Julian Eisel
b468023aa1
Latest SteamVR OpenXR updates brought OpenGL support, but only with sRGB buffers. I think for DirectX it's the same now. It's not a big issue for us to use sRGB buffers, so that's what I will do for now. That way we shouldn't need hardcoded exceptions for specific runtimes that don't transform linear buffers correctly.
363 lines
13 KiB
C++
363 lines
13 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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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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# include "GHOST_ContextGLX.h"
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#elif defined(WIN32)
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# include "GHOST_ContextD3D.h"
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# include "GHOST_ContextWGL.h"
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# include "GHOST_SystemWin32.h"
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#endif
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#include "GHOST_C-api.h"
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#include "GHOST_Xr_intern.h"
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#include "GHOST_IXrGraphicsBinding.h"
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static bool choose_swapchain_format_from_candidates(std::vector<int64_t> gpu_binding_formats,
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std::vector<int64_t> runtime_formats,
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int64_t &r_result)
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{
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if (gpu_binding_formats.empty()) {
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return false;
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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 false;
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}
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r_result = *res;
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return true;
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}
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class GHOST_XrGraphicsBindingOpenGL : public GHOST_IXrGraphicsBinding {
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public:
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~GHOST_XrGraphicsBindingOpenGL()
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{
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if (m_fbo != 0) {
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glDeleteFramebuffers(1, &m_fbo);
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}
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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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#if defined(WITH_GHOST_X11)
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GHOST_ContextGLX *ctx_gl = static_cast<GHOST_ContextGLX *>(ghost_ctx);
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#else
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GHOST_ContextWGL *ctx_gl = static_cast<GHOST_ContextWGL *>(ghost_ctx);
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#endif
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static PFN_xrGetOpenGLGraphicsRequirementsKHR s_xrGetOpenGLGraphicsRequirementsKHR_fn =
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nullptr;
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XrGraphicsRequirementsOpenGLKHR gpu_requirements = {XR_TYPE_GRAPHICS_REQUIREMENTS_OPENGL_KHR};
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const XrVersion gl_version = XR_MAKE_VERSION(
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ctx_gl->m_contextMajorVersion, ctx_gl->m_contextMinorVersion, 0);
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if (!s_xrGetOpenGLGraphicsRequirementsKHR_fn &&
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XR_FAILED(xrGetInstanceProcAddr(
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instance,
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"xrGetOpenGLGraphicsRequirementsKHR",
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(PFN_xrVoidFunction *)&s_xrGetOpenGLGraphicsRequirementsKHR_fn))) {
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s_xrGetOpenGLGraphicsRequirementsKHR_fn = nullptr;
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}
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s_xrGetOpenGLGraphicsRequirementsKHR_fn(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) override
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{
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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->m_display, ctx_glx->m_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->m_display;
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oxr_binding.glx.glxFBConfig = ctx_glx->m_fbconfig;
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oxr_binding.glx.glxDrawable = ctx_glx->m_window;
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oxr_binding.glx.glxContext = ctx_glx->m_context;
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oxr_binding.glx.visualid = visual_info->visualid;
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XFree(visual_info);
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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->m_hDC;
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oxr_binding.wgl.hGLRC = ctx_wgl->m_hGLRC;
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#endif
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/* Generate a framebuffer to use for blitting into the texture. */
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glGenFramebuffers(1, &m_fbo);
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}
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bool chooseSwapchainFormat(const std::vector<int64_t> &runtime_formats,
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int64_t &r_result,
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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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GL_RGBA8,
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GL_SRGB8_ALPHA8,
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};
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if (choose_swapchain_format_from_candidates(gpu_binding_formats, runtime_formats, r_result)) {
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r_is_srgb_format = (r_result == GL_SRGB8_ALPHA8);
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return true;
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}
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return false;
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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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m_image_cache.push_back(std::move(ogl_images));
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return base_images;
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}
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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, m_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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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>> m_image_cache;
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GLuint m_fbo = 0;
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};
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#ifdef WIN32
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class GHOST_XrGraphicsBindingD3D : public GHOST_IXrGraphicsBinding {
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public:
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GHOST_XrGraphicsBindingD3D(GHOST_Context *ghost_ctx)
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: GHOST_IXrGraphicsBinding(), m_ghost_wgl_ctx(*static_cast<GHOST_ContextWGL *>(ghost_ctx))
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{
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m_ghost_d3d_ctx = GHOST_SystemWin32::createOffscreenContextD3D();
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}
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~GHOST_XrGraphicsBindingD3D()
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{
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if (m_shared_resource) {
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m_ghost_d3d_ctx->disposeSharedOpenGLResource(m_shared_resource);
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}
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if (m_ghost_d3d_ctx) {
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GHOST_SystemWin32::disposeContextD3D(m_ghost_d3d_ctx);
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}
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}
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bool checkVersionRequirements(
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GHOST_Context * /*ghost_ctx*/, /* Remember: This is the OpenGL context! */
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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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static PFN_xrGetD3D11GraphicsRequirementsKHR s_xrGetD3D11GraphicsRequirementsKHR_fn = nullptr;
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XrGraphicsRequirementsD3D11KHR gpu_requirements = {XR_TYPE_GRAPHICS_REQUIREMENTS_D3D11_KHR};
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if (!s_xrGetD3D11GraphicsRequirementsKHR_fn &&
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XR_FAILED(xrGetInstanceProcAddr(
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instance,
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"xrGetD3D11GraphicsRequirementsKHR",
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(PFN_xrVoidFunction *)&s_xrGetD3D11GraphicsRequirementsKHR_fn))) {
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s_xrGetD3D11GraphicsRequirementsKHR_fn = nullptr;
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}
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s_xrGetD3D11GraphicsRequirementsKHR_fn(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 << "Minimum DirectX 11 Feature Level " << gpu_requirements.minFeatureLevel
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<< std::endl;
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*r_requirement_info = std::move(strstream.str());
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}
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return m_ghost_d3d_ctx->m_device->GetFeatureLevel() >= gpu_requirements.minFeatureLevel;
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}
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void initFromGhostContext(
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GHOST_Context * /*ghost_ctx*/ /* Remember: This is the OpenGL context! */
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) override
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{
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oxr_binding.d3d11.type = XR_TYPE_GRAPHICS_BINDING_D3D11_KHR;
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oxr_binding.d3d11.device = m_ghost_d3d_ctx->m_device;
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}
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bool chooseSwapchainFormat(const std::vector<int64_t> &runtime_formats,
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int64_t &r_result,
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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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DXGI_FORMAT_R8G8B8A8_UNORM,
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DXGI_FORMAT_R8G8B8A8_UNORM_SRGB,
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};
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if (choose_swapchain_format_from_candidates(gpu_binding_formats, runtime_formats, r_result)) {
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r_is_srgb_format = (r_result == DXGI_FORMAT_R8G8B8A8_UNORM_SRGB);
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return true;
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}
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return false;
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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<XrSwapchainImageD3D11KHR> d3d_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 (XrSwapchainImageD3D11KHR &image : d3d_images) {
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image.type = XR_TYPE_SWAPCHAIN_IMAGE_D3D11_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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m_image_cache.push_back(std::move(d3d_images));
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return base_images;
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}
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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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XrSwapchainImageD3D11KHR *d3d_swapchain_image = reinterpret_cast<XrSwapchainImageD3D11KHR *>(
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swapchain_image);
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# if 0
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/* Ideally we'd just create a render target view for the OpenXR swap-chain image texture and
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* blit from the OpenGL context into it. The NV_DX_interop extension doesn't want to work with
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* this though. At least not with Optimus hardware. See:
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* https://github.com/mpv-player/mpv/issues/2949#issuecomment-197262807.
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*/
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ID3D11RenderTargetView *rtv;
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CD3D11_RENDER_TARGET_VIEW_DESC rtv_desc(D3D11_RTV_DIMENSION_TEXTURE2D,
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DXGI_FORMAT_R8G8B8A8_UNORM);
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m_ghost_ctx->m_device->CreateRenderTargetView(d3d_swapchain_image->texture, &rtv_desc, &rtv);
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if (!m_shared_resource) {
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m_shared_resource = m_ghost_ctx->createSharedOpenGLResource(
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draw_info->width, draw_info->height, rtv);
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}
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m_ghost_ctx->blitFromOpenGLContext(m_shared_resource, draw_info->width, draw_info->height);
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# else
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if (!m_shared_resource) {
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m_shared_resource = m_ghost_d3d_ctx->createSharedOpenGLResource(draw_info->width,
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draw_info->height);
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}
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m_ghost_d3d_ctx->blitFromOpenGLContext(m_shared_resource, draw_info->width, draw_info->height);
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m_ghost_d3d_ctx->m_device_ctx->OMSetRenderTargets(0, nullptr, nullptr);
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m_ghost_d3d_ctx->m_device_ctx->CopyResource(
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d3d_swapchain_image->texture, m_ghost_d3d_ctx->getSharedTexture2D(m_shared_resource));
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# endif
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}
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bool needsUpsideDownDrawing(GHOST_Context &) const
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{
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return m_ghost_d3d_ctx->isUpsideDown();
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}
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private:
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/** Primary OpenGL context for Blender to use for drawing. */
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GHOST_ContextWGL &m_ghost_wgl_ctx;
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/** Secondary DirectX 11 context to share with OpenGL context. */
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GHOST_ContextD3D *m_ghost_d3d_ctx = nullptr;
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/** Handle to shared resource object. */
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GHOST_SharedOpenGLResource *m_shared_resource = nullptr;
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std::list<std::vector<XrSwapchainImageD3D11KHR>> m_image_cache;
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};
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#endif // WIN32
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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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case GHOST_kXrGraphicsOpenGL:
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return std::unique_ptr<GHOST_XrGraphicsBindingOpenGL>(new GHOST_XrGraphicsBindingOpenGL());
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#ifdef WIN32
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case GHOST_kXrGraphicsD3D11:
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return std::unique_ptr<GHOST_XrGraphicsBindingD3D>(new GHOST_XrGraphicsBindingD3D(context));
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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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