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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>
108 lines
3 KiB
Text
108 lines
3 KiB
Text
#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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menuconfig GRAPHICS_TINYGL
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bool "TinyGL software OpenGL 1.1 subset"
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default n
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---help---
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Enable TinyGL, a small software-only implementation of a subset of
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OpenGL 1.1 originally written by Fabrice Bellard and maintained by
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C-Chads (https://github.com/C-Chads/tinygl).
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TinyGL renders into a memory buffer (struct ZBuffer). The result
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can be copied to a NuttX framebuffer device (/dev/fbN) with
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ZB_copyFrameBuffer(), or TinyGL can render directly into the
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mmap()ed framebuffer memory.
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The sources are downloaded from GitHub at build time and patched
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for NuttX (see the patches in apps/graphics/tinygl).
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if GRAPHICS_TINYGL
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config TINYGL_URL
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string "TinyGL download URL"
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default "https://github.com/C-Chads/tinygl/archive"
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---help---
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Base URL of the TinyGL source archives. The file
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<TINYGL_VERSION>.tar.gz is downloaded from here.
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config TINYGL_VERSION
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string "TinyGL git revision"
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default "36a7987e7bebfda19615ea33341b1cc0ff9c3b13"
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---help---
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Git commit of C-Chads/tinygl to download. The NuttX patches are
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made against this revision.
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choice
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prompt "TinyGL pixel format"
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default TINYGL_RENDER_BITS_32
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config TINYGL_RENDER_BITS_32
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bool "32 bits per pixel (XRGB8888)"
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config TINYGL_RENDER_BITS_16
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bool "16 bits per pixel (RGB565)"
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endchoice # TinyGL pixel format
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config TINYGL_TEXTURE_POW2
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int "Texture size (log2)"
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default 8
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range 4 10
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---help---
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TinyGL uses a single, fixed texture size set at compile time. All
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textures are resized to (1 << TINYGL_TEXTURE_POW2) pixels square.
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The default of 8 means 256x256 textures, which use 256KiB each in
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32-bit mode.
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config TINYGL_SELECT
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bool "Support GL_SELECT and GL_FEEDBACK render modes"
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default n
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---help---
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Enable glRenderMode(GL_SELECT) (object picking with
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glSelectBuffer()/glLoadName()) and GL_FEEDBACK. Enabling this makes
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all rendering slightly slower.
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config TINYGL_GL_POLYGON
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bool "Support GL_POLYGON and GL_LINE_LOOP"
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default y
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---help---
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Enable rendering of general polygons (up to
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TINYGL_POLYGON_MAX_VERTEX vertices) and line loops.
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config TINYGL_POLYGON_MAX_VERTEX
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int "Maximum number of vertices in a GL_POLYGON"
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default 16
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depends on TINYGL_GL_POLYGON
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config TINYGL_BLEND
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bool "Support blending (glBlendFunc)"
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default y
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config TINYGL_BLEND_DRAW_PIXELS
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bool "Apply blending to glDrawPixels()"
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default n
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depends on TINYGL_BLEND
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config TINYGL_POLYGON_STIPPLE
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bool "Support polygon stipple (glPolygonStipple)"
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default y
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config TINYGL_NO_DRAW_COLOR
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bool "Skip texels with the no-draw color (0xff00ff)"
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default y
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---help---
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When enabled, texture mapped pixels whose color is exactly
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magenta (0xff00ff) are not drawn, which gives cheap cut-out
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textures.
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config TINYGL_ERROR_CHECK
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bool "Enable glGetError() error checking"
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default n
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---help---
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Set GL error flags on invalid calls so that they can be read with
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glGetError(). Useful for debugging, slightly slower.
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endif # GRAPHICS_TINYGL
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