graphics/tinygl: add TinyGL software OpenGL library - #3801
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xiaoxiang781216
September 25, 2026 17:52
Add TinyGL (https://github.com/C-Chads/tinygl), a small software-only implementation of a subset of OpenGL 1.1 written in portable C99, by Fabrice Bellard, Gek and C-Chads, under a zlib-style license. Like graphics/lvgl, the sources are not kept in the repository: the build downloads a pinned git revision from GitHub (CONFIG_TINYGL_VERSION) and applies the NuttX patches that live next to the Makefile: 0001 zfeatures: allow overriding the feature switches at build time 0002 Fix -Wstrict-prototypes warnings 0003 zbuffer: do not over-read the source in ZB_copyFrameBuffer() 0004 zbuffer.h: make the default allocator wrappers static inline The TinyGL compile time features (pixel depth, GL_SELECT, GL_POLYGON, blending, texture size, ...) are exposed as CONFIG_TINYGL_* Kconfig options. They change public structures, so Make.defs / CMakeLists.txt export them to every application that includes <GL/gl.h> or <zbuffer.h>. Both the make and the CMake builds are supported. An unpack stamp file makes sure an object directory created inside the source tree is never mistaken for downloaded sources. Assisted-by: Claude Opus 5.5 (1M context) Signed-off-by: Alan Carvalho de Assis <acassis@gmail.com>
Render Brian Paul's classic OpenGL "gears" demo with TinyGL on a NuttX framebuffer device. TinyGL draws each frame into its own ZBuffer, which is then copied to the mmap()ed framebuffer (plus FBIO_UPDATE when CONFIG_FB_UPDATE is enabled), so partially drawn frames are never shown. The frame rate is printed every five seconds. Usage: tinygl [frames] [fbdev] Tested on sim:tinygl (640x480, 32 bpp): about 1400 FPS with CONFIG_DEBUG_FULLOPT on an x86_64 host, with both make and CMake. Assisted-By: Claude Opus 5.5 (1M context) Signed-off-by: Alan Carvalho de Assis <acassis@gmail.com>
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@xiaoxiang781216 PTAL Please ignore the CI Check typo "lightening" it is on original tinygl code, not someone from this PR |
xiaoxiang781216
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Sep 28, 2026
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Summary
Add TinyGL (https://github.com/C-Chads/tinygl), a small software-only implementation of a subset of OpenGL 1.1 written in portable C99, by Fabrice Bellard, Gek and C-Chads, under a zlib-style license.
Like graphics/lvgl, the sources are not kept in the repository: the build downloads a pinned git revision from GitHub
(CONFIG_TINYGL_VERSION) and applies the NuttX patches that live next to the Makefile:
0001 zfeatures: allow overriding the feature switches at build time
0002 Fix -Wstrict-prototypes warnings
0003 zbuffer: do not over-read the source in ZB_copyFrameBuffer()
0004 zbuffer.h: make the default allocator wrappers static inline
The TinyGL compile time features (pixel depth, GL_SELECT, GL_POLYGON, blending, texture size, ...) are exposed as CONFIG_TINYGL_* Kconfig options. They change public structures, so Make.defs / CMakeLists.txt export them to every application that includes <GL/gl.h> or <zbuffer.h>.
Both the make and the CMake builds are supported. An unpack stamp file makes sure an object directory created inside the source tree is never mistaken for downloaded sources.
Impact
Users will be able to use OpenGL on NuttX
Testing
TinyGL Gears