1.20.4 compatibility

remappedSrc/themixray/repeating/mod/render/shader/ShaderManager.java

@@ -0,0 +1,97 @@
+package themixray.repeating.mod.render.shader;
+
+import com.mojang.blaze3d.platform.GlStateManager;
+import com.mojang.blaze3d.platform.TextureUtil;
+import lombok.Getter;
+import lombok.SneakyThrows;
+import lombok.experimental.UtilityClass;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.gl.GlImportProcessor;
+import net.minecraft.resource.Resource;
+import net.minecraft.resource.ResourceFactory;
+import net.minecraft.util.Identifier;
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.jetbrains.annotations.Nullable;
+import org.lwjgl.system.MemoryUtil;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.Optional;
+
+import static org.lwjgl.opengl.GL33.*;
+
+@UtilityClass
+public class ShaderManager {
+    @Getter
+    private Shader positionColorShader;
+
+    public void init() {
+        ClientLifecycleEvents.CLIENT_STARTED.register(client -> loadShaders());
+    }
+
+    private void loadShaders() {
+        positionColorShader = new Shader("position_color");
+    }
+
+    public int loadShaderProgram(String name, ShaderType type) {
+        try {
+            boolean file_present = true;
+            ResourceFactory resourceFactory = MinecraftClient.getInstance().getResourceManager();
+            Optional<Resource> resource = resourceFactory.getResource(new Identifier("renderer", "shader/" + name + type.fileExtension));
+            int i = glCreateShader(type.glType);
+            if (resource.isPresent()) {
+                GlStateManager.glShaderSource(i, new GlImportProcessor() {
+                    @SneakyThrows
+                    @Nullable
+                    @Override
+                    public String loadImport(boolean inline, String name) {
+                        return IOUtils.toString(resource.get().getInputStream(), StandardCharsets.UTF_8);
+                    }
+                }.readSource(readResourceAsString(resource.get().getInputStream())));
+            } else file_present = false;
+            glCompileShader(i);
+            if (glGetShaderi(i, GL_COMPILE_STATUS) == 0 || !file_present) {
+                String shaderInfo = StringUtils.trim(glGetShaderInfoLog(i, 32768));
+                throw new IOException("Couldn't compile " + type.name + " program (" + name + ") : " + shaderInfo);
+            }
+            return i;
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return 0;
+    }
+
+    private String readResourceAsString(InputStream inputStream) {
+        ByteBuffer byteBuffer = null;
+        try {
+            byteBuffer = TextureUtil.readResource(inputStream);
+            int i = byteBuffer.position();
+            byteBuffer.rewind();
+            return MemoryUtil.memASCII(byteBuffer, i);
+        } catch (IOException ignored) {
+        } finally {
+            if (byteBuffer != null) {
+                MemoryUtil.memFree(byteBuffer);
+            }
+        }
+        return null;
+    }
+
+    public enum ShaderType {
+        VERTEX("vertex", ".vsh", GL_VERTEX_SHADER),
+        FRAGMENT("fragment", ".fsh", GL_FRAGMENT_SHADER);
+        private final String name;
+        private final String fileExtension;
+        private final int glType;
+
+        ShaderType(String name, String fileExtension, int glType) {
+            this.name = name;
+            this.fileExtension = fileExtension;
+            this.glType = glType;
+        }
+    }
+}