From cd21abe50fbd26d85d8f49367a52e907f071148b Mon Sep 17 00:00:00 2001
From: BreadFish64 <mohror64@gmail.com>
Date: Wed, 30 Jan 2019 14:11:39 -0600
Subject: [PATCH] sdl: add GLES support

---
 src/citra/config.cpp                     |  1 +
 src/citra/default_ini.h                  |  4 ++++
 src/citra/emu_window/emu_window_sdl2.cpp | 13 ++++++++++---
 src/core/settings.cpp                    |  1 +
 src/core/settings.h                      |  1 +
 5 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/citra/config.cpp b/src/citra/config.cpp
index b3794f2cc..e6eea37cc 100644
--- a/src/citra/config.cpp
+++ b/src/citra/config.cpp
@@ -105,6 +105,7 @@ void Config::ReadValues() {
     Settings::values.use_cpu_jit = sdl2_config->GetBoolean("Core", "use_cpu_jit", true);
 
     // Renderer
+    Settings::values.use_gles = sdl2_config->GetBoolean("Renderer", "use_gles", false);
     Settings::values.use_hw_renderer = sdl2_config->GetBoolean("Renderer", "use_hw_renderer", true);
 #ifdef __APPLE__
     // Hardware shader is broken on macos thanks to poor drivers.
diff --git a/src/citra/default_ini.h b/src/citra/default_ini.h
index 35edcbaaa..37c12a374 100644
--- a/src/citra/default_ini.h
+++ b/src/citra/default_ini.h
@@ -92,6 +92,10 @@ udp_pad_index=
 use_cpu_jit =
 
 [Renderer]
+# Whether to render using GLES or OpenGL
+# 0 (default): OpenGL, 1: GLES
+use_gles =
+
 # Whether to use software or hardware rendering.
 # 0: Software, 1 (default): Hardware
 use_hw_renderer =
diff --git a/src/citra/emu_window/emu_window_sdl2.cpp b/src/citra/emu_window/emu_window_sdl2.cpp
index 2da55bd29..14f440f34 100644
--- a/src/citra/emu_window/emu_window_sdl2.cpp
+++ b/src/citra/emu_window/emu_window_sdl2.cpp
@@ -122,8 +122,13 @@ EmuWindow_SDL2::EmuWindow_SDL2(bool fullscreen) {
     SDL_SetMainReady();
 
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    if (Settings::values.use_gles) {
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+    } else {
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    }
     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
     SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
@@ -155,7 +160,9 @@ EmuWindow_SDL2::EmuWindow_SDL2(bool fullscreen) {
         exit(1);
     }
 
-    if (!gladLoadGLLoader(static_cast<GLADloadproc>(SDL_GL_GetProcAddress))) {
+    auto gl_load_func = Settings::values.use_gles ? gladLoadGLES2Loader : gladLoadGLLoader;
+
+    if (!gl_load_func(static_cast<GLADloadproc>(SDL_GL_GetProcAddress))) {
         LOG_CRITICAL(Frontend, "Failed to initialize GL functions: {}", SDL_GetError());
         exit(1);
     }
diff --git a/src/core/settings.cpp b/src/core/settings.cpp
index 88c88dc8c..4b80e3436 100644
--- a/src/core/settings.cpp
+++ b/src/core/settings.cpp
@@ -67,6 +67,7 @@ void LogSetting(const std::string& name, const T& value) {
 void LogSettings() {
     LOG_INFO(Config, "Citra Configuration:");
     LogSetting("Core_UseCpuJit", Settings::values.use_cpu_jit);
+    LogSetting("Renderer_UseGLES", Settings::values.use_gles);
     LogSetting("Renderer_UseHwRenderer", Settings::values.use_hw_renderer);
     LogSetting("Renderer_UseHwShader", Settings::values.use_hw_shader);
     LogSetting("Renderer_ShadersAccurateGs", Settings::values.shaders_accurate_gs);
diff --git a/src/core/settings.h b/src/core/settings.h
index d1de56349..cea502693 100644
--- a/src/core/settings.h
+++ b/src/core/settings.h
@@ -130,6 +130,7 @@ struct Values {
     u64 init_time;
 
     // Renderer
+    bool use_gles;
     bool use_hw_renderer;
     bool use_hw_shader;
     bool shaders_accurate_gs;