Hi,
I'm following the the tutorial from LearnOpenGlTK and i'm trying to display a simple square with a png texture.
I'm using SWT in order to create a window with a GLCanvas to display OpenGL.
I'm able to render a correct square but it turns to brown (wood texture) or red (coke texture) when i'm trying to display the texture. Could you please assist and tell me where I'm wrong ?
Here is my code
public class ShaderDebug {
private static final Logger logger = LogManager.getLogger(ShaderProgram.class.getName());
private GL2 gl = GLContextManager.getInstance().getOpenGLContext().getGL();
private ShaderProgram shader;
private int vbo;
private int vao;
private int ebo;
private Texture texture;
private FloatBuffer dataV;
private IntBuffer dataI;
float[] vertices = {
//Position Texture coordinates
0.5f, 0.5f, 0.0f, 1.0f, 1.0f, // top right
0.5f, -0.5f, 0.0f, 1.0f, 0.0f, // bottom right
-0.5f, -0.5f, 0.0f, 0.0f, 0.0f, // bottom left
-0.5f, 0.5f, 0.0f, 0.0f, 1.0f // top left
};
private int[] indices = { // note that we start from 0!
0, 1, 3, // first triangle
1, 2, 3 // second triangle
};
public ShaderDebug() {
_addDataV(vertices);
_addDataI(indices);
}
public void init() {
try {
// VBO
// 1. bind Vertex Array Object
vbo = GLContextManager.getInstance().getOpenGLContext().generateID();
gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, vbo);
// 2. copy our vertices array in a buffer for OpenGL to use
gl.glBufferData(GL2.GL_ARRAY_BUFFER, dataV.capacity() * GLBuffers.SIZEOF_FLOAT, dataV, GL2.GL_STATIC_DRAW);
// EBO
// 1. bind Vertex Array Object
ebo = GLContextManager.getInstance().getOpenGLContext().generateID();
gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, ebo);
// 2. copy our vertices array in a buffer for OpenGL to use
gl.glBufferData(GL2.GL_ELEMENT_ARRAY_BUFFER, dataI.capacity() * GLBuffers.SIZEOF_INT, dataI, GL2.GL_STATIC_DRAW);
// Shader
this.shader = ShaderProgramManager.getShaderProgram();
this.shader.use();
// Texture
ClassLoader classLoader = ClassLoader.getSystemClassLoader();
URL resource = classLoader.getResource("images/container.png");
if (resource == null) {
throw new IllegalArgumentException("file not found!");
}
File file = new File(resource.getFile());
texture = TextureIO.newTexture(file, true);
texture.setMustFlipVertically(true);
texture.enable(gl);
texture.bind(gl);
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MIN_FILTER, (GL2.GL_LINEAR));
texture.setTexParameteri(gl, GL2.GL_TEXTURE_MAG_FILTER, (GL2.GL_LINEAR));
// VAO
// 1. bind VAO, VBO, EBO
gl.glBindVertexArray(vao);
gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, vbo);
gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, ebo);
// vertexLocation
int vertexLocation = shader.GetAttribLocation("aPosition");
gl.glEnableVertexAttribArray(vertexLocation);
gl.glVertexAttribPointer(vertexLocation, 3, GL2.GL_FLOAT, false, 5 * GLBuffers.SIZEOF_FLOAT, 0);
// texCoordLocation
int texCoordLocation = shader.GetAttribLocation("aTexCoord");
gl.glEnableVertexAttribArray(texCoordLocation);
gl.glVertexAttribPointer(texCoordLocation, 2, GL2.GL_FLOAT, false, 5 * GL2.GL_FLOAT, 3 * GL2.GL_FLOAT);
} catch (Exception e) {
logger.error("Error while creating shader", e);
}
}
public void render() {
//gl.glClear(GL2.GL_COLOR_BUFFER_BIT);
// bind VAO
gl.glBindVertexArray(vao);
// texture
texture.enable(gl);
texture.bind(gl);
// shader
shader.use();
// draw elements
gl.glDrawElements(GL2.GL_TRIANGLES, indices.length, GL2.GL_UNSIGNED_INT, 0);
// gl.glFlush();
}
public void _addDataV(float[] data) {
this.dataV = FloatBuffer.wrap(data);
this.dataV.rewind();
}
public void _addDataI(int[] data) {
this.dataI = IntBuffer.wrap(data);
this.dataI.rewind();
}
}
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