#
# Copyright 2011-2013 Branimir Karadzic. All rights reserved.
# License: http://www.opensource.org/licenses/BSD-2-Clause
#

ifndef VERBOSE
SILENT = @
endif

ifndef TARGET
.PHONY: all
all:
	@echo Usage: make TARGET=# [clean, all, rebuild]
	@echo "  TARGET=0 (hlsl - dx9)"
	@echo "  TARGET=1 (hlsl - dx11)"
	@echo "  TARGET=2 (glsl - nacl)"
	@echo "  TARGET=3 (glsl - android)"
	@echo "  TARGET=4 (glsl - linux)"
	@echo "  VERBOSE=1 show build commands."
else

THISDIR := $(dir $(lastword $(MAKEFILE_LIST)))

UNAME := $(shell uname)
ifeq ($(UNAME),$(filter $(UNAME),Linux Darwin))
CMD_MKDIR=mkdir -p "$(1)"
CMD_RMDIR=rm -r "$(1)"
ifeq ($(UNAME),$(filter $(UNAME),Darwin))
OS=darwin
else
OS=linux
endif
else
CMD_MKDIR=cmd /C "if not exist "$(subst /,\,$(1))" mkdir "$(subst /,\,$(1))""
CMD_RMDIR=cmd /C "if exist "$(subst /,\,$(1))" rmdir /S /Q "$(subst /,\,$(1))""
OS=windows
endif

SHADERC="$(THISDIR)../tools/bin/$(OS)/shaderc"

ifeq ($(TARGET), 0)
VS_FLAGS=--platform windows -p vs_3_0 -O 3
FS_FLAGS=--platform windows -p ps_3_0 -O 3
SHADER_PATH=shaders/dx9
else
ifeq ($(TARGET), 1)
VS_FLAGS=--platform windows -p vs_4_0 -O 3
FS_FLAGS=--platform windows -p ps_4_0 -O 3
SHADER_PATH=shaders/dx11
else
ifeq ($(TARGET), 2)
VS_FLAGS=--platform nacl
FS_FLAGS=--platform nacl
SHADER_PATH=shaders/gles
else
ifeq ($(TARGET), 3)
VS_FLAGS=--platform android
FS_FLAGS=--platform android
SHADER_PATH=shaders/gles
else
ifeq ($(TARGET), 4)
VS_FLAGS=--platform linux -p 120
FS_FLAGS=--platform linux -p 120
SHADER_PATH=shaders/glsl
endif
endif
endif
endif
endif

THISDIR := $(dir $(lastword $(MAKEFILE_LIST)))
VS_FLAGS+=-i $(THISDIR)../src/
FS_FLAGS+=-i $(THISDIR)../src/

BUILD_OUTPUT_DIR=$(addprefix ./, $(RUNTIME_DIR)/$(SHADER_PATH))
BUILD_INTERMEDIATE_DIR=$(addprefix $(BUILD_DIR)/, $(SHADER_PATH))

VS_SOURCES=$(wildcard vs_*.sc)
VS_DEPS=$(addprefix $(BUILD_INTERMEDIATE_DIR)/,$(addsuffix .bin.d, $(basename $(VS_SOURCES))))

FS_SOURCES=$(wildcard fs_*.sc)
FS_DEPS=$(addprefix $(BUILD_INTERMEDIATE_DIR)/,$(addsuffix .bin.d, $(basename $(FS_SOURCES))))

VS_BIN = $(addprefix $(BUILD_INTERMEDIATE_DIR)/, $(addsuffix .bin, $(basename $(VS_SOURCES))))
FS_BIN = $(addprefix $(BUILD_INTERMEDIATE_DIR)/, $(addsuffix .bin, $(basename $(FS_SOURCES))))

BIN = $(VS_BIN) $(FS_BIN)
ASM = $(VS_ASM) $(FS_ASM)

$(BUILD_INTERMEDIATE_DIR)/vs_%.bin : vs_%.sc
	@echo [$(<)]
	$(SILENT) $(SHADERC) $(VS_FLAGS) --type vertex --depends -o $(@) -f $(<) --disasm
	$(SILENT) cp $(@) $(BUILD_OUTPUT_DIR)/$(@F)

$(BUILD_INTERMEDIATE_DIR)/fs_%.bin : fs_%.sc
	@echo [$(<)]
	$(SILENT) $(SHADERC) $(FS_FLAGS) --type fragment --depends -o $(@) -f $(<) --disasm
	$(SILENT) cp $(@) $(BUILD_OUTPUT_DIR)/$(@F)

.PHONY: all
all: dirs $(BIN)
	@echo Target $(SHADER_PATH)

.PHONY: clean
clean:
	@echo Cleaning...
	@-rm -vf $(BIN)
	@-$(call CMD_RMDIR,$(BUILD_INTERMEDIATE_DIR))

.PHONY: dirs
dirs:
	@-$(call CMD_MKDIR,$(BUILD_INTERMEDIATE_DIR))
	@-$(call CMD_MKDIR,$(BUILD_OUTPUT_DIR))

.PHONY: rebuild
rebuild: clean all

endif # TARGET

-include $(VS_DEPS)
-include $(FS_DEPS)