irrlicht/source/Irrlicht/OpenGLES2/Driver.cpp

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// Copyright (C) 2023 Vitaliy Lobachevskiy
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in Irrlicht.h
#include "Driver.h"
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#include <cassert>
#include <CColorConverter.h>
namespace irr {
namespace video {
E_DRIVER_TYPE COpenGLES2Driver::getDriverType() const {
return EDT_OGLES2;
}
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OpenGLVersion COpenGLES2Driver::getVersionFromOpenGL() const {
auto version_string = reinterpret_cast<const char *>(glGetString(GL_VERSION));
int major, minor;
if (sscanf(version_string, "OpenGL ES %d.%d", &major, &minor) != 2) {
os::Printer::log("Failed to parse OpenGL ES version string", version_string, ELL_ERROR);
return {OpenGLSpec::ES, 0, 0, 0};
}
return {OpenGLSpec::ES, (u8)major, (u8)minor, 0};
}
void COpenGLES2Driver::initFeatures() {
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assert (Version.Spec == OpenGLSpec::ES);
assert (Version.Major >= 2);
if (Version.Major >= 3)
initExtensionsNew();
else
initExtensionsOld();
if (Version.Major >= 3) {
// NOTE floating-point formats may not be suitable for render targets.
TextureFormats[ECF_A1R5G5B5] = {GL_RGB5_A1, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, CColorConverter::convert_A1R5G5B5toR5G5B5A1};
TextureFormats[ECF_R5G6B5] = {GL_RGB565, GL_RGB, GL_UNSIGNED_SHORT_5_6_5};
TextureFormats[ECF_R8G8B8] = {GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE};
TextureFormats[ECF_A8R8G8B8] = {GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, CColorConverter::convert_A8R8G8B8toA8B8G8R8};
TextureFormats[ECF_R16F] = {GL_R16F, GL_RED, GL_HALF_FLOAT};
TextureFormats[ECF_G16R16F] = {GL_RG16F, GL_RG, GL_HALF_FLOAT};
TextureFormats[ECF_A16B16G16R16F] = {GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT};
TextureFormats[ECF_R32F] = {GL_R32F, GL_RED, GL_FLOAT};
TextureFormats[ECF_G32R32F] = {GL_RG32F, GL_RG, GL_FLOAT};
TextureFormats[ECF_A32B32G32R32F] = {GL_RGBA32F, GL_RGBA, GL_FLOAT};
TextureFormats[ECF_R8] = {GL_R8, GL_RED, GL_UNSIGNED_BYTE};
TextureFormats[ECF_R8G8] = {GL_RG8, GL_RG, GL_UNSIGNED_BYTE};
TextureFormats[ECF_D16] = {GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT};
TextureFormats[ECF_D24S8] = {GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8};
if (FeatureAvailable[IRR_GL_EXT_texture_format_BGRA8888])
TextureFormats[ECF_A8R8G8B8] = {GL_RGBA, GL_BGRA, GL_UNSIGNED_BYTE};
else if (FeatureAvailable[IRR_GL_APPLE_texture_format_BGRA8888])
TextureFormats[ECF_A8R8G8B8] = {GL_BGRA, GL_BGRA, GL_UNSIGNED_BYTE};
if (FeatureAvailable[IRR_GL_OES_depth32])
TextureFormats[ECF_D32] = {GL_DEPTH_COMPONENT32, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT};
} else {
// NOTE These are *texture* formats. They may or may not be suitable
// for render targets. The specs only talks on *sized* formats for the
// latter but forbids creating textures with sized internal formats,
// reserving them for renderbuffers.
static const GLenum HALF_FLOAT_OES = 0x8D61; // not equal to GL_HALF_FLOAT
TextureFormats[ECF_A1R5G5B5] = {GL_RGBA, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, CColorConverter::convert_A1R5G5B5toR5G5B5A1};
TextureFormats[ECF_R5G6B5] = {GL_RGB, GL_RGB, GL_UNSIGNED_SHORT_5_6_5};
TextureFormats[ECF_R8G8B8] = {GL_RGB, GL_RGB, GL_UNSIGNED_BYTE};
TextureFormats[ECF_A8R8G8B8] = {GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, CColorConverter::convert_A8R8G8B8toA8B8G8R8};
if (FeatureAvailable[IRR_GL_EXT_texture_format_BGRA8888])
TextureFormats[ECF_A8R8G8B8] = {GL_RGBA, GL_BGRA, GL_UNSIGNED_BYTE};
else if (FeatureAvailable[IRR_GL_APPLE_texture_format_BGRA8888])
TextureFormats[ECF_A8R8G8B8] = {GL_BGRA, GL_BGRA, GL_UNSIGNED_BYTE};
if (FeatureAvailable[IRR_GL_OES_texture_half_float]) {
TextureFormats[ECF_A16B16G16R16F] = {GL_RGBA, GL_RGBA, HALF_FLOAT_OES};
}
if (FeatureAvailable[IRR_GL_OES_texture_float]) {
TextureFormats[ECF_A32B32G32R32F] = {GL_RGBA, GL_RGBA, GL_FLOAT};
}
if (FeatureAvailable[IRR_GL_EXT_texture_rg]) {
TextureFormats[ECF_R8] = {GL_RED, GL_RED, GL_UNSIGNED_BYTE};
TextureFormats[ECF_R8G8] = {GL_RG, GL_RG, GL_UNSIGNED_BYTE};
if (FeatureAvailable[IRR_GL_OES_texture_half_float]) {
TextureFormats[ECF_R16F] = {GL_RED, GL_RED, HALF_FLOAT_OES};
TextureFormats[ECF_G16R16F] = {GL_RG, GL_RG, HALF_FLOAT_OES};
}
if (FeatureAvailable[IRR_GL_OES_texture_float]) {
TextureFormats[ECF_R32F] = {GL_RED, GL_RED, GL_FLOAT};
TextureFormats[ECF_G32R32F] = {GL_RG, GL_RG, GL_FLOAT};
}
}
if (FeatureAvailable[IRR_GL_OES_depth_texture]) {
TextureFormats[ECF_D16] = {GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT};
if (FeatureAvailable[IRR_GL_OES_depth32])
TextureFormats[ECF_D32] = {GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT};
if (FeatureAvailable[IRR_GL_OES_packed_depth_stencil])
TextureFormats[ECF_D24S8] = {GL_DEPTH_STENCIL, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8};
}
}
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const bool MRTSupported = Version.Major >= 3 || queryExtension("GL_EXT_draw_buffers");
AnisotropicFilterSupported = queryExtension("GL_EXT_texture_filter_anisotropic");
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BlendMinMaxSupported = (Version.Major >= 3) || FeatureAvailable[IRR_GL_EXT_blend_minmax];
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const bool TextureLODBiasSupported = queryExtension("GL_EXT_texture_lod_bias");
// COGLESCoreExtensionHandler::Feature
static_assert(MATERIAL_MAX_TEXTURES <= 8, "Only up to 8 textures are guaranteed");
Feature.BlendOperation = true;
Feature.ColorAttachment = 1;
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if (MRTSupported)
Feature.ColorAttachment = GetInteger(GL_MAX_COLOR_ATTACHMENTS);
Feature.MaxTextureUnits = MATERIAL_MAX_TEXTURES;
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if (MRTSupported)
Feature.MultipleRenderTarget = GetInteger(GL_MAX_DRAW_BUFFERS);
// COGLESCoreExtensionHandler
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if (AnisotropicFilterSupported)
MaxAnisotropy = GetInteger(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
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if (Version.Major >= 3 || queryExtension("GL_EXT_draw_range_elements"))
MaxIndices = GetInteger(GL_MAX_ELEMENTS_INDICES);
MaxTextureSize = GetInteger(GL_MAX_TEXTURE_SIZE);
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if (TextureLODBiasSupported)
glGetFloatv(GL_MAX_TEXTURE_LOD_BIAS, &MaxTextureLODBias);
glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, DimAliasedLine); // NOTE: this is not in the OpenGL ES 2.0 spec...
glGetFloatv(GL_ALIASED_POINT_SIZE_RANGE, DimAliasedPoint);
}
IVideoDriver* createOGLES2Driver(const SIrrlichtCreationParameters& params, io::IFileSystem* io, IContextManager* contextManager)
{
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os::Printer::log("Using COpenGLES2Driver", ELL_INFORMATION);
COpenGLES2Driver* driver = new COpenGLES2Driver(params, io, contextManager);
driver->genericDriverInit(params.WindowSize, params.Stencilbuffer); // don't call in constructor, it uses virtual function calls of driver
return driver;
}
}
}