英文:
Skybox does not show textures
问题
我的天空盒被显示出来了，但是加载的纹理并没有显示出来，而是显示为黑色。
我正在使用具有多重采样帧缓冲支持的渲染器（链接：https://github.com/LWJGL/lwjgl3-demos/blob/master/src/org/lwjgl/demo/opengl/fbo/MultisampledFbo2Demo.java）。
我的纹理加载代码如下：
private int loadSkyboxTextures(){
int texID = glGenTextures();
glBindTexture(GL_TEXTURE_CUBE_MAP, texID);
for(int i = 0; i < TEXTURE_FILES.length; i++){
InputStream file = getClass().getResourceAsStream(TEXTURE_FILES[i]);
byte[] pixelData = new byte[0];
try {
pixelData = new byte[file.available()];
file.read(pixelData);
} catch (IOException e) {
e.printStackTrace();
}
ByteBuffer byteBuffer = ByteBuffer.wrap(pixelData);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, 512, 512, 0,
GL_RGB, GL_UNSIGNED_BYTE, byteBuffer);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
return texID;
}
立方体渲染代码：
private void drawSkybox(){
glEnable(GL_TEXTURE_CUBE_MAP);
glDepthMask(false);
glGenBuffers(vbo);
glBindBuffer (GL_ARRAY_BUFFER, vbo[0]);
glBufferData(GL_ARRAY_BUFFER, POINTS, GL_STATIC_DRAW);
glGenVertexArrays(vao);
glBindVertexArray(vao[0]);
glVertexAttribPointer(0, 3, GL_FLOAT, false, 3 * Float.BYTES, NULL);
glEnableVertexAttribArray(0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, texId);
glDrawArrays(GL_TRIANGLES, 0, 36);
glDisableVertexAttribArray(0);
glBindVertexArray(0);
glDepthMask(true);
glBindBuffer (GL_ARRAY_BUFFER,0);
glDisable(GL_TEXTURE_CUBE_MAP);
}
在主渲染函数中的立方体渲染调用：
glMatrixMode(GL_PROJECTION);
glOrtho(-max, max, -1, 1, 10, -10);
glRotated(cameraX, 1f, 0f, 0);
glRotated(cameraY, 0f, 1f, 0);
glGetFloatv(GL_PROJECTION_MATRIX, pm);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
drawSkybox();
glLoadIdentity();
...
// 渲染其他物体
英文:
My skybox is displayed, but does not display the textures that I load from the image. Instead, it shows the black color.
I am using a render with MultisampledFbo support.
My texture loading code looks like this:
private int loadSkyboxTextures(){
int texID = glGenTextures();
glBindTexture(GL_TEXTURE_CUBE_MAP, texID);
for(int i = 0; i < TEXTURE_FILES.length; i++){
InputStream file = getClass().getResourceAsStream(TEXTURE_FILES[i]);
byte[] pixelData = new byte[0];
try {
pixelData = new byte[file.available()];
file.read(pixelData);
} catch (IOException e) {
e.printStackTrace();
}
ByteBuffer byteBuffer = ByteBuffer.wrap(pixelData);
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, 512, 512, 0,
GL_RGB, GL_UNSIGNED_BYTE, byteBuffer);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
return texID;
}
Cube Render Code:
private void drawSkybox(){
glEnable(GL_TEXTURE_CUBE_MAP);
glDepthMask(false);
glGenBuffers(vbo);
glBindBuffer (GL_ARRAY_BUFFER, vbo[0]);
glBufferData(GL_ARRAY_BUFFER, POINTS, GL_STATIC_DRAW);
glGenVertexArrays(vao);
glBindVertexArray(vao[0]);
glVertexAttribPointer(0, 3, GL_FLOAT, false, 3 * Float.BYTES, NULL);
glEnableVertexAttribArray(0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, texId);
glDrawArrays(GL_TRIANGLES, 0, 36);
glDisableVertexAttribArray(0);
glBindVertexArray(0);
glDepthMask(true);
glBindBuffer (GL_ARRAY_BUFFER,0);
glDisable(GL_TEXTURE_CUBE_MAP);
}
The cube rendering call in the main render function:
glMatrixMode(GL_PROJECTION);
glOrtho(-max, max, -1, 1, 10, -10);
glRotated(cameraX, 1f, 0f, 0);
glRotated(cameraY, 0f, 1f, 0);
glGetFloatv(GL_PROJECTION_MATRIX, pm);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
drawSkybox();
glLoadIdentity();
...
//render other objects
答案1
得分: 1
Legacy OpenGL的纹理映射必须被启用。为了执行立方体映射纹理，必须启用GL_TEXTURE_CUBE_MAP（参见glEnable）：
glEnable(GL_TEXTURE_CUBE_MAP);
注意，对于立方体贴图纹理，纹理坐标是三维的，并被视为从立方体贴图中心开始的向量。
英文:
Legacy OpenGL's texturing has to be enabled. To perform cube-mapped texturing, GL_TEXTURE_CUBE_MAP has to be enabled (see glEnable):
glEnable(GL_TEXTURE_CUBE_MAP);
Note, for cube map textures, the texture coordinates are 3-dimensional and treated as a vector form the center of the cube map.
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