我正在渲染一个简单的四边形并且一直在尝试使用着色器。它工作得很好，但我按照纹理教程添加纹理，我必须改变一些东西。因为现在，即使所有纹理代码都被注释掉了，当我打开着色器时四边形也不会渲染。我怀疑它与数据绑定有关，因为我仍在努力学习它。我不能为我的生活发现什么是错的！
着色器（顶点和片段）：
//vertex
#version 400 core
in vec3 position;
out vec3 colour;
void main (void) {
colour = vec3(position.x + 0.5, 1.0, position.y + 0.5);
}
//fragment
#version 400 core
in vec3 colour;
out vec4 out_Colour;
void main (void) {
out_Colour = vec4(colour, 1.0);
}
着色器程序：
public abstract class ShaderProgram {
private int programId;
private int vertexId;
private int fragmentId;
public ShaderProgram (String vertexFile, String fragmentFile) {
vertexId = loadShader(vertexFile, GL20.GL_VERTEX_SHADER);
fragmentId = loadShader(fragmentFile, GL20.GL_FRAGMENT_SHADER);
programId = GL20.glCreateProgram();
GL20.glAttachShader(programId, vertexId);
GL20.glAttachShader(programId, fragmentId);
bindAttributes();
GL20.glLinkProgram(programId);
GL20.glValidateProgram(programId);
}
public void start () {
GL20.glUseProgram(programId);
}
public void stop () {
GL20.glUseProgram(0);
}
public void cleanUp () {
stop();
GL20.glDetachShader(programId, vertexId);
GL20.glDetachShader(programId, fragmentId);
GL20.glDeleteShader(vertexId);
GL20.glDeleteShader(fragmentId);
GL20.glDeleteProgram(programId);
}
protected abstract void bindAttributes ();
protected void bindAttribute (int attribute, String variableName) {
GL20.glBindAttribLocation(programId, attribute, variableName);
}
private static int loadShader (String file, int type) {
StringBuilder shaderSource = new StringBuilder();
try {
BufferedReader reader = new BufferedReader(new FileReader(file));
String line;
while ((line = reader.readLine()) != null) {
shaderSource.append(line).append("\n");
}
reader.close();
} catch (IOException e) {
System.err.println("Could not read shader file!");
e.printStackTrace();
System.exit(-1);
}
int shaderId = GL20.glCreateShader(type);
GL20.glShaderSource(shaderId, shaderSource);
GL20.glCompileShader(shaderId);
if (GL20.glGetShaderi(shaderId, GL20.GL_COMPILE_STATUS) == GL11.GL_FALSE) {
System.err.println(GL20.glGetShaderInfoLog(shaderId));
System.err.println("Could not compile shader!");
System.exit(-1);
}
return shaderId;
}
}
主着色器（扩展着色器程序）：
public class MainShader extends ShaderProgram {
private static final String VERTEX_FILE = "src/shaders/vertexShader.txt";
private static final String FRAGMENT_FILE = "src/shaders/fragmentShader.txt";
public MainShader() {
super(VERTEX_FILE, FRAGMENT_FILE);
}
@Override
protected void bindAttributes() {
super.bindAttribute(ModelLoader.VERTEX_INDICE, "position");
//super.bindAttribute(1, "uv");
}
}
模型加载器：
public class ModelLoader {
private static List<Integer> vaos = new ArrayList<Integer>();
private static List<Integer> vbos = new ArrayList<Integer>();
private static List<Integer> textures = new ArrayList<Integer>();
public static final int VERTEX_INDICE = 0;
public static final int UV_INDICE = 1;
public static RawModel loadToVAO (float[] positions, int[] indices) {
int vaoId = createVAO();
bindIndicesBuffer(indices);
storeDataInAttributeList(VERTEX_INDICE, 3, positions);
//storeDataInAttributeList(UV_INDICE, 2, uvCoords);
unbindVAO();
return new RawModel(vaoId, indices.length);
}
/*public static int loadTexture (String file, int textureUnit) {
try {
return TextureLoader.loadTexture("rsrc/" + file + ".png", GL11.GL_TEXTURE_2D);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return 0;
}*/
public static int loadTexture(String file, int textureUnit) {
String filename = "rsrc/" + file + ".png";
ByteBuffer buf = null;
int tWidth = 0;
int tHeight = 0;
try {
// Open the PNG file as an InputStream
InputStream in = new FileInputStream(filename);
// Link the PNG decoder to this stream
PNGDecoder decoder = new PNGDecoder(in);
// Get the width and height of the texture
tWidth = decoder.getWidth();
tHeight = decoder.getHeight();
// Decode the PNG file in a ByteBuffer
buf = ByteBuffer.allocateDirect(
4 * decoder.getWidth() * decoder.getHeight());
decoder.decode(buf, decoder.getWidth() * 4, Format.RGBA);
buf.flip();
in.close();
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
// Create a new texture object in memory and bind it
int texId = GL11.glGenTextures();
GL13.glActiveTexture(textureUnit);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, texId);
// All RGB bytes are aligned to each other and each component is 1 byte
GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1);
// Upload the texture data and generate mip maps (for scaling)
GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, tWidth, tHeight, 0,
GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buf);
GL30.glGenerateMipmap(GL11.GL_TEXTURE_2D);
// Setup the ST coordinate system
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
// Setup what to do when the texture has to be scaled
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER,
GL11.GL_NEAREST);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER,
GL11.GL_LINEAR_MIPMAP_LINEAR);
return texId;
}
private static int createVAO () {
int vaoId = GL30.glGenVertexArrays();
vaos.add(vaoId);
GL30.glBindVertexArray(vaoId);
return vaoId;
}
private static void bindIndicesBuffer (int[] indices) {
int vbo = GL15.glGenBuffers();
vbos.add(vbo);
GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, vbo);
IntBuffer buffer = storeDataInIntBuffer(indices);
GL15.glBufferData(GL15.GL_ELEMENT_ARRAY_BUFFER, buffer, GL15.GL_STATIC_DRAW);
}
public static void cleanUp () {
for (int vao : vaos) {
GL30.glDeleteVertexArrays(vao);
}
for (int vbo : vbos) {
GL15.glDeleteBuffers(vbo);
}
for (int texture : textures) {
GL11.glDeleteTextures(texture);
}
}
private static void storeDataInAttributeList (int attributeNumber, int size, float[] data) {
int vboId = GL15.glGenBuffers();
vbos.add(vboId);
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboId);
FloatBuffer buffer = storeDataInFloatBuffer(data);
GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buffer, GL15.GL_STATIC_DRAW);
GL20.glVertexAttribPointer(attributeNumber, size, GL11.GL_FLOAT, false, 0, 0);
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
}
private static void unbindVAO () {
GL30.glBindVertexArray(0);
}
private static IntBuffer storeDataInIntBuffer (int[] data) {
IntBuffer buffer = BufferUtils.createIntBuffer(data.length);
buffer.put(data);
buffer.flip();
return buffer;
}
private static FloatBuffer storeDataInFloatBuffer (float[] data) {
FloatBuffer buffer = BufferUtils.createFloatBuffer(data.length);
buffer.put(data);
buffer.flip();
return buffer;
}
}
答案 0 :(得分：0)
我忘了在顶点着色器中指定gl_Position。