天空盒不显示纹理

huangapple
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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：

  1. private int loadSkyboxTextures(){
  2.         int texID = glGenTextures();
  3.         glBindTexture(GL_TEXTURE_CUBE_MAP, texID);
  4.         for(int i = 0; i < TEXTURE_FILES.length; i++){
  5.             InputStream file = getClass().getResourceAsStream(TEXTURE_FILES[i]);
  6.             byte[] pixelData = new byte[0];
  7.             try {
  8.                 pixelData = new byte[file.available()];
  9.                 file.read(pixelData);
  10.             } catch (IOException e) {
  11.                 e.printStackTrace();
  12.             }
  13.             ByteBuffer byteBuffer = ByteBuffer.wrap(pixelData);
  14.             glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, 512, 512, 0,
  15.                     GL_RGB, GL_UNSIGNED_BYTE, byteBuffer);
  16.         }
  18.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  19.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  20.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  21.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  22.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
  24.         return texID;
  25.     }

立方体渲染代码：

  1. private void drawSkybox(){
  2.         glEnable(GL_TEXTURE_CUBE_MAP);
  3.         glDepthMask(false);
  4.         glGenBuffers(vbo);
  5.         glBindBuffer (GL_ARRAY_BUFFER, vbo[0]);
  6.         glBufferData(GL_ARRAY_BUFFER, POINTS, GL_STATIC_DRAW);
  7.         glGenVertexArrays(vao);
  8.         glBindVertexArray(vao[0]);
  9.         glVertexAttribPointer(0, 3, GL_FLOAT, false, 3 * Float.BYTES, NULL);
  10.         glEnableVertexAttribArray(0);
  11.         glActiveTexture(GL_TEXTURE0);
  12.         glBindTexture(GL_TEXTURE_CUBE_MAP, texId);
  13.         glDrawArrays(GL_TRIANGLES, 0, 36);
  14.         glDisableVertexAttribArray(0);
  15.         glBindVertexArray(0);
  16.         glDepthMask(true);
  17.         glBindBuffer (GL_ARRAY_BUFFER,0);
  18.         glDisable(GL_TEXTURE_CUBE_MAP);
  19.     }

在主渲染函数中的立方体渲染调用：

  1.                 glMatrixMode(GL_PROJECTION);
  2.                 glOrtho(-max, max, -1, 1, 10, -10);
  3.                 glRotated(cameraX, 1f, 0f, 0);
  4.                 glRotated(cameraY, 0f, 1f, 0);
  5.                 glGetFloatv(GL_PROJECTION_MATRIX, pm);
  7.                 glMatrixMode(GL_MODELVIEW);
  8.                 glLoadIdentity();
  9.                 drawSkybox();
  10.                 glLoadIdentity();
  11.                 ...
  12.                 // 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:

  1. private int loadSkyboxTextures(){
  2.         int texID = glGenTextures();
  3.         glBindTexture(GL_TEXTURE_CUBE_MAP, texID);
  4.         for(int i = 0; i &lt; TEXTURE_FILES.length; i++){
  5.             InputStream file = getClass().getResourceAsStream(TEXTURE_FILES[i]);
  6.             byte[] pixelData = new byte[0];
  7.             try {
  8.                 pixelData = new byte[file.available()];
  9.                 file.read(pixelData);
  10.             } catch (IOException e) {
  11.                 e.printStackTrace();
  12.             }
  13.             ByteBuffer byteBuffer = ByteBuffer.wrap(pixelData);
  14.             glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, 512, 512, 0,
  15.                     GL_RGB, GL_UNSIGNED_BYTE, byteBuffer);
  16.         }
  18.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  19.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  20.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  21.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  22.         glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
  24.         return texID;
  25.     }

Cube Render Code:

  1.     private void drawSkybox(){
  2.         glEnable(GL_TEXTURE_CUBE_MAP);
  3.         glDepthMask(false);
  4.         glGenBuffers(vbo);
  5.         glBindBuffer (GL_ARRAY_BUFFER, vbo[0]);
  6.         glBufferData(GL_ARRAY_BUFFER, POINTS, GL_STATIC_DRAW);
  7.         glGenVertexArrays(vao);
  8.         glBindVertexArray(vao[0]);
  9.         glVertexAttribPointer(0, 3, GL_FLOAT, false, 3 * Float.BYTES, NULL);
  10.         glEnableVertexAttribArray(0);
  11.         glActiveTexture(GL_TEXTURE0);
  12.         glBindTexture(GL_TEXTURE_CUBE_MAP, texId);
  13.         glDrawArrays(GL_TRIANGLES, 0, 36);
  14.         glDisableVertexAttribArray(0);
  15.         glBindVertexArray(0);
  16.         glDepthMask(true);
  17.         glBindBuffer (GL_ARRAY_BUFFER,0);
  18.         glDisable(GL_TEXTURE_CUBE_MAP);
  19.     }

The cube rendering call in the main render function:

  1.                 glMatrixMode(GL_PROJECTION);
  2.                 glOrtho(-max, max, -1, 1, 10, -10);
  3.                 glRotated(cameraX, 1f, 0f, 0);
  4.                 glRotated(cameraY, 0f, 1f, 0);
  5.                 glGetFloatv(GL_PROJECTION_MATRIX, pm);
  7.                 glMatrixMode(GL_MODELVIEW);
  8.                 glLoadIdentity();
  9.                 drawSkybox();
  10.                 glLoadIdentity();
  11.                 ...
  12.                 //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）：

  1. 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):

  1. 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.

huangapple
  • 本文由 发表于 2020年4月9日 04:50:04
  • 转载请务必保留本文链接：https://go.coder-hub.com/61109787.html
  • java
  • lwjgl
  • opengl
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