LWJGL png纹理透明度(textureColour.a白色代替黑色) [英] LWJGL png texture transparency (textureColour.a white color instead of black)
本文介绍了LWJGL png纹理透明度(textureColour.a白色代替黑色)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有由PNG图片纹理化的草模型.我得到的是白色,而不是黑色.为什么会这样,我应该怎么做才能解决该问题?我正在使用 LWJGL 3 和 PNGDecoder.jar
I have grass models textured by PNG pictures. And i get white background color instead of black, which I want to. Why it is so and what should i do to fix that? I am using LWJGL 3 and PNGDecoder.jar
纹理加载器代码:
public int loadTexture(String fileName) {
ByteBuffer buf = null;
int tWidth = 0;
int tHeight = 0;
try {
// Open the PNG file as an InputStream
InputStream in = new FileInputStream("res/" + fileName + ".png");
// Link the PNG decoder to this stream
PNGDecoder decoder = new PNGDecoder(in);
// Get the width and height of the texture
tWidth = decoder.getWidth();
tHeight = decoder.getHeight();
// Decode the PNG file in a ByteBuffer
buf = ByteBuffer.allocateDirect(
4 * decoder.getWidth() * decoder.getHeight());
decoder.decode(buf, decoder.getWidth() * 4, Format.RGBA);
buf.flip();
in.close();
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
// Create a new texture object in memory and bind it
int textureId = GL11.glGenTextures();
GL13.glActiveTexture(textureId);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, textureId);
// All RGB bytes are aligned to each other and each component is 1 byte
GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1);
// Upload the texture data and generate mip maps (for scaling)
GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, tWidth, tHeight, 0,
GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buf);
GL30.glGenerateMipmap(GL11.GL_TEXTURE_2D);
// Setup the ST coordinate system
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
// Setup what to do when the texture has to be scaled
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER,
GL11.GL_NEAREST);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER,
GL11.GL_LINEAR_MIPMAP_LINEAR);
return textureId;
}
推荐答案
如果要使透明纹理看起来透明,则必须首先启用混合.将以下内容放在OpenGL初始化代码中.
If you want transparent textures to look transparent, you have to enable blending first. Put the following somewhere in your OpenGL initialization code.
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
您还在内部以RGB而不是RGBA格式存储纹理.
You are also internally storing your texture in RGB instead of RGBA format.
GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, tWidth, tHeight, 0,
GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buf);
应该成为
GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA8, tWidth, tHeight, 0,
GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buf);
这篇关于LWJGL png纹理透明度(textureColour.a白色代替黑色)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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