anki-3d-engine/src/Renderer/Renderer.cpp

#include "Renderer.h"
#include "Camera.h"
#include "RendererInitializer.h"
#include "Material.h"
#include "App.h"
#include "Scene.h"
#include "Exception.h"


//======================================================================================================================
// Statics                                                                                                             =
//======================================================================================================================
float Renderer::quadVertCoords [][2] = { {1.0, 1.0}, {0.0, 1.0}, {0.0, 0.0}, {1.0, 0.0} };
int Renderer::maxColorAtachments = -1;

Vbo* Renderer::quadPositionsVbo = NULL;
Vao* Renderer::globalVao = NULL;


//======================================================================================================================
// Constructor                                                                                                         =
//======================================================================================================================
Renderer::Renderer(Object* parent):
	Object(parent),
	width(640),
	height(480),
	ms(*this),
	is(*this),
	pps(*this),
	bs(*this)
{}


//======================================================================================================================
// init                                                                                                                =
//======================================================================================================================
void Renderer::init(const RendererInitializer& initializer)
{
	// set from the initializer
	width = initializer.width;
	height = initializer.height;

	aspectRatio = float(width)/height;
	framesNum = 0;

	// a few sanity checks
	if(width < 10 || height < 10)
	{
		throw EXCEPTION("Incorrect width");
	}

	// init the stages. Careful with the order!!!!!!!!!!
	ms.init(initializer);
	/*is.init(initializer);
	pps.init(initializer);
	bs.init(initializer);*/

	// VBOs
	if(quadPositionsVbo == NULL)
	{
		float quadVertCoords[][2] = {{1.0, 1.0}, {0.0, 1.0}, {0.0, 0.0}, {1.0, 0.0}};
		quadPositionsVbo = new Vbo(GL_ARRAY_BUFFER, sizeof(quadVertCoords), quadVertCoords, GL_STATIC_DRAW);
	}
}


//======================================================================================================================
// render                                                                                                              =
//======================================================================================================================
void Renderer::render(Camera& cam_)
{
	cam = &cam_;

	viewProjectionMat = cam->getProjectionMatrix() * cam->getViewMatrix();
	ms.run();
	/*is.run();
	pps.runPrePass();
	bs.run();
	pps.runPostPass();*/

	++framesNum;
}


//======================================================================================================================
// drawQuad                                                                                                            =
//======================================================================================================================
void Renderer::drawQuad(int vertCoordsAttribLoc)
{
	RASSERT_THROW_EXCEPTION(vertCoordsAttribLoc == -1);
	quadPositionsVbo->bind();
	glEnableVertexAttribArray(vertCoordsAttribLoc);
	glVertexAttribPointer(vertCoordsAttribLoc, 2, GL_FLOAT, false, 0, NULL);
	glDrawArrays(GL_QUADS, 0, 4);
	glDisableVertexAttribArray(vertCoordsAttribLoc);
}


//======================================================================================================================
// setupMaterial                                                                                                       =
//======================================================================================================================
void Renderer::setupMaterial(const Material& mtl, const SceneNode& sceneNode, const Camera& cam)
{
	mtl.shaderProg->bind();
	uint textureUnit = 0;

	//
	// FFP stuff
	//
	if(mtl.blends)
	{
		glEnable(GL_BLEND);
		//glDisable(GL_BLEND);
		glBlendFunc(mtl.blendingSfactor, mtl.blendingDfactor);
	}
	else
	{
		glDisable(GL_BLEND);
	}


	if(mtl.depthTesting)
	{
		glEnable(GL_DEPTH_TEST);
	}
	else
	{
		glDisable(GL_DEPTH_TEST);
	}

	if(mtl.wireframe)
	{
		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
	}
	else
	{
		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
	}


	//
	// calc needed matrices
	//
	Mat4 modelMat(sceneNode.getWorldTransform());
	const Mat4& projectionMat = cam.getProjectionMatrix();
	const Mat4& viewMat = cam.getViewMatrix();
	Mat4 modelViewMat;
	Mat3 normalMat;
	Mat4 modelViewProjectionMat;

	// should I calculate the modelViewMat ?
	if(mtl.stdUniVars[Material::SUV_MODELVIEW_MAT] ||
	   mtl.stdUniVars[Material::SUV_MODELVIEWPROJECTION_MAT] ||
	   mtl.stdUniVars[Material::SUV_NORMAL_MAT])
	{
		modelViewMat = Mat4::combineTransformations(viewMat, modelMat);
	}

	// set matrices
	if(mtl.stdUniVars[Material::SUV_MODEL_MAT])
		mtl.stdUniVars[Material::SUV_MODEL_MAT]->setMat4(&modelMat);

	if(mtl.stdUniVars[Material::SUV_VIEW_MAT])
		mtl.stdUniVars[Material::SUV_VIEW_MAT]->setMat4(&viewMat);

	if(mtl.stdUniVars[Material::SUV_PROJECTION_MAT])
		mtl.stdUniVars[Material::SUV_PROJECTION_MAT]->setMat4(&projectionMat);

	if(mtl.stdUniVars[Material::SUV_MODELVIEW_MAT])
		mtl.stdUniVars[Material::SUV_MODELVIEW_MAT]->setMat4(&modelViewMat);

	if(mtl.stdUniVars[Material::SUV_VIEWPROJECTION_MAT])
		mtl.stdUniVars[Material::SUV_VIEWPROJECTION_MAT]->setMat4(&viewProjectionMat);

	if(mtl.stdUniVars[Material::SUV_NORMAL_MAT])
	{
		normalMat = modelViewMat.getRotationPart();
		mtl.stdUniVars[Material::SUV_NORMAL_MAT]->setMat3(&normalMat);
	}

	if(mtl.stdUniVars[Material::SUV_MODELVIEWPROJECTION_MAT])
	{
		modelViewProjectionMat = projectionMat * modelViewMat;
		mtl.stdUniVars[Material::SUV_MODELVIEWPROJECTION_MAT]->setMat4(&modelViewProjectionMat);
	}


	//
	// FAis
	//
	if(mtl.stdUniVars[Material::SUV_MS_NORMAL_FAI])
		mtl.stdUniVars[Material::SUV_MS_NORMAL_FAI]->setTexture(ms.normalFai, textureUnit++);

	if(mtl.stdUniVars[Material::SUV_MS_DIFFUSE_FAI])
		mtl.stdUniVars[Material::SUV_MS_DIFFUSE_FAI]->setTexture(ms.diffuseFai, textureUnit++);

	if(mtl.stdUniVars[Material::SUV_MS_SPECULAR_FAI])
		mtl.stdUniVars[Material::SUV_MS_SPECULAR_FAI]->setTexture(ms.specularFai, textureUnit++);

	if(mtl.stdUniVars[Material::SUV_MS_DEPTH_FAI])
		mtl.stdUniVars[Material::SUV_MS_DEPTH_FAI]->setTexture(ms.depthFai, textureUnit++);

	if(mtl.stdUniVars[Material::SUV_IS_FAI])
		mtl.stdUniVars[Material::SUV_IS_FAI]->setTexture(is.fai, textureUnit++);

	if(mtl.stdUniVars[Material::SUV_PPS_PRE_PASS_FAI])
		mtl.stdUniVars[Material::SUV_PPS_PRE_PASS_FAI]->setTexture(pps.prePassFai, textureUnit++);

	if(mtl.stdUniVars[Material::SUV_PPS_POST_PASS_FAI])
		mtl.stdUniVars[Material::SUV_PPS_POST_PASS_FAI]->setTexture(pps.postPassFai, textureUnit++);


	//
	// Other
	//
	if(mtl.stdUniVars[Material::SUV_RENDERER_SIZE])
	{
		Vec2 v(width, height);
		mtl.stdUniVars[Material::SUV_RENDERER_SIZE]->setVec2(&v);
	}

	if(mtl.stdUniVars[Material::SUV_SCENE_AMBIENT_COLOR])
	{
		Vec3 col(app->getScene().getAmbientCol());
		mtl.stdUniVars[Material::SUV_SCENE_AMBIENT_COLOR]->setVec3(&col);
	}


	//
	// set user defined vars
	//
	for(uint i=0; i<mtl.userDefinedVars.size(); i++)
	{
		const Material::UserDefinedUniVar* udv = &mtl.userDefinedVars[i];
		switch(udv->sProgVar->getGlDataType())
		{
			// texture
			case GL_SAMPLER_2D:
				udv->sProgVar->setTexture(*udv->value.texture, textureUnit++);
				break;
			// float
			case GL_FLOAT:
				udv->sProgVar->setFloat(udv->value.float_);
				break;
			// vec2
			case GL_FLOAT_VEC2:
				udv->sProgVar->setVec2(&udv->value.vec2);
				break;
			// vec3
			case GL_FLOAT_VEC3:
				udv->sProgVar->setVec3(&udv->value.vec3);
				break;
			// vec4
			case GL_FLOAT_VEC4:
				udv->sProgVar->setVec4(&udv->value.vec4);
				break;
		}
	}
}


//======================================================================================================================
// setProjectionMatrix                                                                                                 =
//======================================================================================================================
void Renderer::setProjectionMatrix(const Camera& cam)
{
	glMatrixMode(GL_PROJECTION);
	loadMatrix(cam.getProjectionMatrix());
}


//======================================================================================================================
// setViewMatrix                                                                                                       =
//======================================================================================================================
void Renderer::setViewMatrix(const Camera& cam)
{
	glMatrixMode(GL_MODELVIEW);
	loadMatrix(cam.getViewMatrix());
}


//======================================================================================================================
// unproject                                                                                                           =
//======================================================================================================================
Vec3 Renderer::unproject(const Vec3& windowCoords, const Mat4& modelViewMat, const Mat4& projectionMat,
                          const int view[4])
{
	Mat4 invPm = projectionMat * modelViewMat;
	invPm.invert();

	// the vec is in NDC space meaning: -1<=vec.x<=1 -1<=vec.y<=1 -1<=vec.z<=1
	Vec4 vec;
	vec.x = (2.0*(windowCoords.x-view[0]))/view[2] - 1.0;
	vec.y = (2.0*(windowCoords.y-view[1]))/view[3] - 1.0;
	vec.z = 2.0*windowCoords.z - 1.0;
	vec.w = 1.0;

	Vec4 final = invPm * vec;
	final /= final.w;
	return Vec3(final);
}


//======================================================================================================================
// ortho                                                                                                               =
//======================================================================================================================
Mat4 Renderer::ortho(float left, float right, float bottom, float top, float near, float far)
{
	float difx = right-left;
	float dify = top-bottom;
	float difz = far-near;
	float tx = -(right+left) / difx;
	float ty = -(top+bottom) / dify;
	float tz = -(far+near) / difz;
	Mat4 m;

	m(0, 0) = 2.0 / difx;
	m(0, 1) = 0.0;
	m(0, 2) = 0.0;
	m(0, 3) = tx;
	m(1, 0) = 0.0;
	m(1, 1) = 2.0 / dify;
	m(1, 2) = 0.0;
	m(1, 3) = ty;
	m(2, 0) = 0.0;
	m(2, 1) = 0.0;
	m(2, 2) = -2.0 / difz;
	m(2, 3) = tz;
	m(3, 0) = 0.0;
	m(3, 1) = 0.0;
	m(3, 2) = 0.0;
	m(3, 3) = 1.0;

	return m;
}