vec3 calulateNormal(vec3 p0, vec3 p1, vec3 p2) {
vec3 v1; vec3 v2;
v1.x = (p1.x - p0.x);
v1.y = (p1.y - p0.y);
v1.z = (p1.z - p0.z);
v2.x = (p2.x - p0.x);
v2.y = (p2.y - p0.y);
v2.z = (p2.z - p0.z);
return makeNormal(v1, v2);
}
void init (void) {
// make normals from vertices shared surface normals
// bottom normals flipped "up" for top view, as there is no bottom view.
makeNormal( 0, glm::normalize(glm::vec3(-0.00, 0.30, 0.95) + glm::vec3( 0.00, -1.00, 0.00) + glm::vec3(-0.95, 0.30, 0.00))); // front left bottom
makeNormal( 3, glm::normalize(glm::vec3(-0.00, 0.30, 0.95) + glm::vec3( 0.00, -1.00, 0.00) +
glm::vec3( 0.00, -1.00, 0.00) + glm::vec3( 0.95, 0.30, 0.00))); // front right bottom
makeNormal( 6, glm::normalize(glm::vec3( 0.00, 0.30, -0.95) + glm::vec3( 0.00, -1.00, 0.00) + glm::vec3( 0.95, 0.30, 0.00))); // back right bottom
makeNormal( 9, glm::normalize(glm::vec3( 0.00, 0.30, -0.95) + glm::vec3( 0.00, -1.00, 0.00) +
glm::vec3( 0.00, -1.00, 0.00) + glm::vec3(-0.95, 0.30, 0.00))); // back left bottom
makeNormal(12, glm::normalize(glm::vec3(-0.00, 0.30, 0.95) + glm::vec3( 0.00, 0.30, -0.95) +
glm::vec3( 0.95, 0.30, 0.00) + glm::vec3(-0.95, 0.30, 0.00))); // apex
shaderProgram = loadShaders(vertexShaderFile,fragmentShaderFile);
glUseProgram(shaderProgram);
// set up the indices buffer
glGenBuffers(1, &ibo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
// set up the vertex attributes
glGenVertexArrays( 1, &vao );
glBindVertexArray( vao );
// initialize a buffer object
glGenBuffers( 1, &vbo );
// glEnableVertexAttribArray(vbo);
glBindBuffer( GL_ARRAY_BUFFER, vbo );
glBufferData( GL_ARRAY_BUFFER, sizeof(point) + sizeof(texCoords) + sizeof(normal), NULL, GL_STATIC_DRAW );
glBufferSubData( GL_ARRAY_BUFFER, 0, sizeof(point), point );
glBufferSubData( GL_ARRAY_BUFFER, sizeof(point), sizeof(texCoords), texCoords);
glBufferSubData( GL_ARRAY_BUFFER, sizeof(point) + sizeof(texCoords), sizeof(normal), normal );
// set up vertex arrays (after shaders are loaded)
vPosition = glGetAttribLocation( shaderProgram, "vPosition" );
glVertexAttribPointer( vPosition, 4, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0) );
glEnableVertexAttribArray( vPosition );
vTexCoord = glGetAttribLocation( shaderProgram, "vTexCoord" );
glVertexAttribPointer( vTexCoord, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(sizeof(point)) );
glEnableVertexAttribArray( vTexCoord );
vNormal = glGetAttribLocation( shaderProgram, "vNormal" );
glVertexAttribPointer( vNormal, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(sizeof(point) + sizeof(texCoords)) );
glEnableVertexAttribArray( vNormal );
NormalMatrix = glGetUniformLocation(shaderProgram, "NormalMatrix");
MVP = glGetUniformLocation(shaderProgram, "MVP");
// load texture
texture = loadRawTexture( texture, fileName, width, height);
if (texture != 0) {
printf("texture file, read, texture generated and bound \n");
Texture = glGetUniformLocation(shaderProgram, "Texture"); }
else // texture file loaded
printf("Texture in file %s NOT LOADED !!! \n");
// If you want to see what these values are...
printf("vbo %3d ibo %3d\n", vbo, ibo);
printf("locations: vPosition %3d, vTexCoord %3d, vNormal %3d, NormalMatrix %3d, MVP %3d, Texture %3d \n",
vPosition, vTexCoord, vNormal, NormalMatrix, MVP, Texture);
rotationMatrix = glm::mat4();
// initially use a front view
eye = glm::vec3(300.0f, 300.0f, 300.0f); // eye is 300 "out of screen" from origin
at = glm::vec3( 0.0f, 0.0f, 0.0f); // looking at origin
up = glm::vec3( 0.0f, 1.0f, 0.0f); // camera'a up vector
// set render state values
glCullFace(GL_BACK); // show only front faces
glEnable(GL_DEPTH_TEST);
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
}
