = &vbo_context(ctx)->save;
   GLuint oldsz;
   GLuint i;
   GLfloat *tmp;

   /* Store the current run of vertices, and emit a GL_END.  Emit a
    * BEGIN in the new buffer.
    */
   if (save->vert_count) 
      _save_wrap_buffers( ctx );
   else
      assert( save->copied.nr == 0 );

   /* Do a COPY_TO_CURRENT to ensure back-copying works for the case
    * when the attribute already exists in the vertex and is having
    * its size increased.  
    */
   _save_copy_to_current( ctx );

   /* Fix up sizes:
    */
   oldsz = save->attrsz[attr];
   save->attrsz[attr] = newsz;

   save->vertex_size += newsz - oldsz;
   save->max_vert = ((VBO_SAVE_BUFFER_SIZE - save->vertex_store->used) / 
		      save->vertex_size);
   save->vert_count = 0;

   /* Recalculate all the attrptr[] values:
    */
   for (i = 0, tmp = save->vertex ; i < VBO_ATTRIB_MAX ; i++) {
      if (save->attrsz[i]) {
	 save->attrptr[i] = tmp;
	 tmp += save->attrsz[i];
      }
      else 
	 save->attrptr[i] = NULL; /* will not be dereferenced. */
   }

   /* Copy from current to repopulate the vertex with correct values.
    */
   _save_copy_from_current( ctx );

   /* Replay stored vertices to translate them to new format here.
    *
    * If there are copied vertices and the new (upgraded) attribute
    * has not been defined before, this list is somewhat degenerate,
    * and will need fixup at runtime.
    */
   if (save->copied.nr)
   {
      GLfloat *data = save->copied.buffer;
      GLfloat *dest = save->buffer;
      GLuint j;

      /* Need to note this and fix up at runtime (or loopback):
       */
      if (attr != VBO_ATTRIB_POS && save->currentsz[attr][0] == 0) {
	 assert(oldsz == 0);
	 save->dangling_attr_ref = GL_TRUE;
      }

      for (i = 0 ; i < save->copied.nr ; i++) {
	 for (j = 0 ; j < VBO_ATTRIB_MAX ; j++) {
	    if (save->attrsz[j]) {
	       if (j == attr) {
		  if (oldsz) {
		     COPY_CLEAN_4V( dest, oldsz, data );
		     data += oldsz;
		     dest += newsz;
		  }
		  else {
		     COPY_SZ_4V( dest, newsz, save->current[attr] );
		     dest += newsz;
		  }
	       }
	       else {
		  GLint sz = save->attrsz[j];
		  COPY_SZ_4V( dest, sz, data );
		  data += sz;
		  dest += sz;
	       }
	    }
	 }
      }

      save->vbptr = dest;
      save->vert_count += save->copied.nr;
   }
}

static void save_fixup_vertex( GLcontext *ctx, GLuint attr, GLuint sz )
{
   struct vbo_save_context *save = &vbo_context(ctx)->save; 

   if (sz > save->attrsz[attr]) {
      /* New size is larger.  Need to flush existing vertices and get
       * an enlarged vertex format.
       */
      _save_upgrade_vertex( ctx, attr, sz );
   }
   else if (sz < save->active_sz[attr]) {
      static GLfloat id[4] = { 0, 0, 0, 1 };
      GLuint i;

      /* New size is equal or smaller - just need to fill in some
       * zeros.
       */
      for (i = sz ; i <= save->attrsz[attr] ; i++)
	 save->attrptr[attr][i-1] = id[i-1];
   }

   save->active_sz[attr] = sz;
}

static void _save_reset_vertex( GLcontext *ctx )
{
   struct vbo_save_context *save = &vbo_context(ctx)->save;
   GLuint i;

   for (i = 0 ; i < VBO_ATTRIB_MAX ; i++) {
      save->attrsz[i] = 0;
      save->active_sz[i] = 0;
   }
      
   save->vertex_size = 0;
}



#define ERROR()   _mesa_compile_error( ctx, GL_INVALID_ENUM, __FUNCTION__ );


/* Only one size for each attribute may be active at once.  Eg. if
 * Color3f is installed/active, then Color4f may not be, even if the
 * vertex actually contains 4 color coordinates.  This is because the
 * 3f version won't otherwise set color[3] to 1.0 -- this is the job
 * of the chooser function when switching between Color4f and Color3f.
 */
#define ATTR( A, N, V0, V1, V2, V3 )				\
do {								\
   struct vbo_save_context *save = &vbo_context(ctx)->save;	\
								\
   if (save->active_sz[A] != N)				\
      save_fixup_vertex(ctx, A, N);				\
								\
   {								\
      GLfloat *dest = save->attrptr[A];			\
      if (N>0) dest[0] = V0;					\
      if (N>1) dest[1] = V1;					\
      if (N>2) dest[2] = V2;					\
      if (N>3) dest[3] = V3;					\
   }								\
								\
   if ((A) == 0) {						\
      GLuint i;							\
								\
      for (i = 0; i < save->vertex_size; i++)			\
	 save->vbptr[i] = save->vertex[i];			\
								\
      save->vbptr += save->vertex_size;				\
								\
      if (++save->vert_count >= save->max_vert)			\
	 _save_wrap_filled_vertex( ctx );			\
   }								\
} while (0)

#define TAG(x) _save_##x

#include "vbo_attrib_tmp.h"




/* Cope with EvalCoord/CallList called within a begin/end object:
 *     -- Flush current buffer
 *     -- Fallback to opcodes for the rest of the begin/end object.
 */
#define DO_FALLBACK(ctx) 							\
do {									\
   struct vbo_save_context *save = &vbo_context(ctx)->save;					\
									\
   if (save->vert_count || save->prim_count) 						\
      _save_compile_vertex_list( ctx );					\
									\
   _save_copy_to_current( ctx );					\
   _save_reset_vertex( ctx );						\
   _save_reset_counters( ctx );  \
   _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );	\
   ctx->Driver.SaveNeedFlush = 0;					\
} while (0)

static void GLAPIENTRY _save_EvalCoord1f( GLfloat u )
{
   GET_CURRENT_CONTEXT(ctx);
   DO_FALLBACK(ctx);
   ctx->Save->EvalCoord1f( u );
}

static void GLAPIENTRY _save_EvalCoord1fv( const GLfloat *v )
{
   GET_CURRENT_CONTEXT(ctx);
   DO_FALLBACK(ctx);
   ctx->Save->EvalCoord1fv( v );
}

static void GLAPIENTRY _save_EvalCoord2f( GLfloat u, GLfloat v )
{
   GET_CURRENT_CONTEXT(ctx);
   DO_FALLBACK(ctx);
   ctx->Save->EvalCoord2f( u, v );
}

static void GLAPIENTRY _save_EvalCoord2fv( const GLfloat *v )
{
   GET_CURRENT_CONTEXT(ctx);
   DO_FALLBACK(ctx);
   ctx->Save->EvalCoord2fv( v );
}

static void GLAPIENTRY _save_EvalPoint1( GLint i )
{
   GET_CURRENT_CONTEXT(ctx);
   DO_FALLBACK(ctx);
   ctx->Save->EvalPoint1( i );
}

static void GLAPIENTRY _save_EvalPoint2( GLint i, GLint j )
{
   GET_CURRENT_CONTEXT(ctx);
   DO_FALLBACK(ctx);
   ctx->Save->EvalPoint2( i, j );
}

static void GLAPIENTRY _save_CallList( GLuint l )
{
   GET_CURRENT_CONTEXT(ctx);
   DO_FALLBACK(ctx);
   ctx->Save->CallList( l );
}

static void GLAPIENTRY _save_CallLists( GLsizei n, GLenum type, const GLvoid *v )
{
   GET_CURRENT_CONTEXT(ctx);
   DO_FALLBACK(ctx);
   ctx->Save->CallLists( n, type, v );
}




/* This begin is hooked into ...  Updating of
 * ctx->Driver.CurrentSavePrimitive is already taken care of.
 */
GLboolean vbo_save_NotifyBegin( GLcontext *ctx, GLenum mode )
{
   struct vbo_save_context *save = &vbo_context(ctx)->save; 

   GLuint i = save->prim_count++;

   assert(i < save->prim_max);
   save->prim[i].mode = mode & ~VBO_SAVE_PRIM_WEAK;
   save->prim[i].begin = 1;
   save->prim[i].end = 0;
   save->prim[i].weak = (mode & VBO_SAVE_PRIM_WEAK) ? 1 : 0;
   save->prim[i].pad = 0;
   save->prim[i].start = save->vert_count;
   save->prim[i].count = 0;   

   _mesa_install_save_vtxfmt( ctx, &save->vtxfmt );      
   ctx->Driver.SaveNeedFlush = 1;
   return GL_TRUE;
}



static void GLAPIENTRY _save_End( void )
{
   GET_CURRENT_CONTEXT( ctx ); 
   struct vbo_save_context *save = &vbo_context(ctx)->save; 
   GLint i = save->prim_count - 1;

   ctx->Driver.CurrentSavePrimitive = PRIM_OUTSIDE_BEGIN_END;
   save->prim[i].end = 1;
   save->prim[i].count = (save->vert_count - 
			  save->prim[i].start);

   if (i == (GLint) save->prim_max - 1) {
      _save_compile_vertex_list( ctx );
      assert(save->copied.nr == 0);
   }

   /* Swap out this vertex format while outside begin/end.  Any color,
    * etc. received between here and the next begin will be compiled
    * as opcodes.
    */   
   _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
}


/* These are all errors as this vtxfmt is only installed inside
 * begin/end pairs.
 */
static void GLAPIENTRY _save_DrawElements(GLenum mode, GLsizei count, GLenum type,
			       const GLvoid *indices)
{
   GET_CURRENT_CONTEXT(ctx);
   (void) mode; (void) count; (void) type; (void) indices;
   _mesa_compile_error( ctx, GL_INVALID_OPERATION, "glDrawElements" );
}


static void GLAPIENTRY _save_DrawRangeElements(GLenum mode,
				    GLuint start, GLuint end,
				    GLsizei count, GLenum type,
				    const GLvoid *indices)
{
   GET_CURRENT_CONTEXT(ctx);
   (void) mode; (void) start; (void) end; (void) count; (void) type; (void) indices;
   _mesa_compile_error( ctx, GL_INVALID_OPERATION, "glDrawRangeElements" );
}

static void GLAPIENTRY _save_DrawArrays(GLenum mode, GLint start, GLsizei count)
{
   GET_CURRENT_CONTEXT(ctx);
   (void) mode; (void) start; (void) count;
   _mesa_compile_error( ctx, GL_INVALID_OPERATION, "glDrawArrays" );
}