package com.mojang.blaze3d.opengl;

import com.mojang.blaze3d.systems.CommandEncoderBackend;
import com.mojang.blaze3d.systems.GpuSurface;
import com.mojang.blaze3d.systems.GpuSurfaceBackend;
import com.mojang.blaze3d.systems.SurfaceException;
import com.mojang.blaze3d.textures.GpuTextureView;
import java.util.Collection;
import java.util.EnumSet;
import java.util.Set;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import org.lwjgl.glfw.GLFW;

@Environment(EnvType.CLIENT)
public class GlSurface implements GpuSurfaceBackend {
	private static final Set<GpuSurface.PresentMode> SUPPORTED_PRESENT_MODES = EnumSet.of(GpuSurface.PresentMode.FIFO, GpuSurface.PresentMode.IMMEDIATE);
	private final long windowHandle;

	public GlSurface(final long windowHandle) {
		this.windowHandle = windowHandle;
	}

	@Override
	public void configure(final GpuSurface.Configuration config) throws SurfaceException {
		GLFW.glfwSwapInterval(config.presentMode() == GpuSurface.PresentMode.FIFO ? 1 : 0);
	}

	@Override
	public boolean isSuboptimal() {
		return false;
	}

	@Override
	public void acquireNextTexture() {
	}

	@Override
	public void blitFromTexture(final CommandEncoderBackend commandEncoder, final GpuTextureView textureView) {
		((GlCommandEncoder)commandEncoder).presentTexture(textureView);
	}

	@Override
	public void present() {
		GLFW.glfwSwapBuffers(this.windowHandle);
	}

	@Override
	public void close() {
	}

	@Override
	public Collection<GpuSurface.PresentMode> supportedPresentModes() {
		return SUPPORTED_PRESENT_MODES;
	}
}