From 3bad7358dc55a969aec23bb5a5932c072d4beedd Mon Sep 17 00:00:00 2001
From: jvech <jmvalenciae@unal.edu.co>
Date: Fri, 19 Aug 2022 10:08:09 -0500
Subject: feat: vertex and fragment shader loader implemented

---
 src/main.c | 76 +++++++++-----------------------------------------------------
 1 file changed, 10 insertions(+), 66 deletions(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index 2d296a8..af2c65a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,24 +6,9 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 
+#include "shader.h"
 #include "main.h"
 
-const char *vertexShaderSource = \
-"#version 330 core\n"
-"layout (location = 0) in vec3 aPos;\n"
-"void main()\n"
-"{\n"
-"   gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
-"}\0";
-
-const char *fragmentShaderSource = \
-"#version 330 core\n"
-"out vec4 FragColor;\n"
-"void main()\n"
-"{\n"
-"   FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
-"}\0";
-
 float vertices[] = {
     -0.5f, -0.5f, 0.0f,
     0.5f, -0.5f, 0.0f,
@@ -34,7 +19,6 @@ float vertices[] = {
 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, struct Background *c);
-static void checkGLSuccess(unsigned int compiledShader, unsigned int shaderStep);
 
 void 
 userError(const char *msg, const char *detail)
@@ -64,34 +48,6 @@ processInput(GLFWwindow *window, struct Background *c)
     } 
 }
 
-void 
-checkGLSuccess(unsigned int shaderBinary, unsigned int shaderStep)
-{
-    int success;
-    char infoLog[512];
-    switch (shaderStep) {
-        case 0:
-            glGetShaderiv(shaderBinary, GL_COMPILE_STATUS, &success);
-            if (!success) {
-                glGetShaderInfoLog(shaderBinary, 512, NULL, infoLog);
-                userError("glCompileShader() ERROR", infoLog);
-            }
-            break;
-
-        case 1:
-            glGetProgramiv(shaderBinary, GL_LINK_STATUS, &success);
-
-            if (!success) {
-                glGetProgramInfoLog(shaderBinary, 512, NULL, infoLog);
-                userError("glLinkProgram() ERROR", infoLog);
-            }
-            break;
-
-        default:
-            break;
-    }
-}
-
 int main()
 {
     GLFWwindow *window;
@@ -125,32 +81,18 @@ int main()
     glBindVertexArray(VAO);
 
     glGenBuffers(1, &VBO);
+
     glBindBuffer(GL_ARRAY_BUFFER, VBO);
     glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
     glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
     glEnableVertexAttribArray(0);
 
-    unsigned int vertexShader, fragmentShader, shaderProgram;
-    vertexShader = glCreateShader(GL_VERTEX_SHADER);
-    glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
-    glCompileShader(vertexShader);
-    checkGLSuccess(vertexShader, 0);
-    printf("Vertex Compiled\n");
-
-    fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
-    glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
-    glCompileShader(fragmentShader);
-    checkGLSuccess(fragmentShader, 0);
-    printf("Fragment Compiled\n");
-
-    shaderProgram = glCreateProgram();
-    glAttachShader(shaderProgram, vertexShader);
-    glAttachShader(shaderProgram, fragmentShader);
-    glLinkProgram(shaderProgram);
-    checkGLSuccess(shaderProgram, 1);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
 
-    glDeleteShader(vertexShader);
-    glDeleteShader(fragmentShader);
+    unsigned int shaderProgram = shaderCreateProgram("shaders/vertex.vsh", 
+                                                     "shaders/fragment.vsh");
 
     while (!glfwWindowShouldClose(window)) {
         processInput(window, &colors);
@@ -160,12 +102,14 @@ int main()
 
         glUseProgram(shaderProgram);
         glBindVertexArray(VAO);
-        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
         glDrawArrays(GL_TRIANGLES, 0, 3);
 
         glfwSwapBuffers(window);
         glfwPollEvents();
     }
+    int nattributes;
+    glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &nattributes);
+    printf("%d\n", nattributes);
     glfwTerminate();
     return 0;
 }
-- 
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