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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>
55 lines
2.6 KiB
Text
55 lines
2.6 KiB
Text
############################################################################
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# apps/graphics/tinygl/Make.defs
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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ifneq ($(CONFIG_GRAPHICS_TINYGL),)
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CONFIGURED_APPS += $(APPDIR)/graphics/tinygl
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# TinyGL public headers: <GL/gl.h>, <zbuffer.h> and <zfeatures.h>
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CFLAGS += ${INCDIR_PREFIX}$(APPDIR)/graphics/tinygl/tinygl/include
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CXXFLAGS += ${INCDIR_PREFIX}$(APPDIR)/graphics/tinygl/tinygl/include
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# The TinyGL feature switches change the layout of public structures (for
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# example struct ZBuffer and the PIXEL type), so they must be seen by both
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# the library and every application that includes the TinyGL headers.
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tgl_bool = $(if $(filter y,$(1)),1,0)
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TINYGL_DEFINES = -DTGL_FEATURE_32_BITS=$(call tgl_bool,$(CONFIG_TINYGL_RENDER_BITS_32))
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TINYGL_DEFINES += -DTGL_FEATURE_16_BITS=$(call tgl_bool,$(CONFIG_TINYGL_RENDER_BITS_16))
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TINYGL_DEFINES += -DTGL_FEATURE_TEXTURE_POW2=$(CONFIG_TINYGL_TEXTURE_POW2)
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TINYGL_DEFINES += -DTGL_FEATURE_ALT_RENDERMODES=$(call tgl_bool,$(CONFIG_TINYGL_SELECT))
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TINYGL_DEFINES += -DTGL_FEATURE_GL_POLYGON=$(call tgl_bool,$(CONFIG_TINYGL_GL_POLYGON))
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TINYGL_DEFINES += -DTGL_FEATURE_BLEND=$(call tgl_bool,$(CONFIG_TINYGL_BLEND))
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TINYGL_DEFINES += -DTGL_FEATURE_BLEND_DRAW_PIXELS=$(call tgl_bool,$(CONFIG_TINYGL_BLEND_DRAW_PIXELS))
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TINYGL_DEFINES += -DTGL_FEATURE_POLYGON_STIPPLE=$(call tgl_bool,$(CONFIG_TINYGL_POLYGON_STIPPLE))
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TINYGL_DEFINES += -DTGL_FEATURE_NO_DRAW_COLOR=$(call tgl_bool,$(CONFIG_TINYGL_NO_DRAW_COLOR))
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TINYGL_DEFINES += -DTGL_FEATURE_ERROR_CHECK=$(call tgl_bool,$(CONFIG_TINYGL_ERROR_CHECK))
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ifneq ($(CONFIG_TINYGL_POLYGON_MAX_VERTEX),)
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TINYGL_DEFINES += -DPOLYGON_MAX_VERTEX=$(CONFIG_TINYGL_POLYGON_MAX_VERTEX)
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endif
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CFLAGS += $(TINYGL_DEFINES)
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CXXFLAGS += $(TINYGL_DEFINES)
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endif
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