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Add simple textured quad with OpenGL 3.0
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3 files changed

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‎res/org/lwjgl/demo/opengl/textures/texturedQuad.fs‎

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#version 130
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uniform sampler2D tex;
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in vec2 texCoordsVarying;
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out vec4 color;
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void main() {
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color = texture(tex, texCoordsVarying);
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}

‎res/org/lwjgl/demo/opengl/textures/texturedQuad.vs‎

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#version 130
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in vec3 position;
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in vec2 texCoords;
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out vec2 texCoordsVarying;
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void main() {
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texCoordsVarying = texCoords;
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gl_Position = vec4(position, 1.0);
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}

‎src/org/lwjgl/demo/opengl/textures/SimpleTexturedQuad.java‎

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/*
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* Copyright LWJGL. All rights reserved.
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* License terms: http://lwjgl.org/license.php
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*/
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package org.lwjgl.demo.opengl.textures;
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import org.lwjgl.BufferUtils;
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import org.lwjgl.glfw.*;
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import org.lwjgl.opengl.GL;
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import org.lwjgl.opengl.GLCapabilities;
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import org.lwjgl.opengl.GLUtil;
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import org.lwjgl.system.Callback;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.FloatBuffer;
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import java.nio.IntBuffer;
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import static org.lwjgl.demo.opengl.util.DemoUtils.*;
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import static org.lwjgl.glfw.GLFW.*;
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import static org.lwjgl.opengl.GL11.*;
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import static org.lwjgl.opengl.GL15.*;
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import static org.lwjgl.opengl.GL20.*;
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import static org.lwjgl.opengl.GL30.*;
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import static org.lwjgl.stb.STBImage.*;
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import static org.lwjgl.system.MemoryUtil.*;
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/**
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* Renders a simple textured quad using OpenGL 3.0.
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*
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* @author Kai Burjack
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*/
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public class SimpleTexturedQuad {
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long window;
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int width = 1024;
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int height = 768;
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int vao;
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int quadProgram;
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int quadProgram_inputPosition;
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int quadProgram_inputTextureCoords;
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GLCapabilities caps;
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GLFWKeyCallback keyCallback;
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Callback debugProc;
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void init() throws IOException {
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
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glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
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glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);
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window = glfwCreateWindow(width, height, "Simple textured quad", NULL, NULL);
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glfwSetKeyCallback(window, keyCallback = new GLFWKeyCallback() {
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public void invoke(long window, int key, int scancode, int action, int mods) {
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if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE)
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glfwSetWindowShouldClose(window, true);
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}
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});
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glfwMakeContextCurrent(window);
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glfwShowWindow(window);
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IntBuffer framebufferSize = BufferUtils.createIntBuffer(2);
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nglfwGetFramebufferSize(window, memAddress(framebufferSize), memAddress(framebufferSize) + 4);
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width = framebufferSize.get(0);
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height = framebufferSize.get(1);
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caps = GL.createCapabilities();
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debugProc = GLUtil.setupDebugMessageCallback();
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createTexture();
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createQuadProgram();
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createFullScreenQuad();
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}
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void createQuadProgram() throws IOException {
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int program = glCreateProgram();
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int vshader = createShader("org/lwjgl/demo/opengl/textures/texturedQuad.vs", GL_VERTEX_SHADER);
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int fshader = createShader("org/lwjgl/demo/opengl/textures/texturedQuad.fs", GL_FRAGMENT_SHADER);
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glAttachShader(program, vshader);
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glAttachShader(program, fshader);
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glLinkProgram(program);
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int linked = glGetProgrami(program, GL_LINK_STATUS);
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String programLog = glGetProgramInfoLog(program);
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if (programLog != null && programLog.trim().length() > 0)
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System.err.println(programLog);
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if (linked == 0)
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throw new AssertionError("Could not link program");
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glUseProgram(program);
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int texLocation = glGetUniformLocation(program, "tex");
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glUniform1i(texLocation, 0);
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quadProgram_inputPosition = glGetAttribLocation(program, "position");
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quadProgram_inputTextureCoords = glGetAttribLocation(program, "texCoords");
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glUseProgram(0);
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this.quadProgram = program;
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}
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void createFullScreenQuad() {
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vao = glGenVertexArrays();
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glBindVertexArray(vao);
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int positionVbo = glGenBuffers();
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FloatBuffer fb = BufferUtils.createFloatBuffer(2 * 6);
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fb.put(-1.0f).put(-1.0f);
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fb.put(1.0f).put(-1.0f);
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fb.put(1.0f).put(1.0f);
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fb.put(1.0f).put(1.0f);
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fb.put(-1.0f).put(1.0f);
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fb.put(-1.0f).put(-1.0f);
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fb.flip();
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glBindBuffer(GL_ARRAY_BUFFER, positionVbo);
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glBufferData(GL_ARRAY_BUFFER, fb, GL_STATIC_DRAW);
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glVertexAttribPointer(quadProgram_inputPosition, 2, GL_FLOAT, false, 0, 0L);
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glEnableVertexAttribArray(quadProgram_inputPosition);
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int texCoordsVbo = glGenBuffers();
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fb = BufferUtils.createFloatBuffer(2 * 6);
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fb.put(0.0f).put(1.0f);
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fb.put(1.0f).put(1.0f);
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fb.put(1.0f).put(0.0f);
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fb.put(1.0f).put(0.0f);
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fb.put(0.0f).put(0.0f);
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fb.put(0.0f).put(1.0f);
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fb.flip();
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glBindBuffer(GL_ARRAY_BUFFER, texCoordsVbo);
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glBufferData(GL_ARRAY_BUFFER, fb, GL_STATIC_DRAW);
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glVertexAttribPointer(quadProgram_inputTextureCoords, 2, GL_FLOAT, true, 0, 0L);
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glEnableVertexAttribArray(quadProgram_inputTextureCoords);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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}
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static void createTexture() throws IOException {
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IntBuffer width = BufferUtils.createIntBuffer(1);
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IntBuffer height = BufferUtils.createIntBuffer(1);
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IntBuffer components = BufferUtils.createIntBuffer(1);
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ByteBuffer data = stbi_load_from_memory(ioResourceToByteBuffer("org/lwjgl/demo/opengl/textures/environment.jpg", 1024), width, height, components, 4);
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int id = glGenTextures();
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glBindTexture(GL_TEXTURE_2D, id);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width.get(), height.get(), 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
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stbi_image_free(data);
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}
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void render() {
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glClear(GL_COLOR_BUFFER_BIT);
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glUseProgram(quadProgram);
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glBindVertexArray(vao);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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glBindVertexArray(0);
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glUseProgram(0);
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}
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void loop() {
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while (!glfwWindowShouldClose(window)) {
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glfwPollEvents();
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glViewport(0, 0, width, height);
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render();
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glfwSwapBuffers(window);
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}
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}
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void run() throws IOException {
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init();
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loop();
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if (debugProc != null)
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debugProc.free();
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keyCallback.free();
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glfwDestroyWindow(window);
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glfwTerminate();
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}
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public static void main(String[] args) throws IOException {
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new SimpleTexturedQuad().run();
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}
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}

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