# Makefile for GAL WebGL Test (WASM)
#
# Builds WEBGL_GAL (ported from OPENGL_GAL) using wxWidgets WASM build.
# Uses LEGACY_GL_EMULATION for legacy OpenGL compatibility.
#
# Usage:
#   make                    # Build
#   make clean              # Clean build artifacts
#   make DEBUG=1            # Debug build with source maps

CXX = em++

# Paths relative to this Makefile
PROJECT_ROOT = ../../..
KICAD_ROOT = $(PROJECT_ROOT)/kicad
WX_BUILD = $(PROJECT_ROOT)/build-wasm/wxwidgets-universal
TOOLS_ROOT = $(PROJECT_ROOT)/wxwidgets/build/wasm

# Output directory
OUTPUT_DIR = ../../apps/gal-webgl

# wx-config for wxWidgets WASM
WXCONFIG = $(WX_BUILD)/wx-config
WX_CXXFLAGS := $(shell $(WXCONFIG) --cxxflags)
WX_LDFLAGS := $(shell $(WXCONFIG) --libs base,core,gl)

# Sysroot (contains boost, etc.)
SYSROOT = $(PROJECT_ROOT)/build-wasm/sysroot

# KiCad include paths
# Note: -I../native provides stub files (config.h, kicad_stubs.h, etc.)
KICAD_INCLUDES = -I../native \
                 -Igenerated \
                 -I$(KICAD_ROOT)/include \
                 -I$(KICAD_ROOT)/include/gal \
                 -I$(KICAD_ROOT)/include/gal/opengl \
                 -I$(KICAD_ROOT)/common \
                 -I$(KICAD_ROOT)/libs/kimath/include \
                 -I$(KICAD_ROOT)/libs/kiplatform/include \
                 -I$(KICAD_ROOT)/libs/core/include \
                 -I$(KICAD_ROOT)/thirdparty/glm \
                 -I$(KICAD_ROOT)/thirdparty/nlohmann_json \
                 -I$(KICAD_ROOT)/thirdparty/thread-pool \
                 -I$(KICAD_ROOT)/thirdparty/clipper2/Clipper2Lib/include \
                 -I$(SYSROOT)/include \
                 -Iwebgl

# Debug or Release build
ifdef DEBUG
    OPT_FLAGS = -g -O0
    DEBUG_LDFLAGS = -g -gsource-map
else
    OPT_FLAGS = -O2
    DEBUG_LDFLAGS =
endif

CXXFLAGS = $(OPT_FLAGS) $(WX_CXXFLAGS) $(KICAD_INCLUDES) -std=c++20

# Emscripten flags
BASE_LDFLAGS = -sALLOW_MEMORY_GROWTH=1 \
               -sERROR_ON_UNDEFINED_SYMBOLS=0 \
               -sEXPORTED_FUNCTIONS=['_main','_runScenario','_getTotalScenarios','_getCurrentScenario','_getCanvasWidth','_getCanvasHeight'] \
               -sEXPORTED_RUNTIME_METHODS=['ccall','cwrap','HEAPU8'] \
               -sMODULARIZE=1 \
               -sEXPORT_NAME='createGALTest' \
               -sENVIRONMENT=web

# GL-specific flags - LEGACY_GL_EMULATION handles legacy GL calls
EM_GL_FLAGS = -sLEGACY_GL_EMULATION=1 -sMAX_WEBGL_VERSION=2
GL_SHIM = $(PROJECT_ROOT)/wasm/shims/gl_immediate_shim.js

LDFLAGS = $(DEBUG_LDFLAGS) $(BASE_LDFLAGS) $(EM_GL_FLAGS) --js-library=$(GL_SHIM) $(WX_LDFLAGS)

# Templates
JS = $(TOOLS_ROOT)/wx.js
HTML_TEMPLATE = $(TOOLS_ROOT)/template.html

# Source files
MAIN_SRCS = gal_webgl_test.cpp

# Generated shader sources (from generate_shaders.py)
SHADER_SRCS = generated/glsl_kicad_frag.cpp \
              generated/glsl_kicad_vert.cpp \
              generated/glsl_smaa_base.cpp \
              generated/glsl_smaa_pass_1_frag_color.cpp \
              generated/glsl_smaa_pass_1_frag_luma.cpp \
              generated/glsl_smaa_pass_1_vert.cpp \
              generated/glsl_smaa_pass_2_frag.cpp \
              generated/glsl_smaa_pass_2_vert.cpp \
              generated/glsl_smaa_pass_3_frag.cpp \
              generated/glsl_smaa_pass_3_vert.cpp

# WebGL GAL sources (ported from OpenGL GAL)
WEBGL_SRCS = webgl/webgl_gal.cpp \
             webgl/vertex_manager.cpp \
             webgl/vertex_container.cpp \
             webgl/vertex_item.cpp \
             webgl/gpu_manager.cpp \
             webgl/noncached_container.cpp \
             webgl/cached_container.cpp \
             webgl/cached_container_gpu.cpp \
             webgl/cached_container_ram.cpp \
             webgl/shader.cpp \
             webgl/webgl_compositor.cpp \
             webgl/utils.cpp \
             webgl/gl_context_mgr.cpp \
             webgl/gl_resources.cpp \
             webgl/webgl_antialiasing.cpp

SRCS = $(MAIN_SRCS) $(SHADER_SRCS) $(WEBGL_SRCS)
OBJS = $(SRCS:.cpp=.o)

# Target
TARGET = $(OUTPUT_DIR)/gal_webgl_test.js

all: $(OUTPUT_DIR) $(TARGET)

$(OUTPUT_DIR):
	mkdir -p $(OUTPUT_DIR)

%.o: %.cpp
	$(CXX) -c $(CXXFLAGS) $< -o $@

$(TARGET): $(OBJS)
	$(CXX) $(OBJS) $(LDFLAGS) --pre-js $(JS) -o $@
	cp gal_webgl_test.html $(OUTPUT_DIR)/

clean:
	rm -f $(OBJS)
	rm -f $(OUTPUT_DIR)/gal_webgl_test.js
	rm -f $(OUTPUT_DIR)/gal_webgl_test.wasm
	rm -f $(OUTPUT_DIR)/gal_webgl_test.html

.PHONY: all clean