Rework rendering

Adds default, stereoscopic, tiling, cubic and equirectangular frame rendering

src/main/java/eu/crushedpixel/replaymod/video/entity/TilingEntityRenderer.java

@@ -0,0 +1,41 @@
+package eu.crushedpixel.replaymod.video.entity;
+
+import eu.crushedpixel.replaymod.video.frame.TilingFrameRenderer;
+
+import static net.minecraft.client.renderer.GlStateManager.scale;
+import static net.minecraft.client.renderer.GlStateManager.translate;
+import static org.lwjgl.opengl.GL11.glFrustum;
+
+public class TilingEntityRenderer extends CustomEntityRenderer {
+    private final TilingFrameRenderer renderer;
+    private int tileX, tileY;
+
+    public TilingEntityRenderer(TilingFrameRenderer renderer) {
+        this.renderer = renderer;
+    }
+
+    public void setTile(int tileX, int tileY) {
+        this.tileX = tileX;
+        this.tileY = tileY;
+    }
+
+    @Override
+    public void gluPerspective(float fovY, float aspect, float zNear, float zFar) {
+        double height = Math.tan(fovY / 360 * Math.PI) * zNear;
+        double width = height * aspect;
+
+        int videoWidth = renderer.getVideoWidth();
+        int videoHeight = renderer.getVideoHeight();
+        int tileWidth = renderer.getTileWidth();
+        int tileHeight = renderer.getTileHeight();
+        double tilesX = (double) videoWidth / tileWidth;
+        double tilesY = (double) videoHeight / tileHeight;
+        double tilesMin = Math.min(tilesX, tilesY);
+        scale(tilesMin, tilesMin, 1);
+        double xOffset = (2 * tileX - tilesX + 1) / tilesMin;
+        double yOffset = (2 * tileY - tilesY + 1) / tilesMin;
+        translate(-xOffset, yOffset, 0);
+
+        glFrustum(-width, width, -height, height, zNear, zFar);
+    }
+}