# AMD GPU retained display glue path for Redox OS
# Scope: bounded Red Bear display glue path for init, connector detection, and modeset.
# Imported Linux AMD DC / TTM / amdgpu core trees remain adjacent source under compile triage and
# are not part of the default retained build path. Full acceleration still requires broader GPU work
# plus Mesa radeonsi backend enablement.

[source]
# Local overlay recipe. The extracted Linux 7.0-rc7 AMDGPU tree lives next to this
# recipe at ../amdgpu-source and is referenced by the custom build script below.
path = "source"

[build]
template = "custom"
dependencies = [
    "redox-driver-sys",
    "linux-kpi",
    "firmware-loader",
]
script = """
DYNAMIC_INIT

# Paths
AMD_ROOT="${COOKBOOK_SOURCE}/../../amdgpu-source/gpu/drm/amd"
AMD_SRC="${AMD_ROOT}"
INCLUDES="${COOKBOOK_SOURCE}/../../amdgpu-source/include"
LINUX_KPI="${COOKBOOK_ROOT}/local/recipes/drivers/linux-kpi/source/src/c_headers"
REDOX_GLUE="${COOKBOOK_SOURCE}"
TARGET_CC="${TARGET}-gcc"

# Compiler flags for the bounded retained AMD path. Legacy AMD DC config defines remain here only
# for header compatibility with the adjacent imported Linux source trees.
export CFLAGS="-D__redox__ -D__KERNEL__ -DCONFIG_DRM_AMDGPU -DCONFIG_DRM_AMD_DC \
    -DCONFIG_DRM_AMD_DC_DML2=1 \
    -DCONFIG_DRM_AMD_DC_FP -DCONFIG_DRM_AMD_ACP \
    -I${LINUX_KPI} \
    -I${REDOX_GLUE} \
    -I${INCLUDES} \
    -I${INCLUDES}/drm \
    -I${AMD_SRC}/include \
    -I${AMD_SRC}/include/asic_reg \
    -I${AMD_SRC}/display \
    -I${AMD_SRC}/display/dc \
    -I${AMD_SRC}/display/dc/dml \
    -I${AMD_SRC}/display/dc/dml2_0 \
    -I${AMD_SRC}/display/dc/dml2_0/dml21 \
    -I${AMD_SRC}/display/dc/dcn20 \
    -I${AMD_SRC}/display/dc/dcn21 \
    -I${AMD_SRC}/display/dc/dcn30 \
    -I${AMD_SRC}/display/dc/dcn301 \
    -I${AMD_SRC}/display/dc/dcn31 \
    -I${AMD_SRC}/display/dc/dcn32 \
    -I${AMD_SRC}/display/dc/dcn35 \
    -I${AMD_SRC}/display/dmub \
    -I${AMD_SRC}/display/modules \
    -I${AMD_SRC}/display/modules/freesync \
    -I${AMD_SRC}/display/modules/color \
    -I${AMD_SRC}/display/modules/info_packet \
    -I${AMD_SRC}/display/modules/power \
    -I${AMD_SRC}/pm/swsmu \
    -I${AMD_SRC}/pm/swsmu/inc \
    -I${AMD_SRC}/pm/powerplay \
    -I${AMD_SRC}/pm/powerplay/inc \
    -I${AMD_SRC}/pm/powerplay/hwmgr \
    -fPIC -O2 -Wall -Wno-unused-function -Wno-unused-variable \
    -Wno-address-of-packed-member -Wno-initializer-overrides"

# Stage 1: Compile Redox glue code
"${TARGET_CC}" -c ${CFLAGS} "${REDOX_GLUE}/amdgpu_redox_main.c" -o amdgpu_redox_main.o
"${TARGET_CC}" -c ${CFLAGS} "${REDOX_GLUE}/redox_stubs.c" -o redox_stubs.o

# Stage 2: Bounded first-display path
#
# The current Red Bear AMD display bring-up path does not call into the imported
# Linux AMD Display Core tree directly. The live FFI surface comes from the
# Red Bear glue layer (`amdgpu_redox_main.c` / `redox_stubs.c`), while the
# broad `display/*.c` compile currently drags in optional and unsupported
# subtrees such as freesync before the retained path is even proven.
#
# Keep Stage 2 explicit and intentionally empty until a retained imported
# display-source subset is proven necessary by bounded compile triage.
DISPLAY_SRCS=""
success=0
failed=0
for src in $DISPLAY_SRCS; do
    obj=$(basename "${src%.c}.o")
    if "${TARGET_CC}" -c ${CFLAGS} "$src" -o "$obj" 2>"${obj}.log"; then
        success=$((success + 1))
    else
        failed=$((failed + 1))
        echo "ERROR: failed to compile $(basename $src)"
        cat "${obj}.log"
        exit 1
    fi
done
echo "Stage 2: bounded AMD display path compiled ${success} imported display files, ${failed} failed"

# Stage 3: Imported TTM path
#
# The current bounded Red Bear display path uses Rust-side GEM/GTT/ring handling in
# `redox-drm`, not the imported Linux TTM stack. Keep this explicit and empty until
# the bounded path proves a concrete need for imported TTM code.
TTM_SRCS=""
success=0
failed=0
for src in $TTM_SRCS; do
    obj=$(basename "${src%.c}.o")
    if "${TARGET_CC}" -c ${CFLAGS} "$src" -o "$obj" 2>"${obj}.log"; then
        success=$((success + 1))
    else
        failed=$((failed + 1))
        echo "ERROR: failed to compile $(basename $src)"
        cat "${obj}.log"
        exit 1
    fi
done
echo "Stage 3: bounded imported TTM path compiled ${success} files, ${failed} failed"

# Stage 4: Imported amdgpu core path
#
# The current bounded Red Bear display path uses the custom glue layer for init,
# connector enumeration, and modeset, while Rust-side code owns GEM/GTT/ring state.
# Keep imported amdgpu core sources out of the retained compile surface until the
# bounded path proves a specific dependency on them.
CORE_SRCS=""

success=0
failed=0
for src_name in $CORE_SRCS; do
    src="${AMD_SRC}/amdgpu/${src_name}"
    if [ -f "$src" ]; then
        obj="${src_name%.c}.o"
        if "${TARGET_CC}" -c ${CFLAGS} "$src" -o "$obj" 2>"${obj}.log"; then
            success=$((success + 1))
        else
            failed=$((failed + 1))
            echo "ERROR: failed to compile $src_name"
            cat "${obj}.log"
            exit 1
        fi
    fi
done
echo "Stage 4: amdgpu core compiled ${success} files, ${failed} failed"

# Stage 5: Link into shared library
OBJS=""
for obj in $(find . -name '*.o' -size +0c); do
    OBJS="$OBJS $obj"
done
if [ -z "$OBJS" ]; then
    echo "ERROR: no object files compiled successfully"
    exit 1
fi
"${TARGET_CC}" -shared -o libamdgpu_dc_redox.so $OBJS -lm -lpthread

# Install
mkdir -p "${COOKBOOK_STAGE}/usr/lib/redox/drivers"
cp libamdgpu_dc_redox.so "${COOKBOOK_STAGE}/usr/lib/redox/drivers/"
mkdir -p "${COOKBOOK_STAGE}/usr/include/amdgpu-redox"
cp "${REDOX_GLUE}/redox_glue.h" "${COOKBOOK_STAGE}/usr/include/amdgpu-redox/"
"""