341 lines
12 KiB
C++
341 lines
12 KiB
C++
/* SPDX-FileCopyrightText: 2020-2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup GHOST
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*/
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#include <algorithm>
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#include <list>
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#include <sstream>
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#if defined(WITH_GHOST_X11)
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# if defined(WITH_OPENGL_BACKEND)
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# include "GHOST_ContextEGL.hh"
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# include "GHOST_ContextGLX.hh"
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# endif
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# include "GHOST_SystemX11.hh"
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#endif
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#if defined(WITH_GHOST_WAYLAND)
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# if defined(WITH_OPENGL_BACKEND)
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# include "GHOST_ContextEGL.hh"
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# endif
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# include "GHOST_SystemWayland.hh"
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#endif
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#if defined(WIN32)
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# include "GHOST_ContextD3D.hh"
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# include "GHOST_ContextWGL.hh"
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# include "GHOST_SystemWin32.hh"
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# include "GHOST_XrGraphicsBindingD3D.hh"
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#endif
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#ifdef WITH_VULKAN_BACKEND
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# include "GHOST_XrGraphicsBindingVulkan.hh"
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#endif
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#ifdef WITH_METAL_BACKEND
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# include "GHOST_XrGraphicsBindingMetal.hh"
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#endif
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#include "GHOST_IXrGraphicsBinding.hh"
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#if defined(WITH_OPENGL_BACKEND)
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static std::optional<int64_t> choose_swapchain_format_from_candidates(
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const std::vector<int64_t> &gpu_binding_formats, const std::vector<int64_t> &runtime_formats)
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{
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if (gpu_binding_formats.empty()) {
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return std::nullopt;
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}
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auto res = std::find_first_of(gpu_binding_formats.begin(),
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gpu_binding_formats.end(),
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runtime_formats.begin(),
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runtime_formats.end());
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if (res == gpu_binding_formats.end()) {
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return std::nullopt;
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}
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return *res;
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}
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class GHOST_XrGraphicsBindingOpenGL : public GHOST_IXrGraphicsBinding {
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PFN_xrGetOpenGLGraphicsRequirementsKHR xrGetOpenGLGraphicsRequirementsKHR_ = nullptr;
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public:
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~GHOST_XrGraphicsBindingOpenGL()
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{
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if (fbo_ != 0) {
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glDeleteFramebuffers(1, &fbo_);
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}
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}
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bool loadExtensionFunctions(XrInstance instance) override
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{
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# define LOAD_FUNCTION(fn_ptr, name) \
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if (XR_FAILED(xrGetInstanceProcAddr(instance, #name, (PFN_xrVoidFunction *)&fn_ptr))) { \
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return false; \
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}
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LOAD_FUNCTION(xrGetOpenGLGraphicsRequirementsKHR_, xrGetOpenGLGraphicsRequirementsKHR);
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# undef LOAD_FUNCTION
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return true;
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}
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bool checkVersionRequirements(GHOST_Context &ghost_ctx,
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XrInstance instance,
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XrSystemId system_id,
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std::string *r_requirement_info) const override
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{
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int gl_major_version, gl_minor_version;
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# if defined(WIN32)
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GHOST_ContextWGL &ctx_gl = static_cast<GHOST_ContextWGL &>(ghost_ctx);
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gl_major_version = ctx_gl.context_major_version_;
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gl_minor_version = ctx_gl.context_minor_version_;
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# elif defined(WITH_GHOST_X11) || defined(WITH_GHOST_WAYLAND)
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if (dynamic_cast<GHOST_ContextEGL *>(&ghost_ctx)) {
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GHOST_ContextEGL &ctx_gl = static_cast<GHOST_ContextEGL &>(ghost_ctx);
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gl_major_version = ctx_gl.context_major_version_;
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gl_minor_version = ctx_gl.context_minor_version_;
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}
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# if defined(WITH_GHOST_X11)
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else {
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GHOST_ContextGLX &ctx_gl = static_cast<GHOST_ContextGLX &>(ghost_ctx);
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gl_major_version = ctx_gl.context_major_version_;
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gl_minor_version = ctx_gl.context_minor_version_;
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}
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# endif
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# endif
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// static XrInstance s_instance = XR_NULL_HANDLE;
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XrGraphicsRequirementsOpenGLKHR gpu_requirements = {XR_TYPE_GRAPHICS_REQUIREMENTS_OPENGL_KHR};
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const XrVersion gl_version = XR_MAKE_VERSION(gl_major_version, gl_minor_version, 0);
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xrGetOpenGLGraphicsRequirementsKHR_(instance, system_id, &gpu_requirements);
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if (r_requirement_info) {
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std::ostringstream strstream;
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strstream << "Min OpenGL version "
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<< XR_VERSION_MAJOR(gpu_requirements.minApiVersionSupported) << "."
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<< XR_VERSION_MINOR(gpu_requirements.minApiVersionSupported) << std::endl;
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strstream << "Max OpenGL version "
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<< XR_VERSION_MAJOR(gpu_requirements.maxApiVersionSupported) << "."
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<< XR_VERSION_MINOR(gpu_requirements.maxApiVersionSupported) << std::endl;
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*r_requirement_info = strstream.str();
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}
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return (gl_version >= gpu_requirements.minApiVersionSupported) &&
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(gl_version <= gpu_requirements.maxApiVersionSupported);
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}
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void initFromGhostContext(GHOST_Context &ghost_ctx,
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XrInstance /*instance*/,
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XrSystemId /*system_id*/) override
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{
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# if defined(WITH_GHOST_X11) || defined(WITH_GHOST_WAYLAND)
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/* WAYLAND/X11 may be dynamically selected at load time but both may also be
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* supported at compile time individually.
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* Without `is_ctx_egl` & `is_wayland` preprocessor checks become an unmanageable soup. */
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const bool is_ctx_egl = dynamic_cast<GHOST_ContextEGL *>(&ghost_ctx) != nullptr;
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if (is_ctx_egl) {
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GHOST_ContextEGL &ctx_egl = static_cast<GHOST_ContextEGL &>(ghost_ctx);
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const bool is_wayland = (
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# if defined(WITH_GHOST_WAYLAND)
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dynamic_cast<const GHOST_SystemWayland *const>(ctx_egl.system_) != nullptr
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# else
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false
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# endif
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);
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if (is_wayland) {
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# if defined(WITH_GHOST_WAYLAND)
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/* #GHOST_SystemWayland */
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oxr_binding.wl.type = XR_TYPE_GRAPHICS_BINDING_OPENGL_WAYLAND_KHR;
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oxr_binding.wl.display = (wl_display *)ctx_egl.native_display_;
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# else
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GHOST_ASSERT(false, "Unexpected State: logical error, unreachable!");
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# endif /* !WITH_GHOST_WAYLAND */
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}
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else { /* `!is_wayland` */
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# if defined(WITH_GHOST_X11)
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/* #GHOST_SystemX11. */
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oxr_binding.egl.type = XR_TYPE_GRAPHICS_BINDING_EGL_MNDX;
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# if XR_CURRENT_API_VERSION >= XR_MAKE_VERSION(1, 0, 29)
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oxr_binding.egl.getProcAddress = reinterpret_cast<PFN_xrEglGetProcAddressMNDX>(
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eglGetProcAddress);
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# else
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oxr_binding.egl.getProcAddress = reinterpret_cast<PFNEGLGETPROCADDRESSPROC>(
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eglGetProcAddress);
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# endif
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oxr_binding.egl.display = ctx_egl.getDisplay();
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oxr_binding.egl.config = ctx_egl.getConfig();
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oxr_binding.egl.context = ctx_egl.getContext();
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# else
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GHOST_ASSERT(false, "Unexpected State: built with only WAYLAND and no System found!");
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# endif /* !WITH_GHOST_X11 */
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}
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}
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else { /* `!is_ctx_egl` */
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# if defined(WITH_GHOST_X11)
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GHOST_ContextGLX &ctx_glx = static_cast<GHOST_ContextGLX &>(ghost_ctx);
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XVisualInfo *visual_info = glXGetVisualFromFBConfig(ctx_glx.display_, ctx_glx.fbconfig_);
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oxr_binding.glx.type = XR_TYPE_GRAPHICS_BINDING_OPENGL_XLIB_KHR;
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oxr_binding.glx.xDisplay = ctx_glx.display_;
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oxr_binding.glx.glxFBConfig = ctx_glx.fbconfig_;
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oxr_binding.glx.glxDrawable = ctx_glx.window_;
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oxr_binding.glx.glxContext = ctx_glx.context_;
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oxr_binding.glx.visualid = visual_info->visualid;
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XFree(visual_info);
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# else
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GHOST_ASSERT(false, "Unexpected State: built without X11 and no EGL context is available!");
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# endif /* !WITH_GHOST_X11 */
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}
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# elif defined(WIN32)
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GHOST_ContextWGL &ctx_wgl = static_cast<GHOST_ContextWGL &>(ghost_ctx);
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oxr_binding.wgl.type = XR_TYPE_GRAPHICS_BINDING_OPENGL_WIN32_KHR;
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oxr_binding.wgl.hDC = ctx_wgl.h_DC_;
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oxr_binding.wgl.hGLRC = ctx_wgl.h_GLRC_;
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# endif /* WIN32 */
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/* Generate a frame-buffer to use for blitting into the texture. */
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glGenFramebuffers(1, &fbo_);
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}
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std::optional<int64_t> chooseSwapchainFormat(const std::vector<int64_t> &runtime_formats,
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GHOST_TXrSwapchainFormat &r_format,
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bool &r_is_srgb_format) const override
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{
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std::vector<int64_t> gpu_binding_formats = {
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# if 0 /* RGB10A2, RGBA16 don't seem to work with Oculus head-sets, \
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* so move them after RGBA16F for the time being. */
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GL_RGB10_A2,
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GL_RGBA16,
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# endif
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GL_RGBA16F,
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# if 1
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GL_RGB10_A2,
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GL_RGBA16,
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# endif
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GL_RGBA8,
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GL_SRGB8_ALPHA8,
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};
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std::optional result = choose_swapchain_format_from_candidates(gpu_binding_formats,
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runtime_formats);
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if (result) {
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switch (*result) {
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case GL_RGB10_A2:
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r_format = GHOST_kXrSwapchainFormatRGB10_A2;
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break;
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case GL_RGBA16:
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r_format = GHOST_kXrSwapchainFormatRGBA16;
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break;
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case GL_RGBA16F:
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r_format = GHOST_kXrSwapchainFormatRGBA16F;
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break;
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case GL_RGBA8:
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case GL_SRGB8_ALPHA8:
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r_format = GHOST_kXrSwapchainFormatRGBA8;
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break;
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}
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r_is_srgb_format = (*result == GL_SRGB8_ALPHA8);
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}
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else {
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r_format = GHOST_kXrSwapchainFormatRGBA8;
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r_is_srgb_format = false;
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}
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return result;
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}
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std::vector<XrSwapchainImageBaseHeader *> createSwapchainImages(uint32_t image_count) override
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{
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std::vector<XrSwapchainImageOpenGLKHR> ogl_images(image_count);
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std::vector<XrSwapchainImageBaseHeader *> base_images;
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/* Need to return vector of base header pointers, so of a different type. Need to build a new
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* list with this type, and keep the initial one alive. */
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for (XrSwapchainImageOpenGLKHR &image : ogl_images) {
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image.type = XR_TYPE_SWAPCHAIN_IMAGE_OPENGL_KHR;
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base_images.push_back(reinterpret_cast<XrSwapchainImageBaseHeader *>(&image));
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}
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/* Keep alive. */
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image_cache_.push_back(std::move(ogl_images));
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return base_images;
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}
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void submitToSwapchainBegin() override {}
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void submitToSwapchainImage(XrSwapchainImageBaseHeader &swapchain_image,
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const GHOST_XrDrawViewInfo &draw_info) override
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{
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XrSwapchainImageOpenGLKHR &ogl_swapchain_image = reinterpret_cast<XrSwapchainImageOpenGLKHR &>(
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swapchain_image);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo_);
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glFramebufferTexture2D(
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GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, ogl_swapchain_image.image, 0);
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glBlitFramebuffer(draw_info.ofsx,
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draw_info.ofsy,
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draw_info.ofsx + draw_info.width,
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draw_info.ofsy + draw_info.height,
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draw_info.ofsx,
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draw_info.ofsy,
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draw_info.ofsx + draw_info.width,
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draw_info.ofsy + draw_info.height,
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GL_COLOR_BUFFER_BIT,
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GL_LINEAR);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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void submitToSwapchainEnd() override {}
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bool needsUpsideDownDrawing(GHOST_Context &ghost_ctx) const override
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{
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return ghost_ctx.isUpsideDown();
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}
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private:
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std::list<std::vector<XrSwapchainImageOpenGLKHR>> image_cache_;
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GLuint fbo_ = 0;
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};
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#endif
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std::unique_ptr<GHOST_IXrGraphicsBinding> GHOST_XrGraphicsBindingCreateFromType(
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GHOST_TXrGraphicsBinding type, GHOST_Context &context)
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{
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switch (type) {
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#ifdef WITH_OPENGL_BACKEND
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case GHOST_kXrGraphicsOpenGL:
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return std::make_unique<GHOST_XrGraphicsBindingOpenGL>();
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#endif
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#ifdef WITH_VULKAN_BACKEND
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case GHOST_kXrGraphicsVulkan:
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return std::make_unique<GHOST_XrGraphicsBindingVulkan>(context);
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#endif
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#ifdef WITH_METAL_BACKEND
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case GHOST_kXrGraphicsMetal:
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return std::make_unique<GHOST_XrGraphicsBindingMetal>(context);
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#endif
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#ifdef WIN32
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# ifdef WITH_OPENGL_BACKEND
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case GHOST_kXrGraphicsOpenGLD3D11:
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return std::make_unique<GHOST_XrGraphicsBindingOpenGLD3D>(context);
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# endif
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# ifdef WITH_VULKAN_BACKEND
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case GHOST_kXrGraphicsVulkanD3D11:
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return std::make_unique<GHOST_XrGraphicsBindingVulkanD3D>(context);
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# endif
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#endif
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default:
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return nullptr;
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}
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(void)context; /* Might be unused. */
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}
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