/**
* Draws the heightfield represented by this tree
* Returns teh number of triangles rendered (not including multipass
*/
int quadsquare::Render( const quadcornerdata &cd, const Vector &camvec )
{
quadsquare::camerapos = camvec;
vertices->LoadDrawState();
vertices->BeginDrawState( GFXFALSE );
int totsize = 0;
RenderAux( cd, GFX_PARTIALLY_VISIBLE );
vecTextureIndex::iterator i = indices.begin();
vecTextureStar::iterator k;
for (k = textures->begin(); k != textures->end(); i++, k++) {
TerrainMakeActive( *k );
unsigned int isize = (*i).q.size();
totsize += isize;
vertices->Draw( GFXTRI, isize, (*i).q.begin() );
TerrainMakeDeactive( *k );
}
vertices->EndDrawState();
i = indices.begin();
int j = 0;
for (k = textures->begin(); k != textures->end(); i++, j++, k++) {
if ( (*i).c.size() > 2 ) {
TerrainMakeClearActive( *k );
GFXPolygonOffset( 0, -j );
GFXColorMaterial( AMBIENT|DIFFUSE );
GFXColorVertex **cv = (&blendVertices->BeginMutate( 0 )->colors);
GFXColorVertex *tmp = *cv;
*cv = (*i).c.begin();
blendVertices->EndMutate( (*i).c.size() );
blendVertices->LoadDrawState();
blendVertices->BeginDrawState( GFXFALSE );
blendVertices->Draw( GFXTRI, (*i).c.size() );
blendVertices->EndDrawState( GFXFALSE );
cv = (&blendVertices->BeginMutate( 0 )->colors);
*cv = tmp;
blendVertices->EndMutate( 3 );
GFXColorMaterial( 0 );
GFXPolygonOffset( 0, 0 );
TerrainMakeDeactive( *k );
}
(*i).Clear();
}
return totsize;
}
void quadsquare::Render(const quadcornerdata& cd, GLubyte *vnc_array)
// Draws the heightfield represented by this tree.
// Returns the number of triangles rendered.
{
VNCArray = vnc_array;
bool_t fog_on;
unsigned int i, j;
int nx, ny;
get_course_divisions( &nx, &ny );
/* Save fog state */
fog_on = is_fog_on();
/*
* Draw the "normal" blended triangles ( <= 2 terrains textures )
*/
for (j=0; j<NumTerrains; j++) {
InitArrayCounters();
RenderAux(cd, SomeClip, j);
if ( VertexArrayCounter == 0 ) {
continue;
}
glBindTexture( GL_TEXTURE_2D, TexId[j] );
DrawTris();
if ( j == Ice && getparam_terrain_envmap() ) {
/* Render Ice with environment map */
glDisableClientState( GL_COLOR_ARRAY );
glColor4f( 1.0, 1.0, 1.0, ENV_MAP_ALPHA / 255.0 );
DrawEnvmapTris();
glEnableClientState( GL_COLOR_ARRAY );
}
}
/*
* Draw the "special" triangles that have different terrain types
* at each of the corners
*/
if ( getparam_terrain_blending() &&
getparam_perfect_terrain_blending() ) {
/*
* Get the "special" three-terrain triangles
*/
InitArrayCounters();
RenderAux( cd, SomeClip, -1 );
if ( VertexArrayCounter != 0 ) {
/* Render black triangles */
glDisable( GL_FOG );
/* Set triangle vertices to black */
for (i=0; i<VertexArrayCounter; i++) {
colorval( VertexArrayIndices[i], 0 ) = 0;
colorval( VertexArrayIndices[i], 1 ) = 0;
colorval( VertexArrayIndices[i], 2 ) = 0;
colorval( VertexArrayIndices[i], 3 ) = 255;
}
/* Draw the black triangles */
glBindTexture( GL_TEXTURE_2D, TexId[0] );
DrawTris();
/* Now we draw the triangle once for each texture */
if (fog_on) {
glEnable( GL_FOG );
}
/* Use additive blend function */
glBlendFunc( GL_SRC_ALPHA, GL_ONE );
/* First set triangle colours to white */
for (i=0; i<VertexArrayCounter; i++) {
colorval( VertexArrayIndices[i], 0 ) = 255;
colorval( VertexArrayIndices[i], 1 ) = 255;
colorval( VertexArrayIndices[i], 2 ) = 255;
}
for (j=0; j<NumTerrains; j++) {
glBindTexture( GL_TEXTURE_2D, TexId[j] );
/* Set alpha values */
for (i=0; i<VertexArrayCounter; i++) {
colorval( VertexArrayIndices[i], 3 ) =
(Terrain[VertexArrayIndices[i]] == (terrain_t)j ) ?
255 : 0;
}
DrawTris();
}
/* Render Ice with environment map */
if ( getparam_terrain_envmap() ) {
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
/* Need to set alpha values for ice */
for (i=0; i<VertexArrayCounter; i++) {
colorval( VertexArrayIndices[i], 3 ) =
(Terrain[VertexArrayIndices[i]] == Ice) ?
ENV_MAP_ALPHA : 0;
}
DrawEnvmapTris();
}
}
}
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
}
