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/*
* Copyright (C) 2022 NotEnoughUpdates contributors
*
* This file is part of NotEnoughUpdates.
*
* NotEnoughUpdates is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* NotEnoughUpdates is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
*/
package io.github.moulberry.notenoughupdates.cosmetics;
import net.minecraft.client.Minecraft;
import net.minecraft.client.resources.IResourceManager;
import net.minecraft.client.resources.IResourceManagerReloadListener;
import net.minecraft.util.ResourceLocation;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL43;
import org.lwjgl.util.vector.Vector2f;
import org.lwjgl.util.vector.Vector3f;
import org.lwjgl.util.vector.Vector4f;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
public class ShaderManager implements IResourceManagerReloadListener {
private final ResourceLocation shaderLocation = new ResourceLocation("notenoughupdates:shaders");
private final HashMap<String, Shader> shaderMap = new HashMap<>();
private static final ShaderManager INSTANCE = new ShaderManager();
public static ShaderManager getInstance() {
return INSTANCE;
}
@Override
public void onResourceManagerReload(IResourceManager iResourceManager) {
shaderMap.values().forEach(it -> {
GL20.glDeleteProgram(it.program);
});
shaderMap.clear();
}
public static class Shader {
public final int program;
public Shader(int program) {
this.program = program;
}
}
public int getShader(String name) {
if (!shaderMap.containsKey(name)) {
reloadShader(name);
}
return shaderMap.get(name).program;
}
public int loadShader(String name) {
if (!shaderMap.containsKey(name)) {
reloadShader(name);
}
GL20.glUseProgram(shaderMap.get(name).program);
return shaderMap.get(name).program;
}
public void loadData(String name, String var, Object value) {
int location = GL20.glGetUniformLocation(shaderMap.get(name).program, var);
if (value instanceof Integer) {
GL20.glUniform1i(location, (Integer) value);
} else if (value instanceof Float) {
GL20.glUniform1f(location, (Float) value);
} else if (value instanceof Vector2f) {
Vector2f vec = (Vector2f) value;
GL20.glUniform2f(location, vec.x, vec.y);
} else if (value instanceof Vector3f) {
Vector3f vec = (Vector3f) value;
GL20.glUniform3f(location, vec.x, vec.y, vec.z);
} else if (value instanceof Vector4f) {
Vector4f vec = (Vector4f) value;
GL20.glUniform4f(location, vec.x, vec.y, vec.z, vec.w);
} else {
throw new UnsupportedOperationException("Failed to load data into shader: Unsupported data type.");
}
}
private void reloadShader(String name) {
int vertex = -1;
String sourceVert = getShaderSource(name, GL20.GL_VERTEX_SHADER);
if (!sourceVert.isEmpty()) {
vertex = GL20.glCreateShader(GL20.GL_VERTEX_SHADER);
GL20.glShaderSource(vertex, sourceVert);
GL20.glCompileShader(vertex);
if (GL20.glGetShaderi(vertex, 35713) == 0) {
System.err.println(GL20.glGetShaderInfoLog(vertex, 100));
}
}
int fragment = -1;
String sourceFrag = getShaderSource(name, GL20.GL_FRAGMENT_SHADER);
if (!sourceFrag.isEmpty()) {
fragment = GL20.glCreateShader(GL20.GL_FRAGMENT_SHADER);
GL20.glShaderSource(fragment, sourceFrag);
GL20.glCompileShader(fragment);
if (GL20.glGetShaderi(fragment, 35713) == 0) {
System.err.println(GL20.glGetShaderInfoLog(fragment, 100));
}
}
int compute = -1;
String sourceCompute = getShaderSource(name, GL43.GL_COMPUTE_SHADER);
if (!sourceCompute.isEmpty()) {
compute = GL20.glCreateShader(GL43.GL_COMPUTE_SHADER);
GL20.glShaderSource(compute, sourceCompute);
GL20.glCompileShader(compute);
if (GL20.glGetShaderi(compute, 35713) == 0) {
System.err.println(GL20.glGetShaderInfoLog(compute, 100));
}
}
int program = GL20.glCreateProgram();
if (vertex != -1) GL20.glAttachShader(program, vertex);
if (fragment != -1) GL20.glAttachShader(program, fragment);
if (compute != -1) GL20.glAttachShader(program, compute);
GL20.glLinkProgram(program);
if (vertex != -1) GL20.glDeleteShader(vertex);
if (fragment != -1) GL20.glDeleteShader(fragment);
if (compute != -1) GL20.glDeleteShader(compute);
if (GL20.glGetProgrami(program, 35714) == 0) {
System.err.println(GL20.glGetProgramInfoLog(program, 100));
}
GL20.glValidateProgram(program);
if (GL20.glGetProgrami(program, 35715) == 0) {
System.err.println(GL20.glGetProgramInfoLog(program, 100));
}
shaderMap.put(name, new Shader(program));
}
public String getShaderSource(String name, int type) {
String ext = "";
if (type == GL20.GL_VERTEX_SHADER) {
ext = ".vert";
} else if (type == GL20.GL_FRAGMENT_SHADER) {
ext = ".frag";
} else if (type == GL43.GL_COMPUTE_SHADER) {
ext = ".compute";
} else {
return "";
}
ResourceLocation location = new ResourceLocation(
shaderLocation.getResourceDomain(),
shaderLocation.getResourcePath() + "/" + name + ext
);
try (InputStream is = Minecraft.getMinecraft().getResourceManager().getResource(location).getInputStream()) {
StringBuilder source = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = br.readLine()) != null) {
source.append(line).append("\n");
}
return source.toString();
} catch (IOException ignored) {
}
return "";
}
}
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