我有一个有关Textures的作业，我尝试在我的立方体上加载图片。尽管如此，当我编译时，我只能看到我的立方体为灰色，但是我不明白为什么。
这是我的Java代码，多维数据集坐标和uv坐标分别来自 传递给着色器：
import static org.lwjgl.opengl.GL11.GL_FLOAT;
import static org.lwjgl.opengl.GL11.GL_TRIANGLES;
import static org.lwjgl.opengl.GL11.glDrawArrays;
import static org.lwjgl.opengl.GL15.GL_ARRAY_BUFFER;
import static org.lwjgl.opengl.GL15.GL_STATIC_DRAW;
import static org.lwjgl.opengl.GL15.glBindBuffer;
import static org.lwjgl.opengl.GL15.glBufferData;
import static org.lwjgl.opengl.GL15.glGenBuffers;
import static org.lwjgl.opengl.GL20.glEnableVertexAttribArray;
import static org.lwjgl.opengl.GL20.glVertexAttribPointer;
import static org.lwjgl.opengl.GL30.*;
import lenz.opengl.AbstractOpenGLBase;
import lenz.opengl.ShaderProgram;
import lenz.opengl.Texture;
public class Aufgabe3undFolgende extends AbstractOpenGLBase {
public Matrix4 matrix = new Matrix4();
public Matrix4 projMatrix = new Matrix4(0.8f,500f);
//Coordinates for cube, which is in the center of the screen
float[] cube = {
-1.0f,-1.0f,-1.0f, // triangle 1 : begin
-1.0f,-1.0f, 1.0f,
-1.0f, 1.0f, 1.0f, // triangle 1 : end
1.0f, 1.0f,-1.0f, // triangle 2 : begin
-1.0f,-1.0f,-1.0f,
-1.0f, 1.0f,-1.0f, // triangle 2 : end
1.0f,-1.0f, 1.0f,
-1.0f,-1.0f,-1.0f,
1.0f,-1.0f,-1.0f,
1.0f, 1.0f,-1.0f,
1.0f,-1.0f,-1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f,-1.0f,
1.0f,-1.0f, 1.0f,
-1.0f,-1.0f, 1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f,-1.0f, 1.0f,
1.0f,-1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f,-1.0f,-1.0f,
1.0f, 1.0f,-1.0f,
1.0f,-1.0f,-1.0f,
1.0f, 1.0f, 1.0f,
1.0f,-1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f,-1.0f,
-1.0f, 1.0f,-1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f,-1.0f,
-1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
1.0f,-1.0f, 1.0f
};
//UV Coordinates for texturing
float[] uvKoord = {
0.0f, 0.0f, // lower-left corner
1.0f, 0.0f, // lower-right corner
0.5f, 1.0f
};
private ShaderProgram shaderProgram;
public static void main(String[] args) {
new Aufgabe3undFolgende().start("CG Aufgabe 3", 700, 700);
}
@Override
protected void init() {
shaderProgram = new ShaderProgram("aufgabe3");
glUseProgram(shaderProgram.getId());
//vao bauen
int vaold = glGenVertexArrays();
glBindVertexArray(vaold);
makeVBOS(0,3,cube);
makeVBOS(1,2,uvKoord);
glEnable(GL_DEPTH_TEST); // z-Buffer activate
Texture texture = new Texture("pikatcu.png");
glBindTexture(GL_TEXTURE_2D, texture.getId());
}
//vbos bauen (jeder vbo ist ein Objekt) -- delete
public void makeVBOS(int index, int size, float[] name) {
int vbold = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vbold);
glBufferData(GL_ARRAY_BUFFER, name, GL_STATIC_DRAW);
glVertexAttribPointer(index,size, GL_FLOAT, false, 0,0);
glEnableVertexAttribArray(index);
}
@Override
public void update() {
matrix = new Matrix4();
matrix.translate(0, 0, -3);
matrix.rotateZ(0.1f);
}
@Override
protected void render() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
int loc
=glGetUniformLocation(shaderProgram.getId(),"viewMatrix");
glUniformMatrix4fv(loc,false,
matrix.getValuesAsArray());
int loc2
=glGetUniformLocation(shaderProgram.getId(),"projMatrix");
glUniformMatrix4fv(loc2,false,
projMatrix.getValuesAsArray());
glDrawArrays(GL_TRIANGLES, 0, 36); // 12*3 indices starting at
0 -> 12 triangles -> 6 squares
}
@Override
public void destroy() {
}
}
这是我的顶点着色器：
#version 330
layout(location=0) in vec3 vertex;
layout(location=1) in vec2 uvKoord;
uniform mat4 viewMatrix;
uniform mat4 projMatrix;
out vec3 vertexColor;
out vec2 uv;
void main(){
vertexColor = vec3(1.0, 0.0, 0.0);
uv=uvKoord;
gl_Position = projMatrix*viewMatrix*vec4(vertex, 1.0);
}
这是我的片段着色器：
#version 330
in vec3 vertexColor;
in vec2 uv;
out vec3 pixelColor;
uniform sampler2D smplr;
void main(){
vec4 texel = texture(smplr,uv);
pixelColor = texel.rgb;
}
有人可以帮助我了解我在做什么错吗？我真的很喜欢解释，而不仅是代码，因为我想了解自己的错误，而不仅是复制代码。预先感谢。
PS：纹理是我的讲师给的。我之所以没有上传，是因为我认为发布时间会太长，但是如果需要，我可以提供。 我正在加载的图片是这个https://mytoys.scene7.com/is/image/myToys/ext/7980544-01.jpg？$ rtf_mt_prod-main_xl $，并且我已将其分辨率更改为256x256。
答案 0 :(得分：1)
顶点坐标及其属性是一组日期。这意味着每个顶点坐标需要一个纹理坐标（u，v）。
正弦，您有36个顶点坐标元组（x，y，z），也需要36个纹理坐标元组（u，v）：
float[] uvKoord = {
// left bottom right bottom right top left bottom right top left top
0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f
};
请注意，纹理坐标的顺序与顶点坐标的顺序匹配：
float[] cube = {
// left
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
// right
1.0f, -1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
1.0f, 1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, 1.0f, 1.0f,
1.0f, -1.0f, 1.0f,
// front
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
// back
-1.0f, 1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
// bottom
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
// top
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
};