polycode-engine/Core/Contents/Source/PolyGLRenderer.cpp

/*
 *  PolyGLRenderer.cpp
 *  TAU
 *
 *  Created by Ivan Safrin on 3/12/08.
 *  Copyright 2008 Ivan Safrin. All rights reserved.
 *
 */

#include "PolyGLRenderer.h"

#ifdef _WINDOWS


PFNGLACTIVETEXTUREPROC   glActiveTexture;
PFNGLMULTITEXCOORD2FPROC glMultiTexCoord2f;
PFNGLMULTITEXCOORD3FPROC glMultiTexCoord3f;


// ARB_vertex_buffer_object
PFNGLBINDBUFFERARBPROC glBindBufferARB;
PFNGLDELETEBUFFERSARBPROC glDeleteBuffersARB;
PFNGLGENBUFFERSARBPROC glGenBuffersARB;
PFNGLISBUFFERARBPROC glIsBufferARB;
PFNGLBUFFERDATAARBPROC glBufferDataARB;
PFNGLBUFFERSUBDATAARBPROC glBufferSubDataARB;
PFNGLGETBUFFERSUBDATAARBPROC glGetBufferSubDataARB;
PFNGLMAPBUFFERARBPROC glMapBufferARB;
PFNGLUNMAPBUFFERARBPROC glUnmapBufferARB;
PFNGLGETBUFFERPARAMETERIVARBPROC glGetBufferParameterivARB;
PFNGLGETBUFFERPOINTERVARBPROC glGetBufferPointervARB;

// GL_EXT_framebuffer_object
PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT;
PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT;
PFNGLDELETERENDERBUFFERSEXTPROC glDeleteRenderbuffersEXT;
PFNGLGENRENDERBUFFERSEXTPROC glGenRenderbuffersEXT;
PFNGLRENDERBUFFERSTORAGEEXTPROC glRenderbufferStorageEXT;
PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC glGetRenderbufferParameterivEXT;
PFNGLISFRAMEBUFFEREXTPROC glIsFramebufferEXT;
PFNGLBINDFRAMEBUFFEREXTPROC glBindFramebufferEXT;
PFNGLDELETEFRAMEBUFFERSEXTPROC glDeleteFramebuffersEXT;
PFNGLGENFRAMEBUFFERSEXTPROC glGenFramebuffersEXT;
PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT;
PFNGLFRAMEBUFFERTEXTURE1DEXTPROC glFramebufferTexture1DEXT;
PFNGLFRAMEBUFFERTEXTURE2DEXTPROC glFramebufferTexture2DEXT;
PFNGLFRAMEBUFFERTEXTURE3DEXTPROC glFramebufferTexture3DEXT;
PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC glFramebufferRenderbufferEXT;
PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC glGetFramebufferAttachmentParameterivEXT;
PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT;

#endif
using namespace Polycode;

OpenGLRenderer::OpenGLRenderer() : Renderer() {

	nearPlane = 0.1f;
	farPlane = 1000.0f;
	verticesToDraw = 0;
	
#ifdef _WINDOWS
	glActiveTexture   = (PFNGLACTIVETEXTUREPROC)wglGetProcAddress("glActiveTexture");
	glMultiTexCoord2f = (PFNGLMULTITEXCOORD2FPROC)wglGetProcAddress("glMultiTexCoord2f");
	glMultiTexCoord3f = (PFNGLMULTITEXCOORD3FPROC)wglGetProcAddress("glMultiTexCoord3f");

   // ARB_vertex_buffer_object
        glBindBufferARB = (PFNGLBINDBUFFERARBPROC)wglGetProcAddress("glBindBufferARB");
        glDeleteBuffersARB = (PFNGLDELETEBUFFERSARBPROC)wglGetProcAddress("glDeleteBuffersARB");
        glGenBuffersARB = (PFNGLGENBUFFERSARBPROC)wglGetProcAddress("glGenBuffersARB");
        glIsBufferARB = (PFNGLISBUFFERARBPROC)wglGetProcAddress("glIsBufferARB");
        glBufferDataARB = (PFNGLBUFFERDATAARBPROC)wglGetProcAddress("glBufferDataARB");
        glBufferSubDataARB = (PFNGLBUFFERSUBDATAARBPROC)wglGetProcAddress("glBufferSubDataARB");
        glGetBufferSubDataARB = (PFNGLGETBUFFERSUBDATAARBPROC)wglGetProcAddress("glGetBufferSubDataARB");
        glMapBufferARB = (PFNGLMAPBUFFERARBPROC)wglGetProcAddress("glMapBufferARB");
        glUnmapBufferARB = (PFNGLUNMAPBUFFERARBPROC)wglGetProcAddress("glUnmapBufferARB");
        glGetBufferParameterivARB = (PFNGLGETBUFFERPARAMETERIVARBPROC)wglGetProcAddress("glGetBufferParameterivARB");
        glGetBufferPointervARB = (PFNGLGETBUFFERPOINTERVARBPROC)wglGetProcAddress("glGetBufferPointervARB");

        glIsRenderbufferEXT = (PFNGLISRENDERBUFFEREXTPROC)wglGetProcAddress("glIsRenderbufferEXT");
        glBindRenderbufferEXT = (PFNGLBINDRENDERBUFFEREXTPROC)wglGetProcAddress("glBindRenderbufferEXT");
        glDeleteRenderbuffersEXT = (PFNGLDELETERENDERBUFFERSEXTPROC)wglGetProcAddress("glDeleteRenderbuffersEXT");
        glGenRenderbuffersEXT = (PFNGLGENRENDERBUFFERSEXTPROC)wglGetProcAddress("glGenRenderbuffersEXT");
        glRenderbufferStorageEXT = (PFNGLRENDERBUFFERSTORAGEEXTPROC)wglGetProcAddress("glRenderbufferStorageEXT");
        glGetRenderbufferParameterivEXT = (PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC)wglGetProcAddress("glGetRenderbufferParameterivEXT");
        glIsFramebufferEXT = (PFNGLISFRAMEBUFFEREXTPROC)wglGetProcAddress("glIsFramebufferEXT");
        glBindFramebufferEXT = (PFNGLBINDFRAMEBUFFEREXTPROC)wglGetProcAddress("glBindFramebufferEXT");
        glDeleteFramebuffersEXT = (PFNGLDELETEFRAMEBUFFERSEXTPROC)wglGetProcAddress("glDeleteFramebuffersEXT");
        glGenFramebuffersEXT = (PFNGLGENFRAMEBUFFERSEXTPROC)wglGetProcAddress("glGenFramebuffersEXT");
        glCheckFramebufferStatusEXT = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)wglGetProcAddress("glCheckFramebufferStatusEXT");
        glFramebufferTexture1DEXT = (PFNGLFRAMEBUFFERTEXTURE1DEXTPROC)wglGetProcAddress("glFramebufferTexture1DEXT");
        glFramebufferTexture2DEXT = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)wglGetProcAddress("glFramebufferTexture2DEXT");
        glFramebufferTexture3DEXT = (PFNGLFRAMEBUFFERTEXTURE3DEXTPROC)wglGetProcAddress("glFramebufferTexture3DEXT");
        glFramebufferRenderbufferEXT = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)wglGetProcAddress("glFramebufferRenderbufferEXT");
        glGetFramebufferAttachmentParameterivEXT = (PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC)wglGetProcAddress("glGetFramebufferAttachmentParameterivEXT");
        glGenerateMipmapEXT = (PFNGLGENERATEMIPMAPEXTPROC)wglGetProcAddress("glGenerateMipmapEXT");

#endif
}

void OpenGLRenderer::Resize(int xRes, int yRes) {
	this->xRes = xRes;
	this->yRes = yRes;
	glClearColor(clearColor.r, clearColor.g, clearColor.b, clearColor.a);
	glClearDepth(1.0f);
	
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
	gluPerspective(fov,(GLfloat)xRes/(GLfloat)yRes,nearPlane,farPlane);
	glViewport(0, 0, xRes, yRes);
	glScissor(0, 0, xRes, yRes);
	
	glMatrixMode(GL_MODELVIEW);
	glLineWidth(1);
	glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
	glEnable(GL_BLEND);
	glShadeModel(GL_SMOOTH);
	glDepthFunc( GL_LEQUAL );
	
	glEnable(GL_DEPTH_TEST);
	
	glLineWidth(1.0f);
	
//	glEnable(GL_LINE_SMOOTH);
	
	GLint numBuffers;
	glGetIntegerv(GL_MAX_DRAW_BUFFERS, &numBuffers);
//	Logger::log("MAX_DRAW_BUFFERS: %d \n", numBuffers);
	
}

void OpenGLRenderer::setDepthFunction(int depthFunction) {
	switch(depthFunction) {
		case DEPTH_FUNCTION_LEQUAL:
			glDepthFunc(GL_LEQUAL);
		break;
		case DEPTH_FUNCTION_GREATER:
			glDepthFunc(GL_GREATER);			
		break;
	}
}

void OpenGLRenderer::enableAlphaTest(bool val) {
	if(val) {
		glAlphaFunc ( GL_GREATER, 0.01) ;
		glEnable ( GL_ALPHA_TEST ) ;		
	} else {
		glDisable( GL_ALPHA_TEST ) ;
	}
}

void OpenGLRenderer::setLineSmooth(bool val) {
	if(val)
		glEnable(GL_LINE_SMOOTH);
	else
		glDisable(GL_LINE_SMOOTH);
}

void OpenGLRenderer::setFOV(Number fov) {
	this->fov = fov;
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(fov,(GLfloat)xRes/(GLfloat)yRes,nearPlane,farPlane);	
	glViewport(0, 0, xRes, yRes);
	glScissor(0, 0, xRes, yRes);
	glMatrixMode(GL_MODELVIEW);	
}

void OpenGLRenderer::setViewportSize(int w, int h, Number fov) {
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(fov,(GLfloat)w/(GLfloat)h,nearPlane,farPlane);
	glViewport(0, 0, w, h);
	glScissor(0, 0, w, h);
	glMatrixMode(GL_MODELVIEW);
}

Vector3 OpenGLRenderer::Unproject(Number x, Number y) {
	Vector3 coords;
	GLfloat wx, wy, wz;
	GLdouble cx, cy, cz;
	
	GLdouble mv[16];
	glGetDoublev( GL_MODELVIEW_MATRIX, mv );
	
	GLdouble proj[16];
	glGetDoublev( GL_PROJECTION_MATRIX, proj );
	
	GLint vp[4];
	glGetIntegerv( GL_VIEWPORT, vp );
	
	wx = ( Number ) x;
	wy = ( Number ) vp[3] - ( Number ) y;
	glReadPixels( x, wy, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &wz );
	
	gluUnProject( wx, wy, wz, mv, proj, vp, &cx, &cy, &cz );
	
	coords = Vector3( cx, cy, cz );
	
	return coords;
	
}

bool OpenGLRenderer::test2DCoordinate(Number x, Number y, Polycode::Polygon *poly, const Matrix4 &matrix, bool billboardMode) {
	GLdouble nearPlane[3],farPlane[3];
	
	GLdouble mv[16];
	Matrix4 camInverse = cameraMatrix.inverse();	
	Matrix4 cmv;
	cmv.identity();
	cmv = cmv * camInverse;
	
	for(int i=0; i < 16; i++) {
		mv[i] = cmv.ml[i];
	}
	
	GLint vp[4];
	glGetIntegerv( GL_VIEWPORT, vp );
	
	gluUnProject(x, yRes - y, 0.0, mv, sceneProjectionMatrix, vp,  &nearPlane[0], &nearPlane[1], &nearPlane[2]);
	gluUnProject(x, yRes - y, 1.0, mv, sceneProjectionMatrix, vp,  &farPlane[0], &farPlane[1], &farPlane[2]);
	
	Vector3 nearVec(nearPlane[0], nearPlane[1], nearPlane[2]);
	Vector3 farVec(farPlane[0], farPlane[1], farPlane[2]);
		
	Vector3 dirVec = farVec - nearVec;	
	dirVec.Normalize();
	
	Vector3 hitPoint;
	
	Matrix4 fullMatrix = matrix;
	
	if(poly->getVertexCount() == 3) {
		return rayTriangleIntersect(Vector3(0,0,0), dirVec, fullMatrix * (*poly->getVertex(0)), fullMatrix  * (*poly->getVertex(1)), fullMatrix *  (*poly->getVertex(2)), &hitPoint);
	} else if(poly->getVertexCount() == 4) {
		return (rayTriangleIntersect(Vector3(0,0,0), dirVec, fullMatrix * (*poly->getVertex(2)), fullMatrix  * (*poly->getVertex(1)), fullMatrix *  (*poly->getVertex(0)), &hitPoint) ||
				rayTriangleIntersect(Vector3(0,0,0), dirVec, fullMatrix * (*poly->getVertex(0)), fullMatrix  * (*poly->getVertex(3)), fullMatrix *  (*poly->getVertex(2)), &hitPoint));
	} else {
		return false;
	}
}

void OpenGLRenderer::enableDepthWrite(bool val) {
	if(val)
		glDepthMask(GL_TRUE);
	else
		glDepthMask(GL_FALSE);	
}

void OpenGLRenderer::enableDepthTest(bool val) {
	if(val)
		glEnable(GL_DEPTH_TEST);
	else
		glDisable(GL_DEPTH_TEST);	
}

void OpenGLRenderer::setModelviewMatrix(Matrix4 m) {
	glLoadMatrixd(m.ml);
}

void OpenGLRenderer::multModelviewMatrix(Matrix4 m) {
//	glMatrixMode(GL_MODELVIEW);
	glMultMatrixd(m.ml);
}

void OpenGLRenderer::enableLighting(bool enable) {
	lightingEnabled = enable;
}

void OpenGLRenderer::setLineSize(Number lineSize) {
	glLineWidth(lineSize);
}

void OpenGLRenderer::createVertexBufferForMesh(Mesh *mesh) {
	OpenGLVertexBuffer *buffer = new OpenGLVertexBuffer(mesh);
	mesh->setVertexBuffer(buffer);
}

void OpenGLRenderer::drawVertexBuffer(VertexBuffer *buffer) {
	OpenGLVertexBuffer *glVertexBuffer = (OpenGLVertexBuffer*)buffer;

	glEnableClientState(GL_VERTEX_ARRAY);		
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnableClientState(GL_NORMAL_ARRAY);	
//	glEnableClientState(GL_COLOR_ARRAY);		
		
//	glBindBufferARB( GL_ARRAY_BUFFER_ARB, glVertexBuffer->getColorBufferID());
//	glTexCoordPointer( 4, GL_FLOAT, 0, (char *) NULL );	
	glBindBufferARB( GL_ARRAY_BUFFER_ARB, glVertexBuffer->getVertexBufferID());
	glVertexPointer( 3, GL_FLOAT, 0, (char *) NULL );	
	glBindBufferARB( GL_ARRAY_BUFFER_ARB, glVertexBuffer->getNormalBufferID());
	glNormalPointer(GL_FLOAT, 0, (char *) NULL );			
	glBindBufferARB( GL_ARRAY_BUFFER_ARB, glVertexBuffer->getTextCoordBufferID());
	glTexCoordPointer( 2, GL_FLOAT, 0, (char *) NULL );
	
	
	GLenum mode = GL_TRIANGLES;
	
	switch(buffer->meshType) {
		case Mesh::TRI_MESH:
			switch(renderMode) {
				case RENDER_MODE_NORMAL:
					mode = GL_TRIANGLES;
					break;
				case RENDER_MODE_WIREFRAME:
					mode = GL_LINE_LOOP;
					break;
			}
			break;
		case Mesh::TRIFAN_MESH:
			switch(renderMode) {
				case RENDER_MODE_NORMAL:
					mode = GL_TRIANGLE_FAN;
					break;
				case RENDER_MODE_WIREFRAME:
					mode = GL_LINE_LOOP;
					break;
			}
			break;
		case Mesh::QUAD_MESH:
			switch(renderMode) {
				case RENDER_MODE_NORMAL:
					mode = GL_QUADS;
					break;
				case RENDER_MODE_WIREFRAME:
					mode = GL_LINE_LOOP;
					break;
			}
			break;
		case Mesh::LINE_MESH:
			mode = GL_LINES;
			break;	
		case Mesh::POINT_MESH:
			mode = GL_POINTS;
			break;
	}	
	
	glDrawArrays( mode, 0, buffer->getVertexCount() );
	
	glDisableClientState( GL_VERTEX_ARRAY);	
	glDisableClientState( GL_TEXTURE_COORD_ARRAY );		
	glDisableClientState( GL_NORMAL_ARRAY );
//	glDisableClientState( GL_COLOR_ARRAY );	
}

void OpenGLRenderer::enableFog(bool enable) {
	if(enable)
		glEnable(GL_FOG);
	else {
		glDisable(GL_FOG);
		glClearColor(clearColor.r, clearColor.g, clearColor.b, clearColor.a);
	}
}

void OpenGLRenderer::setBlendingMode(int blendingMode) {
	switch(blendingMode) {
		case BLEND_MODE_NORMAL:
				glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		break;
		case BLEND_MODE_LIGHTEN:
				glBlendFunc (GL_SRC_ALPHA, GL_ONE);
		break;
		case BLEND_MODE_COLOR:
				glBlendFunc (GL_SRC_ALPHA_SATURATE, GL_ONE);
		break;
		default:
			glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		break;
	}
	glEnable(GL_BLEND);
}

Matrix4 OpenGLRenderer::getProjectionMatrix() {
	Number m[16];
	glGetDoublev( GL_PROJECTION_MATRIX, m);
	return Matrix4(m);
}

Matrix4 OpenGLRenderer::getModelviewMatrix() {
	Number m[16];
    glGetDoublev( GL_MODELVIEW_MATRIX, m);
	return Matrix4(m);
}

void OpenGLRenderer::renderZBufferToTexture(Texture *targetTexture) {
//	OpenGLTexture *glTexture = (OpenGLTexture*)targetTexture;
//	glBindTexture (GL_TEXTURE_2D, glTexture->getTextureID());
//	glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 0, 0, targetTexture->getWidth(), targetTexture->getHeight(), 0);	
}

void OpenGLRenderer::renderToTexture(Texture *targetTexture) {
	OpenGLTexture *glTexture = (OpenGLTexture*)targetTexture;
	glBindTexture (GL_TEXTURE_2D, glTexture->getTextureID());
	glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0, targetTexture->getWidth(), targetTexture->getHeight(), 0);	

}

void OpenGLRenderer::setFogProperties(int fogMode, Color color, Number density, Number startDepth, Number endDepth) {
	switch(fogMode) {
		case FOG_LINEAR:
			glFogi(GL_FOG_MODE, GL_LINEAR);
		break;
		case FOG_EXP:
				glFogi(GL_FOG_MODE, GL_EXP);
		break;
		case FOG_EXP2:
				glFogi(GL_FOG_MODE, GL_EXP2);
		break;
		default:
				glFogi(GL_FOG_MODE, GL_LINEAR);
		break;
	}

	GLfloat fogColor[4]= {color.r, color.g, color.b, color.a};
	glFogfv(GL_FOG_COLOR, fogColor);
	glFogf(GL_FOG_DENSITY, density);
	glHint(GL_FOG_HINT, GL_DONT_CARE);
	glFogf(GL_FOG_START, startDepth);
	glFogf(GL_FOG_END, endDepth);
	glClearColor(color.r, color.g, color.b, color.a);
}


void OpenGLRenderer::_setOrthoMode() {
	if(!orthoMode) {
		glMatrixMode(GL_PROJECTION);
		glPushMatrix();
		glLoadIdentity();
		glOrtho(-1,1,-1,1,nearPlane,farPlane);
		orthoMode = true;
	}
	glMatrixMode(GL_MODELVIEW);	
	glLoadIdentity();	
}

void OpenGLRenderer::setOrthoMode(Number xSize, Number ySize) {
	
	if(xSize == 0)
		xSize = xRes;

	if(ySize == 0)
		ySize = yRes;
		
	setBlendingMode(BLEND_MODE_NORMAL);
	if(!orthoMode) {
		glDisable(GL_LIGHTING);
		glMatrixMode(GL_PROJECTION);
		glDisable(GL_CULL_FACE);
		glPushMatrix();
		glLoadIdentity();
		glOrtho(0.0f,xSize,ySize,0,-1.0f,1.0f);
		orthoMode = true;
	}
	glMatrixMode(GL_MODELVIEW);	
	glLoadIdentity();
}

void OpenGLRenderer::enableBackfaceCulling(bool val) {
	if(val)
		glEnable(GL_CULL_FACE);
	else
		glDisable(GL_CULL_FACE);
}

void OpenGLRenderer::setPerspectiveMode() {
	setBlendingMode(BLEND_MODE_NORMAL);
	if(orthoMode) {
		if(lightingEnabled) {
		}
		glEnable (GL_DEPTH_TEST);
		glEnable(GL_CULL_FACE);
		glMatrixMode( GL_PROJECTION );
		glPopMatrix();
		glMatrixMode( GL_MODELVIEW );
		orthoMode = false;
	}
	glLoadIdentity();
	
	glGetDoublev( GL_PROJECTION_MATRIX, sceneProjectionMatrix);
	currentTexture = NULL;
}

void OpenGLRenderer::BeginRender() {
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	currentTexture = NULL;
}

void OpenGLRenderer::setClearColor(Number r, Number g, Number b) {
	clearColor.setColor(r,g,b,1.0f);	
	glClearColor(r,g,b,0.0f);
}

void OpenGLRenderer::translate3D(Vector3 *position) {
	glTranslatef(position->x, position->y, position->z);
}

void OpenGLRenderer::translate3D(Number x, Number y, Number z) {
	glTranslatef(x, y, z);
}

void OpenGLRenderer::scale3D(Vector3 *scale) {
	glScalef(scale->x, scale->y, scale->z);
}

void OpenGLRenderer::bindFrameBufferTexture(Texture *texture) {
	if(currentFrameBufferTexture) {
		previousFrameBufferTexture = currentFrameBufferTexture;
	}
	OpenGLTexture *glTexture = (OpenGLTexture*)texture;

	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, glTexture->getFrameBufferID());
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	currentFrameBufferTexture = texture;
}

void OpenGLRenderer::unbindFramebuffers() {
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);	
	currentFrameBufferTexture = NULL;
	if(previousFrameBufferTexture) {
		bindFrameBufferTexture(previousFrameBufferTexture);
		previousFrameBufferTexture = NULL;
	}
}


void OpenGLRenderer::createRenderTextures(Texture **colorBuffer, Texture **depthBuffer, int width, int height) {
	
	Logger::log("generating fbo textures %d %d\n", colorBuffer, depthBuffer);	
		
	GLuint depthTexture,colorTexture;
	GLenum status;
	GLuint frameBufferID;
	
	glGenFramebuffersEXT(1, &frameBufferID);   
	
	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, frameBufferID);     	
	glGenTextures(1,&colorTexture);
	glBindTexture(GL_TEXTURE_2D,colorTexture);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);	
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, colorTexture, 0);

	status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
	if(status == GL_FRAMEBUFFER_COMPLETE_EXT) {
		Logger::log("color fbo generation successful\n");
	} else {
		Logger::log("color fbo generation failed\n");	
	}

	if(colorBuffer) {
		OpenGLTexture *colorBufferTexture = new OpenGLTexture(width, height);
		colorBufferTexture->setGLInfo(colorTexture, frameBufferID);
		*colorBuffer = ((Texture*)colorBufferTexture);
	}
	
	if(depthBuffer) {
		glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, frameBufferID);     
		glGenTextures(1,&depthTexture);
		glBindTexture(GL_TEXTURE_2D,depthTexture);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
		glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);

	//	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE,GL_COMPARE_R_TO_TEXTURE);
	//	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);	
		glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_LUMINANCE);	
	
		glTexImage2D(GL_TEXTURE_2D,0,GL_DEPTH_COMPONENT,width,height,0,GL_DEPTH_COMPONENT,GL_UNSIGNED_BYTE,0);
	
		glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, depthTexture, 0);

		status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);

		if(status == GL_FRAMEBUFFER_COMPLETE_EXT) {
			Logger::log("depth fbo generation successful\n");
		} else {
			Logger::log("depth fbo generation failed\n");	
		}
		
		OpenGLTexture *depthBufferTexture = new OpenGLTexture(width, height);
		depthBufferTexture->setGLInfo(depthTexture, frameBufferID);	
		*depthBuffer = ((Texture*)depthBufferTexture);		
	}
	
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}

Texture *OpenGLRenderer::createFramebufferTexture(unsigned int width, unsigned int height) {
	OpenGLTexture *newTexture = new OpenGLTexture(width, height);	
	return newTexture;
}

Cubemap *OpenGLRenderer::createCubemap(Texture *t0, Texture *t1, Texture *t2, Texture *t3, Texture *t4, Texture *t5) {
	OpenGLCubemap *newCubemap = new OpenGLCubemap(t0,t1,t2,t3,t4,t5);
	return newCubemap;
}

Texture *OpenGLRenderer::createTexture(unsigned int width, unsigned int height, char *textureData, bool clamp, int type) {
	OpenGLTexture *newTexture = new OpenGLTexture(width, height, textureData, clamp, textureFilteringMode, type);	
	return newTexture;
}

void OpenGLRenderer::clearScreen() {
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}

void OpenGLRenderer::drawToColorBuffer(bool val) {
	if(val) {
		glDrawBuffer(GL_BACK);
	} else {
		glDrawBuffer(GL_NONE);		
	}
}

void OpenGLRenderer::clearBuffer(bool colorBuffer, bool depthBuffer) {
	GLbitfield clearMask = 0;
	
	if(colorBuffer) {
		clearMask = clearMask | GL_COLOR_BUFFER_BIT;
	} 
	
	if(depthBuffer) {
		clearMask = clearMask | GL_DEPTH_BUFFER_BIT;
	} 
	
	glClear(clearMask);	
}

void OpenGLRenderer::applyMaterial(Material *material,  ShaderBinding *localOptions,unsigned int shaderIndex) {
	if(!material->getShader(shaderIndex) || !shadersEnabled) {
		setTexture(NULL);
		return;
	}

	FixedShaderBinding *fBinding;

	switch(material->getShader(shaderIndex)->getType()) {
		case Shader::FIXED_SHADER:
//			FixedShader *fShader = (FixedShader*)material->getShader();
			fBinding = (FixedShaderBinding*)material->getShaderBinding(shaderIndex);
			setTexture(fBinding->getDiffuseTexture());
//			setTexture(fShader->getDiffuseTexture());
		break;	
		case Shader::MODULE_SHADER:		
			currentMaterial = material;			
			for(int m=0; m < shaderModules.size(); m++) {
				PolycodeShaderModule *shaderModule = shaderModules[m];	
				if(shaderModule->hasShader(material->getShader(shaderIndex))) {
					shaderModule->applyShaderMaterial(this, material, localOptions, shaderIndex);
					currentShaderModule = shaderModule;
				}
			}
		break;
	}
}

void OpenGLRenderer::clearShader() {
	if(currentShaderModule) {
		currentShaderModule->clearShader();
		currentShaderModule = NULL;
	}
	currentMaterial = NULL;
}

void OpenGLRenderer::setTexture(Texture *texture) {
	if(texture == NULL) {
		glDisable(GL_TEXTURE_2D);
		return;
	}
	
	if(renderMode == RENDER_MODE_NORMAL) {
		glEnable (GL_TEXTURE_2D);
		if(currentTexture != texture) {			
			OpenGLTexture *glTexture = (OpenGLTexture*)texture;
			glBindTexture (GL_TEXTURE_2D, glTexture->getTextureID());
		}
	} else {
		glDisable(GL_TEXTURE_2D);
	}
	
	currentTexture = texture;
}

void OpenGLRenderer::pushMatrix() {
	glPushMatrix();
}

void OpenGLRenderer::popMatrix() {
	glPopMatrix();
}

void OpenGLRenderer::pushRenderDataArray(RenderDataArray *array) {
		
	
	switch(array->arrayType) {
		case RenderDataArray::VERTEX_DATA_ARRAY:
			glEnableClientState(GL_VERTEX_ARRAY);			
			glBindBufferARB( GL_ARRAY_BUFFER_ARB, 0);
			glVertexPointer(array->size, GL_FLOAT, 0, array->arrayPtr);
			verticesToDraw = array->count;
		break;
		case RenderDataArray::COLOR_DATA_ARRAY:		
			glColorPointer(array->size, GL_FLOAT, 0, array->arrayPtr);			
			glEnableClientState(GL_COLOR_ARRAY);
		break;
		case RenderDataArray::TEXCOORD_DATA_ARRAY:
			glEnableClientState(GL_TEXTURE_COORD_ARRAY);						
			glBindBufferARB( GL_ARRAY_BUFFER_ARB, 0);			
			glTexCoordPointer(array->size, GL_FLOAT, 0, array->arrayPtr);
		break;
		case RenderDataArray::NORMAL_DATA_ARRAY:
			glEnableClientState(GL_NORMAL_ARRAY);	
			glBindBufferARB( GL_ARRAY_BUFFER_ARB, 0);			
			glNormalPointer(GL_FLOAT, 0, array->arrayPtr);	
		break;
	}
}

RenderDataArray *OpenGLRenderer::createRenderDataArrayForMesh(Mesh *mesh, int arrayType) {
	RenderDataArray *newArray = createRenderDataArray(arrayType);
		
	newArray->count = 0;
	long bufferSize = 0;
	long newBufferSize = 0;		
	GLfloat* buffer = NULL;
	
	switch (arrayType) {
		case RenderDataArray::VERTEX_DATA_ARRAY:
		{		
			buffer = (GLfloat*)malloc(1);							
			for(int i=0; i < mesh->getPolygonCount(); i++) {
				for(int j=0; j < mesh->getPolygon(i)->getVertexCount(); j++) {
					newArray->count++;			
					newBufferSize = bufferSize + 3;
					buffer = (GLfloat*)realloc(buffer, newBufferSize * sizeof(GLfloat));
					buffer[bufferSize+0] = mesh->getPolygon(i)->getVertex(j)->x;
					buffer[bufferSize+1] = mesh->getPolygon(i)->getVertex(j)->y;
					buffer[bufferSize+2] = mesh->getPolygon(i)->getVertex(j)->z;			
					bufferSize = newBufferSize;	
				}		   
			}
		}
		break;
		case RenderDataArray::COLOR_DATA_ARRAY:
		{
			buffer = (GLfloat*)malloc(1);			
			for(int i=0; i < mesh->getPolygonCount(); i++) {
				for(int j=0; j < mesh->getPolygon(i)->getVertexCount(); j++) {
					newBufferSize = bufferSize + 4;			
					buffer = (GLfloat*)realloc(buffer, newBufferSize * sizeof(GLfloat));
					buffer[bufferSize+0] = mesh->getPolygon(i)->getVertex(j)->vertexColor.r;
					buffer[bufferSize+1] = mesh->getPolygon(i)->getVertex(j)->vertexColor.g;
					buffer[bufferSize+2] = mesh->getPolygon(i)->getVertex(j)->vertexColor.b;
					buffer[bufferSize+3] = mesh->getPolygon(i)->getVertex(j)->vertexColor.a;			
					bufferSize = newBufferSize;					
				}		   
			}
		}
		break;
		case RenderDataArray::NORMAL_DATA_ARRAY:
		{
			buffer = (GLfloat*)malloc(1);	
			
			for(int i=0; i < mesh->getPolygonCount(); i++) {
				for(int j=0; j < mesh->getPolygon(i)->getVertexCount(); j++) {
					newBufferSize = bufferSize + 3;			
					buffer = (GLfloat*)realloc(buffer, newBufferSize * sizeof(GLfloat));		
					if(mesh->getPolygon(i)->useVertexNormals) {
						buffer[bufferSize+0] = mesh->getPolygon(i)->getVertex(j)->normal->x;
						buffer[bufferSize+1] = mesh->getPolygon(i)->getVertex(j)->normal->y;
						buffer[bufferSize+2] = mesh->getPolygon(i)->getVertex(j)->normal->z;				
					} else {
						buffer[bufferSize+0] = mesh->getPolygon(i)->getFaceNormal().x;
						buffer[bufferSize+1] = mesh->getPolygon(i)->getFaceNormal().y;
						buffer[bufferSize+2] = mesh->getPolygon(i)->getFaceNormal().z;
					}
					bufferSize = newBufferSize;					
				}		   
			}			
		}
		break;
		case RenderDataArray::TEXCOORD_DATA_ARRAY:
		{
			buffer = (GLfloat*)malloc(1);				
			for(int i=0; i < mesh->getPolygonCount(); i++) {
				for(int j=0; j < mesh->getPolygon(i)->getVertexCount(); j++) {
					newBufferSize = bufferSize + 2;			
					buffer = (GLfloat*)realloc(buffer, newBufferSize * sizeof(GLfloat));		
					if(mesh->getPolygon(i)->usesFaceUV()) {															
						buffer[bufferSize+0] = mesh->getPolygon(i)->getTexCoord(j)->x;							
						buffer[bufferSize+1] = mesh->getPolygon(i)->getTexCoord(j)->y;											
					} else {
						buffer[bufferSize+0] = mesh->getPolygon(i)->getVertex(j)->getTexCoord()->x;											
						buffer[bufferSize+1] = mesh->getPolygon(i)->getVertex(j)->getTexCoord()->y;							
					}
					bufferSize = newBufferSize;					
				}		   
			}			
		}
		break;
		default:
		break;
	}
	
	if(buffer != NULL) {
		free(newArray->arrayPtr);
		newArray->arrayPtr = buffer;		
	}
	
	return newArray;
}

RenderDataArray *OpenGLRenderer::createRenderDataArray(int arrayType) {
	RenderDataArray *newArray = new RenderDataArray();
	newArray->arrayType = arrayType;
	newArray->arrayPtr = malloc(1);
	newArray->stride = 0;
	newArray->count = 0;
	
	switch (arrayType) {
		case RenderDataArray::VERTEX_DATA_ARRAY:
			newArray->size = 3;
			break;
		case RenderDataArray::COLOR_DATA_ARRAY:
			newArray->size = 4;
			break;			
		case RenderDataArray::NORMAL_DATA_ARRAY:
			newArray->size = 3;
			break;						
		case RenderDataArray::TEXCOORD_DATA_ARRAY:
			newArray->size = 2;
			break;									
		default:
			break;
	}
	
	return newArray;
}

void OpenGLRenderer::setRenderArrayData(RenderDataArray *array, Number *arrayData) {
	
}

void OpenGLRenderer::drawArrays(int drawType) {
	
	GLenum mode = GL_TRIANGLES;
	
	switch(drawType) {
		case Mesh::TRI_MESH:
			switch(renderMode) {
				case RENDER_MODE_NORMAL:
					mode = GL_TRIANGLES;
					break;
				case RENDER_MODE_WIREFRAME:
					mode = GL_LINE_LOOP;
					break;
			}
			break;
		case Mesh::TRIFAN_MESH:
			switch(renderMode) {
				case RENDER_MODE_NORMAL:
					mode = GL_TRIANGLE_FAN;
					break;
				case RENDER_MODE_WIREFRAME:
					mode = GL_LINE_LOOP;
					break;
			}
			break;
		case Mesh::QUAD_MESH:
			switch(renderMode) {
				case RENDER_MODE_NORMAL:
					mode = GL_QUADS;
					break;
				case RENDER_MODE_WIREFRAME:
					mode = GL_LINE_LOOP;
					break;
			}
			break;
		case Mesh::LINE_MESH:
			mode = GL_LINES;
			break;	
		case Mesh::POINT_MESH:
			mode = GL_POINTS;
		break;
	}
	
	glDrawArrays( mode, 0, verticesToDraw);	
	
	verticesToDraw = 0;
		
	glDisableClientState( GL_VERTEX_ARRAY);	
	glDisableClientState( GL_TEXTURE_COORD_ARRAY );		
	glDisableClientState( GL_NORMAL_ARRAY );
	glDisableClientState( GL_COLOR_ARRAY );		
}

/*
void OpenGLRenderer::draw3DVertex2UV(Vertex *vertex, Vector2 *faceUV1, Vector2 *faceUV2) {
	if(vertex->useVertexColor)
		glColor4f(vertex->vertexColor.r, vertex->vertexColor.g, vertex->vertexColor.b, vertex->vertexColor.a);

	if(currentTexture || currentMaterial) {
		glMultiTexCoord2f(GL_TEXTURE0, faceUV1->x, faceUV1->y);
		glMultiTexCoord2f(GL_TEXTURE1, faceUV2->x, faceUV2->y);
	}

//	glNormal3f(vertex->normal->x, vertex->normal->y, vertex->normal->z);
	glVertex3f(vertex->x, vertex->y, vertex->z);
}
*/

void OpenGLRenderer::drawScreenQuad(Number qx, Number qy) {
	setOrthoMode();
	
	Number xscale = qx/((Number)getXRes()) * 2.0f;
	Number yscale = qy/((Number)getYRes()) * 2.0f;

	glBegin(GL_QUADS);
		glColor4f(1.0f,1.0f,1.0f,1.0f);

		glTexCoord2f(0.0f, 1.0f);
		glVertex2f(-1, -1+(1.0f*yscale));

		glTexCoord2f(0.0f, 0.0f);
		glVertex2f(-1.0f, -1.0f);

		glTexCoord2f(1.0f, 0.0f);
		glVertex2f(-1+(1.0f*xscale), -1.0f);

		glTexCoord2f(1.0f, 1.0f);
		glVertex2f(-1+(1.0f*xscale), -1+(1.0f*yscale));
	glEnd();
	setPerspectiveMode();
}


void OpenGLRenderer::translate2D(Number x, Number y) {
	glTranslatef(x, y, 0.0f);
}

void OpenGLRenderer::scale2D(Vector2 *scale) {
	glScalef(scale->x, scale->y, 1.0f);
}

void OpenGLRenderer::loadIdentity() {
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

void OpenGLRenderer::rotate2D(Number angle) {
	glRotatef(angle, 0.0f, 0.0f, 1.0f);
}

void OpenGLRenderer::setVertexColor(Number r, Number g, Number b, Number a) {
	glColor4f(r,g,b,a);
}

void OpenGLRenderer::EndRender() {
///	glFlush();
//	glFinish();	
}

OpenGLRenderer::~OpenGLRenderer() {

}