plane.hpp

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#ifndef __PLANE__
#define __PLANE__

#include <tucano/mesh.hpp>
#include <Eigen/Dense>
#include <cmath>

namespace Tucano
{

namespace Shapes
{

const string plane_fragment_code = "\n"
        "#version 430\n"
        "in vec4 color;\n"
                "in vec3 normal;\n"
                "in vec4 vert;\n"
        "out vec4 out_Color;\n"
                "uniform mat4 lightViewMatrix;\n"
        "void main(void)\n"
        "{\n"
                "   vec3 eyeDirection = -normalize(vert.xyz);\n"
        "   //if (dot(normal, eyeDirection) < 0.0) discard;\n"
                "   vec3 lightDirection = (lightViewMatrix * vec4(0.0, 0.0, 1.0, 0.0)).xyz;\n"
                "   lightDirection = normalize(lightDirection);\n"
                "   vec3 lightReflection = reflect(-lightDirection, normal);\n"
                "   float shininess = 100.0;\n"
                "       vec4 ambientLight = color * 0.4;\n"
                "       vec4 diffuseLight = color * 0.6 * max(dot(lightDirection, normal),0.0);\n"
                "       vec4 specularLight = vec4(1.0) *  max(pow(dot(lightReflection, eyeDirection), shininess),0.0);\n"
                "       out_Color = vec4(ambientLight.xyz + diffuseLight.xyz + specularLight.xyz, color.w);\n"
        "}\n";

const string plane_vertex_code = "\n"
        "#version 430\n"
                "in vec4 in_Position;\n"
                "in vec4 in_Normal;\n"
        "out vec4 color;\n"
                "out vec3 normal;\n"
                "out vec4 vert;\n"
        "uniform mat4 modelMatrix;\n"
        "uniform mat4 viewMatrix;\n"
        "uniform mat4 projectionMatrix;\n"
        "uniform vec4 in_Color;\n"
        "void main(void)\n"
        "{\n"
                "   mat4 modelViewMatrix = viewMatrix * modelMatrix;\n"
                "   mat4 normalMatrix = transpose(inverse(modelViewMatrix));\n"
                "   normal = normalize(vec3(normalMatrix * vec4(in_Normal.xyz,0.0)).xyz);\n"
                "   vert = modelViewMatrix * in_Position;\n"
        "   gl_Position = projectionMatrix * modelViewMatrix * in_Position;\n"
        "   color = in_Color;\n"
        "}\n";


class Plane : public Tucano::Mesh {

private:

        // Shader to render splane
        Tucano::Shader plane_shader;

    float width;

    float height;

public:

        Plane(float w = 1.0, float h = 1.0)
        {
        width = w;
        height = h;

                resetModelMatrix();
                createGeometry();

                default_color << 1.0, 0.48, 0.16, 1.0;

                plane_shader.setShaderName("planeShader");
                plane_shader.initializeFromStrings(plane_vertex_code, plane_fragment_code);

        #ifdef TUCANODEBUG
        Tucano::Misc::errorCheckFunc(__FILE__, __LINE__, "plane constructor"); 
        #endif
        }

        void render (const Tucano::Camera& camera, const Tucano::Camera& light)
        {
                Eigen::Vector4f viewport = camera.getViewport();
                glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);

                plane_shader.bind();

        plane_shader.setUniform("modelMatrix", model_matrix);
                plane_shader.setUniform("viewMatrix", camera.getViewMatrix());
        plane_shader.setUniform("projectionMatrix", camera.getProjectionMatrix());
                plane_shader.setUniform("lightViewMatrix", light.getViewMatrix());
        plane_shader.setUniform("in_Color", default_color);

                this->setAttributeLocation(&plane_shader);

                this->bindBuffers();
                this->renderElements();
                this->unbindBuffers();

        plane_shader.unbind();

                #ifdef TUCANODEBUG
                Misc::errorCheckFunc(__FILE__, __LINE__);
                #endif
        }

private:


        void createGeometry (void)
        {
                vector< Eigen::Vector4f > vert;
                vector< Eigen::Vector3f > normals;
        vector<Eigen::Vector2f> texcoord;
                vector< GLuint > faces;
        
                vert.push_back ( Eigen::Vector4f( -width*0.5, -height*0.5, 0.0, 1.0) );
                vert.push_back ( Eigen::Vector4f(  width*0.5, -height*0.5, 0.0, 1.0) );
                vert.push_back ( Eigen::Vector4f(  width*0.5,  height*0.5, 0.0, 1.0) );
                vert.push_back ( Eigen::Vector4f( -width*0.5,  height*0.5, 0.0, 1.0) );
        
        texcoord.push_back ( Eigen::Vector2f(0.0, 0.0) );
        texcoord.push_back ( Eigen::Vector2f(1.0, 0.0) );
        texcoord.push_back ( Eigen::Vector2f(1.0, 1.0) );
        texcoord.push_back ( Eigen::Vector2f(0.0, 1.0) );

        normals.push_back ( Eigen::Vector3f (0.0, 0.0, 1.0) );
        normals.push_back ( Eigen::Vector3f (0.0, 0.0, 1.0) );
        normals.push_back ( Eigen::Vector3f (0.0, 0.0, 1.0) );
        normals.push_back ( Eigen::Vector3f (0.0, 0.0, 1.0) );

                int a[6] = { 0, 1, 2, 2, 3, 0};
                faces.insert(faces.end(), a, a+6);
        
                loadVertices(vert);
                loadNormals(normals);
        loadTexCoords(texcoord);
                loadIndices(faces);

                setDefaultAttribLocations();
                
        }

};
}
}
#endif