396 lines
9.5 KiB
C
396 lines
9.5 KiB
C
#include <stdio.h>
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#include <GL/glew.h>
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#include <GLFW/glfw3.h>
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#include "vertexShader.c"
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#include "fragmentShader.c"
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#include "matrixMath.h"
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#include "transformation.h"
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#include "wavefrontobj.h"
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include <stdbool.h>
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#define RESTART 345678
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GLuint program;
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GLuint vao;
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GLuint cubeIndicesBufferObject;
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bool exitRequested = false;
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GLFWwindow* window;
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GLfloat aspectRatio = 1.0f;
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GLfloat step = 0.0f;
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const GLfloat pi = 3.14159f;
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vec3 cameraPosition = {0.0f, 0.0f, 2.0f};
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GLfloat cube[] = {
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, -1.0f,
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1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, -1.0f,
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-1.0f, 1.0f, 1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, -1.0f, -1.0f
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};
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GLfloat ground[] = {
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1.0f, 0.0f, 1.0f,
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1.0f, 0.0f, -1.0f,
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-1.0f, 0.0f, 0.0f,
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-1.0f, 0.0f, -1.0f
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};
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GLuint cubeIndices[] = {
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0, 1, 2,
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1, 3, 2,
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1, 7, 3,
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1, 5, 7,
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4, 6, 5,
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5, 6, 7,
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0, 2, 4,
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4, 2, 6,
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7, 6, 3,
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6, 2, 3,
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4, 5, 1,
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4, 1, 0
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};
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GLuint groundIndices[] = {
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0, 1, 2,
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1, 3, 2
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};
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void handleInputs(void) {
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if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
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cameraPosition.z += 0.02f;
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}
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if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
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cameraPosition.z -= 0.02f;
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}
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if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS) {
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cameraPosition.y += 0.02f;
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}
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if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS) {
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cameraPosition.y -= 0.02f;
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}
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}
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void keyboardHandler(GLFWwindow* window, int key, int scancode, int action, int mods) {
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if (action == GLFW_PRESS) {
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if (key == GLFW_KEY_ESCAPE) {
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exitRequested = true;
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}
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}
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}
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void init(void) {
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// create and compile vertex shader
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const GLchar *vertexTextConst = vertexShader_glsl;
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GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertexShader, 1, &vertexTextConst, &vertexShader_glsl_len);
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glCompileShader(vertexShader);
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GLint status;
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glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
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if (!status) {
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printf("Error compiling vertex shader: ");
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GLchar infoLog[1024];
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glGetShaderInfoLog(vertexShader, 1024, NULL, infoLog);
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printf("%s",infoLog);
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}
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vertexTextConst = NULL;
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// create and compile fragment shader
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const GLchar *fragmentTextConst = fragmentShader_glsl;
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GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragmentShader, 1, &fragmentTextConst, &fragmentShader_glsl_len);
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glCompileShader(fragmentShader);
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glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &status);
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if (!status) {
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printf("Error compiling fragment shader: ");
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GLchar infoLog[1024];
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glGetShaderInfoLog(fragmentShader, 1024, NULL, infoLog);
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printf("%s",infoLog);
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}
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// create and link shader program
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program = glCreateProgram();
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glAttachShader(program, vertexShader);
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glAttachShader(program, fragmentShader);
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glLinkProgram(program);
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glGetProgramiv(program, GL_LINK_STATUS, &status);
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if (!status) {
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printf("Error linking program: ");
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GLchar infoLog[1024];
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glGetProgramInfoLog(program, 1024, NULL, infoLog);
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printf("%s",infoLog);
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}
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glValidateProgram(program);
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glGetProgramiv(program, GL_VALIDATE_STATUS, &status);
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if (!status) {
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printf("Error validating program: ");
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GLchar infoLog[1024];
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glGetProgramInfoLog(program, 1024, NULL, infoLog);
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printf("%s",infoLog);
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}
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ParsedObjFile teapot = readObjFile("teapot.obj");
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GLuint triangleVertexBufferObject;
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glGenBuffers(1, &triangleVertexBufferObject);
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glBindBuffer(GL_ARRAY_BUFFER, triangleVertexBufferObject);
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glBufferData(GL_ARRAY_BUFFER, sizeof(cube), cube, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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// create vertex array object
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glBindBuffer(GL_ARRAY_BUFFER, triangleVertexBufferObject);
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glVertexAttribPointer(
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0,
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3,
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GL_FLOAT,
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GL_FALSE,
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sizeof(GLfloat) * 3,
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0
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);
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glEnableVertexAttribArray(0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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// ENABLE BACKFACE CULLING
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glFrontFace(GL_CW);
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glEnable(GL_CULL_FACE);
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// ENABLE RESTARTING
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glEnable(GL_PRIMITIVE_RESTART);
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glPrimitiveRestartIndex(RESTART);
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// DEFINE INDEX ARRAY FOR ELEMENT DRAWING
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glGenBuffers(1, &cubeIndicesBufferObject);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cubeIndicesBufferObject);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(cubeIndices), cubeIndices, GL_STATIC_DRAW);
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
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}
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void drawCube(vec3* position, vec3* scaleVec, vec3* rotateVec) {
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mat4 modelTransformation;
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identity(&modelTransformation);
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scale(&modelTransformation, &modelTransformation, scaleVec);
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rotateX(&modelTransformation, &modelTransformation, rotateVec->x);
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rotateY(&modelTransformation, &modelTransformation, rotateVec->y);
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rotateZ(&modelTransformation, &modelTransformation, rotateVec->z);
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translate(&modelTransformation, &modelTransformation, position);
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glUniformMatrix4fv(glGetUniformLocation(program, "modelTransformation"), 1, GL_FALSE, (GLfloat*)&modelTransformation);
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glUniform3f(glGetUniformLocation(program, "color"), 1.0f, 0.0f, 0.0f);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (void*)(0 * sizeof(GLuint)));
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glUniform3f(glGetUniformLocation(program, "color"), 1.0f, 1.0f, 0.0f);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (void*)(6 * sizeof(GLuint)));
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glUniform3f(glGetUniformLocation(program, "color"), 1.0f, 1.0f, 1.0f);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (void*)(12 * sizeof(GLuint)));
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glUniform3f(glGetUniformLocation(program, "color"), 0.0f, 1.0f, 1.0f);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (void*)(18 * sizeof(GLuint)));
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glUniform3f(glGetUniformLocation(program, "color"), 0.0f, 0.0f, 1.0f);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (void*)(24 * sizeof(GLuint)));
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glUniform3f(glGetUniformLocation(program, "color"), 1.0f, 0.0f, 1.0f);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (void*)(30 * sizeof(GLuint)));
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}
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void draw(void) {
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handleInputs();
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glClear(GL_COLOR_BUFFER_BIT);
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glUseProgram(program);
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glBindVertexArray(vao);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cubeIndicesBufferObject);
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step += 0.002f;
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if (step > 1.0f) step -= 1.0f;
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GLfloat stepi = step * pi * 2;
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// ------------- MODEL TRANSFORMATION ---------------------
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// SCALE -> ROTATE -> TRANSLATE
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// GLfloat cubePosition[3] = {0.0f, -2.0f, 0.0f};
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// GLfloat cubeScale[3] = {4.0f, 0.2f, 4.0f};
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// GLfloat modelTransformation[16];
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// identity(modelTransformation);
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// scale(modelTransformation, modelTransformation, cubeScale);
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// rotateY(modelTransformation, modelTransformation, stepi);
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// rotateX(modelTransformation, modelTransformation, stepi + 1.0f);
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// rotateZ(modelTransformation, modelTransformation, stepi + 0.5f);
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// translate(modelTransformation, modelTransformation, cubePosition);
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// ------------- VIEWING TRANSFORMATION -------------------
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vec3 origin = {0.0f, 0.0f, 0.0f};
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vec3 up = {0.0f, 1.0f, 0.0f};
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mat4 viewingTransformation;
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lookAt(&viewingTransformation, &cameraPosition, &origin, &up);
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// -------------- PROJECTION TRANSFORMATION ----------------
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mat4 projectionTransformation;
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GLfloat near = 0.1f;
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GLfloat far = 10.0f;
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perspectiveProjection(&projectionTransformation, near, far);
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// -------------- NORMALISATION TRANSFORMATION -------------
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mat4 normalisationTransformation;
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GLfloat fovy = pi / 2;
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normalisedDeviceCoordinatesFov(&normalisationTransformation, fovy, aspectRatio, near, far);
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mat4 globalTransformation;
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identity(&globalTransformation);
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multiply(&globalTransformation, &viewingTransformation, &globalTransformation);
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multiply(&globalTransformation, &projectionTransformation, &globalTransformation);
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multiply(&globalTransformation, &normalisationTransformation, &globalTransformation);
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glUniformMatrix4fv(glGetUniformLocation(program, "globalTransformation"), 1, GL_FALSE, (GLfloat*)&globalTransformation);
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vec3 position = {0.0f, -3.0f, 0.0f};
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vec3 scaleVec = {3.0f, 0.1f, 3.0f};
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vec3 rotateVec = {0.0f, 0.0f, 0.0f};
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drawCube(&position, &scaleVec, &rotateVec);
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position.y = -2.8f;
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scaleVec.x = 2.0f;
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scaleVec.z = 2.0f;
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rotateVec.x = pi;
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drawCube(&position, &scaleVec, &rotateVec);
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position.y = -2.4f;
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scaleVec.x = 1.0f;
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scaleVec.y = 0.3f;
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scaleVec.z = 1.0f;
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rotateVec.x = 0.0f;
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rotateVec.y = pi / 4;
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drawCube(&position, &scaleVec, &rotateVec);
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}
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void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
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glViewport(0, 0, width, height);
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aspectRatio = (float)width / height;
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}
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int main(void) {
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// GLfloat test[16] = {
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// 1.0f, 2.0f, 3.0f, 4.0f,
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// 5.0f, 6.0f, 7.0f, 8.0f,
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// 9.0f, 1.0f, 2.0f, 3.0f,
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// 4.0f, 5.0f, 6.0f, 7.0f
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// };
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// transpose(test, test);
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// GLfloat test2[16] = {
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// 0.0f, 1.0f, 0.0f, 1.0f,
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// 1.0f, 2.0f, 1.0f, 2.0f,
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// 2.0f, 3.0f, 2.0f, 3.0f,
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// 3.0f, 4.0f, 3.0f, 4.0f
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// };
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// transpose(test2, test2);
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// multiply(test, test, test2);
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// mat4Print(test);
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// return 0;
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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window = glfwCreateWindow(700, 700, "Computergrafik 1", NULL, NULL);
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if (!window) {
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printf("Failed to create window\n");
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glfwTerminate();
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return -1;
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}
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glfwMakeContextCurrent(window);
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// register keyboard event handler
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glfwSetKeyCallback(window, keyboardHandler);
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glewInit();
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printf("OpenGL version supported by this platform (%s):\n", glGetString(GL_VERSION));
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init();
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while (!glfwWindowShouldClose(window) && !exitRequested) {
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draw();
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glfwTerminate();
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return 0;
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} |