做特价的网站百度,久久建筑服务网,wordpress配置文件在哪,10号店分销平台概述
本来想将一个完整的可以从hlsl-dxil-spirv-nir-code的项目划分为两个动态库a.dll与b.dll。应用程序调用a.dll与b.dll执行相同的过程。 a.dll#xff1a;执行dxil-spirv-nir前端相关的转换。 b.dll#xff1a;执行nir-code的转换。 应用程序调用dxc实现hlsl-dxil的过程执行dxil-spirv-nir前端相关的转换。 b.dll执行nir-code的转换。 应用程序调用dxc实现hlsl-dxil的过程调用a.dll实现dxil-spirv-nir过程调用b.dll实现nir-code过程。 想法是好的可以使代码结构清晰。 不过出现了问题在b.dll实现nir-code过程出现崩溃
分析
在spirv-nir过程是可以的在nir-code过程中执行pass出现错误
nir_shader* nir spirv_to_nir((uint32_t*)spirv.data, word_count, NULL, 0,entry_point.stage, entry_point.name,spirv_opts, nir_opts);原因是nir_opts参数控制了很多lower的行为。在进入b.dll执行nir-code过程nir_opts所有的数据都为0了。 后来想一想每个动态库都是一个独立的程序全局变量不能跨程序保留值。 查阅nir结构看看有没有保留的地方结果发现了如下
typedef struct nir_shader {gc_ctx *gctx;/** list of uniforms (nir_variable) */struct exec_list variables;/** Set of driver-specific options for the shader.** The memory for the options is expected to be kept in a single static* copy by the driver.*/const struct nir_shader_compiler_options *options;/** Various bits of compile-time information about a given shader */struct shader_info info;/** list of nir_function */struct exec_list functions;/*** The size of the variable space for load_input_*, load_uniform_*, etc.* intrinsics. This is in back-end specific units which is likely one of* bytes, dwords, or vec4s depending on context and back-end.*/unsigned num_inputs, num_uniforms, num_outputs;/** Size in bytes of required implicitly bound global memory */unsigned global_mem_size;/** Size in bytes of required scratch space */unsigned scratch_size;/** Constant data associated with this shader.** Constant data is loaded through load_constant intrinsics (as compared to* the NIR load_const instructions which have the constant value inlined* into them). This is usually generated by nir_opt_large_constants (so* shaders dont have to load_const into a temporary array when they want* to indirect on a const array).*/void *constant_data;/** Size of the constant data associated with the shader, in bytes */unsigned constant_data_size;struct nir_xfb_info *xfb_info;unsigned printf_info_count;u_printf_info *printf_info;
} nir_shader;const struct nir_shader_compiler_options *options;就是保存option的地方。 在调用完a.dll之后通过手动给他们复制发现暂时可以解决问题。
不过运行到后面又出现问题
NIR_PASS_V(nir, nir_split_var_copies);在上面pass宏定义中执行nir_shader_serialize_deserialize函数崩溃在该函数中执行glsl_array_type函数崩溃。
const glsl_type *
glsl_array_type(const glsl_type *element,unsigned array_size,unsigned explicit_stride)
{/* Ensure theres no internal padding, to avoid multiple hashes for same key. */STATIC_ASSERT(sizeof(struct array_key) (3 * sizeof(uintptr_t)));struct array_key key { 0 };key.element (uintptr_t)element;key.array_size array_size;key.explicit_stride explicit_stride;const uint32_t key_hash array_key_hash(key);simple_mtx_lock(glsl_type_cache_mutex);assert(glsl_type_cache.users 0); //崩溃在这里glsl_type_cache全局变量都是0void *mem_ctx glsl_type_cache.mem_ctx;if (glsl_type_cache.array_types NULL) {glsl_type_cache.array_types array_key_table_create(mem_ctx);}struct hash_table *array_types glsl_type_cache.array_types;const struct hash_entry *entry _mesa_hash_table_search_pre_hashed(array_types, key_hash, key);if (entry NULL) {linear_ctx *lin_ctx glsl_type_cache.lin_ctx;const glsl_type *t make_array_type(lin_ctx, element, array_size, explicit_stride);struct array_key *stored_key linear_zalloc(lin_ctx, struct array_key);memcpy(stored_key, key, sizeof(key));entry _mesa_hash_table_insert_pre_hashed(array_types, key_hash,stored_key,(void *) t);}const glsl_type *t (const glsl_type *) entry-data;simple_mtx_unlock(glsl_type_cache_mutex);assert(t-base_type GLSL_TYPE_ARRAY);assert(t-length array_size);assert(t-fields.array element);return t;
}发现glsl_type_cache全局结构体成员变量都是0。 至此可以得出结论在spirv-nir转换的过程中对很多全局变量赋值了如果不在同一个动态库中调用那么就会出现全局变量统统为0的情况。
解决
将dxil-spirv-nir-code写到同一个动态库a.dll中应用程序调用dxc实现hlsl-dxil的过程调用a.dll实现dxil-spirv-nir-code过程发现问题全部解决。
