Rendering without graphics on GLES3 compatible cards

[mrfixit2001]

There isn't a segfault but the programs render without graphics.

Everything runs fine when I run the application on a RK3328 that uses a Mali UTGard 450 that supports only GLES2.

However when I run the same programs on a RK3399 that uses a Mali Midgard 860 that supports up to GLES3 then I see a number of applications rendering without graphics. No crashes, and audio plays, but no graphics are rendered.

The only application where I can absolutely confirm that sdl12-compat is the issue is netsurf, so for now I'll limit the scope of the issue to that, but I expect other applications will be affected by the same bug.

I see another issue opened for netsurf so I've run the recommended GDB on that binary to confirm it's selected KMSDRM.
#155

I can confirm when using normal SDL1.2 that netsurf does display properly.

I have tested with both SDL v2.0.18 and v2.0.20.

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
INFO: sdl12-compat, built on Mar 21 2022 at 14:47:25, talking to SDL2 2.0.20
Identified kernel 4.4, initializing full graphics stack
[Detaching after vfork from child process 24230]
REQUESTING RESOLUTION: 1024x768
Found encoder crtc
[New Thread 0xf55753c0 (LWP 24252)]
[New Thread 0xf4d743c0 (LWP 24253)]
[New Thread 0xf45733c0 (LWP 24254)]
[New Thread 0xf3d723c0 (LWP 24255)]
[New Thread 0xf35713c0 (LWP 24256)]
[New Thread 0xf2d703c0 (LWP 24257)]
[New Thread 0xf256f3c0 (LWP 24258)]
[New Thread 0xf1d6e3c0 (LWP 24259)]
[New Thread 0xf156d3c0 (LWP 24260)]
arm_release_ver of this libmali is 'r18p0-01rel0', rk_so_ver is '4'.Using display 0x3e91c8 with EGL version 1.4
EGL Version "1.4 Midgard-"r18p0-01rel0""
EGL Vendor "ARM"
EGL Extensions "EGL_KHR_partial_update EGL_KHR_image_pixmap EGL_EXT_image_dma_buf_import EGL_KHR_config_attribs EGL_KHR_ima ge EGL_KHR_image_base EGL_KHR_fence_sync EGL_KHR_wait_sync EGL_KHR_gl_colorspace EGL_KHR_get_all_proc_addresses EGL_IMG_con text_priority EGL_ARM_pixmap_multisample_discard EGL_ARM_implicit_external_sync EGL_KHR_gl_texture_2D_image EGL_KHR_gl_rend erbuffer_image EGL_KHR_create_context EGL_KHR_surfaceless_context EGL_KHR_gl_texture_cubemap_image EGL_EXT_create_context_r obustness"
GL Extensions: "GL_ARM_rgba8 GL_ARM_mali_shader_binary GL_OES_depth24 GL_OES_depth_texture GL_OES_depth_texture_cube_map GL _OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_EXT_read_format_bgra GL_OES_compressed_paletted_texture GL_OES_compressed_ET C1_RGB8_texture GL_OES_standard_derivatives GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_O ES_EGL_sync GL_OES_texture_npot GL_OES_vertex_half_float GL_OES_required_internalformat GL_OES_vertex_array_object GL_OES_m apbuffer GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_type_2_10_10_10_REV GL_OES_fbo_render_mipmap GL_OE S_element_index_uint GL_EXT_shadow_samplers GL_OES_texture_compression_astc GL_KHR_texture_compression_astc_ldr GL_KHR_text ure_compression_astc_hdr GL_KHR_texture_compression_astc_sliced_3d GL_KHR_debug GL_EXT_occlusion_query_boolean GL_EXT_disjo int_timer_query GL_EXT_blend_minmax GL_EXT_discard_framebuffer GL_OES_get_program_binary GL_OES_texture_3D GL_EXT_texture_s torage GL_EXT_multisampled_render_to_texture GL_OES_surfaceless_context GL_OES_texture_stencil8 GL_EXT_shader_pixel_local_s torage GL_ARM_shader_framebuffer_fetch GL_ARM_shader_framebuffer_fetch_depth_stencil GL_ARM_mali_program_binary GL_EXT_sRGB  GL_EXT_sRGB_write_control GL_EXT_texture_sRGB_decode GL_EXT_texture_sRGB_R8 GL_EXT_texture_sRGB_RG8 GL_KHR_blend_equation_ advanced GL_KHR_blend_equation_advanced_coherent GL_OES_texture_storage_multisample_2d_array GL_OES_shader_image_atomic GL_ EXT_robustness GL_EXT_draw_buffers_indexed GL_OES_draw_buffers_indexed GL_EXT_texture_border_clamp GL_OES_texture_border_cl amp GL_EXT_texture_cube_map_array GL_OES_texture_cube_map_array GL_OES_sample_variables GL_OES_sample_shading GL_OES_shader _multisample_interpolation GL_EXT_shader_io_blocks GL_OES_shader_io_blocks GL_EXT_tessellation_shader GL_OES_tessellation_s hader GL_EXT_primitive_bounding_box GL_OES_primitive_bounding_box GL_EXT_geometry_shader GL_OES_geometry_shader GL_ANDROID_ extension_pack_es31a GL_EXT_gpu_shader5 GL_OES_gpu_shader5 GL_EXT_texture_buffer GL_OES_texture_buffer GL_EXT_copy_image GL _OES_copy_image GL_EXT_color_buffer_half_float GL_EXT_color_buffer_float GL_EXT_YUV_target GL_OVR_multiview GL_OVR_multivie w2 GL_OVR_multiview_multisampled_render_to_texture GL_KHR_robustness GL_KHR_robust_buffer_access_behavior GL_EXT_draw_eleme nts_base_vertex GL_OES_draw_elements_base_vertex "
INFO: FIXME: there is never a parachute in SDL2, should we catch segfaults ourselves? (SDL_Init:1866)
INFO: FIXME: support SDL_INIT_EVENTTHREAD where it makes sense? (SDL_InitSubSystem:1832)

Thread 1 "netsurf-fb" hit Breakpoint 1, 0xf55d10a8 in SDL_Init_REAL () from /usr/lib/libSDL2-2.0.so.0
(gdb) fin
Run till exit from #0  0xf55d10a8 in SDL_Init_REAL () from /usr/lib/libSDL2-2.0.so.0
[New Thread 0xf08ff3c0 (LWP 24265)]
0xf5e595c0 in SDL_InitSubSystem () from /usr/lib/libSDL-1.2.so.0
(gdb) p (const char *) SDL_GetCurrentVideoDriver()
$1 = 0xf56e5c44 "KMSDRM"
(gdb)

In case it's somehow related, I experienced a similar behavior in a prior issue that is still open and was able to resolve by limiting to a single thread. I don't have an easy config for that in netsurf.
#110

[icculus]

I believe I just fixed this issue, but I do not have an environment to test this.

If the latest sdl12-compat (and possibly SDL 2.24.0) doesn't fix your issue, please let me know and I'll reopen this bug. Thanks!