我对渲染代码进行了几次优化，但仍然没有渲染，所有可见的都是黑色窗口。它之前有用（使用opengl immedieate模式渲染，但我似乎打破了系统。
Texture.java
import static org.lwjgl.opengl.ARBBufferObject.*;
import static org.lwjgl.opengl.ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB;
import static org.lwjgl.opengl.GL11.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import javax.imageio.ImageIO;
import org.lwjgl.BufferUtils;
import org.lwjgl.util.ReadableColor;
public class Texture {
public static Texture font1;
public static Texture smallButton1;
public static Texture smallButton1Hover;
public static Texture background1;
public static Texture title1;
public static Texture smallTextBox1;
public static Texture largeTextBox1;
final String file;
boolean loaded = false;
private ByteBuffer buffer;
public final int width, height;
public static void loadTextures() {
font1 = new Texture("/fonts/font1.png");
background1 = new Texture("/textures/background1.png");
title1 = new Texture("/textures/title1.png");
smallButton1 = new Texture("/textures/smallButton1.png");
smallButton1Hover = new Texture("/textures/smallButton1Hover.png");
smallTextBox1 = new Texture("/textures/smallTextBox1.png");
largeTextBox1 = new Texture("/textures/largeTextBox1.png");
}
public Texture(String path) {
BufferedImage image = null;
try {
image = ImageIO.read(TacAttack.class.getResourceAsStream(path));
int BYTES_PER_PIXEL = 4;
int[] pixels = new int[image.getWidth() * image.getHeight()];
image.getRGB(0, 0, image.getWidth(), image.getHeight(), pixels, 0, image.getWidth());
buffer = BufferUtils.createByteBuffer(image.getWidth() * image.getHeight() * BYTES_PER_PIXEL); //4bytes for RGBA
for (int y = 0; y < image.getHeight(); y++) {
for (int x = 0; x < image.getWidth(); x++) {
int pixel = pixels[y * image.getWidth() + x];
buffer.put((byte) ((pixel >> 16) & 0xFF)); // Red component
buffer.put((byte) ((pixel >> 8) & 0xFF)); // Green component
buffer.put((byte) (pixel & 0xFF)); // Blue component
buffer.put((byte) ((pixel >> 24) & 0xFF)); // Alpha component
}
}
buffer.flip();
loaded = true;
System.out.println("Loaded texture: \"" + path + "\"");
} catch (IOException e) {
e.printStackTrace();
ErrorHandler.fatalError(ErrorType.IOError, "Couldn't load texture: " + path);
}
this.file = path;
this.width = image.getWidth();
this.height = image.getHeight();
}
public ByteBuffer getBuffer() {
if (!loaded) {
ErrorHandler.fatalError(ErrorType.textureError, "Buffer requested before texture loaded.");
return null;
} else {
return buffer;
}
}
private void use(int texID, ReadableColor color) {
glEnable(GL_TEXTURE_2D);
glColor4b(color.getRedByte(), color.getGreenByte(), color.getBlueByte(), color.getAlphaByte());
glBindTexture(GL_TEXTURE_2D, texID);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
private void endUse() {
glDisable(GL_BLEND);
glDisable(GL_TEXTURE_2D);
}
public void render(int texID, IntBuffer vBuffer, FloatBuffer tBuffer, boolean changed, int vHandle, int tHandle, ReadableColor color) {
if (!loaded) {
return;
}
System.out.println("");
System.out.println(">>");
System.out.println("apparently rendered at: x" + vBuffer.get(0) + ", y" + vBuffer.get(1) + ", w" + (vBuffer.get(4) - vBuffer.get(0)) + ", h" + (vBuffer.get(5) - vBuffer.get(1)) + " with vHandle - " + vHandle + ", " + file);
System.out.println("apparent texturecoords: x" + tBuffer.get(0) + ", y" + tBuffer.get(1) + ", w" + (tBuffer.get(4) - tBuffer.get(0)) + ", h" + (tBuffer.get(5) - tBuffer.get(1)) + " with tHandle - " + tHandle);
use(texID, color);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, vHandle);
if (changed) {
glBufferDataARB(GL_ARRAY_BUFFER_ARB, vBuffer, GL_STATIC_DRAW_ARB);
System.out.println("yeah");
}
glVertexPointer(2, GL_INT, 2 * 4, 0L);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, tHandle);
if (changed) {
glBufferDataARB(GL_ARRAY_BUFFER_ARB, tBuffer, GL_STATIC_DRAW_ARB);
System.out.println("yeah2");
}
glTexCoordPointer(2, GL_FLOAT, 2 * 4, 0L);
glDrawArrays(GL_QUADS, 0, 4);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
endUse();
}
}
TextureObject.java
import static org.lwjgl.opengl.ARBBufferObject.glGenBuffersARB;
import static org.lwjgl.opengl.GL11.*;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL12;
import org.lwjgl.util.Color;
import org.lwjgl.util.ReadableColor;
public class TextureObject {
private final Texture texture;
public final int width, height;
private final int texID;
private IntBuffer vBuffer;
private FloatBuffer tBuffer;
private boolean changed = true;
private IntBuffer ib = BufferUtils.createIntBuffer(2);
private final int vHandle;
private final int tHandle;
public TextureObject(Texture texture) {
this.texture = texture;
this.width = texture.width;
this.height = texture.height;
texID = glGenTextures();
glBindTexture(GL_TEXTURE_2D, texID);
//Setup wrap mode
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL12.GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL12.GL_CLAMP_TO_EDGE);
//Setup texture scaling filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
//Send tex data to OpenGL
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture.getBuffer());
vBuffer = BufferUtils.createIntBuffer(8);
tBuffer = BufferUtils.createFloatBuffer(8);
vBuffer.put(0).put(0).put(0).put(0).put(0).put(0).put(0).put(0);
tBuffer.put(0).put(0).put(0).put(0).put(0).put(0).put(0).put(0);
glGenBuffersARB(ib);
vHandle = ib.get(0);
tHandle = ib.get(1);
}
public void render(int sx, int sy, int swidth, int sheight) {
updateBuffers(sx, sy, swidth, sheight, 0, 0, 1, 1);
texture.render(texID, vBuffer, tBuffer, changed, vHandle, tHandle, Color.WHITE);
}
public void render(int sx, int sy, int swidth, int sheight, ReadableColor color) {
updateBuffers(sx, sy, swidth, sheight, 0, 0, 1, 1);
texture.render(texID, vBuffer, tBuffer, changed, vHandle, tHandle, color);
}
public void render(int sx, int sy, int swidth, int sheight, float tx, float ty, float twidth, float theight) {
updateBuffers(sx, sy, swidth, sheight, tx, ty, twidth, theight);
texture.render(texID, vBuffer, tBuffer, changed, vHandle, tHandle, Color.WHITE);
}
public void render(int sx, int sy, int swidth, int sheight, float tx, float ty, float twidth, float theight, ReadableColor color) {
updateBuffers(sx, sy, swidth, sheight, tx, ty, twidth, theight);
texture.render(texID, vBuffer, tBuffer, changed, vHandle, tHandle, color);
}
private void updateBuffers(int sx, int sy, int swidth, int sheight, float tx, float ty, float twidth, float theight) {
IntBuffer tempVertexBuffer = BufferUtils.createIntBuffer(8);
FloatBuffer tempTextureCoordsBuffer = BufferUtils.createFloatBuffer(8);
tempVertexBuffer.clear();
tempTextureCoordsBuffer.clear();
tempVertexBuffer.put(sx).put(sy);
tempVertexBuffer.put(sx + swidth).put(sy);
tempVertexBuffer.put(sx + swidth).put(sy + sheight);
tempVertexBuffer.put(sx).put(sy + sheight);
float ttx = tx / (float) texture.width;
float tty = ty / (float) texture.height;
tempTextureCoordsBuffer.put(ttx).put(tty);
tempTextureCoordsBuffer.put(ttx + twidth).put(tty);
tempTextureCoordsBuffer.put(ttx + twidth).put(tty + theight);
tempTextureCoordsBuffer.put(ttx).put(tty + theight);
for (int i = 0; i < 8; i++) {
if (vBuffer.get(i) != tempVertexBuffer.get(i)) {
vBuffer.clear();
tempVertexBuffer.flip();
vBuffer.put(tempVertexBuffer);
vBuffer.flip();
changed = true;
break;
} else {
changed = false;
}
}
for (int i = 0; i < 8; i++) {
if (tBuffer.get(i) != tempTextureCoordsBuffer.get(i)) {
tBuffer.clear();
tempTextureCoordsBuffer.flip();
tBuffer.put(tempTextureCoordsBuffer);
tBuffer.flip();
changed = true;
break;
} else {
changed = false;
}
}
}
}
通过调用“TextureObject.render（args）”渲染所有纹理，“Texture.render（args）”的控制台输出都是正确的。
我没有错误，但没有渲染，所以我怀疑纹理本身会变成一堆零。
也许来自TextueObject.java的这一行？
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture.getBuffer());
或与此相关？ ：）
buffer.flip();
几天都无法解决这个问题......
答案 0 :(得分：1)
好吧，经过大量时间玩这个，我应该知道问题不在于缓冲区。
问题原来是来自Texture.java的这一行：
glColor4b(color.getRedByte(), color.getGreenByte(), color.getBlueByte(), color.getAlphaByte());
显然将颜色设置为黑色。
然而，当我尝试时，这是有效的（感谢“Full Frontal Nudity”帮助我发现这一点）：
glColor4f((float) color.getRed() / 255f, (float) color.getGreen() / 255f, (float) color.getBlue() / 255f, (float) color.getAlpha() / 255f);
似乎ReadableColor返回的字节不是lwjgl需要的字节类型......
但是，它现在有效！