mirror of https://github.com/mosra/magnum.git
Vladimír Vondruš
8 years ago
24 changed files with 1531 additions and 821 deletions
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/*
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 |
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Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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#include "Magnum/DefaultFramebuffer.h" |
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#include "Magnum/Framebuffer.h" |
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#include "Magnum/Platform/Sdl2Application.h" |
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using namespace Magnum; |
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struct A: Platform::Sdl2Application { |
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/* [DefaultFramebuffer-usage-viewport] */ |
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void viewportEvent(const Vector2i& size) override { |
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defaultFramebuffer.setViewport({{}, size}); |
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// ...
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} |
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/* [DefaultFramebuffer-usage-viewport] */ |
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/* [DefaultFramebuffer-usage-clear] */ |
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void drawEvent() override { |
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defaultFramebuffer.clear(FramebufferClear::Color|FramebufferClear::Depth); |
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// ...
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} |
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/* [DefaultFramebuffer-usage-clear] */ |
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}; |
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struct B: Platform::Sdl2Application { |
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Framebuffer framebuffer; |
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/* [Framebuffer-usage-draw] */ |
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void drawEvent() override { |
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defaultFramebuffer.clear(FramebufferClear::Color); |
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framebuffer.clear(FramebufferClear::Color|FramebufferClear::Depth|FramebufferClear::Stencil); |
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framebuffer.bind(); |
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// ...
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defaultFramebuffer.bind(); |
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// ...
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swapBuffers(); |
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} |
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/* [Framebuffer-usage-draw] */ |
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}; |
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#include "Magnum/AbstractShaderProgram.h" |
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#include "Magnum/Buffer.h" |
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#include "Magnum/Context.h" |
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#include "Magnum/Extensions.h" |
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#include "Magnum/Mesh.h" |
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#include "Magnum/Texture.h" |
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#include "Magnum/TextureFormat.h" |
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using namespace Magnum; |
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std::tuple<Mesh, Buffer, Buffer> importSomeMesh(); |
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struct Foo { |
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void setSomeBuffer(GLuint); |
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GLuint someBuffer(); |
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} externalLib; |
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void foo(); |
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void foo() { |
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{ |
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/* [nocreate] */ |
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Mesh mesh{NoCreate}; |
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Buffer vertices{NoCreate}, indices{NoCreate}; |
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std::tie(mesh, vertices, indices) = importSomeMesh(); |
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/* [nocreate] */ |
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} |
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{ |
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char someData[1]; |
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/* [transfer] */ |
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/* Transferring the instance to external library */ |
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{ |
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Buffer buffer; |
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buffer.setData(someData, BufferUsage::StaticDraw); |
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GLuint id = buffer.release(); |
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externalLib.setSomeBuffer(id); /* The library is responsible for deletion */ |
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} |
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/* Acquiring an instance from external library */ |
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{ |
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GLuint id = externalLib.someBuffer(); |
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Buffer buffer = Buffer::wrap(id, ObjectFlag::DeleteOnDestruction); |
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/* The buffer instance now handles deletion */ |
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} |
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/* [transfer] */ |
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} |
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#ifndef MAGNUM_TARGET_GLES |
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{ |
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struct: AbstractShaderProgram {} someShader; |
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/* [state] */ |
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Buffer buffer; |
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Mesh mesh; |
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// ...
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mesh.draw(someShader); |
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{ |
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/* Entering a section with 3rd-party OpenGL code -- clean up all state that
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could cause accidental modifications of our objects from outside */ |
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Context::current().resetState(Context::State::EnterExternal); |
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/* Raw OpenGL calls */ |
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glBindBuffer(GL_ARRAY_BUFFER, buffer.id()); |
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glBufferStorage(GL_ARRAY_BUFFER, 32768, nullptr, GL_MAP_READ_BIT|GL_MAP_WRITE_BIT); |
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// ...
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/* Exiting a section with 3rd-party OpenGL code -- reset our state tracker */ |
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Context::current().resetState(Context::State::ExitExternal); |
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} |
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/* Use the buffer through Magnum again */ |
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auto data = buffer.map(0, 32768, Buffer::MapFlag::Read|Buffer::MapFlag::Write); |
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// ...
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/* [state] */ |
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static_cast<void>(data); |
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} |
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#endif |
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#ifndef MAGNUM_TARGET_GLES |
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{ |
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/* [extensions] */ |
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TextureFormat format; |
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if(Context::current().isExtensionSupported<Extensions::GL::ARB::depth_buffer_float>()) |
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format = TextureFormat::DepthComponent32F; |
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else |
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format = TextureFormat::DepthComponent24; |
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/* [extensions] */ |
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static_cast<void>(format); |
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} |
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#endif |
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#if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2)) |
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{ |
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/* [dsa] */ |
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Texture2D texture; |
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/* - on OpenGL 4.5+/ARB_direct_state_access this calls glTextureStorage2D()
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- if EXT_direct_state_access is available, calls glTextureStorage2DEXT() |
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- on OpenGL 4.2+/ARB_texture_storage and OpenGL ES 3.0+ calls glTexStorage2D() |
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- on OpenGL ES 2.0 with EXT_texture_storage calls glTexStorage2DEXT() |
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- otherwise emulated using a sequence of four glTexImage2D() calls */ |
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texture.setStorage(4, TextureFormat::RGBA8, {256, 256}); |
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/* [dsa] */ |
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} |
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#endif |
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} |
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