#version 120
#extension GL_ARB_explicit_attrib_location: enable
#extension GL_ARB_shader_image_load_store: enable

#include "/lib/settings.glsl"

#define RENDER_SHADOW


/*
!! DO NOT REMOVE !!
This code is from Chocapic13' shaders
Read the terms of modification and sharing before changing something below please !
!! DO NOT REMOVE !!
*/

#ifdef IS_LPV_ENABLED
	attribute vec4 mc_Entity;
	attribute vec3 at_midBlock;
	attribute vec3 vaPosition;
	
	uniform int renderStage;
	uniform vec3 chunkOffset;
	uniform vec3 cameraPosition;
    uniform int currentRenderedItemId;
	uniform int blockEntityId;
	uniform int entityId;

	#include "/lib/blocks.glsl"
	#include "/lib/entities.glsl"
	#include "/lib/voxel_common.glsl"
	#include "/lib/voxel_write.glsl"
#endif


void main() {
	#if defined IS_LPV_ENABLED && defined MC_GL_EXT_shader_image_load_store
		if (
			renderStage == MC_RENDER_STAGE_TERRAIN_SOLID || renderStage == MC_RENDER_STAGE_TERRAIN_TRANSLUCENT ||
			renderStage == MC_RENDER_STAGE_TERRAIN_CUTOUT || renderStage == MC_RENDER_STAGE_TERRAIN_CUTOUT_MIPPED
		) {
			vec3 playerpos = vaPosition + chunkOffset + gl_Vertex.xyz;
			vec3 originPos = playerpos + at_midBlock/64.0;

			uint voxelId = uint(mc_Entity.x + 0.5);
			if (voxelId == 0u) voxelId = 1u;

			SetVoxelBlock(originPos, voxelId);
		}
		
		// #ifdef LPV_ENTITY_LIGHTS
		// 	if (
		// 		(currentRenderedItemId > 0 || entityId > 0) &&
		// 		(renderStage == MC_RENDER_STAGE_BLOCK_ENTITIES || renderStage == MC_RENDER_STAGE_ENTITIES)
		// 	) {
		// 		uint voxelId = 0u;

		// 		if (currentRenderedItemId > 0) {
		// 			if (entityId == ENTITY_PLAYER) {
		// 				// TODO: remove once hand-light is added
		// 				if (currentRenderedItemId < 1000)
		// 					voxelId = uint(currentRenderedItemId);
		// 			}
		// 			else if (entityId != ENTITY_ITEM_FRAME)
		// 				voxelId = uint(currentRenderedItemId);
		// 		}
		// 		else {
		// 			switch (entityId) {
		// 				case ENTITY_SPECTRAL_ARROW:
		// 					voxelId = uint(BLOCK_TORCH);
		// 					break;

		// 				// TODO: blaze, magma_cube
		// 			}
		// 		}

		// 		if (voxelId > 0u)
		// 			SetVoxelBlock(playerpos, voxelId);
		// 	}
		// #endif
	#endif

	gl_Position = vec4(-1.0);
}