irrlicht/source/Irrlicht/COGLESCoreExtensionHandler.h

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// Copyright (C) 2017 Michael Zeilfelder
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in Irrlicht.h
#pragma once
// Can be included from different ES versions
// (this is also the reason why this file is header-only as correct OGL ES headers have to be included first)
#include "irrMath.h"
#include "COpenGLCoreFeature.h"
namespace irr
{
namespace video
{
class COGLESCoreExtensionHandler
{
public:
// Enums used internally to check for ES extensions quickly.
// We buffer all extensions on start once in an array.
// All OpenGL ES versions share the same extensions (WebGL adds it's own extensions on top of ES2)
enum EOGLESFeatures
{
// If you update this enum also update the corresponding OGLESFeatureStrings string-array
IRR_GL_APPLE_texture_2D_limited_npot,
IRR_GL_APPLE_texture_format_BGRA8888,
IRR_GL_EXT_blend_minmax,
IRR_GL_EXT_read_format_bgra,
IRR_GL_EXT_texture_filter_anisotropic,
IRR_GL_EXT_texture_format_BGRA8888,
IRR_GL_EXT_texture_lod_bias,
IRR_GL_EXT_texture_rg,
IRR_GL_IMG_read_format,
IRR_GL_IMG_texture_format_BGRA8888,
IRR_GL_IMG_user_clip_plane,
IRR_GL_OES_blend_func_separate,
IRR_GL_OES_blend_subtract,
IRR_GL_OES_depth_texture,
IRR_GL_OES_depth24,
IRR_GL_OES_depth32,
IRR_GL_OES_element_index_uint,
IRR_GL_OES_framebuffer_object,
IRR_GL_OES_packed_depth_stencil,
IRR_GL_OES_point_size_array,
IRR_GL_OES_point_sprite,
IRR_GL_OES_read_format,
IRR_GL_OES_stencil_wrap,
IRR_GL_OES_texture_float,
IRR_GL_OES_texture_half_float,
IRR_GL_OES_texture_mirrored_repeat,
IRR_GL_OES_texture_npot,
IRR_OGLES_Feature_Count
};
COGLESCoreExtensionHandler() :
Version(0), MaxAnisotropy(1), MaxIndices(0xffff),
MaxTextureSize(1), MaxTextureLODBias(0.f), StencilBuffer(false)
{
for (u32 i = 0; i < IRR_OGLES_Feature_Count; ++i)
FeatureAvailable[i] = false;
DimAliasedLine[0] = 1.f;
DimAliasedLine[1] = 1.f;
DimAliasedPoint[0] = 1.f;
DimAliasedPoint[1] = 1.f;
}
virtual ~COGLESCoreExtensionHandler() {}
const COpenGLCoreFeature &getFeature() const
{
return Feature;
}
void dump() const
{
for (u32 i = 0; i < IRR_OGLES_Feature_Count; ++i)
os::Printer::log(getFeatureString(i), FeatureAvailable[i] ? " true" : " false");
}
bool queryGLESFeature(EOGLESFeatures feature) const
{
return FeatureAvailable[feature];
}
protected:
const char *getFeatureString(size_t index) const
{
// One for each EOGLESFeatures
static const char *const OGLESFeatureStrings[IRR_OGLES_Feature_Count] =
{
"GL_APPLE_texture_2D_limited_npot",
"GL_APPLE_texture_format_BGRA8888",
"GL_EXT_blend_minmax",
"GL_EXT_read_format_bgra",
"GL_EXT_texture_filter_anisotropic",
"GL_EXT_texture_format_BGRA8888",
"GL_EXT_texture_lod_bias",
"GL_EXT_texture_rg",
"GL_IMG_read_format",
"GL_IMG_texture_format_BGRA8888",
"GL_IMG_user_clip_plane",
"GL_OES_blend_func_separate",
"GL_OES_blend_subtract",
"GL_OES_depth_texture",
"GL_OES_depth24",
"GL_OES_depth32",
"GL_OES_element_index_uint",
"GL_OES_framebuffer_object",
"GL_OES_packed_depth_stencil",
"GL_OES_point_size_array",
"GL_OES_point_sprite",
"GL_OES_read_format",
"GL_OES_stencil_wrap",
"GL_OES_texture_float",
"GL_OES_texture_half_float",
"GL_OES_texture_mirrored_repeat",
"GL_OES_texture_npot",
};
return OGLESFeatureStrings[index];
}
void getGLVersion()
{
Version = 0;
s32 multiplier = 100;
core::stringc version(glGetString(GL_VERSION));
for (u32 i = 0; i < version.size(); ++i) {
if (version[i] >= '0' && version[i] <= '9') {
if (multiplier > 1) {
Version += static_cast<u16>(core::floor32(atof(&(version[i]))) * multiplier);
multiplier /= 10;
} else {
break;
}
}
}
}
void getGLExtensions()
{
core::stringc extensions = glGetString(GL_EXTENSIONS);
os::Printer::log(extensions.c_str());
const u32 size = extensions.size() + 1;
c8 *str = new c8[size];
strncpy(str, extensions.c_str(), extensions.size());
str[extensions.size()] = ' ';
c8 *p = str;
for (u32 i = 0; i < size; ++i) {
if (str[i] == ' ') {
str[i] = 0;
if (*p)
for (size_t j = 0; j < IRR_OGLES_Feature_Count; ++j) {
if (!strcmp(getFeatureString(j), p)) {
FeatureAvailable[j] = true;
break;
}
}
p = p + strlen(p) + 1;
}
}
delete[] str;
}
COpenGLCoreFeature Feature;
u16 Version;
u8 MaxAnisotropy;
u32 MaxIndices;
u32 MaxTextureSize;
f32 MaxTextureLODBias;
//! Minimal and maximal supported thickness for lines without smoothing
float DimAliasedLine[2];
//! Minimal and maximal supported thickness for points without smoothing
float DimAliasedPoint[2];
bool StencilBuffer;
bool FeatureAvailable[IRR_OGLES_Feature_Count];
};
}
}