[LWJGL]Minecraft渲染图片覆盖窗口 - 编程开发

冰冷冷

本帖最后由冰冷冷于 2020-5-8 12:14 编辑

我现在先将BufferedImage画到Canvas上
之后使用Display.setParent(canvas) Display.update();
没有任何效果

不知道怎么才能渲染图片覆盖住整个窗口
对opengl不是很了解，求各位大佬轻点喷

纱夜

本帖最后由阴阳师元素祭祀于 2020-5-8 12:35 编辑

~~具体mc版本？forge还是fabric？~~

我的fabric （应该无关）
依赖的mc 依赖的lwjgl
没有BufferedImage和Canvas和Display

如果你要渲染图片覆盖窗口
直接glViewport(0, 0, w, h)
然后从-1, -1画纹理到1 1这个地方即可(cost 6个顶点) (渲染纹理..如果有轮子就用轮子?  没有就用我的方法)

https://learnopengl-cn.github.io/

(-1, 1)    (1, 1)
----------------
|                |
----------------
(-1,-1)    (1, -1)

冰冷冷

阴阳师元素祭祀发表于 2020-5-8 12:31
~~具体mc版本？forge还是fabric？~~

我的fabric （应该无关）

我这用的forge-1.12.2-14.23.5.2847，谢谢大佬指导

冰冷冷

Caused by: java.lang.IllegalArgumentException: Number of remaining buffer elements is 1125387, must be at least 1229760. Because at most 1229760 elements can be returned, a buffer with at least 1229760 elements is required, regardless of actual returned element count

GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, Minecraft.getMinecraft().displayWidth, Minecraft.getMinecraft().displayHeight, 0, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, allocate);

冰冷冷

本帖最后由冰冷冷于 2020-5-8 20:01 编辑

阴阳师元素祭祀发表于 2020-5-8 12:31
~~具体mc版本？forge还是fabric？~~

我的fabric （应该无关）

int i1 = GL11.glGenTextures();
GL11.glBindTexture(GL11.GL_TEXTURE_2D,i1);
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);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB,frame.imageWidth, frame.imageHeight, 0, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE,frame.data);
GL11.glViewport(-1,-1,frame.imageWidth, frame.imageHeight);

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我这样写入材质之后要怎么才能渲染到窗口上

纱夜

冰冷冷发表于 2020-5-8 19:50
我这样写入材质之后要怎么才能渲染到窗口上

mojang应该有轮子吧
你可以翻一下MinecraftClient相关的field
然后从你的mod加载图片然后直接交给forge或者mojang渲染即可
~~没人无聊会拿lwjgl写吧~~

你只是绑定了纹理
没有画出来
而且我还不知道有没有删除纹理
这个是我的大概的流程

public Texture2D(float[] vertices, float[] texCoords, String imagePath) throws IOException {
Util.checkGlError();
this.count = vertices.length >> 1;
this.vertices = vertices;
this.texCoords = texCoords;
texture = glGenTextures();
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
IntBuffer width = BufferUtils.createIntBuffer(1);
IntBuffer height = BufferUtils.createIntBuffer(1);
IntBuffer channels = BufferUtils.createIntBuffer(1);
STBImage.stbi_set_flip_vertically_on_load(true);
ByteBuffer data = STBImage.stbi_load_from_memory(Util.ioResFromJar(imagePath, 1024 * 1024), width, height, channels, 0);
glTexImage2D(GL_TEXTURE_2D, 0, channels.get(0) == 4 ? GL_RGBA : GL_RGB,
width.get(0), height.get(0), 0, channels.get(0) == 4 ? GL_RGBA : GL_RGB, GL_UNSIGNED_BYTE, data);
if (data != null) {
STBImage.stbi_image_free(data);
}
glGenerateMipmap(GL_TEXTURE_2D);
vbo = glGenBuffers();
vsh = ShaderManager.getVertexShader("commonTexture.vsh");
fsh = ShaderManager.getFragmentShader("commonTexture.fsh");
glBindBuffer(GL_ARRAY_BUFFER, vbo);
program = glCreateProgram();
glAttachShader(program, vsh.shader);
glAttachShader(program, fsh.shader);
glLinkProgram(program);
FloatBuffer floatBuffer = BufferUtils.createFloatBuffer(vertices.length + texCoords.length);
floatBuffer.put(vertices).put(texCoords).flip();
glBufferData(GL_ARRAY_BUFFER, floatBuffer, GL_STATIC_DRAW);
pPos = glGetAttribLocation(program, "pos");
pCoord = glGetAttribLocation(program, "aTexCoord");
pAlpha = glGetUniformLocation(program, "alpha");
Util.checkGlError();
}

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上面这个是创建

下面的是渲染

glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBindTexture(GL_TEXTURE_2D, texture);
glVertexAttribPointer(pPos, 2, GL_FLOAT, false, 2 * 4, 0);
glEnableVertexAttribArray(pPos);
glVertexAttribPointer(pCoord, 2, GL_FLOAT, false, 2 * 4, vertices.length << 2);
glEnableVertexAttribArray(pCoord);
glUseProgram(program);
glUniform1f(pAlpha, alpha);
glDrawArrays(GL_**S, 0, count);
glBindBuffer(GL_ARRAY_BUFFER, 0);

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因为要支持奇怪的gl版本所以没有用inout（
vsh

attribute vec2 pos;
attribute vec2 aTexCoord;
varying vec2 TexCoord;
void main() {
gl_Position = vec4(pos, 0.0, 1.0);
TexCoord = aTexCoord;
}

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fsh

varying vec2 TexCoord;
uniform sampler2D ourTexture;
uniform float alpha;
void main() {
vec2 coord = vec2(TexCoord.x, TexCoord.y);
vec4 color = texture2D(ourTexture, coord);
color.a = alpha * color.a;
gl_FragColor = color;
}

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