irrlicht/source/Irrlicht/OpenGLES2/Driver.cpp
2023-04-23 09:48:04 +02:00

69 lines
2.6 KiB
C++

// 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"
#include <cassert>
namespace irr {
namespace video {
E_DRIVER_TYPE COpenGLES2Driver::getDriverType() const {
return EDT_OGLES2;
}
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() {
assert (Version.Spec == OpenGLSpec::ES);
assert (Version.Major >= 2);
if (Version.Major >= 3)
initExtensionsNew();
else
initExtensionsOld();
const bool MRTSupported = Version.Major >= 3 || queryExtension("GL_EXT_draw_buffers");
AnisotropicFilterSupported = queryExtension("GL_EXT_texture_filter_anisotropic");
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;
if (MRTSupported)
Feature.ColorAttachment = GetInteger(GL_MAX_COLOR_ATTACHMENTS);
Feature.MaxTextureUnits = MATERIAL_MAX_TEXTURES;
if (MRTSupported)
Feature.MultipleRenderTarget = GetInteger(GL_MAX_DRAW_BUFFERS);
// COGLESCoreExtensionHandler
if (AnisotropicFilterSupported)
MaxAnisotropy = GetInteger(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
if (Version.Major >= 3 || queryExtension("GL_EXT_draw_range_elements"))
MaxIndices = GetInteger(GL_MAX_ELEMENTS_INDICES);
MaxTextureSize = GetInteger(GL_MAX_TEXTURE_SIZE);
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)
{
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;
}
}
}