gltfio: add ubershader template.
We will need 6 pre-compiled materials (lit vs nonlit and the 3 blend modes). This uses CMake's "configure_file" functionality to generate 6 mat files, then invokes matc on each one. They are then combined using resgen.
This commit is contained in:
Philip Rideout
@@ -303,7 +303,9 @@ endif()
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# ==================================================================================================
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# Sets the following variables: RESGEN_HEADER, RESGEN_SOURCE, RESGEN_FLAGS, RESGEN_SOURCE_FLAGS,
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# and RESGEN_OUTPUTS
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# and RESGEN_OUTPUTS. Please pass in an ARCHIVE_NAME that is unique to your project, otherwise the
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# incbin directive will happily consume a blob from the wrong project without warnings or errors.
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# Also be sure to include the ASM language in the CMake "project" directive for your project.
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function(get_resgen_vars ARCHIVE_DIR ARCHIVE_NAME)
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set(OUTPUTS
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${ARCHIVE_DIR}/${ARCHIVE_NAME}.bin
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@@ -1,5 +1,5 @@
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cmake_minimum_required(VERSION 3.1)
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project(gltfio)
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project(gltfio C ASM)
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set(TARGET gltfio)
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set(PUBLIC_HDR_DIR include)
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@@ -29,14 +29,85 @@ set(SRCS
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src/upcast.h
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)
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# ==================================================================================================
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# Build materials
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# ==================================================================================================
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set(RESOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR})
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if (CMAKE_CROSSCOMPILING)
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include(${IMPORT_EXECUTABLES})
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endif()
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if (ANDROID OR WEBGL OR IOS)
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set(MATC_TARGET mobile)
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else()
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set(MATC_TARGET desktop)
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endif()
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set(MATC_FLAGS -a all)
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if (NOT CMAKE_BUILD_TYPE MATCHES Release)
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set(MATC_FLAGS -g ${MATC_FLAGS})
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endif()
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function(generate_mat SHADINGMODEL BLENDING)
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set(GENERATED_MAT "${RESOURCE_DIR}/${SHADINGMODEL}_${BLENDING}.mat")
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configure_file(materials/ubershader.mat.in ${GENERATED_MAT})
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set(MATERIAL_SRCS ${MATERIAL_SRCS} ${GENERATED_MAT} PARENT_SCOPE)
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endfunction()
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set(MATERIAL_SRCS)
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generate_mat(lit transparent)
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generate_mat(lit opaque)
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generate_mat(lit masked)
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generate_mat(unlit transparent)
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generate_mat(unlit opaque)
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generate_mat(unlit masked)
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set(RESOURCE_BINS)
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foreach (input_path ${MATERIAL_SRCS})
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get_filename_component(basename "${input_path}" NAME_WE)
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set(output_path "${RESOURCE_DIR}/${basename}.filamat")
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add_custom_command(
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OUTPUT ${output_path}
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COMMAND matc ${MATC_FLAGS} -p ${MATC_TARGET} -m material
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-o ${output_path} ${input_path}
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MAIN_DEPENDENCY ${input_path}
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DEPENDS matc
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COMMENT "Compiling material ${mat_src} to ${output_path}"
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)
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list(APPEND RESOURCE_BINS ${output_path})
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endforeach()
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# ==================================================================================================
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# Build resources library
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# ==================================================================================================
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get_resgen_vars(${RESOURCE_DIR} gltfresources)
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add_custom_command(
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OUTPUT ${RESGEN_OUTPUTS}
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COMMAND resgen ${RESGEN_FLAGS} ${RESOURCE_BINS}
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DEPENDS resgen ${RESOURCE_BINS}
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)
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if (DEFINED RESGEN_SOURCE_FLAGS)
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set_source_files_properties(${RESGEN_SOURCE} PROPERTIES COMPILE_FLAGS ${RESGEN_SOURCE_FLAGS})
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endif()
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set(DUMMY_SRC "${RESOURCE_DIR}/dummy.c")
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add_custom_command(OUTPUT ${DUMMY_SRC} COMMAND echo "//" > ${DUMMY_SRC})
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add_library(gltfio_resources ${DUMMY_SRC} ${RESGEN_SOURCE})
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# ==================================================================================================
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# Include and target definitions
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# ==================================================================================================
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include_directories(${PUBLIC_HDR_DIR})
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include_directories(${PUBLIC_HDR_DIR} ${RESOURCE_DIR})
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add_library(${TARGET} STATIC ${PUBLIC_HDRS} ${SRCS})
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target_link_libraries(${TARGET} PUBLIC math utils filamat filament cgltf stb geometry)
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target_link_libraries(${TARGET} PUBLIC math utils filamat filament cgltf stb geometry gltfio_resources)
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target_include_directories(${TARGET} PUBLIC ${PUBLIC_HDR_DIR})
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96
libs/gltfio/materials/ubershader.mat.in
Normal file
96
libs/gltfio/materials/ubershader.mat.in
Normal file
@@ -0,0 +1,96 @@
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material {
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name : ubershader,
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requires : [ uv0, uv1, color ],
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shadingModel : ${SHADINGMODEL},
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blending : ${BLENDING},
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parameters : [
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// Base Color
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{ type : int, name : baseColorIndex },
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{ type : float4, name : baseColorFactor },
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{ type : sampler2d, name : baseColorMap },
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{ type : mat3, name : baseColorUvMatrix },
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// Metallic-Roughness Map
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{ type : int, name : metallicRoughnessIndex },
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{ type : float, name : metallicFactor },
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{ type : float, name : roughnessFactor },
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{ type : sampler2d, name : metallicRoughnessMap },
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{ type : mat3, name : metallicRoughnessUvMatrix },
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// Normal Map
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{ type : int, name : normalIndex },
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{ type : float, name : normalScale },
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{ type : sampler2d, name : normalMap },
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{ type : mat3, name : normalUvMatrix },
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// Ambient Occlusion
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{ type : int, name : aoIndex },
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{ type : float, name : aoStrength },
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{ type : sampler2d, name : occlusionMap },
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{ type : mat3, name : occlusionUvMatrix },
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// Emissive Map
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{ type : int, name : emissiveIndex },
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{ type : float3, name : emissiveFactor },
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{ type : sampler2d, name : emissiveMap },
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{ type : mat3, name : emissiveUvMatrix }
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],
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}
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fragment {
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void material(inout MaterialInputs material) {
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float2 uvs[2];// = { getUV0(), getUV1() };
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uvs[0] = getUV0();
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uvs[1] = getUV1();
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#if !defined(SHADING_MODEL_UNLIT)
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if (materialParams.normalIndex > -1) {
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float2 uv = uvs[materialParams.normalIndex];
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uv = (vec3(uv, 1.0) * materialParams.normalUvMatrix).xy;
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material.normal = texture(materialParams_normalMap, uv).xyz * 2.0 - 1.0;
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material.normal.y = -material.normal.y;
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material.normal.xy *= materialParams.normalScale;
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}
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#endif
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prepareMaterial(material);
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material.baseColor = materialParams.baseColorFactor;
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if (materialParams.baseColorIndex > -1) {
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float2 uv = uvs[materialParams.baseColorIndex];
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uv = (vec3(uv, 1.0) * materialParams.baseColorUvMatrix).xy;
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material.baseColor *= texture(materialParams_baseColorMap, uv);
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}
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#if defined(BLEND_MODE_TRANSPARENT)
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material.baseColor.rgb *= material.baseColor.a;
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#endif
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material.baseColor *= getColor();
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#if !defined(SHADING_MODEL_UNLIT)
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material.roughness = materialParams.roughnessFactor;
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material.metallic = materialParams.metallicFactor;
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material.emissive.rgb = materialParams.emissiveFactor.rgb;
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material.emissive.a = 3.0;
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if (materialParams.metallicRoughnessIndex > -1) {
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float2 uv = uvs[materialParams.metallicRoughnessIndex];
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uv = (vec3(uv, 1.0) * materialParams.metallicRoughnessUvMatrix).xy;
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vec4 roughness = texture(materialParams_metallicRoughnessMap, uv);
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material.roughness *= roughness.g;
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material.metallic *= roughness.b;
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}
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if (materialParams.aoIndex > -1) {
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float2 uv = uvs[materialParams.aoIndex];
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uv = (vec3(uv, 1.0) * materialParams.occlusionUvMatrix).xy;
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material.ambientOcclusion = texture(materialParams_occlusionMap, uv).r *
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materialParams.aoStrength;
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}
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if (materialParams.emissiveIndex > -1) {
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float2 uv = uvs[materialParams.emissiveIndex];
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uv = (vec3(uv, 1.0) * materialParams.emissiveUvMatrix).xy;
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material.emissive.rgb *= texture(materialParams_emissiveMap, uv).rgb;
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}
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#endif
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}
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}
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