OBS图形核心模块

OBS的核心结构模块图如下：

其关于视频处理的参数及函数都是由struct obs_core_video video成员来保存。而对于图形处理由是由统一的graphcis.c来实现，其根据struct obs_video_info ovi;传递的模块名加载不同的dll,可以是opengl的，也可以是d3d11的。

这其中关于graphics.h导出的函数包括有：

#define GRAPHICS_IMPORT(func)                                     \
    do {                                                      \
        exports->func = os_dlsym(module, #func);          \
        if (!exports->func) {                             \
            success = false;                          \
            blog(LOG_ERROR,                           \
                 "Could not load function '%s' from " \
                 "module '%s'",                       \
                 #func, module_name);                 \
        }                                                 \
    } while (false)

#define GRAPHICS_IMPORT_OPTIONAL(func)                   \
    do {                                             \
        exports->func = os_dlsym(module, #func); \
    } while (false)

bool load_graphics_imports(struct gs_exports *exports, void *module,
               const char *module_name)
{
    bool success = true;

    GRAPHICS_IMPORT(device_get_name);
    GRAPHICS_IMPORT(device_get_type);
    GRAPHICS_IMPORT_OPTIONAL(device_enum_adapters);
    GRAPHICS_IMPORT(device_preprocessor_name);
    GRAPHICS_IMPORT(device_create);
    GRAPHICS_IMPORT(device_destroy);
    GRAPHICS_IMPORT(device_enter_context);
    GRAPHICS_IMPORT(device_leave_context);
    GRAPHICS_IMPORT(device_get_device_obj);
    GRAPHICS_IMPORT(device_swapchain_create);
    GRAPHICS_IMPORT(device_resize);
    GRAPHICS_IMPORT(device_get_color_space);
    GRAPHICS_IMPORT(device_update_color_space);
    GRAPHICS_IMPORT(device_get_size);
    GRAPHICS_IMPORT(device_get_width);
    GRAPHICS_IMPORT(device_get_height);
    GRAPHICS_IMPORT(device_texture_create);
    GRAPHICS_IMPORT(device_cubetexture_create);
    GRAPHICS_IMPORT(device_voltexture_create);
    GRAPHICS_IMPORT(device_zstencil_create);
    GRAPHICS_IMPORT(device_stagesurface_create);
    GRAPHICS_IMPORT(device_samplerstate_create);
    GRAPHICS_IMPORT(device_vertexshader_create);
    GRAPHICS_IMPORT(device_pixelshader_create);
    GRAPHICS_IMPORT(device_vertexbuffer_create);
    GRAPHICS_IMPORT(device_indexbuffer_create);
    GRAPHICS_IMPORT(device_timer_create);
    GRAPHICS_IMPORT(device_timer_range_create);
    GRAPHICS_IMPORT(device_get_texture_type);
    GRAPHICS_IMPORT(device_load_vertexbuffer);
    GRAPHICS_IMPORT(device_load_indexbuffer);
    GRAPHICS_IMPORT(device_load_texture);
    GRAPHICS_IMPORT(device_load_samplerstate);
    GRAPHICS_IMPORT(device_load_vertexshader);
    GRAPHICS_IMPORT(device_load_pixelshader);
    GRAPHICS_IMPORT(device_load_default_samplerstate);
    GRAPHICS_IMPORT(device_get_vertex_shader);
    GRAPHICS_IMPORT(device_get_pixel_shader);
    GRAPHICS_IMPORT(device_get_render_target);
    GRAPHICS_IMPORT(device_get_zstencil_target);
    GRAPHICS_IMPORT(device_set_render_target);
    GRAPHICS_IMPORT(device_set_render_target_with_color_space);
    GRAPHICS_IMPORT(device_set_cube_render_target);
    GRAPHICS_IMPORT(device_enable_framebuffer_srgb);
    GRAPHICS_IMPORT(device_framebuffer_srgb_enabled);
    GRAPHICS_IMPORT(device_copy_texture_region);
    GRAPHICS_IMPORT(device_copy_texture);
    GRAPHICS_IMPORT(device_stage_texture);
    GRAPHICS_IMPORT(device_begin_frame);
    GRAPHICS_IMPORT(device_begin_scene);
    GRAPHICS_IMPORT(device_draw);
    GRAPHICS_IMPORT(device_load_swapchain);
    GRAPHICS_IMPORT(device_end_scene);
    GRAPHICS_IMPORT(device_clear);
    GRAPHICS_IMPORT(device_is_present_ready);
    GRAPHICS_IMPORT(device_present);
    GRAPHICS_IMPORT(device_flush);
    GRAPHICS_IMPORT(device_set_cull_mode);
    GRAPHICS_IMPORT(device_get_cull_mode);
    GRAPHICS_IMPORT(device_enable_blending);
    GRAPHICS_IMPORT(device_enable_depth_test);
    GRAPHICS_IMPORT(device_enable_stencil_test);
    GRAPHICS_IMPORT(device_enable_stencil_write);
    GRAPHICS_IMPORT(device_enable_color);
    GRAPHICS_IMPORT(device_blend_function);
    GRAPHICS_IMPORT(device_blend_function_separate);
    GRAPHICS_IMPORT(device_blend_op);
    GRAPHICS_IMPORT(device_depth_function);
    GRAPHICS_IMPORT(device_stencil_function);
    GRAPHICS_IMPORT(device_stencil_op);
    GRAPHICS_IMPORT(device_set_viewport);
    GRAPHICS_IMPORT(device_get_viewport);
    GRAPHICS_IMPORT(device_set_scissor_rect);
    GRAPHICS_IMPORT(device_ortho);
    GRAPHICS_IMPORT(device_frustum);
    GRAPHICS_IMPORT(device_projection_push);
    GRAPHICS_IMPORT(device_projection_pop);

    GRAPHICS_IMPORT(gs_swapchain_destroy);

    GRAPHICS_IMPORT(gs_texture_destroy);
    GRAPHICS_IMPORT(gs_texture_get_width);
    GRAPHICS_IMPORT(gs_texture_get_height);
    GRAPHICS_IMPORT(gs_texture_get_color_format);
    GRAPHICS_IMPORT(gs_texture_map);
    GRAPHICS_IMPORT(gs_texture_unmap);
    GRAPHICS_IMPORT_OPTIONAL(gs_texture_is_rect);
    GRAPHICS_IMPORT(gs_texture_get_obj);

    GRAPHICS_IMPORT(gs_cubetexture_destroy);
    GRAPHICS_IMPORT(gs_cubetexture_get_size);
    GRAPHICS_IMPORT(gs_cubetexture_get_color_format);

    GRAPHICS_IMPORT(gs_voltexture_destroy);
    GRAPHICS_IMPORT(gs_voltexture_get_width);
    GRAPHICS_IMPORT(gs_voltexture_get_height);
    GRAPHICS_IMPORT(gs_voltexture_get_depth);
    GRAPHICS_IMPORT(gs_voltexture_get_color_format);

    GRAPHICS_IMPORT(gs_stagesurface_destroy);
    GRAPHICS_IMPORT(gs_stagesurface_get_width);
    GRAPHICS_IMPORT(gs_stagesurface_get_height);
    GRAPHICS_IMPORT(gs_stagesurface_get_color_format);
    GRAPHICS_IMPORT(gs_stagesurface_map);
    GRAPHICS_IMPORT(gs_stagesurface_unmap);

    GRAPHICS_IMPORT(gs_zstencil_destroy);

    GRAPHICS_IMPORT(gs_samplerstate_destroy);

    GRAPHICS_IMPORT(gs_vertexbuffer_destroy);
    GRAPHICS_IMPORT(gs_vertexbuffer_flush);
    GRAPHICS_IMPORT(gs_vertexbuffer_flush_direct);
    GRAPHICS_IMPORT(gs_vertexbuffer_get_data);

    GRAPHICS_IMPORT(gs_indexbuffer_destroy);
    GRAPHICS_IMPORT(gs_indexbuffer_flush);
    GRAPHICS_IMPORT(gs_indexbuffer_flush_direct);
    GRAPHICS_IMPORT(gs_indexbuffer_get_data);
    GRAPHICS_IMPORT(gs_indexbuffer_get_num_indices);
    GRAPHICS_IMPORT(gs_indexbuffer_get_type);

    GRAPHICS_IMPORT(gs_timer_destroy);
    GRAPHICS_IMPORT(gs_timer_begin);
    GRAPHICS_IMPORT(gs_timer_end);
    GRAPHICS_IMPORT(gs_timer_get_data);
    GRAPHICS_IMPORT(gs_timer_range_destroy);
    GRAPHICS_IMPORT(gs_timer_range_begin);
    GRAPHICS_IMPORT(gs_timer_range_end);
    GRAPHICS_IMPORT(gs_timer_range_get_data);

    GRAPHICS_IMPORT(gs_shader_destroy);
    GRAPHICS_IMPORT(gs_shader_get_num_params);
    GRAPHICS_IMPORT(gs_shader_get_param_by_idx);
    GRAPHICS_IMPORT(gs_shader_get_param_by_name);
    GRAPHICS_IMPORT(gs_shader_get_viewproj_matrix);
    GRAPHICS_IMPORT(gs_shader_get_world_matrix);
    GRAPHICS_IMPORT(gs_shader_get_param_info);
    GRAPHICS_IMPORT(gs_shader_set_bool);
    GRAPHICS_IMPORT(gs_shader_set_float);
    GRAPHICS_IMPORT(gs_shader_set_int);
    GRAPHICS_IMPORT(gs_shader_set_matrix3);
    GRAPHICS_IMPORT(gs_shader_set_matrix4);
    GRAPHICS_IMPORT(gs_shader_set_vec2);
    GRAPHICS_IMPORT(gs_shader_set_vec3);
    GRAPHICS_IMPORT(gs_shader_set_vec4);
    GRAPHICS_IMPORT(gs_shader_set_texture);
    GRAPHICS_IMPORT(gs_shader_set_val);
    GRAPHICS_IMPORT(gs_shader_set_default);
    GRAPHICS_IMPORT(gs_shader_set_next_sampler);

    GRAPHICS_IMPORT_OPTIONAL(device_nv12_available);
    GRAPHICS_IMPORT_OPTIONAL(device_p010_available);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_create_nv12);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_create_p010);

    GRAPHICS_IMPORT(device_is_monitor_hdr);

    GRAPHICS_IMPORT(device_debug_marker_begin);
    GRAPHICS_IMPORT(device_debug_marker_end);

    GRAPHICS_IMPORT_OPTIONAL(gs_get_adapter_count);

    /* OSX/Cocoa specific functions */
#ifdef __APPLE__
    GRAPHICS_IMPORT(device_shared_texture_available);
    GRAPHICS_IMPORT(device_texture_open_shared);
    GRAPHICS_IMPORT(device_texture_create_from_iosurface);
    GRAPHICS_IMPORT(gs_texture_rebind_iosurface);

    /* win32 specific functions */
#elif _WIN32
    GRAPHICS_IMPORT(device_gdi_texture_available);
    GRAPHICS_IMPORT(device_shared_texture_available);
    GRAPHICS_IMPORT_OPTIONAL(device_get_duplicator_monitor_info);
    GRAPHICS_IMPORT_OPTIONAL(device_duplicator_get_monitor_index);
    GRAPHICS_IMPORT_OPTIONAL(device_duplicator_create);
    GRAPHICS_IMPORT_OPTIONAL(gs_duplicator_destroy);
    GRAPHICS_IMPORT_OPTIONAL(gs_duplicator_update_frame);
    GRAPHICS_IMPORT_OPTIONAL(gs_duplicator_get_texture);
    GRAPHICS_IMPORT_OPTIONAL(gs_duplicator_get_color_space);
    GRAPHICS_IMPORT_OPTIONAL(gs_duplicator_get_sdr_white_level);
    GRAPHICS_IMPORT_OPTIONAL(device_can_adapter_fast_clear);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_create_gdi);
    GRAPHICS_IMPORT_OPTIONAL(gs_texture_get_dc);
    GRAPHICS_IMPORT_OPTIONAL(gs_texture_release_dc);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_open_shared);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_open_nt_shared);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_get_shared_handle);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_wrap_obj);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_acquire_sync);
    GRAPHICS_IMPORT_OPTIONAL(device_texture_release_sync);
    GRAPHICS_IMPORT_OPTIONAL(device_stagesurface_create_nv12);
    GRAPHICS_IMPORT_OPTIONAL(device_stagesurface_create_p010);
    GRAPHICS_IMPORT_OPTIONAL(device_register_loss_callbacks);
    GRAPHICS_IMPORT_OPTIONAL(device_unregister_loss_callbacks);
#elif defined(__linux__) || defined(__FreeBSD__) || defined(__DragonFly__)
    GRAPHICS_IMPORT(device_texture_create_from_dmabuf);
    GRAPHICS_IMPORT(device_query_dmabuf_capabilities);
    GRAPHICS_IMPORT(device_query_dmabuf_modifiers_for_format);
    GRAPHICS_IMPORT(device_texture_create_from_pixmap);
#endif

    return success;
}