armory3d.armortools/armorpaint/Sources/make_mesh_preview.ts

let make_mesh_preview_opacity_discard_decal: f32 = 0.05;

function make_mesh_preview_run(data: material_t, matcon: material_context_t): node_shader_context_t {
	let context_id: string = "mesh";
	let props: shader_context_t = {
		name: context_id,
		depth_write: true,
		compare_mode: "less",
		cull_mode: "clockwise",
		vertex_elements: [
			{
				name: "pos",
				data: "short4norm"
			},
			{
				name: "nor",
				data: "short2norm"
			},
			{
				name: "tex",
				data: "short2norm"
			}
		],
		color_attachments: ["RGBA64", "RGBA64", "RGBA64"],
		depth_attachment: "DEPTH32"
	};
	let con_mesh: node_shader_context_t = node_shader_context_create(data, props);

	let vert: node_shader_t = node_shader_context_make_vert(con_mesh);
	let frag: node_shader_t = node_shader_context_make_frag(con_mesh);
	frag.ins = vert.outs;
	let pos: string = "pos";

	///if arm_skin
	let skin: bool = mesh_data_get_vertex_array(context_raw.paint_object.data, "bone") != null;
	if (skin) {
		pos = "spos";
		node_shader_context_add_elem(con_mesh, "bone", "short4norm");
		node_shader_context_add_elem(con_mesh, "weight", "short4norm");
		node_shader_add_function(vert, str_get_skinning_dual_quat);
		node_shader_add_uniform(vert, "vec4 skinBones[128 * 2]", "_skin_bones");
		node_shader_add_uniform(vert, "float posUnpack", "_pos_unpack");
		node_shader_write_attrib(vert, "vec4 skinA;");
		node_shader_write_attrib(vert, "vec4 skinB;");
		node_shader_write_attrib(vert, "getSkinningDualQuat(ivec4(bone * 32767), weight, skinA, skinB);");
		node_shader_write_attrib(vert, "vec3 spos = pos.xyz;");
		node_shader_write_attrib(vert, "spos.xyz *= posUnpack;");
		node_shader_write_attrib(vert, "spos.xyz += 2.0 * cross(skinA.xyz, cross(skinA.xyz, spos.xyz) + skinA.w * spos.xyz);");
		node_shader_write_attrib(vert, "spos.xyz += 2.0 * (skinA.w * skinB.xyz - skinB.w * skinA.xyz + cross(skinA.xyz, skinB.xyz));");
		node_shader_write_attrib(vert, "spos.xyz /= posUnpack;");
	}
	///end

	node_shader_add_uniform(vert, "mat4 WVP", "_world_view_proj_matrix");
	node_shader_write_attrib(vert, "gl_Position = mul(vec4(" + pos + ".xyz, 1.0), WVP);");

	let brush_scale: string = (context_raw.brush_scale * context_raw.brush_nodes_scale) + "";
	node_shader_add_out(vert, "vec2 texCoord");
	node_shader_write_attrib(vert, "texCoord = tex * float(" + brush_scale + ");");

	let decal: bool = context_raw.decal_preview;
	parser_material_sample_keep_aspect = decal;
	parser_material_sample_uv_scale = brush_scale;
	parser_material_parse_height = make_material_height_used;
	parser_material_parse_height_as_channel = true;
	let sout: shader_out_t = parser_material_parse(ui_nodes_get_canvas_material(), con_mesh, vert, frag, matcon);
	parser_material_parse_height = false;
	parser_material_parse_height_as_channel = false;
	parser_material_sample_keep_aspect = false;
	let base: string = sout.out_basecol;
	let rough: string = sout.out_roughness;
	let met: string = sout.out_metallic;
	let occ: string = sout.out_occlusion;
	let opac: string = sout.out_opacity;
	let height: string = sout.out_height;
	let nortan: string = parser_material_out_normaltan;
	node_shader_write(frag, "vec3 basecol = pow(" + base + ", vec3(2.2, 2.2, 2.2));");
	node_shader_write(frag, "float roughness = " + rough + ";");
	node_shader_write(frag, "float metallic = " + met + ";");
	node_shader_write(frag, "float occlusion = " + occ + ";");
	node_shader_write(frag, "float opacity = " + opac + ";");
	node_shader_write(frag, "vec3 nortan = " + nortan + ";");
	node_shader_write(frag, "float height = " + height + ";");

	// parse_height_as_channel = false;
	// write(vert, "float vheight = " + height + ";");
	// add_out(vert, "float height");
	// write(vert, "height = vheight;");
	// let displaceStrength: f32 = 0.1;
	// if (heightUsed && displaceStrength > 0.0) {
	// 	write(vert, "vec3 pos2 = " + pos + ".xyz + vec3(nor.xy, pos.w) * vec3(" + height + ", " + height + ", " + height + ") * vec3(" + displaceStrength + ", " + displaceStrength + ", " + displaceStrength + ");");
	// 	write(vert, "gl_Position = mul(vec4(pos2.xyz, 1.0), WVP);");
	// }

	if (decal) {
		if (context_raw.tool == workspace_tool_t.TEXT) {
			node_shader_add_uniform(frag, "sampler2D textexttool", "_textexttool");
			node_shader_write(frag, "opacity *= textureLod(textexttool, texCoord / float(" + brush_scale + "), 0.0).r;");
		}
	}
	if (decal) {
		let opac: f32 = make_mesh_preview_opacity_discard_decal;
		node_shader_write(frag, "if (opacity < " + opac + ") discard;");
	}

	node_shader_add_out(frag, "vec4 fragColor[3]");
	frag.n = true;

	node_shader_add_function(frag, str_pack_float_int16);
	node_shader_add_function(frag, str_cotangent_frame);
	node_shader_add_function(frag, str_octahedron_wrap);

	if (make_material_height_used) {
		node_shader_write(frag, "if (height > 0.0) {");
		node_shader_write(frag, "float height_dx = dFdx(height * 2.0);");
		node_shader_write(frag, "float height_dy = dFdy(height * 2.0);");
		// write(frag, "float height_dx = height0 - height1;");
		// write(frag, "float height_dy = height2 - height3;");
		// Whiteout blend
		node_shader_write(frag, "vec3 n1 = nortan * vec3(2.0, 2.0, 2.0) - vec3(1.0, 1.0, 1.0);");
		node_shader_write(frag, "vec3 n2 = normalize(vec3(height_dx * 16.0, height_dy * 16.0, 1.0));");
		node_shader_write(frag, "nortan = normalize(vec3(n1.xy + n2.xy, n1.z * n2.z)) * vec3(0.5, 0.5, 0.5) + vec3(0.5, 0.5, 0.5);");
		node_shader_write(frag, "}");
	}

	// Apply normal channel
	if (decal) {
		// TODO
	}
	else {
		frag.vvec = true;
		///if (krom_direct3d11 || krom_direct3d12 || krom_metal || krom_vulkan)
		node_shader_write(frag, "mat3 TBN = cotangentFrame(n, vVec, texCoord);");
		///else
		node_shader_write(frag, "mat3 TBN = cotangentFrame(n, -vVec, texCoord);");
		///end
		node_shader_write(frag, "n = nortan * 2.0 - 1.0;");
		node_shader_write(frag, "n.y = -n.y;");
		node_shader_write(frag, "n = normalize(mul(n, TBN));");
	}

	node_shader_write(frag, "n /= (abs(n.x) + abs(n.y) + abs(n.z));");
	node_shader_write(frag, "n.xy = n.z >= 0.0 ? n.xy : octahedronWrap(n.xy);");
	// uint matid = 0;

	if (decal) {
		node_shader_write(frag, "fragColor[0] = vec4(n.x, n.y, roughness, packFloatInt16(metallic, uint(0)));"); // metallic/matid
		node_shader_write(frag, "fragColor[1] = vec4(basecol, occlusion);");
	}
	else {
		node_shader_write(frag, "fragColor[0] = vec4(n.x, n.y, mix(1.0, roughness, opacity), packFloatInt16(mix(1.0, metallic, opacity), uint(0)));"); // metallic/matid
		node_shader_write(frag, "fragColor[1] = vec4(mix(vec3(0.0, 0.0, 0.0), basecol, opacity), occlusion);");
	}
	node_shader_write(frag, "fragColor[2] = vec4(0.0, 0.0, 0.0, 0.0);"); // veloc

	parser_material_finalize(con_mesh);

	///if arm_skin
	if (skin) {
		node_shader_write(vert, "wnormal = normalize(mul(vec3(nor.xy, pos.w) + 2.0 * cross(skinA.xyz, cross(skinA.xyz, vec3(nor.xy, pos.w)) + skinA.w * vec3(nor.xy, pos.w)), N));");
	}
	///end

	con_mesh.data.shader_from_source = true;
	con_mesh.data.vertex_shader = node_shader_get(vert);
	con_mesh.data.fragment_shader = node_shader_get(frag);

	return con_mesh;
}