ShaderToy not running on DavinciResolve

[AJpon]

I'm using Resolve 15 & 16. I installed the latest appveyor builds.
https://ci.appveyor.com/project/NatronGitHub/openfx-misc/builds/30726233/artifacts
But I'm having an error appear at Shadertoy filter while running the filter.

No parameter is exposed to user or OFX Plugin [net.sf.openfx.shadertoy] is NOT available

[devernay]

I think resolve's bad opengl support is to blame.
You may have more luck by using the shadertoy.ofx that comes with Natron binaries, and has mesa3d (software rendering) support.
It would be great to have an appveyor build with mesa3d support, starting by making an appveyor build of mangled osmesa. We use a rather old version of osmesa, but software rendering hasn't evolved much since.
A nice contribution would be to have a powershell version of the Mesa build script, which builds using VS rather than mingw:

https://github.com/NatronGitHub/osmesa-install

[devernay]

Shadertoy with software rendering (Mesa) works fine on macOS Resolve.

[celyk]

The one that comes with 2.6 alpha works in DaVinci Resolve 19.1.4

Copy this file
/Applications/Natron.app/Contents/Plugins/OFX/Natron/Shadertoy.ofx.bundle
To the plugin directory
/Library/OFX/Plugins

Only problem is the "Enable GPU Render" checkbox is greyed out. However, the performance is the same as Natron with the checkbox ticked, indicating that GPU acceleration is working. Changing the CPU Driver has no effect. Can someone explain this?

I have been trying to build the plugin using make, but I can't get it to work in DaVinci. In that case I get the same error as OP.

Specs:

• MacBook Air M2
• macOS 15.3
• DaVinci Resolve 19.1.4

[devernay]

OpenGl acceleration is not available in resolve afaik on, so you're only getting software rendering using osMesa. Mesa has to be built separately, and enabled when building the plugins. To build osMesa see the GitHub repo https://github.com/devernay/osmesa-install
This builds an older version of Mesa that is known to work (more recent versions have issues).

[celyk]

Thanks devernay. It seems that Davinci is using hardware rendering even with OSMesa. There's some helpful comments

openfx-misc/Shadertoy/Shadertoy.cpp

Lines 1293 to 1305 in 0abd46b

	if (getImageEffectHostDescription()->hostName.compare(0, 14, "DaVinciResolve") == 0) {
	// DaVinci Resolve advertises GL supported but doesn't enable it here :|
	// DaVinci always executes the standard render, but when render is called an OpenGL
	// context is attached, thus we can do off-screen rendering.
	// We execute the OpenGL code, but with args.openGLEnabled = false, which creates a
	// framebuffer and reads back the rendered image using glReadPixels.
	openGLRender = true;
	}
	// do the rendering
	if (openGLRender) {
	return renderGL(args);
	}

That explains why changing the CPU driver makes no impact on Davinci. It must be using the GPU for rendering the shader at least. I suspect that theres a step where the texture is copied out through OSMesa or the CPU (glReadPixels).

I am still annoyed that the OpenGL only build does not work, but now I have a better idea of why. Exceptions are being thrown in ShadertoyPluginFactory::describe(), which prevents Davinci from loading the plugin.

openfx-misc/Shadertoy/Shadertoy.cpp

Lines 2332 to 2334 in 0abd46b

	if (!hostDescription.supportsOpenGLRender) {
	throwSuiteStatusException(kOfxStatErrMissingHostFeature);
	}

By skipping those checks I find that any gl calls result in a crash. So I believe that the OpenGL context is no longer accessible as of Davinci 15. Please prove me wrong!

[devernay]

What is displayed when you press the "Renderer info..." button?

[celyk]

Indeed, in Natron the Mesa renderer shows up. I can switch between llvmpipe and softpipe, but swr doesn't work

OpenGL renderer information:
GL_RENDERER = llvmpipe (LLVM 6.0, 128 bits)
GL_VERSION = 3.1 Mesa 18.3.6 (3.1)
GL_VENDOR = VMware, Inc.
GL_SHADING_LANGUAGE_VERSION = 1.40
GL_EXTENSIONS = GL_ARB_multisample GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_copy_texture GL_EXT_subtexture GL_EXT_texture_object GL_EXT_vertex_array GL_EXT_compiled_vertex_array GL_EXT_texture GL_EXT_texture3D GL_IBM_rasterpos_clip GL_ARB_point_parameters GL_EXT_draw_range_elements GL_EXT_packed_pixels GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_separate_specular_color GL_EXT_texture_edge_clamp GL_SGIS_generate_mipmap GL_SGIS_texture_border_clamp GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_ARB_framebuffer_sRGB GL_ARB_multitexture GL_EXT_framebuffer_sRGB GL_IBM_multimode_draw_arrays GL_IBM_texture_mirrored_repeat GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_transpose_matrix GL_EXT_blend_func_separate GL_EXT_fog_coord GL_EXT_multi_draw_arrays GL_EXT_secondary_color GL_EXT_texture_env_add GL_EXT_texture_lod_bias GL_INGR_blend_func_separate GL_NV_blend_square GL_NV_light_max_exponent GL_NV_texgen_reflection GL_NV_texture_env_combine4 GL_S3_s3tc GL_SUN_multi_draw_arrays GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_EXT_framebuffer_object GL_EXT_texture_compression_s3tc GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_MESA_window_pos GL_NV_packed_depth_stencil GL_NV_texture_rectangle GL_ARB_depth_texture GL_ARB_occlusion_query GL_ARB_shadow GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_window_pos GL_ATI_fragment_shader GL_EXT_stencil_two_side GL_EXT_texture_cube_map GL_NV_depth_clamp GL_NV_fog_distance GL_APPLE_packed_pixels GL_ARB_draw_buffers GL_ARB_fragment_program GL_ARB_fragment_shader GL_ARB_shader_objects GL_ARB_vertex_program GL_ARB_vertex_shader GL_ATI_draw_buffers GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_EXT_shadow_funcs GL_EXT_stencil_wrap GL_MESA_pack_invert GL_MESA_ycbcr_texture GL_NV_primitive_restart GL_ARB_depth_clamp GL_ARB_fragment_program_shadow GL_ARB_half_float_pixel GL_ARB_occlusion_query2 GL_ARB_point_sprite GL_ARB_shading_language_100 GL_ARB_sync GL_ARB_texture_non_power_of_two GL_ARB_vertex_buffer_object GL_ATI_blend_equation_separate GL_EXT_blend_equation_separate GL_OES_read_format GL_ARB_color_buffer_float GL_ARB_pixel_buffer_object GL_ARB_texture_compression_rgtc GL_ARB_texture_float GL_ARB_texture_rectangle GL_ATI_texture_compression_3dc GL_EXT_packed_float GL_EXT_pixel_buffer_object GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_mirror_clamp GL_EXT_texture_rectangle GL_EXT_texture_sRGB GL_EXT_texture_shared_exponent GL_ARB_framebuffer_object GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_packed_depth_stencil GL_ARB_vertex_array_object GL_ATI_separate_stencil GL_ATI_texture_mirror_once GL_EXT_draw_buffers2 GL_EXT_draw_instanced GL_EXT_gpu_program_parameters GL_EXT_texture_array GL_EXT_texture_compression_latc GL_EXT_texture_integer GL_EXT_texture_sRGB_decode GL_EXT_timer_query GL_OES_EGL_image GL_ARB_copy_buffer GL_ARB_depth_buffer_float GL_ARB_draw_instanced GL_ARB_half_float_vertex GL_ARB_instanced_arrays GL_ARB_map_buffer_range GL_ARB_texture_buffer_object GL_ARB_texture_rg GL_ARB_texture_swizzle GL_ARB_vertex_array_bgra GL_EXT_texture_swizzle GL_EXT_vertex_array_bgra GL_NV_conditional_render GL_AMD_conservative_depth GL_AMD_draw_buffers_blend GL_AMD_seamless_cubemap_per_texture GL_AMD_shader_stencil_export GL_ARB_ES2_compatibility GL_ARB_blend_func_extended GL_ARB_compatibility GL_ARB_debug_output GL_ARB_draw_buffers_blend GL_ARB_draw_elements_base_vertex GL_ARB_explicit_attrib_location GL_ARB_fragment_coord_conventions GL_ARB_provoking_vertex GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_shader_stencil_export GL_ARB_shader_texture_lod GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_cube_map_array GL_ARB_texture_gather GL_ARB_texture_multisample GL_ARB_texture_query_lod GL_ARB_texture_rgb10_a2ui GL_ARB_uniform_buffer_object GL_ARB_vertex_type_2_10_10_10_rev GL_EXT_provoking_vertex GL_EXT_texture_snorm GL_MESA_texture_signed_rgba GL_ARB_draw_indirect GL_ARB_get_program_binary GL_ARB_robustness GL_ARB_separate_shader_objects GL_ARB_shader_bit_encoding GL_ARB_shader_subroutine GL_ARB_texture_compression_bptc GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_viewport_array GL_AMD_multi_draw_indirect GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ARB_base_instance GL_ARB_compressed_texture_pixel_storage GL_ARB_conservative_depth GL_ARB_internalformat_query GL_ARB_map_buffer_alignment GL_ARB_shading_language_420pack GL_ARB_shading_language_packing GL_ARB_texture_storage GL_ARB_transform_feedback_instanced GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_transform_feedback GL_AMD_shader_trinary_minmax GL_ARB_ES3_compatibility GL_ARB_arrays_of_arrays GL_ARB_clear_buffer_object GL_ARB_copy_image GL_ARB_explicit_uniform_location GL_ARB_fragment_layer_viewport GL_ARB_invalidate_subdata GL_ARB_multi_draw_indirect GL_ARB_program_interface_query GL_ARB_stencil_texturing GL_ARB_texture_buffer_range GL_ARB_texture_query_levels GL_ARB_texture_storage_multisample GL_ARB_texture_view GL_ARB_vertex_attrib_binding GL_KHR_debug GL_KHR_texture_compression_astc_ldr GL_ARB_buffer_storage GL_ARB_clear_texture GL_ARB_enhanced_layouts GL_ARB_internalformat_query2 GL_ARB_multi_bind GL_ARB_seamless_cubemap_per_texture GL_ARB_texture_mirror_clamp_to_edge GL_ARB_texture_stencil8 GL_ARB_vertex_type_10f_11f_11f_rev GL_EXT_shader_integer_mix GL_ARB_clip_control GL_ARB_conditional_render_inverted GL_ARB_cull_distance GL_ARB_direct_state_access GL_ARB_get_texture_sub_image GL_ARB_pipeline_statistics_query GL_ARB_transform_feedback_overflow_query GL_EXT_polygon_offset_clamp GL_KHR_context_flush_control GL_KHR_no_error GL_KHR_texture_compression_astc_sliced_3d GL_MESA_shader_integer_functions GL_ARB_polygon_offset_clamp

In Davinci it always says the same thing, no matter which CPU driver is selected

OpenGL renderer information: GL_RENDERER = Apple 
M2 GL_VERSION = 2.1 Metal - 89.3 (2.1) GL_VENDOR = 
Apple GL_SHADING_LANGUAGE_VERSION = 
1.20 GL_EXTENSIONS = GL_ARB_color_buffer_float 
GL_ARB_depth_buffer_float GL_ARB_depth_clamp 
GL_ARB_depth_texture GL_ARB_draw_buffers 
GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced 
GL_ARB_fragment_program 
GL_ARB_fragment_program_shadow 
GL_ARB_fragment_shader GL_ARB_framebuffer_object 
GL_ARB_framebuffer_sRGB GL_ARB_half_float_pixel 
GL_ARB_half_float_vertex GL_ARB_imaging 
GL_ARB_instanced_arrays GL_ARB_multisample 
GL_ARB_multitexture GL_ARB_occlusion_query 
GL_ARB_pixel_buffer_object GL_ARB_point_parameters 
GL_ARB_point_sprite GL_ARB_provoking_vertex 
GL_ARB_seamless_cube_map GL_ARB_shader_objects 
GL_ARB_shader_texture_lod GL_ARB_shading_language_100 
GL_ARB_shadow GL_ARB_shadow_ambient GL_ARB_sync 
GL_ARB_texture_border_clamp GL_ARB_texture_compression 
GL_ARB_texture_compression_rgtc 
GL_ARB_texture_cube_map GL_ARB_texture_env_add 
GL_ARB_texture_env_combine GL_ARB_texture_e

The string gets cut off, even in the Davinci logs. The rest of it can be seen in Natron if that's important

OpenGL renderer information:
GL_RENDERER = Apple M2
GL_VERSION = 2.1 Metal - 89.3
GL_VENDOR = Apple
GL_SHADING_LANGUAGE_VERSION = 1.20
GL_EXTENSIONS = GL_ARB_color_buffer_float GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_draw_buffers GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_imaging GL_ARB_instanced_arrays GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_provoking_vertex GL_ARB_seamless_cube_map GL_ARB_shader_objects GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shadow GL_ARB_shadow_ambient GL_ARB_sync GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_mirrored_repeat GL_ARB_texture_non_power_of_two GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_transpose_matrix GL_ARB_vertex_array_bgra GL_ARB_vertex_blend GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_EXT_abgr GL_EXT_bgra GL_EXT_bindable_uniform GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_draw_buffers2 GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4 GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture_array GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc GL_EXT_texture_env_add GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod_bias GL_EXT_texture_rectangle GL_EXT_texture_shared_exponent GL_EXT_texture_sRGB GL_EXT_texture_sRGB_decode GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array_bgra GL_APPLE_aux_depth_stencil GL_APPLE_client_storage GL_APPLE_element_array GL_APPLE_fence GL_APPLE_float_pixels GL_APPLE_flush_buffer_range GL_APPLE_flush_render GL_APPLE_packed_pixels GL_APPLE_pixel_buffer GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_specular_vector GL_APPLE_texture_range GL_APPLE_transform_hint GL_APPLE_vertex_array_object GL_APPLE_vertex_point_size GL_APPLE_vertex_program_evaluators GL_APPLE_ycbcr_422 GL_ATI_separate_stencil GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_IBM_rasterpos_clip GL_NV_blend_square GL_NV_conditional_render GL_NV_depth_clamp GL_NV_fog_distance GL_NV_fragment_program_option GL_NV_fragment_program2 GL_NV_light_max_exponent GL_NV_texgen_reflection GL_NV_texture_barrier GL_NV_vertex_program2_option GL_NV_vertex_program3 GL_SGI_color_matrix GL_SGIS_generate_mipmap GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod

[celyk]

I just noticed that the plugin still crashes in nodes. So far I've been using it as an effect applied to the clip. Here are some log files.

Using Shadertoy as a clip generator/effect (Works)
Generator - ResolveDebug_1.txt

Using Shadertoy as a node (Does not work. Crashed)
Node connecting - ResolveDebug.txt