#!/bin/bash
set -eu

for arg in "$@"; do declare $arg="1"; done
if [ ! -v clang ]; 												then gcc=1; fi
if [ ! -v release ]; 											then debug=1; fi
if [ -v debug ]; 													then echo "[debug mode]"; fi
if [ -v release ];												then echo "[release mode]"; fi
if [ -v gcc ]; 														then compiler="${CC:-gcc}"; cpp_compiler="g++"; echo "[gcc compiler]"; fi
if [ -v clang ]; 													then compiler="${CC:-clang}"; cpp_compiler="clang++"; echo "[clang compiler]"; fi
if [ -v vulkan ]; 												then render_flag="-DSTG_VULKAN_RENDERER"; echo "[vulkan renderer]"; fi
if [ -v opengl ] && [ ! -v render_flag ];	then render_flag="-DSTG_OPENGL_RENDERER"; echo "[opengl renderer]"; fi
if [ -v webgl ] && [ ! -v render_flag ];	then render_flag="-DSTG_WEBGL_RENDERER"; echo "[webgl renderer]"; fi
if [ -v dx11 ] && [ ! -v render_flag ]; 	then render_flag="-DSTG_DX11_RENDERER"; echo "[dx11 renderer]"; fi
if [ ! -v render_flag ];									then render_flag="-DSTG_VULKAN_RENDERER"; vulkan="vulkan"; echo "[default renderer - vulkan]"; fi

# for command line build args
auto_compile_flags="${render_flag}"

# source files
source_files="../src/entry_linux.c"

# includes
include_flags="-I../src/ -I../external/ -L."

# executable name
out_name="Gears"

# vma flags
vma_source_files="../external/vma/vma.cpp"
vma_compile_flags="-std=c++20 -I../external/vma -c"
vma_out="-o"
vma_obj="vma.o"

# glslc
glsl_compile="glslc"
glsl_flags="--target-spv=spv1.6 -std=460"
glsl_stage_vert="-fshader-stage=vert"
glsl_stage_frag="-fshader-stage=frag"
glsl_stage_tesc="-fshader-stage=tesc"
glsl_stage_tese="-fshader-stage=tese"
glsl_stage_geom="-fshader-stage=geom"
glsl_stage_comp="-fshader-stage=comp"
glsl_out="-o./shaders/glsl/"


clang_common="${include_flags} -Xclang -flto-visibility-public-std -Wno-unknown-warning-option -fdiagnostics-absolute-paths -Wall -Wno-missing-braces -Wno-unused-function -Wno-writable-strings -Wno-unused-value -Wno-unused-variable -Wno-unused-local-typedef -Wno-deprecated-register -Wno-deprecated-declarations -Wno-unused-but-set-variable -Wno-single-bit-bitfield-constant-conversion -Wno-compare-distinct-pointer-types -Wno-initializer-overrides -Wno-incompatible-pointer-types-discards-qualifiers -Wno-for-loop-analysis"
clang_debug="$compiler -g -O0 -DBUILD_DEBUG=1 ${clang_common} ${auto_compile_flags}"
clang_release="$compiler -O2 ${clang_common} ${auto_compile_flags}"
clang_link="-lpthread -lm -lrt -ldl -l:libvma.a"
clang_out="-o"

gcc_common="${include_flags} -std=c99 -fuse-ld=mold -Wno-unknown-warning-option -Wall -Wno-missing-braces -Wno-unused-function -Wno-attributes -Wno-unused-value -Wno-unused-variable -Wno-unused-local-typedef -Wno-deprecated-declarations -Wno-unused-but-set-variable -Wno-compare-distinct-pointer-types -D_USE_MATH_DEFINES -Dstrdup=_strdup -Dgnu_printf=printf"
gcc_debug="$compiler -g -O0 -DBUILD_DEBUG=1 ${gcc_common} ${auto_compile_flags}"
gcc_release="$compiler -O2 ${gcc_common} ${auto_compile_flags}"
gcc_link="-lpthread -lm -lrt -ldl -l:libvma.a -lstdc++"
gcc_out="-o"

link_dll="-fPIC"
link_os_gfx="-lxcb -lX11 -lX11-xcb -lvulkan"

if [ -v gcc ]; 			then compile_debug="$gcc_debug"; fi
if [ -v gcc ]; 			then compile_release="$gcc_release"; fi
if [ -v gcc ];			then compile_link="$gcc_link"; fi
if [ -v gcc ]; 			then out="$gcc_out"; fi

if [ -v clang ]; 		then compile_debug="$clang_debug"; fi
if [ -v clang ]; 		then compile_release="$clang_release"; fi
if [ -v clang ]; 		then compile_link="$clang_link"; fi
if [ -v clang ]; 		then out="$clang_out"; fi

if [ -v debug ]; 		then compile="$compile_debug"; fi
if [ -v release ];	then compile="$compile_release"; fi

mkdir -p build

cd build

if [ -v vulkan ]; then
	mkdir -p ./shaders/glsl
	mkdir -p ../src/file_data
	
	for file in ../src/shaders/glsl/*.glsl; do
		base_name=$(basename -- "$file" .glsl)

		case "$base_name" in 
			*.vert) glsl_stage="${glsl_stage_vert}" ;;
			*.frag) glsl_stage="${glsl_stage_frag}" ;;
			*.tesc) glsl_stage="${glsl_stage_tesc}" ;;
			*.tese) glsl_stage="${glsl_stage_tese}" ;;
			*.geom) glsl_stage="${glsl_stage_geom}" ;;
			*.comp) glsl_stage="${glsl_stage_comp}" ;;
			*) continue ;;
		esac

		$glsl_compile $glsl_flags $glsl_stage $file "${glsl_out}${base_name}.spv"
	done

	rm -f ../src/file_data/spv.c
	touch ../src/file_data/spv.c

	for file in ./shaders/glsl/*.spv; do
		base_name=$(basename -- "$file" .spv)

		xxd -n "shader_${base_name}" -i $file >> ../src/file_data/spv.c
	done

fi

$cpp_compiler $vma_compile_flags $vma_source_files $vma_out $vma_obj

ar rcs libvma.a vma.o

$compile $source_files $compile_link $link_os_gfx $out $out_name