Implemented textures

CMakeLists.txt

@@ -10,5 +10,6 @@ find_package(glfw3 CONFIG REQUIRED)
 find_package(glm CONFIG REQUIRED)
 
 add_subdirectory(./source/app)
+add_subdirectory(./source/image)
 add_subdirectory(./source/log)
 add_subdirectory(./source/shader)

assets/shaders/shader.frag

@@ -1,8 +1,24 @@
 #version 150 core
 
-in vec3 _color;
-out vec4 color;
+uniform sampler2D tex;
+uniform float time;
+
+in vec3 color;
+in vec2 coord;
+
+out vec4 outColor;
 
 void main() {
-    color = vec4(_color, 1.0);
+    vec2 sampleCoord;
+
+    if(coord.y < 0.75) {
+        sampleCoord = coord;
+    } else {
+        sampleCoord = vec2(
+            coord.x + 0.025 * sin(time * 1.5 + coord.y * 80.0),
+            (1.0 - coord.y) * 3
+        );
+    }
+
+    outColor = texture(tex, sampleCoord) * vec4(color, 1.0);
 }

assets/shaders/shader.vert

@@ -1,10 +1,14 @@
 #version 150 core
 
-in vec2 position;
-in vec3 color;
-out vec3 _color;
+in vec2 inPos;
+in vec3 inColor;
+in vec2 inCoord;
+
+out vec3 color;
+out vec2 coord;
 
 void main() {
-    _color = color;
-    gl_Position = vec4(position, 0.0, 1.0);
+    color = inColor;
+    coord = inCoord;
+    gl_Position = vec4(inPos, 0.0, 1.0);
 }

source/app/CMakeLists.txt

@@ -1,8 +1,8 @@
 project(UglyMain)
 
 add_executable(${PROJECT_NAME}
-    main.cpp
-    src/App.cpp
+    ./main.cpp
+    ./src/App.cpp
 )
 
 target_include_directories(${PROJECT_NAME}
@@ -13,6 +13,7 @@ target_link_libraries(${PROJECT_NAME}
     GLEW::GLEW
     glfw
     glm::glm
+    stb_image
     UglyLogLib
     UglyShaderLib
 )

source/app/src/App.cpp

@@ -7,6 +7,7 @@
 
 #include "LogUtils.hpp"
 #include "ShaderProgramBuilder.hpp"
+#include "stb_image.h"
 #include "TimestampLog.hpp"
 
 namespace ugly {
@@ -58,9 +59,14 @@ App::App(GLFWwindow *window):
     glfwSetKeyCallback(mpWindow, key_callback_s);
 
     float vertices[] = {
-        .0f, .5f, 1.f, 0.f, 0.f,
-        .5f, -.5f, 0.f, 1.f, 0.f,
-        -.5f, -.5f, 0.f, 0.f, 1.f
+        // Position(3), Color(2), TexCoord(2)
+        -0.75f,  0.75f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // Top-left
+         0.75f,  0.75f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // Top-right
+         0.75f, -0.75f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // Bottom-right
+
+         0.75f, -0.75f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // Bottom-right
+        -0.75f, -0.75f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, // Bottom-left
+        -0.75f,  0.75f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f  // Top-left
     };
 
     GLuint vbo;
@@ -73,23 +79,46 @@ App::App(GLFWwindow *window):
         .attachFromFile(GL_FRAGMENT_SHADER, "assets/shaders/shader.frag")
         .link();
     glUseProgram(shaderProgram);
+    mShaderProgram = shaderProgram;
+
+    GLuint tex;
+    glGenTextures(1, &tex);
+    glBindTexture(GL_TEXTURE_2D, tex);
+    int x, y, n;
+    auto data = stbi_load("assets/textures/bliss.jpg", &x, &y, &n, 3);
+    if(data == nullptr) {
+        log("stbi_load() failed!");
+    }
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, x, y, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    stbi_image_free(data);
 
     GLuint vao;
     glGenVertexArrays(1, &vao);
     glBindVertexArray(vao);
-    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 5*sizeof(float), 0);
-    glEnableVertexAttribArray(0);
-    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 5*sizeof(float), (void*)(2*sizeof(float)));
-    glEnableVertexAttribArray(1);
+    
+    GLint posAttrib = glGetAttribLocation(shaderProgram, "inPos");
+    GLint colorAttrib = glGetAttribLocation(shaderProgram, "inColor");
+    GLint coordAttrib = glGetAttribLocation(shaderProgram, "inCoord");
+    glVertexAttribPointer(posAttrib, 2, GL_FLOAT, GL_FALSE, 7*sizeof(float), 0);
+    glVertexAttribPointer(colorAttrib, 3, GL_FLOAT, GL_FALSE, 7*sizeof(float), (void*)(2*sizeof(float)));
+    glVertexAttribPointer(coordAttrib, 2, GL_FLOAT, GL_FALSE, 7*sizeof(float), (void*)(5*sizeof(float)));
+    glEnableVertexAttribArray(posAttrib);
+    glEnableVertexAttribArray(colorAttrib);
+    glEnableVertexAttribArray(coordAttrib);
 }
 
 
 void App::game_loop() {
+    GLint timeUniform = glGetUniformLocation(mShaderProgram, "time");
+
+    auto startTime = glfwGetTime();
     while(!glfwWindowShouldClose(mpWindow)) {
         glfwPollEvents();
 
+        glUniform1f(timeUniform, glfwGetTime() - startTime);
         glClear(GL_COLOR_BUFFER_BIT);
-        glDrawArrays(GL_TRIANGLES, 0, 3);
+        glDrawArrays(GL_TRIANGLES, 0, 6);
 
         glfwSwapBuffers(mpWindow);
     }

source/app/src/App.hpp

@@ -16,6 +16,7 @@ private:
 
 private:
     GLFWwindow *mpWindow;
+    unsigned int mShaderProgram;
 
 private:
     App(GLFWwindow *window);

source/image/CMakeLists.txt

@@ -0,0 +1,9 @@
+project(stb_image)
+
+add_library(${PROJECT_NAME}
+    ./src/stb_image.c
+)
+
+target_include_directories(${PROJECT_NAME}
+    PUBLIC ./include
+)

source/image/LICENSE.txt

@@ -0,0 +1,37 @@
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

source/image/src/stb_image.c

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