Add minimal emscripten support

PadWorld-Entertainment · Jun 9, 2024 · c459736 · c459736
1 parent 265d9db
commit c459736
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Showing 3 changed files with 40 additions and 1 deletion.
diff --git a/code/qcommon/q_platform.h b/code/qcommon/q_platform.h
@@ -298,6 +298,22 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 #endif
 
+//================================================================== EMSCRIPTEN ===
+
+#ifdef __EMSCRIPTEN__
+
+#define OS_STRING "emscripten"
+#define ID_INLINE inline
+#define PATH_SEP '/'
+
+#define ARCH_STRING "wasm32"
+
+#define Q3_LITTLE_ENDIAN
+
+#define DLL_EXT ".wasm"
+
+#endif
+
 //================================================================== Q3VM ===
 
 #ifdef Q3_VM

diff --git a/code/sdl/sdl_glimp.c b/code/sdl/sdl_glimp.c
@@ -380,7 +380,7 @@ static int GLimp_SetMode(int mode, qboolean fullscreen, qboolean noborder, qbool
 		int profileMask;
 		int majorVersion;
 		int minorVersion;
-	} contexts[3];
+	} contexts[4];
 	int numContexts, type;
 	const char *glstring;
 	int perChannelColorBits;
@@ -502,6 +502,14 @@ static int GLimp_SetMode(int mode, qboolean fullscreen, qboolean noborder, qbool
 						  (r_preferOpenGLES->integer == -1 && profileMask == SDL_GL_CONTEXT_PROFILE_ES));
 
 		if (preferOpenGLES) {
+#ifdef __EMSCRIPTEN__
+			// WebGL 2.0 isn't fully backward compatible so you have to ask for it specifically
+			contexts[numContexts].profileMask = SDL_GL_CONTEXT_PROFILE_ES;
+			contexts[numContexts].majorVersion = 3;
+			contexts[numContexts].minorVersion = 0;
+			numContexts++;
+#endif
+
 			contexts[numContexts].profileMask = SDL_GL_CONTEXT_PROFILE_ES;
 			contexts[numContexts].majorVersion = 2;
 			contexts[numContexts].minorVersion = 0;
@@ -519,6 +527,13 @@ static int GLimp_SetMode(int mode, qboolean fullscreen, qboolean noborder, qbool
 		numContexts++;
 
 		if (!preferOpenGLES) {
+#ifdef __EMSCRIPTEN__
+			contexts[numContexts].profileMask = SDL_GL_CONTEXT_PROFILE_ES;
+			contexts[numContexts].majorVersion = 3;
+			contexts[numContexts].minorVersion = 0;
+			numContexts++;
+#endif
+
 			contexts[numContexts].profileMask = SDL_GL_CONTEXT_PROFILE_ES;
 			contexts[numContexts].majorVersion = 2;
 			contexts[numContexts].minorVersion = 0;

diff --git a/code/sys/sys_main.c b/code/sys/sys_main.c
@@ -31,6 +31,10 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include <ctype.h>
 #include <errno.h>
 
+#ifdef __EMSCRIPTEN__
+#include <emscripten/emscripten.h>
+#endif
+
 #ifndef DEDICATED
 #ifdef USE_LOCAL_HEADERS
 #include "SDL.h"
@@ -787,9 +791,13 @@ int main(int argc, char **argv) {
 	signal(SIGTERM, Sys_SigHandler);
 	signal(SIGINT, Sys_SigHandler);
 
+#ifdef __EMSCRIPTEN__
+	emscripten_set_main_loop(Com_Frame, 0, 1);
+#else
 	while (1) {
 		Com_Frame();
 	}
+#endif
 
 	return 0;
 }