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9b6a399011
- Actually it's MSAA I think, or perhaps the terms are equivalent - I've made it fit into the existing Irrlicht architecture, but that has resulted in code duplication compared to my original "hacky" approach - OpenGL 3.2+ and OpenGL ES 3.1+ are supported - EDT_OPENGL3 is not required, EDT_OPENGL works too - Helpful tutorial: https://learnopengl.com/Advanced-OpenGL/Anti-Aliasing, section "Off-screen MSAA" - This may be rough around the edges, but in general it works
101 lines
4.3 KiB
C++
101 lines
4.3 KiB
C++
// Copyright (C) 2023 Vitaliy Lobachevskiy
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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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#include "Driver.h"
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#include <cassert>
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#include <stdexcept>
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#include "mt_opengl.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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E_DRIVER_TYPE COpenGL3Driver::getDriverType() const
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{
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return EDT_OPENGL3;
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}
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OpenGLVersion COpenGL3Driver::getVersionFromOpenGL() const
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{
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GLint major = 0, minor = 0, profile = 0;
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GL.GetIntegerv(GL_MAJOR_VERSION, &major);
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GL.GetIntegerv(GL_MINOR_VERSION, &minor);
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GL.GetIntegerv(GL_CONTEXT_PROFILE_MASK, &profile);
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// The spec is clear a context can’t be both core and compatibility at the same time.
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// However, the returned value is a mask. Ask Khronos why. -- numzero
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if (profile & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT)
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return {OpenGLSpec::Compat, (u8)major, (u8)minor, 0};
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if (profile & GL_CONTEXT_CORE_PROFILE_BIT)
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return {OpenGLSpec::Core, (u8)major, (u8)minor, 0};
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os::Printer::log("Got unrecognized OpenGL profile", ELL_ERROR);
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return {OpenGLSpec::Core, (u8)major, (u8)minor, 0};
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}
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void COpenGL3Driver::initFeatures()
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{
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if (Version.Spec != OpenGLSpec::Compat) {
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auto msg = "OpenGL 3 driver requires Compatibility context";
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os::Printer::log(msg, ELL_ERROR);
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throw std::runtime_error(msg);
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}
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if (!isVersionAtLeast(3, 2)) {
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auto msg = "OpenGL 3 driver requires OpenGL >= 3.2";
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os::Printer::log(msg, ELL_ERROR);
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throw std::runtime_error(msg);
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}
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initExtensions();
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TextureFormats[ECF_A1R5G5B5] = {GL_RGB5_A1, GL_BGRA, GL_UNSIGNED_SHORT_1_5_5_5_REV}; // WARNING: may not be renderable
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TextureFormats[ECF_R5G6B5] = {GL_RGB, GL_RGB, GL_UNSIGNED_SHORT_5_6_5}; // GL_RGB565 is an extension until 4.1
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TextureFormats[ECF_R8G8B8] = {GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE}; // WARNING: may not be renderable
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// FIXME: shouldn't this simply be GL_UNSIGNED_BYTE?
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TextureFormats[ECF_A8R8G8B8] = {GL_RGBA8, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV};
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TextureFormats[ECF_R16F] = {GL_R16F, GL_RED, GL_HALF_FLOAT};
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TextureFormats[ECF_G16R16F] = {GL_RG16F, GL_RG, GL_HALF_FLOAT};
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TextureFormats[ECF_A16B16G16R16F] = {GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT};
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TextureFormats[ECF_R32F] = {GL_R32F, GL_RED, GL_FLOAT};
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TextureFormats[ECF_G32R32F] = {GL_RG32F, GL_RG, GL_FLOAT};
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TextureFormats[ECF_A32B32G32R32F] = {GL_RGBA32F, GL_RGBA, GL_FLOAT};
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TextureFormats[ECF_R8] = {GL_R8, GL_RED, GL_UNSIGNED_BYTE};
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TextureFormats[ECF_R8G8] = {GL_RG8, GL_RG, GL_UNSIGNED_BYTE};
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TextureFormats[ECF_R16] = {GL_R16, GL_RED, GL_UNSIGNED_SHORT};
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TextureFormats[ECF_R16G16] = {GL_RG16, GL_RG, GL_UNSIGNED_SHORT};
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TextureFormats[ECF_D16] = {GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT};
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TextureFormats[ECF_D24] = {GL_DEPTH_COMPONENT24, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT};
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TextureFormats[ECF_D32] = {GL_DEPTH_COMPONENT32, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT}; // WARNING: may not be renderable (?!)
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TextureFormats[ECF_D24S8] = {GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8};
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AnisotropicFilterSupported = isVersionAtLeast(4, 6) || queryExtension("GL_ARB_texture_filter_anisotropic") || queryExtension("GL_EXT_texture_filter_anisotropic");
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BlendMinMaxSupported = true;
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TextureMultisampleSupported = true;
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// COGLESCoreExtensionHandler::Feature
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static_assert(MATERIAL_MAX_TEXTURES <= 16, "Only up to 16 textures are guaranteed");
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Feature.BlendOperation = true;
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Feature.ColorAttachment = GetInteger(GL_MAX_COLOR_ATTACHMENTS);
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Feature.MaxTextureUnits = MATERIAL_MAX_TEXTURES;
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Feature.MultipleRenderTarget = GetInteger(GL_MAX_DRAW_BUFFERS);
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// COGLESCoreExtensionHandler
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if (AnisotropicFilterSupported)
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MaxAnisotropy = GetInteger(GL.MAX_TEXTURE_MAX_ANISOTROPY);
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MaxIndices = GetInteger(GL_MAX_ELEMENTS_INDICES);
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MaxTextureSize = GetInteger(GL_MAX_TEXTURE_SIZE);
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GL.GetFloatv(GL_MAX_TEXTURE_LOD_BIAS, &MaxTextureLODBias);
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GL.GetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, DimAliasedLine);
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DimAliasedPoint[0] = 1.0f;
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DimAliasedPoint[1] = 1.0f;
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}
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IVideoDriver *createOpenGL3Driver(const SIrrlichtCreationParameters ¶ms, io::IFileSystem *io, IContextManager *contextManager)
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{
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os::Printer::log("Using COpenGL3Driver", ELL_INFORMATION);
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COpenGL3Driver *driver = new COpenGL3Driver(params, io, contextManager);
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driver->genericDriverInit(params.WindowSize, params.Stencilbuffer); // don't call in constructor, it uses virtual function calls of driver
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return driver;
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}
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}
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}
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