Add initial support for GLSL ES 3.10.

GLSL ES 3.10 adds implicit support for the binding layout qualifier that we use.
Changes our GLSL version enums to bit values so we can check for both ES versions easily.

Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2
 // Refer to the license.txt file included.
 
+#include <string>
+
 #include "Common/MathUtil.h"
 
 #include "VideoBackends/OGL/ProgramShaderCache.h"
@@ -36,13 +38,33 @@ UidChecker<VertexShaderUid,VertexShaderCode> ProgramShaderCache::vertex_uid_chec
 
 static char s_glsl_header[1024] = "";
 
+std::string GetGLSLVersionString()
+{
+	GLSL_VERSION v = g_ogl_config.eSupportedGLSLVersion;
+	switch(v)
+	{
+		case GLSLES_300:
+			return "#version 300 es";
+		case GLSLES_310:
+			return "#version 310 es";
+		case GLSL_130:
+			return "#version 130";
+		case GLSL_140:
+			return "#version 140";
+		case GLSL_150:
+			return "#version 150";
+	}
+	// Shouldn't ever hit this
+	return "#version ERROR";
+}
+
 void SHADER::SetProgramVariables()
 {
 	// glsl shader must be bind to set samplers
 	Bind();
 
 	// Bind UBO
-	if (!g_ActiveConfig.backend_info.bSupportShadingLanguage420pack)
+	if (!g_ActiveConfig.backend_info.bSupportsBindingLayout)
 	{
 		GLint PSBlock_id = glGetUniformBlockIndex(glprogid, "PSBlock");
 		GLint VSBlock_id = glGetUniformBlockIndex(glprogid, "VSBlock");
@@ -455,7 +477,7 @@ void ProgramShaderCache::CreateHeader ( void )
 		"%s\n" // early-z
 		"%s\n" // 420pack
 
-		// Precision defines for GLSLES3
+		// Precision defines for GLSL ES
 		"%s\n"
 		"%s\n"
 
@@ -478,13 +500,13 @@ void ProgramShaderCache::CreateHeader ( void )
 		"%s\n" // replace textureSize as constant
 		"%s\n" // wipe out all centroid usages
 
-		, v==GLSLES3 ? "#version 300 es" : v==GLSL_130 ? "#version 130" : v==GLSL_140 ? "#version 140" : "#version 150"
+		, GetGLSLVersionString().c_str()
 		, v<GLSL_140 ? "#extension GL_ARB_uniform_buffer_object : enable" : ""
 		, g_ActiveConfig.backend_info.bSupportsEarlyZ ? "#extension GL_ARB_shader_image_load_store : enable" : ""
-		, g_ActiveConfig.backend_info.bSupportShadingLanguage420pack ? "#extension GL_ARB_shading_language_420pack : enable" : ""
+		, (g_ActiveConfig.backend_info.bSupportsBindingLayout && v < GLSLES_310) ? "#extension GL_ARB_shading_language_420pack : enable" : ""
 
-		, v==GLSLES3 ? "precision highp float;" : ""
+		, v>=GLSLES_300 ? "precision highp float;" : ""
-		, v==GLSLES3 ? "precision highp int;" : ""
+		, v>=GLSLES_300 ? "precision highp int;" : ""
 
 		, DriverDetails::HasBug(DriverDetails::BUG_BROKENTEXTURESIZE) ? "#define textureSize(x, y) ivec2(1, 1)" : ""
 		, DriverDetails::HasBug(DriverDetails::BUG_BROKENCENTROID) ? "#define centroid" : ""

Source/Core/VideoBackends/OGL/Render.cpp

@@ -459,7 +459,10 @@ Renderer::Renderer()
 	g_Config.backend_info.bSupportsPrimitiveRestart = !DriverDetails::HasBug(DriverDetails::BUG_PRIMITIVERESTART) &&
 				((GLExtensions::Version() >= 310) || GLExtensions::Supports("GL_NV_primitive_restart"));
 	g_Config.backend_info.bSupportsEarlyZ = GLExtensions::Supports("GL_ARB_shader_image_load_store");
-	g_Config.backend_info.bSupportShadingLanguage420pack = GLExtensions::Supports("GL_ARB_shading_language_420pack");
+
+	// Desktop OpenGL supports the binding layout if it supports 420pack
+	// OpenGL ES 3.1 supports it implicitly without an extension
+	g_Config.backend_info.bSupportsBindingLayout = GLExtensions::Supports("GL_ARB_shading_language_420pack");
 
 	g_ogl_config.bSupportsGLSLCache = GLExtensions::Supports("GL_ARB_get_program_binary");
 	g_ogl_config.bSupportsGLPinnedMemory = GLExtensions::Supports("GL_AMD_pinned_memory");
@@ -472,7 +475,17 @@ Renderer::Renderer()
 	g_ogl_config.bSupportViewportFloat = GLExtensions::Supports("GL_ARB_viewport_array");
 
 	if (GLInterface->GetMode() == GLInterfaceMode::MODE_OPENGLES3)
-		g_ogl_config.eSupportedGLSLVersion = GLSLES3;
+	{
+		if (strstr(g_ogl_config.glsl_version, "3.00"))
+		{
+			g_ogl_config.eSupportedGLSLVersion = GLSLES_300;
+		}
+		else
+		{
+			g_ogl_config.eSupportedGLSLVersion = GLSLES_310;
+			g_Config.backend_info.bSupportsBindingLayout = true;
+		}
+	}
 	else
 	{
 		if (strstr(g_ogl_config.glsl_version, "1.00") || strstr(g_ogl_config.glsl_version, "1.10") || strstr(g_ogl_config.glsl_version, "1.20"))

Source/Core/VideoBackends/OGL/Render.h

@@ -12,7 +12,8 @@ enum GLSL_VERSION {
 	GLSL_130,
 	GLSL_140,
 	GLSL_150,  // and above
-	GLSLES3
+	GLSLES_300,  // GLES 3.0
+	GLSLES_310, // GLES 3.1
 };
 
 // ogl-only config, so not in VideoConfig.h

Source/Core/VideoCommon/PixelShaderGen.cpp

@@ -223,7 +223,7 @@ static inline void GeneratePixelShader(T& out, DSTALPHA_MODE dstAlphaMode, API_T
 	out.Write("\n");
 
 	if (ApiType == API_OPENGL)
-		out.Write("layout(std140%s) uniform PSBlock {\n", g_ActiveConfig.backend_info.bSupportShadingLanguage420pack ? ", binding = 1" : "");
+		out.Write("layout(std140%s) uniform PSBlock {\n", g_ActiveConfig.backend_info.bSupportsBindingLayout ? ", binding = 1" : "");
 
 	DeclareUniform(out, ApiType, C_COLORS, "int4", I_COLORS"[4]");
 	DeclareUniform(out, ApiType, C_KCOLORS, "int4", I_KCOLORS"[4]");

Source/Core/VideoCommon/VertexShaderGen.cpp

@@ -83,7 +83,7 @@ static inline void GenerateVertexShader(T& out, u32 components, API_TYPE api_typ
 
 	// uniforms
 	if (api_type == API_OPENGL)
-		out.Write("layout(std140%s) uniform VSBlock {\n", g_ActiveConfig.backend_info.bSupportShadingLanguage420pack ? ", binding = 2" : "");
+		out.Write("layout(std140%s) uniform VSBlock {\n", g_ActiveConfig.backend_info.bSupportsBindingLayout ? ", binding = 2" : "");
 
 	DeclareUniform(out, api_type, C_POSNORMALMATRIX, "float4", I_POSNORMALMATRIX"[6]");
 	DeclareUniform(out, api_type, C_PROJECTION, "float4", I_PROJECTION"[4]");

Source/Core/VideoCommon/VideoConfig.h

@@ -152,7 +152,7 @@ struct VideoConfig final
 		bool bSupportsSeparateAlphaFunction;
 		bool bSupportsOversizedViewports;
 		bool bSupportsEarlyZ; // needed by PixelShaderGen, so must stay in VideoCommon
-		bool bSupportShadingLanguage420pack; // needed by ShaderGen, so must stay in VideoCommon
+		bool bSupportsBindingLayout; // Needed by ShaderGen, so must stay in VideoCommon
 	} backend_info;
 
 	// Utility