main

FletchingTableMixin.java

package io.github.ishidex2.fletching_table.mixin;

import com.mojang.blaze3d.systems.RenderSystem;
import io.github.ishidex2.fletching_table.RenderStuff;
import net.minecraft.block.BlockState;
import net.minecraft.block.FletchingTableBlock;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.util.ActionResult;
import net.minecraft.util.Hand;
import net.minecraft.util.Identifier;
import net.minecraft.util.hit.BlockHitResult;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Overwrite;
@Mixin(FletchingTableBlock.class)

public class FletchingTableMixin {
	private Identifier fletchingTableGUI = new Identifier("fletching_table", "textures/gui/fletching_table.png");

//	@Inject(at = @At("INVOKE"), method = "onUse")
	@Overwrite
	public ActionResult onUse(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
		RenderSystem.color4f(1.0F, 1.0F, 1.0F, 1.0F);
		RenderStuff.texturedRect(0, 0, 100, 75, fletchingTableGUI, 0, 0, 1, 1, 0xFFFFFFFF);
		return ActionResult.SUCCESS;
	}

}

renderstuff.java

package io.github.ishidex2.fletching_table;

import com.mojang.blaze3d.platform.GlStateManager;
import com.mojang.blaze3d.systems.RenderSystem;
import net.minecraft.client.MinecraftClient;
import net.minecraft.client.render.BufferBuilder;
import net.minecraft.client.render.Tessellator;
import net.minecraft.client.render.VertexFormats;
import net.minecraft.util.Identifier;
import org.lwjgl.opengl.GL11;

public class RenderStuff {

    public static void texturedRect(int x, int y, int width, int height, Identifier texture, float u1, float v1, float u2, float v2, int color) {
        MinecraftClient.getInstance().getTextureManager().bindTexture(texture);

        //float scale = 0.00390625F;
        System.out.println("Hi");

        if (width <= 0) width = 1;
        if (height <= 0) height = 1;

        float r = (color >> 16 & 255) / 255.0F;
        float g = (color >> 8 & 255) / 255.0F;
        float b = (color & 255) / 255.0F;
        Tessellator tessellator = Tessellator.getInstance();
        BufferBuilder buffer = tessellator.getBuffer();
        RenderSystem.enableBlend();
        RenderSystem.blendFuncSeparate(GlStateManager.SrcFactor.SRC_ALPHA, GlStateManager.DstFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SrcFactor.ONE, GlStateManager.DstFactor.ZERO);
        RenderSystem.color4f(r, g, b, 1.0f);
        buffer.begin(GL11.GL_QUADS, VertexFormats.POSITION_TEXTURE);
        buffer.vertex(x,         y + height, 0).texture(u1, v2).next();
        buffer.vertex(x + width, y + height, 0).texture(u2, v2).next();
        buffer.vertex(x + width, y,          0).texture(u2, v1).next();
        buffer.vertex(x,         y,          0).texture(u1, v1).next();
        tessellator.draw();
        RenderSystem.disableBlend();
    }
}