ADDED: Experimental support for OpenGL ES 3.0 -WIP-

Just added the required flags to request the OpenGL ES 3.0 context but it has not been tested...

2 files changed, 28 insertions, 7 deletions

diff --git a/src/rcore.c b/src/rcore.c
index 7a31b5ed..af65cebf 100644
--- a/src/rcore.c
+++ b/src/rcore.c
@@ -291,6 +291,7 @@
 
 #if defined(PLATFORM_WEB)
     #define GLFW_INCLUDE_ES2            // GLFW3: Enable OpenGL ES 2.0 (translated to WebGL)
+    //#define GLFW_INCLUDE_ES3            // GLFW3: Enable OpenGL ES 3.0 (transalted to WebGL2?)
     #include "GLFW/glfw3.h"             // GLFW3: Windows, OpenGL context and Input management
     #include <sys/time.h>               // Required for: timespec, nanosleep(), select() - POSIX
 
@@ -2451,7 +2452,7 @@ VrStereoConfig LoadVrStereoConfig(VrDeviceInfo device)
 {
     VrStereoConfig config = { 0 };
 
-    if ((rlGetVersion() == RL_OPENGL_33) || (rlGetVersion() == RL_OPENGL_ES_20))
+    if ((rlGetVersion() == RL_OPENGL_33) || (rlGetVersion() >= RL_OPENGL_ES_20))
     {
         // Compute aspect ratio
         float aspect = ((float)device.hResolution*0.5f)/(float)device.vResolution;
@@ -4174,6 +4175,17 @@ static bool InitGraphicsDevice(int width, int height)
         glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_NATIVE_CONTEXT_API);
 #endif
     }
+    else if (rlGetVersion() == RL_OPENGL_ES_30)                 // Request OpenGL ES 3.0 context
+    {
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+        glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
+#if defined(PLATFORM_DESKTOP)
+        glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_EGL_CONTEXT_API);
+#else
+        glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_NATIVE_CONTEXT_API);
+#endif
+    }
 
 #if defined(PLATFORM_DESKTOP)
     // NOTE: GLFW 3.4+ defers initialization of the Joystick subsystem on the first call to any Joystick related functions.
@@ -4543,7 +4555,7 @@ static bool InitGraphicsDevice(int width, int height)
 
     const EGLint framebufferAttribs[] =
     {
-        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,     // Type of context support -> Required on RPI?
+        EGL_RENDERABLE_TYPE, (rlGetVersion() == RL_OPENGL_ES_30)? EGL_OPENGL_ES3_BIT : EGL_OPENGL_ES2_BIT,      // Type of context support
 #if defined(PLATFORM_DRM)
         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,          // Don't use it on Android!
 #endif
diff --git a/src/rlgl.h b/src/rlgl.h
index 85a8ec36..f0bdf3cd 100644
--- a/src/rlgl.h
+++ b/src/rlgl.h
@@ -26,6 +26,7 @@
 *       #define GRAPHICS_API_OPENGL_33
 *       #define GRAPHICS_API_OPENGL_43
 *       #define GRAPHICS_API_OPENGL_ES2
+*       #define GRAPHICS_API_OPENGL_ES3
 *           Use selected OpenGL graphics backend, should be supported by platform
 *           Those preprocessor defines are only used on rlgl module, if OpenGL version is
 *           required by any other module, use rlGetVersion() to check it
@@ -178,6 +179,11 @@
     #define GRAPHICS_API_OPENGL_33
 #endif
 
+// OpenGL ES 3.0 uses OpenGL ES 2.0 functionality (and more)
+#if defined(GRAPHICS_API_OPENGL_ES3)
+    #define GRAPHICS_API_OPENGL_ES2
+#endif
+
 // Support framebuffer objects by default
 // NOTE: Some driver implementation do not support it, despite they should
 #define RLGL_RENDER_TEXTURES_HINT
@@ -382,7 +388,8 @@ typedef enum {
     RL_OPENGL_21,               // OpenGL 2.1 (GLSL 120)
     RL_OPENGL_33,               // OpenGL 3.3 (GLSL 330)
     RL_OPENGL_43,               // OpenGL 4.3 (using GLSL 330)
-    RL_OPENGL_ES_20             // OpenGL ES 2.0 (GLSL 100)
+    RL_OPENGL_ES_20,            // OpenGL ES 2.0 (GLSL 100)
+    RL_OPENGL_ES_30             // OpenGL ES 3.0 (GLSL 300 es)    
 } rlGlVersion;
 
 // Trace log level
@@ -2389,15 +2396,17 @@ int rlGetVersion(void)
 #endif
 #if defined(GRAPHICS_API_OPENGL_21)
     glVersion = RL_OPENGL_21;
+#elif defined(GRAPHICS_API_OPENGL_43)
+    glVersion = RL_OPENGL_43;
 #elif defined(GRAPHICS_API_OPENGL_33)
     glVersion = RL_OPENGL_33;
 #endif
-#if defined(GRAPHICS_API_OPENGL_43)
-    glVersion = RL_OPENGL_43;
-#endif
-#if defined(GRAPHICS_API_OPENGL_ES2)
+#if defined(GRAPHICS_API_OPENGL_ES3)
+    glVersion = RL_OPENGL_ES_30;
+#elif defined(GRAPHICS_API_OPENGL_ES2)
     glVersion = RL_OPENGL_ES_20;
 #endif
+
     return glVersion;
 }