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virtualx-engine/modules/openxr/extensions/openxr_opengl_extension.cpp
Rémi Verschelde 25b2f1780a
Style: Harmonize header includes in modules 
This applies our existing style guide, and adds a new rule to that style
guide for modular components such as platform ports and modules:

Includes from the platform port or module ("local" includes) should be listed
first in their own block using relative paths, before Godot's "core" includes
which use "absolute" (project folder relative) paths, and finally thirdparty
includes.

Includes in `#ifdef`s come after their relevant section, i.e. the overall
structure is:

- Local includes
  * Conditional local includes
- Core includes
  * Conditional core includes
- Thirdparty includes
  * Conditional thirdparty includes
2023-06-15 14:35:45 +02:00

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/**************************************************************************/
/* openxr_opengl_extension.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "openxr_opengl_extension.h"
#ifdef GLES3_ENABLED
#include "../openxr_util.h"
#include "drivers/gles3/effects/copy_effects.h"
#include "drivers/gles3/storage/texture_storage.h"
#include "servers/rendering/rendering_server_globals.h"
#include "servers/rendering_server.h"
// OpenXR requires us to submit sRGB textures so that it recognizes the content
// as being in sRGB color space. We do fall back on "normal" textures but this
// will likely result in incorrect colors as OpenXR will double the sRGB conversion.
// All major XR runtimes support sRGB textures.
// In OpenGL output of the fragment shader is assumed to be in the color space of
// the developers choice, however a linear to sRGB HW conversion can be enabled
// through enabling GL_FRAMEBUFFER_SRGB if an sRGB color attachment is used.
// This is a global setting.
// See: https://www.khronos.org/opengl/wiki/Framebuffer
// In OpenGLES output of the fragment shader is assumed to be in linear color space
// and will be converted by default to sRGB if an sRGB color attachment is used.
// The extension GL_EXT_sRGB_write_control was introduced to enable turning this
// feature off.
// See: https://registry.khronos.org/OpenGL/extensions/EXT/EXT_sRGB_write_control.txt
// On OpenGLES this is not defined in our standard headers..
#ifndef GL_FRAMEBUFFER_SRGB
#define GL_FRAMEBUFFER_SRGB 0x8DB9
#endif
HashMap<String, bool *> OpenXROpenGLExtension::get_requested_extensions() {
HashMap<String, bool *> request_extensions;
#ifdef ANDROID_ENABLED
request_extensions[XR_KHR_OPENGL_ES_ENABLE_EXTENSION_NAME] = nullptr;
#else
request_extensions[XR_KHR_OPENGL_ENABLE_EXTENSION_NAME] = nullptr;
#endif
return request_extensions;
}
void OpenXROpenGLExtension::on_instance_created(const XrInstance p_instance) {
// Obtain pointers to functions we're accessing here.
ERR_FAIL_NULL(OpenXRAPI::get_singleton());
#ifdef ANDROID_ENABLED
EXT_INIT_XR_FUNC(xrGetOpenGLESGraphicsRequirementsKHR);
#else
EXT_INIT_XR_FUNC(xrGetOpenGLGraphicsRequirementsKHR);
#endif
EXT_INIT_XR_FUNC(xrEnumerateSwapchainImages);
}
bool OpenXROpenGLExtension::check_graphics_api_support(XrVersion p_desired_version) {
ERR_FAIL_NULL_V(OpenXRAPI::get_singleton(), false);
XrSystemId system_id = OpenXRAPI::get_singleton()->get_system_id();
XrInstance instance = OpenXRAPI::get_singleton()->get_instance();
#ifdef ANDROID_ENABLED
XrGraphicsRequirementsOpenGLESKHR opengl_requirements;
opengl_requirements.type = XR_TYPE_GRAPHICS_REQUIREMENTS_OPENGL_ES_KHR;
opengl_requirements.next = nullptr;
XrResult result = xrGetOpenGLESGraphicsRequirementsKHR(instance, system_id, &opengl_requirements);
if (!OpenXRAPI::get_singleton()->xr_result(result, "Failed to get OpenGL graphics requirements!")) {
return false;
}
#else
XrGraphicsRequirementsOpenGLKHR opengl_requirements;
opengl_requirements.type = XR_TYPE_GRAPHICS_REQUIREMENTS_OPENGL_KHR;
opengl_requirements.next = nullptr;
XrResult result = xrGetOpenGLGraphicsRequirementsKHR(instance, system_id, &opengl_requirements);
if (!OpenXRAPI::get_singleton()->xr_result(result, "Failed to get OpenGL graphics requirements!")) {
return false;
}
#endif
if (p_desired_version < opengl_requirements.minApiVersionSupported) {
print_line("OpenXR: Requested OpenGL version does not meet the minimum version this runtime supports.");
print_line("- desired_version ", OpenXRUtil::make_xr_version_string(p_desired_version));
print_line("- minApiVersionSupported ", OpenXRUtil::make_xr_version_string(opengl_requirements.minApiVersionSupported));
print_line("- maxApiVersionSupported ", OpenXRUtil::make_xr_version_string(opengl_requirements.maxApiVersionSupported));
return false;
}
if (p_desired_version > opengl_requirements.maxApiVersionSupported) {
print_line("OpenXR: Requested OpenGL version exceeds the maximum version this runtime has been tested on and is known to support.");
print_line("- desired_version ", OpenXRUtil::make_xr_version_string(p_desired_version));
print_line("- minApiVersionSupported ", OpenXRUtil::make_xr_version_string(opengl_requirements.minApiVersionSupported));
print_line("- maxApiVersionSupported ", OpenXRUtil::make_xr_version_string(opengl_requirements.maxApiVersionSupported));
}
return true;
}
#ifdef WIN32
XrGraphicsBindingOpenGLWin32KHR OpenXROpenGLExtension::graphics_binding_gl;
#elif ANDROID_ENABLED
XrGraphicsBindingOpenGLESAndroidKHR OpenXROpenGLExtension::graphics_binding_gl;
#else
XrGraphicsBindingOpenGLXlibKHR OpenXROpenGLExtension::graphics_binding_gl;
#endif
void *OpenXROpenGLExtension::set_session_create_and_get_next_pointer(void *p_next_pointer) {
XrVersion desired_version = XR_MAKE_VERSION(3, 3, 0);
if (!check_graphics_api_support(desired_version)) {
print_line("OpenXR: Trying to initialize with OpenGL anyway...");
//return p_next_pointer;
}
DisplayServer *display_server = DisplayServer::get_singleton();
#ifdef WIN32
graphics_binding_gl.type = XR_TYPE_GRAPHICS_BINDING_OPENGL_WIN32_KHR,
graphics_binding_gl.next = p_next_pointer;
graphics_binding_gl.hDC = (HDC)display_server->window_get_native_handle(DisplayServer::WINDOW_VIEW);
graphics_binding_gl.hGLRC = (HGLRC)display_server->window_get_native_handle(DisplayServer::OPENGL_CONTEXT);
#elif ANDROID_ENABLED
graphics_binding_gl.type = XR_TYPE_GRAPHICS_BINDING_OPENGL_ES_ANDROID_KHR;
graphics_binding_gl.next = p_next_pointer;
graphics_binding_gl.display = (void *)display_server->window_get_native_handle(DisplayServer::DISPLAY_HANDLE);
graphics_binding_gl.config = (EGLConfig)0; // https://github.com/KhronosGroup/OpenXR-SDK-Source/blob/master/src/tests/hello_xr/graphicsplugin_opengles.cpp#L122
graphics_binding_gl.context = (void *)display_server->window_get_native_handle(DisplayServer::OPENGL_CONTEXT);
#else
graphics_binding_gl.type = XR_TYPE_GRAPHICS_BINDING_OPENGL_XLIB_KHR;
graphics_binding_gl.next = p_next_pointer;
void *display_handle = (void *)display_server->window_get_native_handle(DisplayServer::DISPLAY_HANDLE);
void *glxcontext_handle = (void *)display_server->window_get_native_handle(DisplayServer::OPENGL_CONTEXT);
void *glxdrawable_handle = (void *)display_server->window_get_native_handle(DisplayServer::WINDOW_HANDLE);
graphics_binding_gl.xDisplay = (Display *)display_handle;
graphics_binding_gl.glxContext = (GLXContext)glxcontext_handle;
graphics_binding_gl.glxDrawable = (GLXDrawable)glxdrawable_handle;
// spec says to use proper values but runtimes don't care
graphics_binding_gl.visualid = 0;
graphics_binding_gl.glxFBConfig = 0;
#endif
return &graphics_binding_gl;
}
void OpenXROpenGLExtension::get_usable_swapchain_formats(Vector<int64_t> &p_usable_swap_chains) {
p_usable_swap_chains.push_back(GL_SRGB8_ALPHA8);
p_usable_swap_chains.push_back(GL_RGBA8);
}
void OpenXROpenGLExtension::get_usable_depth_formats(Vector<int64_t> &p_usable_depth_formats) {
p_usable_depth_formats.push_back(GL_DEPTH_COMPONENT32F);
p_usable_depth_formats.push_back(GL_DEPTH24_STENCIL8);
p_usable_depth_formats.push_back(GL_DEPTH32F_STENCIL8);
p_usable_depth_formats.push_back(GL_DEPTH_COMPONENT24);
}
void OpenXROpenGLExtension::on_pre_draw_viewport(RID p_render_target) {
if (srgb_ext_is_available) {
hw_linear_to_srgb_is_enabled = glIsEnabled(GL_FRAMEBUFFER_SRGB);
if (hw_linear_to_srgb_is_enabled) {
// Disable this.
glDisable(GL_FRAMEBUFFER_SRGB);
}
}
}
void OpenXROpenGLExtension::on_post_draw_viewport(RID p_render_target) {
if (srgb_ext_is_available && hw_linear_to_srgb_is_enabled) {
// Re-enable this.
glEnable(GL_FRAMEBUFFER_SRGB);
}
}
bool OpenXROpenGLExtension::get_swapchain_image_data(XrSwapchain p_swapchain, int64_t p_swapchain_format, uint32_t p_width, uint32_t p_height, uint32_t p_sample_count, uint32_t p_array_size, void **r_swapchain_graphics_data) {
GLES3::TextureStorage *texture_storage = GLES3::TextureStorage::get_singleton();
ERR_FAIL_NULL_V(texture_storage, false);
uint32_t swapchain_length;
XrResult result = xrEnumerateSwapchainImages(p_swapchain, 0, &swapchain_length, nullptr);
if (XR_FAILED(result)) {
print_line("OpenXR: Failed to get swapchaim image count [", OpenXRAPI::get_singleton()->get_error_string(result), "]");
return false;
}
#ifdef ANDROID_ENABLED
XrSwapchainImageOpenGLESKHR *images = (XrSwapchainImageOpenGLESKHR *)memalloc(sizeof(XrSwapchainImageOpenGLESKHR) * swapchain_length);
#else
XrSwapchainImageOpenGLKHR *images = (XrSwapchainImageOpenGLKHR *)memalloc(sizeof(XrSwapchainImageOpenGLKHR) * swapchain_length);
#endif
ERR_FAIL_NULL_V_MSG(images, false, "OpenXR Couldn't allocate memory for swap chain image");
for (uint64_t i = 0; i < swapchain_length; i++) {
#ifdef ANDROID_ENABLED
images[i].type = XR_TYPE_SWAPCHAIN_IMAGE_OPENGL_ES_KHR;
#else
images[i].type = XR_TYPE_SWAPCHAIN_IMAGE_OPENGL_KHR;
#endif
images[i].next = nullptr;
images[i].image = 0;
}
result = xrEnumerateSwapchainImages(p_swapchain, swapchain_length, &swapchain_length, (XrSwapchainImageBaseHeader *)images);
if (XR_FAILED(result)) {
print_line("OpenXR: Failed to get swapchaim images [", OpenXRAPI::get_singleton()->get_error_string(result), "]");
memfree(images);
return false;
}
SwapchainGraphicsData *data = memnew(SwapchainGraphicsData);
if (data == nullptr) {
print_line("OpenXR: Failed to allocate memory for swapchain data");
memfree(images);
return false;
}
*r_swapchain_graphics_data = data;
data->is_multiview = (p_array_size > 1);
Image::Format format = Image::FORMAT_RGBA8;
Vector<RID> texture_rids;
for (uint64_t i = 0; i < swapchain_length; i++) {
RID texture_rid = texture_storage->texture_create_external(
p_array_size == 1 ? GLES3::Texture::TYPE_2D : GLES3::Texture::TYPE_LAYERED,
format,
images[i].image,
p_width,
p_height,
1,
p_array_size);
texture_rids.push_back(texture_rid);
}
data->texture_rids = texture_rids;
memfree(images);
return true;
}
bool OpenXROpenGLExtension::create_projection_fov(const XrFovf p_fov, double p_z_near, double p_z_far, Projection &r_camera_matrix) {
XrMatrix4x4f matrix;
XrMatrix4x4f_CreateProjectionFov(&matrix, GRAPHICS_OPENGL, p_fov, (float)p_z_near, (float)p_z_far);
for (int j = 0; j < 4; j++) {
for (int i = 0; i < 4; i++) {
r_camera_matrix.columns[j][i] = matrix.m[j * 4 + i];
}
}
return true;
}
RID OpenXROpenGLExtension::get_texture(void *p_swapchain_graphics_data, int p_image_index) {
SwapchainGraphicsData *data = (SwapchainGraphicsData *)p_swapchain_graphics_data;
ERR_FAIL_NULL_V(data, RID());
ERR_FAIL_INDEX_V(p_image_index, data->texture_rids.size(), RID());
return data->texture_rids[p_image_index];
}
void OpenXROpenGLExtension::cleanup_swapchain_graphics_data(void **p_swapchain_graphics_data) {
if (*p_swapchain_graphics_data == nullptr) {
return;
}
GLES3::TextureStorage *texture_storage = GLES3::TextureStorage::get_singleton();
ERR_FAIL_NULL(texture_storage);
SwapchainGraphicsData *data = (SwapchainGraphicsData *)*p_swapchain_graphics_data;
for (int i = 0; i < data->texture_rids.size(); i++) {
texture_storage->texture_free(data->texture_rids[i]);
}
data->texture_rids.clear();
memdelete(data);
*p_swapchain_graphics_data = nullptr;
}
#define ENUM_TO_STRING_CASE(e) \
case e: { \
return String(#e); \
} break;
String OpenXROpenGLExtension::get_swapchain_format_name(int64_t p_swapchain_format) const {
// These are somewhat different per platform, will need to weed some stuff out...
switch (p_swapchain_format) {
#ifdef ANDROID_ENABLED
// using definitions from GLES3/gl3.h
ENUM_TO_STRING_CASE(GL_RGBA4)
ENUM_TO_STRING_CASE(GL_RGB5_A1)
ENUM_TO_STRING_CASE(GL_RGB565)
ENUM_TO_STRING_CASE(GL_RGB8)
ENUM_TO_STRING_CASE(GL_RGBA8)
ENUM_TO_STRING_CASE(GL_RGB10_A2)
ENUM_TO_STRING_CASE(GL_RGBA32F)
ENUM_TO_STRING_CASE(GL_RGB32F)
ENUM_TO_STRING_CASE(GL_RGBA16F)
ENUM_TO_STRING_CASE(GL_RGB16F)
ENUM_TO_STRING_CASE(GL_R11F_G11F_B10F)
ENUM_TO_STRING_CASE(GL_UNSIGNED_INT_10F_11F_11F_REV)
ENUM_TO_STRING_CASE(GL_RGB9_E5)
ENUM_TO_STRING_CASE(GL_UNSIGNED_INT_5_9_9_9_REV)
ENUM_TO_STRING_CASE(GL_RGBA32UI)
ENUM_TO_STRING_CASE(GL_RGB32UI)
ENUM_TO_STRING_CASE(GL_RGBA16UI)
ENUM_TO_STRING_CASE(GL_RGB16UI)
ENUM_TO_STRING_CASE(GL_RGBA8UI)
ENUM_TO_STRING_CASE(GL_RGB8UI)
ENUM_TO_STRING_CASE(GL_RGBA32I)
ENUM_TO_STRING_CASE(GL_RGB32I)
ENUM_TO_STRING_CASE(GL_RGBA16I)
ENUM_TO_STRING_CASE(GL_RGB16I)
ENUM_TO_STRING_CASE(GL_RGBA8I)
ENUM_TO_STRING_CASE(GL_RGB8I)
ENUM_TO_STRING_CASE(GL_RG)
ENUM_TO_STRING_CASE(GL_RG_INTEGER)
ENUM_TO_STRING_CASE(GL_R8)
ENUM_TO_STRING_CASE(GL_RG8)
ENUM_TO_STRING_CASE(GL_R16F)
ENUM_TO_STRING_CASE(GL_R32F)
ENUM_TO_STRING_CASE(GL_RG16F)
ENUM_TO_STRING_CASE(GL_RG32F)
ENUM_TO_STRING_CASE(GL_R8I)
ENUM_TO_STRING_CASE(GL_R8UI)
ENUM_TO_STRING_CASE(GL_R16I)
ENUM_TO_STRING_CASE(GL_R16UI)
ENUM_TO_STRING_CASE(GL_R32I)
ENUM_TO_STRING_CASE(GL_R32UI)
ENUM_TO_STRING_CASE(GL_RG8I)
ENUM_TO_STRING_CASE(GL_RG8UI)
ENUM_TO_STRING_CASE(GL_RG16I)
ENUM_TO_STRING_CASE(GL_RG16UI)
ENUM_TO_STRING_CASE(GL_RG32I)
ENUM_TO_STRING_CASE(GL_RG32UI)
ENUM_TO_STRING_CASE(GL_R8_SNORM)
ENUM_TO_STRING_CASE(GL_RG8_SNORM)
ENUM_TO_STRING_CASE(GL_RGB8_SNORM)
ENUM_TO_STRING_CASE(GL_RGBA8_SNORM)
ENUM_TO_STRING_CASE(GL_RGB10_A2UI)
ENUM_TO_STRING_CASE(GL_SRGB)
ENUM_TO_STRING_CASE(GL_SRGB8)
ENUM_TO_STRING_CASE(GL_SRGB8_ALPHA8)
ENUM_TO_STRING_CASE(GL_COMPRESSED_R11_EAC)
ENUM_TO_STRING_CASE(GL_COMPRESSED_SIGNED_R11_EAC)
ENUM_TO_STRING_CASE(GL_COMPRESSED_RG11_EAC)
ENUM_TO_STRING_CASE(GL_COMPRESSED_SIGNED_RG11_EAC)
ENUM_TO_STRING_CASE(GL_COMPRESSED_RGB8_ETC2)
ENUM_TO_STRING_CASE(GL_COMPRESSED_SRGB8_ETC2)
ENUM_TO_STRING_CASE(GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2)
ENUM_TO_STRING_CASE(GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2)
ENUM_TO_STRING_CASE(GL_COMPRESSED_RGBA8_ETC2_EAC)
ENUM_TO_STRING_CASE(GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC)
ENUM_TO_STRING_CASE(GL_DEPTH_COMPONENT16)
ENUM_TO_STRING_CASE(GL_DEPTH_COMPONENT24)
ENUM_TO_STRING_CASE(GL_DEPTH24_STENCIL8)
#else
// using definitions from GLAD
ENUM_TO_STRING_CASE(GL_R8_SNORM)
ENUM_TO_STRING_CASE(GL_RG8_SNORM)
ENUM_TO_STRING_CASE(GL_RGB8_SNORM)
ENUM_TO_STRING_CASE(GL_RGBA8_SNORM)
ENUM_TO_STRING_CASE(GL_R16_SNORM)
ENUM_TO_STRING_CASE(GL_RG16_SNORM)
ENUM_TO_STRING_CASE(GL_RGB16_SNORM)
ENUM_TO_STRING_CASE(GL_RGBA16_SNORM)
ENUM_TO_STRING_CASE(GL_RGB4)
ENUM_TO_STRING_CASE(GL_RGB5)
ENUM_TO_STRING_CASE(GL_RGB8)
ENUM_TO_STRING_CASE(GL_RGB10)
ENUM_TO_STRING_CASE(GL_RGB12)
ENUM_TO_STRING_CASE(GL_RGB16)
ENUM_TO_STRING_CASE(GL_RGBA2)
ENUM_TO_STRING_CASE(GL_RGBA4)
ENUM_TO_STRING_CASE(GL_RGB5_A1)
ENUM_TO_STRING_CASE(GL_RGBA8)
ENUM_TO_STRING_CASE(GL_RGB10_A2)
ENUM_TO_STRING_CASE(GL_RGBA12)
ENUM_TO_STRING_CASE(GL_RGBA16)
ENUM_TO_STRING_CASE(GL_RGBA32F)
ENUM_TO_STRING_CASE(GL_RGB32F)
ENUM_TO_STRING_CASE(GL_RGBA16F)
ENUM_TO_STRING_CASE(GL_RGB16F)
ENUM_TO_STRING_CASE(GL_RGBA32UI)
ENUM_TO_STRING_CASE(GL_RGB32UI)
ENUM_TO_STRING_CASE(GL_RGBA16UI)
ENUM_TO_STRING_CASE(GL_RGB16UI)
ENUM_TO_STRING_CASE(GL_RGBA8UI)
ENUM_TO_STRING_CASE(GL_RGB8UI)
ENUM_TO_STRING_CASE(GL_RGBA32I)
ENUM_TO_STRING_CASE(GL_RGB32I)
ENUM_TO_STRING_CASE(GL_RGBA16I)
ENUM_TO_STRING_CASE(GL_RGB16I)
ENUM_TO_STRING_CASE(GL_RGBA8I)
ENUM_TO_STRING_CASE(GL_RGB8I)
ENUM_TO_STRING_CASE(GL_RGB10_A2UI)
ENUM_TO_STRING_CASE(GL_SRGB)
ENUM_TO_STRING_CASE(GL_SRGB8)
ENUM_TO_STRING_CASE(GL_SRGB_ALPHA)
ENUM_TO_STRING_CASE(GL_SRGB8_ALPHA8)
ENUM_TO_STRING_CASE(GL_DEPTH_COMPONENT16)
ENUM_TO_STRING_CASE(GL_DEPTH_COMPONENT24)
ENUM_TO_STRING_CASE(GL_DEPTH_COMPONENT32)
ENUM_TO_STRING_CASE(GL_DEPTH24_STENCIL8)
ENUM_TO_STRING_CASE(GL_R11F_G11F_B10F)
ENUM_TO_STRING_CASE(GL_DEPTH_COMPONENT32F)
ENUM_TO_STRING_CASE(GL_DEPTH32F_STENCIL8)
#endif
default: {
return String("Swapchain format 0x") + String::num_int64(p_swapchain_format, 16);
} break;
}
}
#endif // GLES3_ENABLED
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