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