Added texture sqr

.gitignore

@@ -1,4 +1,3 @@
 .direnv
 *.o
-ogl
-*~
+ogl

headers/shapes.h

@@ -18,6 +18,14 @@ unsigned int sqr_indices[] = {
     1, 2, 3  /*br triangle*/
 };
 
+float sqr_tex_vertices[] = {
+    /*positions*colors*texture coords*/
+    0.5f,  0.5f,  0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, /*top right*/
+    0.5f,  -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, /*bottom right*/
+    -0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, /*bottom left*/
+    -0.5f, 0.5f,  0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f  /*top left*/
+};
+
 const char *basicVertexShaderSource =
     "#version 330 core\n"
     "layout (location = 0) in vec3 aPos;\n"
@@ -55,11 +63,12 @@ const char *rgbFragmentShaderSource = "#version 330 core\n"
                                       "    FragColor = vec4(color, 1.0);\n"
                                       "}\0";
 
-const char *rgbPulseFragmentShaderSource = "#version 330 core\n"
-                                       "out vec4 FragColor;\n"
-                                       "in vec3 color;\n"
-                                       "uniform float u_time;"
-                                       "void main()\n"
-                                       "{\n"
-                                       "    FragColor = vec4(color,0.0)*(sin(u_time)/2.0+0.5);\n"
-                                       "}\0";
+const char *rgbPulseFragmentShaderSource =
+    "#version 330 core\n"
+    "out vec4 FragColor;\n"
+    "in vec3 color;\n"
+    "uniform float u_time;"
+    "void main()\n"
+    "{\n"
+    "    FragColor = vec4(color,0.0)*(sin(u_time)/2.0+0.5);\n"
+    "}\0";

shaders/TexFrag.glsl

@@ -0,0 +1,12 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec3 ourColor;
+in vec2 TexCoord;
+
+uniform sampler2D tex0;
+
+void main()
+{
+    FragColor = texture(Tex0, TexCoord) * vec4(ourColor, 1.0);
+}

shaders/TexVert.glsl

@@ -0,0 +1,14 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aColor;
+layout (location = 2) in vec2 aTexCoord;
+
+out vec3 ourColor;
+out vec2 TexCoord;
+
+void main()
+{
+    gl_Position = vec4(aPos, 1.0);
+    ourColor = aColor;
+    TexCoord = aTexCoord;
+}

src/main.cpp

@@ -2,15 +2,15 @@
 #include <GLFW/glfw3.h>
 #include <cassert>
 #include <iostream>
-#include <shapes.h>
 #include <shader.hpp>
+#include <shapes.h>
+#include <stb_image.h>
 
 #define UNUSED(x) (void)(x)
 
 void processInput(GLFWwindow *window);
 void framebuffer_size_callback(GLFWwindow *window, int width, int height);
 
-
 int main(void) {
   int tmp = 0;
 
@@ -29,27 +29,55 @@ int main(void) {
   glViewport(0, 0, 800, 600);
   glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
 
-  unsigned int VBO,VAO,EBO;
+  unsigned int VBO, VAO, EBO;
   glGenVertexArrays(1, &VAO);
   glBindVertexArray(VAO);
 
   glGenBuffers(1, &VBO);
   glBindBuffer(GL_ARRAY_BUFFER, VBO);
 
-  glBufferData(GL_ARRAY_BUFFER, sizeof(tri_rgb_vertices), tri_rgb_vertices,
+  glBufferData(GL_ARRAY_BUFFER, sizeof(sqr_tex_vertices), sqr_tex_vertices,
                GL_STATIC_DRAW);
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)0);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void *)0);
   glEnableVertexAttribArray(0);
-  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)(3 * sizeof(float)));
+  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float),
+                        (void *)(3 * sizeof(float)));
   glEnableVertexAttribArray(1);
 
-  /*
+  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float),
+                        (void *)(6 * sizeof(float)));
+  glEnableVertexAttribArray(2);
+
   glGenBuffers(1, &EBO);
   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
-  glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(sqr_indices), sqr_indices, GL_STATIC_DRAW);
-  */
+  glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(sqr_indices), sqr_indices,
+               GL_STATIC_DRAW);
 
-  Shader* shaderProgram = new Shader("./shaders/rgbPulseVert.glsl","./shaders/rgbPulseFrag.glsl");
+  Shader *shaderProgram =
+      new Shader("./shaders/TexVert.glsl", "./shaders/TexFrag.glsl");
+
+  unsigned int texture;
+  glGenTextures(1, &texture);
+  glBindTexture(GL_TEXTURE_2D, texture);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+                  GL_LINEAR_MIPMAP_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+  stbi_set_flip_vertically_on_load(true);
+  int width, height, nrChannels;
+  unsigned char *data =
+      stbi_load("./texture/container.jpg", &width, &height, &nrChannels, 0);
+  if (data) {
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB,
+                 GL_UNSIGNED_BYTE, data);
+    glGenerateMipmap(GL_TEXTURE_2D);
+  } else {
+    std::cout << "Failed to load texture" << std::endl;
+  }
+  stbi_image_free(data);
 
   while (!glfwWindowShouldClose(window)) {
     processInput(window);
@@ -58,17 +86,18 @@ int main(void) {
     glClear(GL_COLOR_BUFFER_BIT);
 
     shaderProgram->use();
-    shaderProgram->setFloat("u_time",glfwGetTime());
+    shaderProgram->setInt("Tex0",0);
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture);
     glBindVertexArray(VAO);
 
-    //glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
-    glDrawArrays(GL_TRIANGLES, 0, 3);
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
     glfwSwapBuffers(window);
 
     glfwPollEvents();
   }
 
-  delete(shaderProgram);
+  delete (shaderProgram);
   glfwTerminate();
   return 0;
 }

src/stb_images.c

@@ -0,0 +1,2 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"