From d7bd9a3dbd3486a4b0615dc9f30a890ff6d04ec6 Mon Sep 17 00:00:00 2001
From: jvech <jmvalenciae@unal.edu.co>
Date: Mon, 29 Aug 2022 09:12:18 -0500
Subject: feat: 3D support added

---
 src/main.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 73 insertions(+), 14 deletions(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index 27181ef..7cded68 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3,7 +3,9 @@
 #include <errno.h>
 #include <string.h>
 #include <signal.h>
+#include <stdarg.h>
 
+#include <math.h>
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 
@@ -12,21 +14,42 @@
 #include "shader.h"
 
 float vertices[] = {
-    -0.5f, -0.5f, 0.0f, 1.0f, 1.0f, 0.0f,
-    0.5f, -0.5f, 0.0f, 1.0f, 1.0f, 0.0f,
-    -0.5f, 0.5f, 0.0f, 1.0, 1.0f, 0.0f,
-    0.5f, 0.5f, 0.0f, 1.0, 1.0f, 0.0f,
+    -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
+    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)
 {
@@ -34,7 +57,7 @@ userError(const char *msg, const char *detail)
     exit(1);
 }
 
-static void
+void
 glfw_size_callback(GLFWwindow *window, int width, int height)
 {
     glViewport(0, 0, width, height);
@@ -55,6 +78,19 @@ processInput(GLFWwindow *window)
         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;
@@ -81,6 +117,8 @@ int main()
         userError("glewInit() failed", (const char *)glewGetErrorString(glewErrno));
     }
 
+    glEnable(GL_DEPTH_TEST);
+
     unsigned int VBO, VAO, EBO;
     glGenVertexArrays(1, &VAO);
     glGenBuffers(1, &VBO);
@@ -103,25 +141,46 @@ int main()
     glBindVertexArray(0);
 
     unsigned int shaderProgram = shaderCreateProgram("shaders/vertex.vsh", 
-                                                     "shaders/fragment.vsh");
+                                                     "shaders/fragment.fsh");
 
-    unsigned int transformLoc;
-    mat4 transform;
+    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);
+        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);
 
-        transformLoc = glGetUniformLocation(shaderProgram, "trans");
-        transform = linearRotate(45.0, linearVec3(0, 0, 1));
-        glUniformMatrix4fv(transformLoc, 1, GL_FALSE, transform.matrix[0]);
-        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+        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();
-- 
cgit v1.2.3-70-g09d2