Hi,
I got an access violation when I do the following : shaderParams->params.matte.Cd= RGBAtoSpectrum(shaderParams->params.matte.Cd.s0123); If I do the following I have no crash : float16 _tempSpectrum_ = 0; _tempSpectrum_ = shaderParams->params.matte.Cd; shaderParams->params.matte.Cd= RGBAtoSpectrum(_tempSpectrum_.s0123); Where : ShaderParameters* shaderParams : It is a local variable It has the following definition : struct __attribute__((packed)) ShaderParam_ashikhmin { float Kd __attribute__((packed)); float16 Cd __attribute__((packed)); float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float exponent_u __attribute__((packed)); float exponent_v __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_ashikhmin_velvet { float Kd __attribute__((packed)); float16 Cd __attribute__((packed)); float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float rough __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_debug { float Kd __attribute__((packed)); float16 Cs __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_emitter { float power __attribute__((packed)); float16 Cs __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_emitter_blackbody { float power __attribute__((packed)); float temperature __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_emitter_textured { int filename __attribute__((packed)); float power __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_glass { float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float eta __attribute__((packed)); int caustics __attribute__((packed)); int TIR __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_glass_rough { float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float roughness __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_glass_textured { int filename __attribute__((packed)); float Ks __attribute__((packed)); float eta __attribute__((packed)); int caustics __attribute__((packed)); int TIR __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_glossy { float Kd __attribute__((packed)); float16 Cd __attribute__((packed)); float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_glossy_textured { int diffuseFilename __attribute__((packed)); float Kd __attribute__((packed)); int bumpMapFilename __attribute__((packed)); float Kb __attribute__((packed)); int normalMapFilename __attribute__((packed)); float scaleU __attribute__((packed)); float scaleV __attribute__((packed)); int flipU __attribute__((packed)); int flipV __attribute__((packed)); float Ks __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_matte { float Kd __attribute__((packed)); float16 Cd __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_matte_textured { int diffuseFilename __attribute__((packed)); float Kd __attribute__((packed)); int bumpMapFilename __attribute__((packed)); float Kb __attribute__((packed)); int normalMapFilename __attribute__((packed)); float scaleU __attribute__((packed)); float scaleV __attribute__((packed)); int flipU __attribute__((packed)); int flipV __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_metal_rough { float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float roughness __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_mirror { float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_mirror_textured { int filename __attribute__((packed)); float16 Cs __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_oren_nayar { float Kd __attribute__((packed)); float16 Cd __attribute__((packed)); float roughness __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_phong { float Kd __attribute__((packed)); float16 Cd __attribute__((packed)); float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float exponent __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_phong_textured { int diffuseFilename __attribute__((packed)); float Kd __attribute__((packed)); int bumpMapFilename __attribute__((packed)); float Kb __attribute__((packed)); int normalMapFilename __attribute__((packed)); float scaleU __attribute__((packed)); float scaleV __attribute__((packed)); int flipU __attribute__((packed)); int flipV __attribute__((packed)); float Ks __attribute__((packed)); float exponent __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_transmissive { float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float eta __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_mapping_normal { }; struct __attribute__((packed)) ShaderParam_mapping_tangent { }; struct __attribute__((packed)) ShaderParam_ward { float Kd __attribute__((packed)); float16 Cd __attribute__((packed)); float Ks __attribute__((packed)); float16 Cs __attribute__((packed)); float xrough __attribute__((packed)); float yrough __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_soap_bubble { }; struct __attribute__((packed)) ShaderParam_tc_builtinfunctions { float Kd __attribute__((packed)); float16 Cs __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_tc_closure_mix { float Kd1 __attribute__((packed)); float16 Cd1 __attribute__((packed)); float Kd2 __attribute__((packed)); float16 Cd2 __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_tc_normal_modify { float Kd __attribute__((packed)); float16 Cd __attribute__((packed)); float sx __attribute__((packed)); float sy __attribute__((packed)); float sz __attribute__((packed)); }; struct __attribute__((packed)) ShaderParam_tc_texture { int diffuseFilename __attribute__((packed)); float Kd __attribute__((packed)); int bumpMapFilename __attribute__((packed)); float Kb __attribute__((packed)); int normalMapFilename __attribute__((packed)); float scaleU __attribute__((packed)); float scaleV __attribute__((packed)); int flipU __attribute__((packed)); int flipV __attribute__((packed)); }; struct __attribute__((packed)) ShaderParametersStruct { uint shaderId __attribute__((packed)); union __attribute__((packed)) { struct ShaderParam_ashikhmin ashikhmin; struct ShaderParam_ashikhmin_velvet ashikhmin_velvet; struct ShaderParam_debug debug; struct ShaderParam_emitter emitter; struct ShaderParam_emitter_blackbody emitter_blackbody; struct ShaderParam_emitter_textured emitter_textured; struct ShaderParam_glass glass; struct ShaderParam_glass_rough glass_rough; struct ShaderParam_glass_textured glass_textured; struct ShaderParam_glossy glossy; struct ShaderParam_glossy_textured glossy_textured; struct ShaderParam_matte matte; struct ShaderParam_matte_textured matte_textured; struct ShaderParam_metal_rough metal_rough; struct ShaderParam_mirror mirror; struct ShaderParam_mirror_textured mirror_textured; struct ShaderParam_oren_nayar oren_nayar; struct ShaderParam_phong phong; struct ShaderParam_phong_textured phong_textured; struct ShaderParam_transmissive transmissive; struct ShaderParam_mapping_normal mapping_normal; struct ShaderParam_mapping_tangent mapping_tangent; struct ShaderParam_ward ward; struct ShaderParam_soap_bubble soap_bubble; struct ShaderParam_tc_builtinfunctions tc_builtinfunctions; struct ShaderParam_tc_closure_mix tc_closure_mix; struct ShaderParam_tc_normal_modify tc_normal_modify; struct ShaderParam_tc_texture tc_texture; } params __attribute__((packed)); }; #define ShaderParameters struct ShaderParametersStructstruct __attribute__((packed)) ShaderParam_ashikhmin{float Kd __attribute__((packed));float16 Cd __attribute__((packed));float Ks __attribute__((packed));float16 Cs __attribute__((packed));float exponent_u __attribute__((packed));float exponent_v __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_ashikhmin_velvet{float Kd __attribute__((packed));float16 Cd __attribute__((packed));float Ks __attribute__((packed));float16 Cs __attribute__((packed));float rough __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_debug{float Kd __attribute__((packed));float16 Cs __attribute__((packed));};struct __attribute__((packed)) ShaderParam_emitter{float power __attribute__((packed));float16 Cs __attribute__((packed));};struct __attribute__((packed)) ShaderParam_emitter_blackbody{float power __attribute__((packed));float temperature __attribute__((packed));};struct __attribute__((packed)) ShaderParam_emitter_textured{int filename __attribute__((packed));float power __attribute__((packed));};struct __attribute__((packed)) ShaderParam_glass{float Ks __attribute__((packed));float16 Cs __attribute__((packed));float eta __attribute__((packed));int caustics __attribute__((packed));int TIR __attribute__((packed));};struct __attribute__((packed)) ShaderParam_glass_rough{float Ks __attribute__((packed));float16 Cs __attribute__((packed));float roughness __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_glass_textured{int filename __attribute__((packed));float Ks __attribute__((packed));float eta __attribute__((packed));int caustics __attribute__((packed));int TIR __attribute__((packed));};struct __attribute__((packed)) ShaderParam_glossy{float Kd __attribute__((packed));float16 Cd __attribute__((packed));float Ks __attribute__((packed));float16 Cs __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_glossy_textured{int diffuseFilename __attribute__((packed));float Kd __attribute__((packed));int bumpMapFilename __attribute__((packed));float Kb __attribute__((packed));int normalMapFilename __attribute__((packed));float scaleU __attribute__((packed));float scaleV __attribute__((packed));int flipU __attribute__((packed));int flipV __attribute__((packed));float Ks __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_matte{float Kd __attribute__((packed));float16 Cd __attribute__((packed));};struct __attribute__((packed)) ShaderParam_matte_textured{int diffuseFilename __attribute__((packed));float Kd __attribute__((packed));int bumpMapFilename __attribute__((packed));float Kb __attribute__((packed));int normalMapFilename __attribute__((packed));float scaleU __attribute__((packed));float scaleV __attribute__((packed));int flipU __attribute__((packed));int flipV __attribute__((packed));};struct __attribute__((packed)) ShaderParam_metal_rough{float Ks __attribute__((packed));float16 Cs __attribute__((packed));float roughness __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_mirror{float Ks __attribute__((packed));float16 Cs __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_mirror_textured{int filename __attribute__((packed));float16 Cs __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_oren_nayar{float Kd __attribute__((packed));float16 Cd __attribute__((packed));float roughness __attribute__((packed));};struct __attribute__((packed)) ShaderParam_phong{float Kd __attribute__((packed));float16 Cd __attribute__((packed));float Ks __attribute__((packed));float16 Cs __attribute__((packed));float exponent __attribute__((packed));};struct __attribute__((packed)) ShaderParam_phong_textured{int diffuseFilename __attribute__((packed));float Kd __attribute__((packed));int bumpMapFilename __attribute__((packed));float Kb __attribute__((packed));int normalMapFilename __attribute__((packed));float scaleU __attribute__((packed));float scaleV __attribute__((packed));int flipU __attribute__((packed));int flipV __attribute__((packed));float Ks __attribute__((packed));float exponent __attribute__((packed));};struct __attribute__((packed)) ShaderParam_transmissive{float Ks __attribute__((packed));float16 Cs __attribute__((packed));float eta __attribute__((packed));};struct __attribute__((packed)) ShaderParam_mapping_normal{};struct __attribute__((packed)) ShaderParam_mapping_tangent{};struct __attribute__((packed)) ShaderParam_ward{float Kd __attribute__((packed));float16 Cd __attribute__((packed));float Ks __attribute__((packed));float16 Cs __attribute__((packed));float xrough __attribute__((packed));float yrough __attribute__((packed));};struct __attribute__((packed)) ShaderParam_soap_bubble{};struct __attribute__((packed)) ShaderParam_tc_builtinfunctions{float Kd __attribute__((packed));float16 Cs __attribute__((packed));};struct __attribute__((packed)) ShaderParam_tc_closure_mix{float Kd1 __attribute__((packed));float16 Cd1 __attribute__((packed));float Kd2 __attribute__((packed));float16 Cd2 __attribute__((packed));};struct __attribute__((packed)) ShaderParam_tc_normal_modify{float Kd __attribute__((packed));float16 Cd __attribute__((packed));float sx __attribute__((packed));float sy __attribute__((packed));float sz __attribute__((packed));};struct __attribute__((packed)) ShaderParam_tc_texture{int diffuseFilename __attribute__((packed));float Kd __attribute__((packed));int bumpMapFilename __attribute__((packed));float Kb __attribute__((packed));int normalMapFilename __attribute__((packed));float scaleU __attribute__((packed));float scaleV __attribute__((packed));int flipU __attribute__((packed));int flipV __attribute__((packed));};struct __attribute__((packed)) ShaderParametersStruct{uint shaderId __attribute__((packed));union __attribute__((packed)){struct ShaderParam_ashikhmin ashikhmin;struct ShaderParam_ashikhmin_velvet ashikhmin_velvet;struct ShaderParam_debug debug;struct ShaderParam_emitter emitter;struct ShaderParam_emitter_blackbody emitter_blackbody;struct ShaderParam_emitter_textured emitter_textured;struct ShaderParam_glass glass;struct ShaderParam_glass_rough glass_rough;struct ShaderParam_glass_textured glass_textured;struct ShaderParam_glossy glossy;struct ShaderParam_glossy_textured glossy_textured;struct ShaderParam_matte matte;struct ShaderParam_matte_textured matte_textured;struct ShaderParam_metal_rough metal_rough;struct ShaderParam_mirror mirror;struct ShaderParam_mirror_textured mirror_textured;struct ShaderParam_oren_nayar oren_nayar;struct ShaderParam_phong phong;struct ShaderParam_phong_textured phong_textured;struct ShaderParam_transmissive transmissive;struct ShaderParam_mapping_normal mapping_normal;struct ShaderParam_mapping_tangent mapping_tangent;struct ShaderParam_ward ward;struct ShaderParam_soap_bubble soap_bubble;struct ShaderParam_tc_builtinfunctions tc_builtinfunctions;struct ShaderParam_tc_closure_mix tc_closure_mix;struct ShaderParam_tc_normal_modify tc_normal_modify;struct ShaderParam_tc_texture tc_texture;} params __attribute__((packed));};#define ShaderParameters struct ShaderParametersStruct