OpenGL ES 2.0/3.0 中带位图的立方体贴图纹理
Cubemap texture with bitmap in OpenGL ES 2.0/3.0
当我用简单的颜色创建立方体贴图纹理时,效果很好:
@JvmStatic
fun createSimpleTextureCubemap() {
val textureId = IntArray(1)
val cubeFace0 = byteArrayOf(127, 127, 127)
val cubeFace1 = byteArrayOf(0, 127, 0)
... // create other cube faces with simple color
val cubeFaces = ByteBuffer.allocateDirect(3)
glGenTextures(1, textureId, 0)
glBindTexture(GL_TEXTURE_CUBE_MAP, textureId[0])
cubeFaces.put(cubeFace0).position(0)
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB,
1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, cubeFaces)
cubeFaces.put(cubeFace1).position(0)
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGB,
1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, cubeFaces)
...
return textureId[0]
}
但是当我尝试使用位图创建立方体贴图纹理时:
@JvmStatic
fun createTextureCubemap(context: Context, rowID: Int) {
val input = context.resources.openRawResource(rowID)
val bitmap = BitmapFactory.decodeStream(input)
val textureId = IntArray(1)
glGenTextures(1, textureId, 0)
glBindTexture(GL_TEXTURE_CUBE_MAP, textureId[0])
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, bitmap, 0)
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
return textureId[0]
}
然后对象变黑了。有人可能会提出为什么带有位图的立方体贴图不起作用(黑色)?
感谢任何 comment/answer。
立方体贴图的纹理必须是方形的。如评论中所述,使用的位图不是方形的。
来自 glTexImage2D reference(GLUtils.texImage2D
是 glTexImage2D
的便利包装)
GL_INVALID_VALUE is generated if target is one of the six cube map 2D image targets and the width and height parameters are not equal.
当我用简单的颜色创建立方体贴图纹理时,效果很好:
@JvmStatic
fun createSimpleTextureCubemap() {
val textureId = IntArray(1)
val cubeFace0 = byteArrayOf(127, 127, 127)
val cubeFace1 = byteArrayOf(0, 127, 0)
... // create other cube faces with simple color
val cubeFaces = ByteBuffer.allocateDirect(3)
glGenTextures(1, textureId, 0)
glBindTexture(GL_TEXTURE_CUBE_MAP, textureId[0])
cubeFaces.put(cubeFace0).position(0)
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB,
1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, cubeFaces)
cubeFaces.put(cubeFace1).position(0)
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGB,
1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, cubeFaces)
...
return textureId[0]
}
但是当我尝试使用位图创建立方体贴图纹理时:
@JvmStatic
fun createTextureCubemap(context: Context, rowID: Int) {
val input = context.resources.openRawResource(rowID)
val bitmap = BitmapFactory.decodeStream(input)
val textureId = IntArray(1)
glGenTextures(1, textureId, 0)
glBindTexture(GL_TEXTURE_CUBE_MAP, textureId[0])
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, bitmap, 0)
GLUtils.texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, bitmap, 0)
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
return textureId[0]
}
然后对象变黑了。有人可能会提出为什么带有位图的立方体贴图不起作用(黑色)?
感谢任何 comment/answer。
立方体贴图的纹理必须是方形的。如评论中所述,使用的位图不是方形的。
来自 glTexImage2D reference(GLUtils.texImage2D
是 glTexImage2D
的便利包装)
GL_INVALID_VALUE is generated if target is one of the six cube map 2D image targets and the width and height parameters are not equal.