New Sections api and windowing work

src/main/java/dev/hilligans/ourcraft/client/rendering/graphics/tasks/SplitWindowRenderTask.java

@@ -0,0 +1,71 @@
+package dev.hilligans.ourcraft.client.rendering.graphics.tasks;
+
+import dev.hilligans.ourcraft.GameInstance;
+import dev.hilligans.ourcraft.client.Client;
+import dev.hilligans.ourcraft.client.MatrixStack;
+import dev.hilligans.ourcraft.client.rendering.VertexMesh;
+import dev.hilligans.ourcraft.client.rendering.graphics.RenderTask;
+import dev.hilligans.ourcraft.client.rendering.graphics.RenderTaskSource;
+import dev.hilligans.ourcraft.client.rendering.graphics.RenderWindow;
+import dev.hilligans.ourcraft.client.rendering.graphics.ShaderSource;
+import dev.hilligans.ourcraft.client.rendering.graphics.api.GraphicsContext;
+import dev.hilligans.ourcraft.client.rendering.graphics.api.IDefaultEngineImpl;
+import dev.hilligans.ourcraft.client.rendering.graphics.api.IGraphicsEngine;
+import dev.hilligans.ourcraft.client.rendering.graphics.implementations.splitwindows.SplitWindow;
+import dev.hilligans.ourcraft.client.rendering.graphics.implementations.splitwindows.SubWindow;
+
+public class SplitWindowRenderTask extends RenderTaskSource {
+
+    public ShaderSource shaderSource;
+
+    public SplitWindowRenderTask() {
+        super("split_window_render_task", "ourcraft:split_window_renderer");
+    }
+
+    @Override
+    public RenderTask getDefaultTask() {
+        return new RenderTask() {
+            @Override
+            public void draw(RenderWindow window, GraphicsContext graphicsContext, IGraphicsEngine<?, ?, ?> engine, Client client, MatrixStack worldStack, MatrixStack screenStack, float delta) {
+                long fboOld = engine.getDefaultImpl().getBoundFBO(graphicsContext);
+                SplitWindow splitWindow = (SplitWindow) window;
+                for(SubWindow subWindow : splitWindow.windows) {
+                    long fbo = subWindow.getTexture();
+                    engine.getDefaultImpl().bindFrameBuffer(graphicsContext, fbo);
+                    engine.getDefaultImpl().clearFBO(graphicsContext, subWindow.clearColor);
+                    subWindow.renderPipeline(client, subWindow.camera.getMatrix(), subWindow.camera.getScreenStack(), graphicsContext);
+                }
+
+                engine.getDefaultImpl().bindFrameBuffer(graphicsContext, fboOld);
+
+                for(SubWindow subWindow : splitWindow.windows) {
+                    float x = subWindow.offsetX;
+                    float y = subWindow.offsetY;
+                    float minX = 0;
+                    float minY = 0;
+                    float maxX = 1;
+                    float maxY = 1;
+                    float width = subWindow.width;
+                    float height = subWindow.height;
+                    float[] vertices = new float[] {x,y,0,minX,minY,x,y + height,0,minX,maxY,x + width,y,0,maxX,minY,x + width,y + height,0,maxX,maxY};
+                    int[] indices = new int[] {0,1,2,2,1,3};
+
+                    VertexMesh mesh = new VertexMesh(shaderSource.vertexFormat);
+
+                    mesh.addData(indices, vertices);
+
+                    engine.getDefaultImpl().bindPipeline(graphicsContext, shaderSource.program);
+                    engine.getDefaultImpl().bindTexture(graphicsContext, subWindow.getTexture());
+                    engine.getDefaultImpl().drawAndDestroyMesh(graphicsContext, screenStack, mesh);
+                    subWindow.swapBuffers();
+                }
+            }
+        };
+    }
+
+    @Override
+    public void load(GameInstance gameInstance) {
+        super.load(gameInstance);
+        shaderSource = gameInstance.SHADERS.get("ourcraft:position_texture");
+    }
+}