Add stb_image and PortableGL to libretro builds

meson.build

@@ -474,6 +474,8 @@ if is_libretro
         cmake.subproject('libsndfile', options: libsndfile_options).dependency('sndfile'),
         cmake.subproject('pixman-region', options: pixman_region_options).dependency('pixman-region'),
         cmake.subproject('libpng', options: libpng_options).dependency('png_static'),
+        subproject('stb').get_variable('stb'),
+        subproject('portablegl').get_variable('portablegl'),
     ]
     if host_system == 'darwin'
         libretro_deps += compilers['cpp'].find_library('iconv')
@@ -544,7 +546,9 @@ if is_libretro
         sources: global_sources + [
             'src/core.cpp',
             'src/mkxp-threads.cpp',
+            'src/portablegl.cpp',
             'src/sharedstate.cpp',
+            'src/stb_image.cpp',
             'src/audio/alstream.cpp',
             'src/audio/audio.cpp',
             'src/audio/audiostream.cpp',

src/portablegl.cpp

@@ -0,0 +1,2 @@
+#define PORTABLEGL_IMPLEMENTATION
+#include <portablegl.h>

src/stb_image.cpp

@@ -0,0 +1,2 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image.h>

subprojects/packagefiles/portablegl/meson.build

@@ -0,0 +1,2 @@
+project('portablegl', 'c', meson_version: '>=1.3.0')
+portablegl = declare_dependency(include_directories: '.')

subprojects/packagefiles/stb/meson.build

@@ -0,0 +1,2 @@
+project('stb', 'c', meson_version: '>=1.3.0')
+stb = declare_dependency(include_directories: '.')

subprojects/portablegl.wrap

@@ -0,0 +1,5 @@
+[wrap-git]
+url = https://github.com/rswinkle/PortableGL
+revision = 0.98.0
+depth = 1
+patch_directory = portablegl

subprojects/stb.wrap

@@ -0,0 +1,5 @@
+[wrap-git]
+url = https://github.com/nothings/stb
+revision = 5c205738c191bcb0abc65c4febfa9bd25ff35234
+depth = 1
+patch_directory = stb