我用VBO编写了一个小程序,但是纹理失败了。加载它们很好,但它们不会显示。因此,我为VBO纹理编写了一个小的纹理渲染器,并采用了本主题中的内容:VBO with texture in LWJGL。 但仍然没有任何渲染。 帮我吧,让这段代码显示一个纹理;)
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL15.*;
import java.io.IOException;
import java.nio.FloatBuffer;
import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;
public class VBOTextureDemo {
private static Texture texture;
public static void main(String[] args) {
try {
Display.setDisplayMode(new DisplayMode(500, 500));
Display.setTitle("Texture");
Display.create();
} catch (LWJGLException e) {
e.printStackTrace();
Display.destroy();
System.exit(1);
}
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(1, -1, 1, -1, 1, 1);
glMatrixMode(GL_MODELVIEW);
glEnable(GL_TEXTURE_2D);
glLoadIdentity();
try {
texture = TextureLoader.getTexture("PNG",
ResourceLoader.getResourceAsStream("res/images/grass.png"));
} catch (IOException e) {
e.printStackTrace();
}
final int amountOfVertices = 6;
final int vertexSize = 3;
final int texSize = 2;
FloatBuffer vertexData = BufferUtils.createFloatBuffer(amountOfVertices
* vertexSize);
vertexData.put(new float[] { -10f, 10f, 0f, }); // Vertex
vertexData.put(new float[] { 10f, 10f, 0f, }); // Vertex
vertexData.put(new float[] { -10f, -10f, 0f, }); // Vertex
vertexData.put(new float[] { 10f, -10f, 0f, }); // Vertex
vertexData.put(new float[] { -10f, -10f, 0f, }); // Vertex
vertexData.put(new float[] { 10f, 10f, 0f, }); // Vertex;
vertexData.flip();
FloatBuffer textureData = BufferUtils
.createFloatBuffer(amountOfVertices * texSize);
textureData.put(new float[] { 0f, 1f, }); // Texture Coordinate
textureData.put(new float[] { 1f, 1f, }); // Texture Coordinate
textureData.put(new float[] { 0f, 0f, }); // Texture Coordinate
textureData.put(new float[] { 1f, 0f, }); // Texture Coordinate
textureData.put(new float[] { 0f, 0f, }); // Texture Coordinate
textureData.put(new float[] { 1f, 1f, }); // Texture Coordinate
textureData.flip();
glBindTexture(GL_TEXTURE_2D, texture.getTextureID());
texture.bind();
int vboVertexHandle = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vboVertexHandle);
glBufferData(GL_ARRAY_BUFFER, vertexData, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
int vboTexCoordHandle = texture.getTextureID();
glBindBuffer(GL_ARRAY_BUFFER, vboTexCoordHandle);
glBufferData(GL_ARRAY_BUFFER, textureData, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glClearColor(0.5f, 0.1f, 0f, 1f);
while (!Display.isCloseRequested()) {
glClear(GL_COLOR_BUFFER_BIT);
glBindBuffer(GL_ARRAY_BUFFER, vboVertexHandle);
glVertexPointer(vertexSize, GL_FLOAT, 0, 0L);
glBindBuffer(GL_ARRAY_BUFFER, vboTexCoordHandle);
glTexCoordPointer(2, GL_FLOAT, 0, 0);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glDrawArrays(GL_TRIANGLES, 0, amountOfVertices);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
Display.update();
Display.sync(60);
}
glDeleteBuffers(vboVertexHandle);
glDeleteBuffers(vboTexCoordHandle);
texture.release();
Display.destroy();
System.exit(0);
}
}
答案 0 :(得分:2)
我没有对你的代码进行测试,但我认为有两件事可能会出现问题!
仅用于测试尝试使用已弃用的方法
glBegin(GL_TRIANGLES);
glVertex3f(x, y, z);
glTexCoord2f(u, v);
记住当然要绑定纹理,但如果使用不推荐使用的方法渲染三角形,那么它肯定不是纹理问题。虽然如果没有任何东西出现,它可能是一个纹理程序(或顶点的顺序错误)。
texture.bind();
glBegin(GL_TRIANGLES);
glTexCoord2f(0f, 1f);
glVertex3f(-1f, 1f, 0f);
glTexCoord2f(1f, 1f);
glVertex3f(1f, 1f, 0f);
glTexCoord2f(0f, 0f);
glVertex3f(-1f, -1f, 0f);
glTexCoord2f(1f, 0f);
glVertex3f(1f, -1f, 0f);
glTexCoord2f(0f, 0f);
glVertex3f(-1f, -1f, 0f);
glTexCoord2f(1f, 1f);
glVertex3f(1f, 1f, 0f);
glEnd();
texture.unbind();
因此,如果它没有显示的原因是由于顶点的顺序错误,那么请尝试使用以下代码来创建和渲染纹理VBO。
int vertices = 6;
int vertex_size = 3; // X, Y, Z,
int texture_size = 2; // U, V,
FloatBuffer vertex_data = BufferUtils.createFloatBuffer(vertices * vertex_size);
vertex_data.put(new float[] { -1f, 1f, 0f, }); // Vertex
vertex_data.put(new float[] { 1f, 1f, 0f, }); // Vertex
vertex_data.put(new float[] { -1f, -1f, 0f, }); // Vertex
vertex_data.put(new float[] { 1f, -1f, 0f, }); // Vertex
vertex_data.put(new float[] { -1f, -1f, 0f, }); // Vertex
vertex_data.put(new float[] { 1f, 1f, 0f, }); // Vertex
FloatBuffer texture_data = BufferUtils.createFloatBuffer(vertices * texture_size);
texture_data.put(new float[] { 0f, 1f, }); // Texture Coordinate
texture_data.put(new float[] { 1f, 1f, }); // Texture Coordinate
texture_data.put(new float[] { 0f, 0f, }); // Texture Coordinate
texture_data.put(new float[] { 1f, 0f, }); // Texture Coordinate
texture_data.put(new float[] { 0f, 0f, }); // Texture Coordinate
texture_data.put(new float[] { 1f, 1f, }); // Texture Coordinate
vertex_data.flip();
texture_data.flip();
int vbo_vertex_handle = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vbo_vertex_handle);
glBufferData(GL_ARRAY_BUFFER, vertex_data, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
int vbo_texture_handle = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vbo_texture_handle);
glBufferData(GL_ARRAY_BUFFER, texture_data, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
还尝试实际绑定和解除绑定纹理!实际上,这也可能是一种奇怪的问题。
texture.bind();
glBindBuffer(GL_ARRAY_BUFFER, vbo_vertex_handle);
glVertexPointer(vertex_size, GL_FLOAT, 0, 0l);
glBindBuffer(GL_ARRAY_BUFFER, vbo_texture_handle);
glTexCoordPointer(texture_size, GL_FLOAT, 0, 0l);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glDrawArrays(GL_TRIANGLES, 0, vertices); // The vertices is of course the max vertices count, in this case 6
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
glBindBuffer(GL_ARRAY_BUFFER, 0);
texture.unbind();
当然使用纹理时,请记得调用glEnable(GL_TEXTURE_2D);
我在代码中发现了错误,实际上是在说。
int vboTexCoordHandle = texture.getTextureID();
glBindBuffer(GL_ARRAY_BUFFER, vboTexCoordHandle);
glBufferData(GL_ARRAY_BUFFER, textureData, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
但你需要说。
int vboTexCoordHandle = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vboTexCoordHandle);
glBufferData(GL_ARRAY_BUFFER, textureData, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);