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Implementation of the "VBO rendering crashed with glDrawArrays" question on Gamedev Stack Exchange.
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import java.nio.ByteBuffer; | |
import java.nio.FloatBuffer; | |
import org.lwjgl.BufferUtils; | |
import org.lwjgl.PointerBuffer; | |
import org.lwjgl.glfw.GLFWDropCallback; | |
import org.lwjgl.glfw.GLFWErrorCallback; | |
import org.lwjgl.glfw.GLFWFramebufferSizeCallback; | |
import org.lwjgl.glfw.GLFWKeyCallback; | |
import org.lwjgl.glfw.GLFWvidmode; | |
import org.lwjgl.opengl.GL; | |
import org.lwjgl.opengl.GL11; | |
import org.lwjgl.opengl.GL15; | |
import org.lwjgl.opengl.GL20; | |
import org.lwjgl.opengl.GLContext; | |
import static org.lwjgl.glfw.Callbacks.*; | |
import static org.lwjgl.glfw.GLFW.*; | |
import static org.lwjgl.opengl.GL11.*; | |
import static org.lwjgl.system.MemoryUtil.*; | |
import static org.lwjgl.opengl.GL20.*; | |
public class Main { | |
private GLFWErrorCallback errorCallback; | |
private GLFWKeyCallback keyCallback; | |
private GLFWFramebufferSizeCallback framebufferCallback; | |
private GLFWDropCallback dropCallback; | |
private long window; | |
int WIDTH = 400; | |
int HEIGHT = 400; | |
int vbo_id; | |
int program; | |
public Main() { | |
setupWindow(); | |
glfwMakeContextCurrent(window); | |
GLContext.createFromCurrent(); | |
GL.createCapabilities(false); | |
init(); | |
while (true) { | |
render(); | |
if ( glfwWindowShouldClose(window) == GL_FALSE ) { | |
glfwPollEvents(); | |
try { | |
Thread.sleep(34); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
} else { | |
break; | |
} | |
try { | |
Thread.sleep(16); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
} | |
} | |
private void setupWindow() { | |
glfwSetErrorCallback(errorCallback = errorCallbackPrint(System.err)); | |
if ( glfwInit() != GL11.GL_TRUE ) | |
throw new IllegalStateException("Unable to initialize GLFW"); | |
glfwDefaultWindowHints(); | |
glfwWindowHint(GLFW_VISIBLE, GL_FALSE); | |
glfwWindowHint(GLFW_RESIZABLE, GL_TRUE); | |
//glfwWindowHint(GLFW_AUTO_ICONIFY, GL_FALSE); // Does not minimize you application when not focus. | |
// Create the window | |
window = glfwCreateWindow(WIDTH, HEIGHT, "Hello World!", NULL, NULL); | |
if ( window == NULL ) | |
throw new RuntimeException("Failed to create the GLFW window"); | |
glfwSetKeyCallback(window, keyCallback = new GLFWKeyCallback() { | |
@Override | |
public void invoke(long window, int key, int scancode, int action, int mods) { | |
if ( key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE ) | |
glfwSetWindowShouldClose(window, GL_TRUE); | |
} | |
}); | |
glfwSetClipboardString(window, "ありがとうございます。 この感じは怖いよ。"); | |
glfwSetDropCallback(window, dropCallback = new GLFWDropCallback() { | |
@Override | |
public void invoke(long window, int count, long names) { | |
PointerBuffer nameBuffer = memPointerBuffer(names, count); | |
for ( int i = 0; i < count; i++ ) { | |
System.out.format("\t%d: %s%n", i + 1, memDecodeUTF8(memByteBufferNT1(nameBuffer.get(i)))); | |
} | |
} | |
}); | |
ByteBuffer vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor()); | |
glfwSetWindowPos( | |
window, | |
(GLFWvidmode.width(vidmode) - WIDTH) / 2, | |
(GLFWvidmode.height(vidmode) - HEIGHT) / 2 | |
); | |
glfwMakeContextCurrent(window); | |
glfwSwapInterval(1); | |
glfwShowWindow(window); | |
/*glfwSetWindowRefreshCallback(window, new GLFWWindowRefreshCallback() { | |
@Override | |
public void invoke(long window) { | |
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); | |
GL20.glUniform1f(time_loc, time); | |
if (time > 1.0f) { | |
time = -1.0f; | |
} | |
time += 0.005f; | |
GL15.glBindBuffer(GL_VERTEX_ARRAY, triangle); | |
GL20.glEnableVertexAttribArray(0); | |
GL20.glVertexAttribPointer(0, 3, GL11.GL_FLOAT, false, 3 * 4, 0L); | |
GL11.glDrawArrays(GL_TRIANGLES, 0, 3); | |
glfwSwapBuffers(window); | |
} | |
});*/ | |
// Resized the viewport if the window is resized. | |
glfwSetFramebufferSizeCallback(window, framebufferCallback = new GLFWFramebufferSizeCallback() { | |
private boolean resize; | |
@Override | |
public void invoke(long window, int width, int height) { | |
resize = true; | |
WIDTH = width; | |
HEIGHT = height; | |
} | |
}); | |
glfwSetWindowTitle(window, "Simple Test"); | |
} | |
private void init() { | |
String vertexsource = "#version 330 core\n" + | |
"uniform mat4 projectionMatrix;\n" + | |
"uniform mat4 viewMatrix;\n" + | |
"uniform mat4 modelMatrix;\n" + | |
"layout (location = 0) in vec3 in_position;\n" + | |
"void main() {\n" + | |
" gl_Position = (projectionMatrix * viewMatrix * modelMatrix) * vec4(in_position, 1.0f);\n" + | |
"}\n"; | |
String fragmentsource = "#version 330 core\n" + | |
"void main() {\n" + | |
"gl_FragColor = vec4(1.0f, 0.0, 1.0f, 1.0f);\n" + | |
"}\n"; | |
int vertex = GL20.glCreateShader(GL20.GL_VERTEX_SHADER); | |
int fragment = GL20.glCreateShader(GL20.GL_FRAGMENT_SHADER); | |
GL20.glShaderSource(vertex, vertexsource); | |
GL20.glShaderSource(fragment, fragmentsource); | |
GL20.glCompileShader(vertex); | |
GL20.glCompileShader(fragment); | |
// Create program from shaders. | |
program = GL20.glCreateProgram(); | |
GL20.glAttachShader(program, vertex); | |
GL20.glAttachShader(program, fragment); | |
GL20.glLinkProgram(program); | |
String info = GL20.glGetProgramInfoLog(program); | |
System.out.println("Program info: " + info); | |
// Set up data | |
float[] vboData = new float[]{0.0f, 0.0f, 0.0f}; | |
FloatBuffer buffer = BufferUtils.createFloatBuffer(vboData.length); | |
buffer.put(vboData); | |
buffer.flip(); | |
vbo_id = GL15.glGenBuffers(); | |
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo_id); | |
GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buffer, GL15.GL_STATIC_DRAW); | |
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0); | |
} | |
private void render() { | |
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); | |
glPointSize(10); | |
glEnableVertexAttribArray(0); | |
GL20.glUseProgram(vbo_id); | |
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo_id); | |
glVertexAttribPointer(0, 3, GL_FLOAT, false, 12, 0); | |
glDrawArrays(GL_POINTS, 0, 1); | |
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0); | |
GL20.glUseProgram(0); | |
glfwSwapBuffers(window); | |
} | |
public static void main(String[] args) { | |
new Main(); | |
} | |
} |
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