Part of runtime flags that kick in different things on our GL implementaton

GraphicsCapsGLES.h

int	maxAASamplesConst;	// gles2 img/apple/ext extensions all use different constants (facepalm)
int	halfConst;		// gles2 and gles3 have different constants for half float type
int	texSRGBAConst;		// gles2 (without 'internal format' ext) and gles3 have different constants for SRGB RGBA texture type
int	texSRGBConst;		// gles2 (without 'internal format' ext) and gles3 have different constants for SRGB RGB texture type
int	etcFormatConst;		// gles2/gles3 have different standard etc formats

bool	isPvrGpu;
bool	isMaliGpu;
bool	isAdrenoGpu;
bool	isTegraGpu;
bool	isIntelGpu;
bool	isAMDGpu;

bool	hasSlowAlphaTest;		// alpha test might be slow because it kills coarse z cull
bool	useDiscardToAvoidRestore;	// if discard/invalidate are preferred to avoid restore (usually means clear is fullscreen quad)
bool	useClearToAvoidRestore;		// if clear is preferred to avoid restore
bool	hasPolygonOffsetBug;		// Need to increase polygon offset by a large factor

bool	favorUniformBuffer; 	// If false, will avoid using uniform buffers
bool	requireDrawBufferNone;
bool	enforceFullFormat;

// old gles2 adreno drivers fails to re-patch vfetch instructions
// if shader stays the same, but vertex layout has been changed
// will result in forced program change on draw call
bool	buggyVFetchPatching;

// if we should force highp as default precision
// on Tegra there is a bug that sometimes results in samplers not being reported (workaround)
// on Adreno (N4 at least) there is a bug that sometimes results in program link crash (workaround)
bool	useHighpDefaultFSPrec;

// older imgtec android shader compiler have borken GL_EXT_shader_texture_lod
// it insists on textureCubeLod instead of textureCubeLodEXT and textureCubeGradARB instead of textureCubeGradEXT
// they told us it was fixed in reference driver and backported to driver ver 1.10@2570425
// on the other hand we better off not trusting driver string, so we recheck the case on all pvr androids
bool	buggyTexCubeLodGrad;

//doesn't like to have the same buffer bound to the same binding point with both BindBuffer and BindBufferBase (below)
bool	buggyBindBuffer;

// on some adrenos (gles2) there is a bug in texture upload code, which usually hits font rendering
// it seems there is some optimization inside a driver when you have several uploads one after another
// and it is totally buggy
// as a workaround we just call glFinish before the first texture upload of a frame
bool	buggyTextureUploadSynchronization;

// In some implementations glColorMask(0, 0, 0, 0) does not work in all situations.
// E.g. on PowerVR SGX 540 when 'discard' is used in the shader.
bool	buggyDisableColorWrite;

// Adreno 3xx's crash if they see a const float array in shader that's actually used. Silently fail to compile those shaders.
bool	buggyShaderConstArray;

// BlackBerry adreno needs an extra call of this
bool	requirePrepareFramebuffer;

bool buggyTextureBothColorAndDepth;	// Can't have render target where both color & depth will be sampled as textures
bool buggyShadowMapBilinearSampling;	// Never use hardware bilinear PCF on shadow maps due to bugs
bool buggyDepthBlitWithSRGBEnabled;	// depth blit with FRAMEBUFFER_SRGB enabled is buggy