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/***************************************************************************
OpenGLVisitor.cpp - description
-------------------
begin : Sat Jan 6 2001
copyright : (C) 2001 by Henrik Enqvist
email : henqvist@excite.com
***************************************************************************/
#include "Private.h"
#include "OpenGLVisitor.h"
#include "Group.h"
#include "Shape3D.h"
#include "Polygon.h"
#include "BillBoard.h"
#include "Config.h"
#ifndef EM_VERTEXARRAY
#define EM_VERTEXARRAY 0
#endif
#ifndef EM_OPENGL_LIGHTS
#define EM_OPENGL_LIGHTS 0
#endif
/* Optimization observations:
* * Voodoo 3 System
* glVertex3f is a bit fatser than glVertex3fv ~3%.
* glVertex3f is faster then glVertexArray ~10-20%, really strange.
*/
OpenGLVisitor * OpenGLVisitor::p_OpenGLVisitor = NULL;
int OpenGLVisitor::m_iPoly = 0;
OpenGLVisitor::OpenGLVisitor(){
m_iMode = EM_GL_GCOL_TEX;
m_bOffset = false;
}
OpenGLVisitor::~OpenGLVisitor(){
p_OpenGLVisitor = NULL;
}
OpenGLVisitor * OpenGLVisitor::getInstance() {
if (p_OpenGLVisitor == NULL) {
p_OpenGLVisitor = new OpenGLVisitor();
}
return p_OpenGLVisitor;
}
void OpenGLVisitor::empty() {
#if EM_USE_SDL
#if EM_VERTEXARRAY
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
#endif
switch (m_iMode) {
case EM_GL_GCOL_TEX: {
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
//glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
glDisable(GL_ALPHA_TEST);
glDepthMask(GL_TRUE);
} break;
case EM_GL_GCOL_TEX_TRANS: {
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
//glDisable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDepthMask(GL_FALSE);
// glEnable(GL_ALPHA_TEST);
// glAlphaFunc(GL_GREATER, 0.05);
} break;
case EM_GL_CLEAN: {
#if EM_DEBUG
m_iPoly = 0;
#endif
glDisable(GL_DEPTH_TEST);
glDisable(GL_ALPHA_TEST);
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
} break;
}
#endif
}
void OpenGLVisitor::visit(Group* g) {
#if EM_USE_SDL
int filter = Config::getInstance()->getGLFilter();
//bool lights = Config::getInstance()->useLights();
switch (m_iMode) {
case EM_GL_GCOL_TEX: {
// shapes
vector<Shape3D*>::iterator shapeIter = g->m_vShape3D.begin();
vector<Shape3D*>::iterator shapeEnd = g->m_vShape3D.end();
for ( ; shapeIter != shapeEnd; shapeIter++) {
if (EM_SHAPE3D_HIDDEN & (*shapeIter)->m_iProperties) continue;
if ((*shapeIter)->m_iProperties & EM_SHAPE3D_BEHIND) {
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(1.0, 1.0);
} else if ((*shapeIter)->m_iProperties & EM_SHAPE3D_BEHIND2) {
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(1.0, 2.0);
} else {
glDisable(GL_POLYGON_OFFSET_FILL);
}
if ((*shapeIter)->m_Texture != NULL && filter != -1) { // textured polygons
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, *((*shapeIter)->m_Texture));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
if ((*shapeIter)->m_iProperties & EM_SHAPE3D_ALWAYSLIT) { // EM_SHAPE3D_ALWAYSLIT
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; ++polyIter) {
if ((*polyIter)->m_iProperties & EM_POLY_TRANS) continue;
#if EM_DEBUG
++m_iPoly;
#endif
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_POLYGON);
for ( ; indexIter != indexEnd; ++indexIter) {
glTexCoord2f((*shapeIter)->m_vTexCoord[(*indexIter)].u,
(*shapeIter)->m_vTexCoord[(*indexIter)].v);
glColor3f((*shapeIter)->m_vColor[(*indexIter)].r,
(*shapeIter)->m_vColor[(*indexIter)].g,
(*shapeIter)->m_vColor[(*indexIter)].b);
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
} else { // ! EM_SHAPE3D_ALWAYSLIT
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; ++polyIter) {
if ((*polyIter)->m_iProperties & EM_POLY_TRANS) continue;
#if EM_DEBUG
++m_iPoly;
#endif
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_POLYGON);
for ( ; indexIter != indexEnd; ++indexIter) {
glTexCoord2f((*shapeIter)->m_vTexCoord[(*indexIter)].u,
(*shapeIter)->m_vTexCoord[(*indexIter)].v);
// Question should textured polygons have specular?
glColor3f((*shapeIter)->m_vLight[(*indexIter)].r,
(*shapeIter)->m_vLight[(*indexIter)].g,
(*shapeIter)->m_vLight[(*indexIter)].b);
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
}
} else { // if ((*shapeIter)->m_Texture... // color polygons
glDisable(GL_TEXTURE_2D);
// if statement moved outside for loop for performance
if ((*shapeIter)->m_iProperties & EM_SHAPE3D_ALWAYSLIT) { // EM_SHAPE3D_ALWAYSLIT
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; ++polyIter) {
if ((*polyIter)->m_iProperties & EM_POLY_TRANS) continue;
#if EM_DEBUG
++m_iPoly;
#endif
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_POLYGON);
for (; indexIter != indexEnd; ++indexIter) {
glColor3f((*shapeIter)->m_vColor[(*indexIter)].r,
(*shapeIter)->m_vColor[(*indexIter)].g,
(*shapeIter)->m_vColor[(*indexIter)].b);
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
} else { // ! EM_SHAPE3D_ALWAYSLIT
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; ++polyIter) {
if ((*polyIter)->m_iProperties & EM_POLY_TRANS) continue;
#if EM_DEBUG
++m_iPoly;
#endif
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_POLYGON);
for (; indexIter != indexEnd; ++indexIter) {
glColor3f((*shapeIter)->m_vLitColor[(*indexIter)].r,
(*shapeIter)->m_vLitColor[(*indexIter)].g,
(*shapeIter)->m_vLitColor[(*indexIter)].b);
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
}
}
}
// billboard
BillBoard * b = g->p_BillBoard;
if (b != NULL && !(b->m_iProperties & EM_BILLBOARD_TRANS)) {
EmAssert(b->m_Texture != NULL, "all billboards must have a texture");
glBindTexture(GL_TEXTURE_2D, *(b->m_Texture));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
// a textured polygon
glColor3f(1, 1, 1);
glBegin(GL_POLYGON);
glTexCoord2f(0, 0);
glVertex3f(b->m_vtxAlign.x - b->m_fSizexD2,
b->m_vtxAlign.y + b->m_fSizeyD2,
b->m_vtxAlign.z);
glTexCoord2f(1, 0);
glVertex3f(b->m_vtxAlign.x + b->m_fSizexD2,
b->m_vtxAlign.y + b->m_fSizeyD2,
b->m_vtxAlign.z);
glTexCoord2f(1, 1);
glVertex3f(b->m_vtxAlign.x + b->m_fSizexD2,
b->m_vtxAlign.y - b->m_fSizeyD2,
b->m_vtxAlign.z);
glTexCoord2f(0, 1);
glVertex3f(b->m_vtxAlign.x - b->m_fSizexD2,
b->m_vtxAlign.y - b->m_fSizeyD2,
b->m_vtxAlign.z);
glEnd();
EM_COUT_D("OpenGLVisitor::visit() BillBoard at " << b->m_vtxAlign.x <<" "<<
b->m_vtxAlign.y <<" "<< b->m_vtxAlign.z, 0);
}
} break;
case EM_GL_GCOL_TEX_TRANS: {
vector<Shape3D*>::iterator shapeIter = g->m_vShape3D.begin();
vector<Shape3D*>::iterator shapeEnd = g->m_vShape3D.end();
for ( ; shapeIter != shapeEnd; shapeIter++) {
if (EM_SHAPE3D_HIDDEN & (*shapeIter)->m_iProperties) continue;
if (!(EM_SHAPE3D_USE_TRANS & (*shapeIter)->m_iProperties)) continue;
#if 0 // I used wireframes when showing some demos in school
{
// wireframe
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(1.0, -1.0);
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; ++polyIter) {
++m_iPoly;
glColor3f(0.0f, 0.0f, 0.0f);
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_LINE_LOOP);
for ( ; indexIter != indexEnd; ++indexIter) {
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
glDisable(GL_POLYGON_OFFSET_FILL);
}
#endif
if ((*shapeIter)->m_iProperties & EM_SHAPE3D_BEHIND) {
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(1.0, 1.0);
} else if ((*shapeIter)->m_iProperties & EM_SHAPE3D_BEHIND2) {
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(1.0, 2.0);
} else {
glDisable(GL_POLYGON_OFFSET_FILL);
}
if ((*shapeIter)->m_Texture != NULL && filter != -1) { // textured polygon
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, *((*shapeIter)->m_Texture));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
if ((*shapeIter)->m_iProperties & EM_SHAPE3D_ALWAYSLIT) { // EM_SHAPE3D_ALWAYSLIT
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; polyIter++) {
if (!((*polyIter)->m_iProperties & EM_POLY_TRANS)) continue;
#if EM_DEBUG
++m_iPoly;
#endif
// textured polygon
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_POLYGON);
for ( ; indexIter != indexEnd; indexIter++) {
glTexCoord2f((*shapeIter)->m_vTexCoord[(*indexIter)].u,
(*shapeIter)->m_vTexCoord[(*indexIter)].v);
glColor4f((*shapeIter)->m_vColor[(*indexIter)].r,
(*shapeIter)->m_vColor[(*indexIter)].g,
(*shapeIter)->m_vColor[(*indexIter)].b,
(*shapeIter)->m_vColor[(*indexIter)].a);
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
} else { // ! EM_SHAPE3D_ALWAYSLIT
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; polyIter++) {
if (!((*polyIter)->m_iProperties & EM_POLY_TRANS)) continue;
#if EM_DEBUG
++m_iPoly;
#endif
// textured polygon
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_POLYGON);
for ( ; indexIter != indexEnd; indexIter++) {
glTexCoord2f((*shapeIter)->m_vTexCoord[(*indexIter)].u,
(*shapeIter)->m_vTexCoord[(*indexIter)].v);
glColor4f((*shapeIter)->m_vLight[(*indexIter)].r,
(*shapeIter)->m_vLight[(*indexIter)].g,
(*shapeIter)->m_vLight[(*indexIter)].b,
(*shapeIter)->m_vLight[(*indexIter)].a);
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
}
} else { // color polygon
glDisable(GL_TEXTURE_2D);
if ((*shapeIter)->m_iProperties & EM_SHAPE3D_ALWAYSLIT) {
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; polyIter++) {
if (!((*polyIter)->m_iProperties & EM_POLY_TRANS)) continue;
#if EM_DEBUG
++m_iPoly;
#endif
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_POLYGON);
for ( ; indexIter != indexEnd; indexIter++) {
// transparent polygons should not be lit, or ?
glColor4f((*shapeIter)->m_vColor[(*indexIter)].r,
(*shapeIter)->m_vColor[(*indexIter)].g,
(*shapeIter)->m_vColor[(*indexIter)].b,
(*shapeIter)->m_vColor[(*indexIter)].a);
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
} else { // EM_SHAPE3D_ALWAYSLIT
vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
for ( ; polyIter != polyEnd; polyIter++) {
if (!((*polyIter)->m_iProperties & EM_POLY_TRANS)) continue;
#if EM_DEBUG
++m_iPoly;
#endif
vector<int>::iterator indexIter = (*polyIter)->m_vIndex.begin();
vector<int>::iterator indexEnd = (*polyIter)->m_vIndex.end();
glBegin(GL_POLYGON);
for ( ; indexIter != indexEnd; indexIter++) {
// transparent polygons should not be lit, or ?
glColor4f((*shapeIter)->m_vLitColor[(*indexIter)].r,
(*shapeIter)->m_vLitColor[(*indexIter)].g,
(*shapeIter)->m_vLitColor[(*indexIter)].b,
(*shapeIter)->m_vLitColor[(*indexIter)].a);
glVertex3f((*shapeIter)->m_vVtxAlign[(*indexIter)].x,
(*shapeIter)->m_vVtxAlign[(*indexIter)].y,
(*shapeIter)->m_vVtxAlign[(*indexIter)].z);
}
glEnd();
}
}
}
}
// billboard
BillBoard * b = g->p_BillBoard;
if (b != NULL && b->m_iProperties & EM_BILLBOARD_TRANS) {
EmAssert(b->m_Texture != NULL, "all billboards must have a texture");
glBindTexture(GL_TEXTURE_2D, *(b->m_Texture));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
// a textured polygon
glColor3f(1, 1, 1);
glBegin(GL_POLYGON);
glTexCoord2f(0, 0);
glVertex3f(b->m_vtxAlign.x - b->m_fSizexD2,
b->m_vtxAlign.y + b->m_fSizeyD2,
b->m_vtxAlign.z);
glTexCoord2f(1, 0);
glVertex3f(b->m_vtxAlign.x + b->m_fSizexD2,
b->m_vtxAlign.y + b->m_fSizeyD2,
b->m_vtxAlign.z);
glTexCoord2f(1, 1);
glVertex3f(b->m_vtxAlign.x + b->m_fSizexD2,
b->m_vtxAlign.y - b->m_fSizeyD2,
b->m_vtxAlign.z);
glTexCoord2f(0, 1);
glVertex3f(b->m_vtxAlign.x - b->m_fSizexD2,
b->m_vtxAlign.y - b->m_fSizeyD2,
b->m_vtxAlign.z);
glEnd();
EM_COUT_D("OpenGLVisitor::visit() BillBoard at " << b->m_vtxAlign.x <<" "<<
b->m_vtxAlign.y <<" "<< b->m_vtxAlign.z, 0);
}
} break;
}
#endif // EM_USE_SDL
}
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