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// ==============================================================
// This file is part of Glest Shared Library (www.glest.org)
//
// Copyright (C) 2001-2008 Martio Figueroa
//
// You can redistribute this code and/or modify it under
// the terms of the GNU General Public License as published
// by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version
// ==============================================================
#include "model_renderer_gl.h"
#include "opengl.h"
#include "gl_wrap.h"
#include "texture_gl.h"
#include "interpolation.h"
#include "leak_dumper.h"
using namespace Shared::Platform;
namespace Shared{ namespace Graphics{ namespace Gl{
// =====================================================
// class MyClass
// =====================================================
// ===================== PUBLIC ========================
ModelRendererGl::ModelRendererGl(){
rendering= false;
duplicateTexCoords= false;
secondaryTexCoordUnit= 1;
}
void ModelRendererGl::begin(bool renderNormals, bool renderTextures, bool renderColors, MeshCallback *meshCallback){
//assertions
assert(!rendering);
assertGl();
this->renderTextures= renderTextures;
this->renderNormals= renderNormals;
this->renderColors= renderColors;
this->meshCallback= meshCallback;
rendering= true;
lastTexture= 0;
glBindTexture(GL_TEXTURE_2D, 0);
//push attribs
glPushAttrib(GL_ENABLE_BIT | GL_LIGHTING_BIT | GL_POLYGON_BIT | GL_CURRENT_BIT | GL_TEXTURE_BIT);
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
//init opengl
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D, 0);
glFrontFace(GL_CCW);
glEnable(GL_NORMALIZE);
glEnable(GL_BLEND);
glEnableClientState(GL_VERTEX_ARRAY);
if(renderNormals){
glEnableClientState(GL_NORMAL_ARRAY);
}
if(renderTextures){
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
}
//assertions
assertGl();
}
void ModelRendererGl::end(){
//assertions
assert(rendering);
assertGl();
//set render state
rendering= false;
//pop
glPopAttrib();
glPopClientAttrib();
//assertions
assertGl();
}
void ModelRendererGl::render(const Model *model){
//assertions
assert(rendering);
assertGl();
//render every mesh
for(uint32 i=0; i<model->getMeshCount(); ++i){
renderMesh(model->getMesh(i));
}
//assertions
assertGl();
}
void ModelRendererGl::renderNormalsOnly(const Model *model){
//assertions
assert(rendering);
assertGl();
//render every mesh
for(uint32 i=0; i<model->getMeshCount(); ++i){
renderMeshNormals(model->getMesh(i));
}
//assertions
assertGl();
}
// ===================== PRIVATE =======================
void ModelRendererGl::renderMesh(const Mesh *mesh){
//assertions
assertGl();
//set cull face
if(mesh->getTwoSided()){
glDisable(GL_CULL_FACE);
}
else{
glEnable(GL_CULL_FACE);
}
//set color
if(renderColors){
Vec4f color(mesh->getDiffuseColor(), mesh->getOpacity());
glColor4fv(color.ptr());
}
//texture state
const Texture2DGl *texture= static_cast<const Texture2DGl*>(mesh->getTexture(mtDiffuse));
if(texture != NULL && renderTextures){
if(lastTexture != texture->getHandle()){
assert(glIsTexture(texture->getHandle()));
glBindTexture(GL_TEXTURE_2D, texture->getHandle());
lastTexture= texture->getHandle();
}
}
else{
glBindTexture(GL_TEXTURE_2D, 0);
lastTexture= 0;
}
if(meshCallback!=NULL){
meshCallback->execute(mesh);
}
//misc vars
uint32 vertexCount= mesh->getVertexCount();
uint32 indexCount= mesh->getIndexCount();
//assertions
assertGl();
//vertices
glVertexPointer(3, GL_FLOAT, 0, mesh->getInterpolationData()->getVertices());
//normals
if(renderNormals){
glEnableClientState(GL_NORMAL_ARRAY);
glNormalPointer(GL_FLOAT, 0, mesh->getInterpolationData()->getNormals());
}
else{
glDisableClientState(GL_NORMAL_ARRAY);
}
//tex coords
if(renderTextures && mesh->getTexture(mtDiffuse)!=NULL ){
if(duplicateTexCoords){
glActiveTexture(GL_TEXTURE0 + secondaryTexCoordUnit);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, mesh->getTexCoords());
}
glActiveTexture(GL_TEXTURE0);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, mesh->getTexCoords());
}
else{
if(duplicateTexCoords){
glActiveTexture(GL_TEXTURE0 + secondaryTexCoordUnit);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
glActiveTexture(GL_TEXTURE0);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
//draw model
glDrawRangeElements(GL_TRIANGLES, 0, vertexCount-1, indexCount, GL_UNSIGNED_INT, mesh->getIndices());
//assertions
assertGl();
}
void ModelRendererGl::renderMeshNormals(const Mesh *mesh){
glBegin(GL_LINES);
for(int i= 0; i<mesh->getIndexCount(); ++i){
Vec3f vertex= mesh->getInterpolationData()->getVertices()[mesh->getIndices()[i]];
Vec3f normal= vertex + mesh->getInterpolationData()->getNormals()[mesh->getIndices()[i]];
glVertex3fv(vertex.ptr());
glVertex3fv(normal.ptr());
}
glEnd();
}
}}}//end namespace
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