add windows build

.gitignore

@@ -1 +1,3 @@
+curl
+glfw
 toy

build.sh

@@ -1 +1 @@
-gcc -O2 -std=c99 -DHAVE_CURL -D_DEBUG *.c jfes/*.c -o toy -lcurl -lglfw -ldl -lm
+gcc -O2 -std=c99 -DHAVE_CURL -D_DEBUG -D_POSIX_C_SOURCE=200809 *.c jfes/*.c -o toy -lcurl -lglfw -ldl -lm

build_win.sh

@@ -0,0 +1,27 @@
+set -e
+
+if [ ! -d "glfw" ]; then
+  git clone --depth=1 https://github.com/glfw/glfw
+  mkdir glfw/build
+  cd glfw/build
+  cmake -DCMAKE_TOOLCHAIN_FILE=../../windows/mingw64.cmake -DGLFW_BUILD_EXAMPLES=0 -DGLFW_BUILD_TESTS=0 -DGLFW_BUILD_DOCS=0 ..
+  make -j4
+  cd ../../
+fi
+
+if [ ! -d "curl" ]; then
+  CC=x86_64-w64-mingw32-gcc
+  export CC
+  git clone --depth=1 https://github.com/curl/curl
+  cd curl
+  ./buildconf
+  mkdir build
+  cd build
+  ../configure --host=x86_64-w64-mingw32 --disable-shared --disable-ldap --with-winssl
+  make -j4
+  cd ../../
+fi
+
+x86_64-w64-mingw32-gcc -static -O2 -std=gnu99 -DHAVE_CURL -DCURL_STATICLIB -D_DEBUG -D_POSIX_C_SOURCE=200809 *.c jfes/*.c -o toy.exe \
+-Lglfw/build/src -Iglfw/include -Lcurl/build/lib/.libs/ -Icurl/include \
+-lcurl -lglfw3 -lpthread -lm -lgdi32 -lws2_32 -lcrypt32

minishadertoy.c

@@ -5,7 +5,12 @@
 #include <assert.h>
 #include <time.h>
 #include <sys/stat.h>
+#ifndef __MINGW32__
 #include <alloca.h>
+#define MKDIRARGS ,0777
+#else
+#define MKDIRARGS
+#endif
 #include <errno.h>
 #include "glad.h"
 #include "jfes/jfes.h"
@@ -111,7 +116,7 @@ static int mkpath(char *path)
 
     if (buffer[len - 1] == '/')
         buffer[len - 1] = '\0';
-    if (mkdir(buffer, 0777) == 0)
+    if (mkdir(buffer MKDIRARGS) == 0)
     {
         free(buffer);
         return 1;
@@ -126,7 +131,7 @@ static int mkpath(char *path)
             break;
         char sav = *p;
         *p = 0;
-        if ((mkdir(buffer, 0777) == -1) && (errno == ENOENT))
+        if ((mkdir(buffer MKDIRARGS) == -1) && (errno == ENOENT))
             goto fail;
         *p++ = sav;
     }

windows/mingw64.cmake

@@ -0,0 +1,11 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
+
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX})
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)