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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdarg.h>
#include <math.h>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include "main.h"
#include "linear.h"
#include "shader.h"
float vertices[] = {
-0.5,-0.5,-0.5, 1.0, 1.0, 1.0,
0.5,-0.5,-0.5, 1.0, 1.0, 0.0,
-0.5, 0.5,-0.5, 1.0, 0.0, 1.0,
0.5, 0.5,-0.5, 1.0, 0.0, 0.0,
-0.5,-0.5, 0.5, 0.0, 1.0, 1.0,
0.5,-0.5, 0.5, 0.0, 1.0, 0.0,
-0.5, 0.5, 0.5, 0.0, 0.0, 1.0,
0.5, 0.5, 0.5, 0.0, 0.0, 0.0,
};
unsigned int indices[] = {
0, 1, 2,
2, 3, 1,
4, 5, 7,
7, 6, 4,
1, 3, 5,
3, 7, 5,
6, 0, 2,
6, 0, 4,
2, 7, 6,
2, 7, 3,
0, 1, 5,
0, 4, 5
};
static void userError(const char *msg, const char *detail);
static void glfw_size_callback(GLFWwindow *window, int width, int height);
static void processInput(GLFWwindow *window);
static void linearPrintMat4(mat4 x);
void
userError(const char *msg, const char *detail)
{
fprintf(stderr, "%s: %s\n", msg, detail);
exit(1);
}
void
glfw_size_callback(GLFWwindow *window, int width, int height)
{
glViewport(0, 0, width, height);
}
void
processInput(GLFWwindow *window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS
|| glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
glfwSetWindowShouldClose(window, 1);
if (glfwGetKey(window, GLFW_KEY_1) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
if (glfwGetKey(window, GLFW_KEY_2) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
if (glfwGetKey(window, GLFW_KEY_3) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
}
void
linearPrintMat4(mat4 x)
{
int i, j;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
printf("%f ", x.matrix[i][j]);
}
printf("\n");
}
printf("\n");
}
int main()
{
GLFWwindow *window;
const char *glfwErrno;
if (!glfwInit()) {
glfwGetError(&glfwErrno);
glfwTerminate();
userError("glfwInit() Error", glfwErrno);
}
window = glfwCreateWindow(640, 480, "Mverse", NULL, NULL);
if (!window) {
glfwTerminate();
userError("glfwCreateWindow() failed", "Can't create window");
}
glfwSetFramebufferSizeCallback(window, glfw_size_callback);
glfwMakeContextCurrent(window);
GLubyte glewErrno = glewInit();
if (glewErrno != GLEW_OK) {
glfwTerminate();
userError("glewInit() failed", (const char *)glewGetErrorString(glewErrno));
}
glEnable(GL_DEPTH_TEST);
unsigned int VBO, VAO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
glBindVertexArray(VAO);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
unsigned int shaderProgram = shaderCreateProgram("shaders/vertex.vsh",
"shaders/fragment.fsh");
unsigned int modelLoc, viewLoc, projLoc;
mat4 model, view, proj;
mat4 T, S, R;
float t;
while (!glfwWindowShouldClose(window)) {
processInput(window);
glClearColor(0.2f, 0.2f, 0.2f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
t = (float)glfwGetTime();
T = linearTranslate(0.0, 0.0, 0.0);
R = linearRotate(180 * t / M_PI, 0.0, 1.0, 0.0);
S = linearScale(1.0, 1.0, 1.0);
model = linearMat4Muln(3, T, R, S);
T = linearTranslate(0.0, -0.0, -80);
R = linearRotate(60, 1, 0, 0);
view = linearMat4Muln(2, T, R);
proj = linearPerspective(35, 4 / 3.0, 0.1, 100);
glUseProgram(shaderProgram);
glBindVertexArray(VAO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
modelLoc = glGetUniformLocation(shaderProgram, "model");
viewLoc = glGetUniformLocation(shaderProgram, "view");
projLoc = glGetUniformLocation(shaderProgram, "proj");
glUniformMatrix4fv(modelLoc, 1, GL_TRUE, model.matrix[0]);
glDrawElements(GL_TRIANGLES, sizeof(indices) / sizeof(int), GL_UNSIGNED_INT, 0);
glUniformMatrix4fv(viewLoc, 1, GL_TRUE, view.matrix[0]);
glDrawElements(GL_TRIANGLES, sizeof(indices) / sizeof(int), GL_UNSIGNED_INT, 0);
glUniformMatrix4fv(projLoc, 1, GL_TRUE, proj.matrix[0]);
glDrawElements(GL_TRIANGLES, sizeof(indices) / sizeof(int), GL_UNSIGNED_INT, 0);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}
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