matrixfurry.com
The open source OpenXR runtime
st/gui: Refactor a few OpenGL drawing code into helper
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-59
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src/xrt/state_trackers/gui/CMakeLists.txt
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src/xrt/state_trackers/gui/CMakeLists.txt
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src/xrt/state_trackers/gui/gui_ogl.c
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src/xrt/state_trackers/gui/gui_ogl.c
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// Copyright 2019-2023, Collabora, Ltd.
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// SPDX-License-Identifier: BSL-1.0
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/*!
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* @file
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* @brief OpenGL helper functions for drawing GUI elements.
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* @author Jakob Bornecrantz <jakob@collabora.com>
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* @author Moses Turner <moses@collabora.com>
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* @ingroup gui
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*/
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#include "math/m_api.h"
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#include "gui_ogl.h"
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#include "gui_imgui.h"
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/*
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*
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* Helpers.
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*
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*/
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static void
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get_uvs(ImVec2 *uv0, ImVec2 *uv1, bool rotate_180, bool flip_y)
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{
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// Flip direction of y (x) if we are rotating.
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float u0 = rotate_180 ? 1.f : 0.f;
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float u1 = rotate_180 ? 0.f : 1.f;
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// Flip direction of v (y) if either flip_y or rotate_180 is true.
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float v0 = (rotate_180 ^ flip_y) ? 1.f : 0.f;
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float v1 = (rotate_180 ^ flip_y) ? 0.f : 1.f;
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// Note: We can't easily do 90 or 270-degree rotations: https://github.com/ocornut/imgui/issues/3267
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*uv0 = (ImVec2){u0, v0};
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*uv1 = (ImVec2){u1, v1};
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}
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/*
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*
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* 'Exported' functions.
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*
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*/
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void
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gui_ogl_draw_image(uint32_t width, uint32_t height, uint32_t tex_id, float scale, bool rotate_180, bool flip_y)
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{
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ImVec2 uv0, uv1;
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get_uvs(&uv0, &uv1, rotate_180, flip_y);
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// Need to go via ints to get integer steps.
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int w = (float)width * scale;
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int h = (float)height * scale;
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ImVec2 size = {(float)w, (float)h};
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ImVec4 white = {1, 1, 1, 1};
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ImVec4 black = {0, 0, 0, 1};
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ImTextureID id = (ImTextureID)(intptr_t)tex_id;
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igImageBg(id, size, uv0, uv1, white, white, black);
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}
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void
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gui_ogl_draw_background(uint32_t width, uint32_t height, uint32_t tex_id, bool rotate_180, bool flip_y)
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{
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ImVec2 uv0, uv1;
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get_uvs(&uv0, &uv1, rotate_180, flip_y);
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const ImU32 white = 0xffffffff;
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ImTextureID id = (ImTextureID)(intptr_t)tex_id;
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ImGuiIO *io = igGetIO();
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float in_w = (float)width;
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float in_h = (float)height;
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float out_w = io->DisplaySize.x;
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float out_h = io->DisplaySize.y;
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float scale_w = (float)out_w / in_w; // 128 / 1280 = 0.1
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float scale_h = (float)out_h / in_h; // 128 / 800 = 0.16
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float scale = MIN(scale_w, scale_h); // 0.1
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float inside_w = in_w * scale;
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float inside_h = in_h * scale;
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float translate_x = (out_w - inside_w) / 2; // Should be 0 for 1280x800
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float translate_y = (out_h - inside_h) / 2; // Should be (1280 - 800) / 2 = 240
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ImVec2 p_min = {translate_x, translate_y};
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ImVec2 p_max = {translate_x + inside_w, translate_y + inside_h};
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ImDrawList *bg = igGetBackgroundDrawList();
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ImDrawList_AddImage(bg, id, p_min, p_max, uv0, uv1, white);
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}
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src/xrt/state_trackers/gui/gui_ogl.h
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src/xrt/state_trackers/gui/gui_ogl.h
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// Copyright 2019-2023, Collabora, Ltd.
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// SPDX-License-Identifier: BSL-1.0
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/*!
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* @file
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* @brief OpenGL helper functions for drawing GUI elements.
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* @author Jakob Bornecrantz <jakob@collabora.com>
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* @ingroup gui
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*/
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#pragma once
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#include "xrt/xrt_compiler.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*!
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* Draw the given textures as igImage, scale of 1.0f == 100%.
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*
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* @ingroup gui
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*/
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void
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gui_ogl_draw_image(uint32_t width, uint32_t height, uint32_t tex_id, float scale, bool rotate_180, bool flip_y);
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/*!
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* Draw the given texture to the background of the current OS window.
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*
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* @ingroup gui
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*/
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void
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gui_ogl_draw_background(uint32_t width, uint32_t height, uint32_t tex_id, bool rotate_180, bool flip_y);
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#ifdef __cplusplus
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}
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#endif
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src/xrt/state_trackers/gui/gui_scene_calibrate.c
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src/xrt/state_trackers/gui/gui_scene_calibrate.c
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#include "gui_common.h"
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#include "gui_imgui.h"
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#include "gui_ogl.h"
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#include <assert.h>
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···
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gui_ogl_sink_update(tex);
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int w = tex->w / (tex->half ? 2 : 1);
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int h = tex->h / (tex->half ? 2 : 1);
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gui_ogl_draw_image( //
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(uint32_t)tex->w, // width
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(uint32_t)tex->h, // height
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tex->id, // tex_id
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tex->half ? 0.5f : 1.0f, // scale
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false, // rotate_180
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false); // flip_y
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ImVec2 size = {(float)w, (float)h};
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ImVec2 uv0 = {0, 0};
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ImVec2 uv1 = {1, 1};
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ImVec4 white = {1, 1, 1, 1};
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ImTextureID id = (ImTextureID)(intptr_t)tex->id;
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igImage(id, size, uv0, uv1, white, white);
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igText("Sequence %u", (uint32_t)tex->seq);
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char temp[512];
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src/xrt/state_trackers/gui/gui_window_record.c
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src/xrt/state_trackers/gui/gui_window_record.c
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#include "gstreamer/gst_pipeline.h"
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#endif
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#include "gui_ogl.h"
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#include "gui_imgui.h"
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#include "gui_common.h"
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#include "gui_window_record.h"
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gui_ogl_sink_update(tex);
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ImVec2 uv0 = {0, 0};
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ImVec2 uv1 = {1, 1};
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// Note: We can't easily do 90 or 270-degree rotations: https://github.com/ocornut/imgui/issues/3267
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if (rw->texture.rotate_180) {
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uv0 = (ImVec2){1, 1};
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uv1 = (ImVec2){0, 0};
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}
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const ImU32 white = 0xffffffff;
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ImTextureID id = (ImTextureID)(intptr_t)tex->id;
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ImGuiIO *io = igGetIO();
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// Shamelessly stolen from hg_model.cpp
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float in_w = tex->w;
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float in_h = tex->h;
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float out_w = io->DisplaySize.x;
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float out_h = io->DisplaySize.y;
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float scale_w = (float)out_w / in_w; // 128 / 1280 = 0.1
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float scale_h = (float)out_h / in_h; // 128 / 800 = 0.16
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float scale = MIN(scale_w, scale_h); // 0.1
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float inside_w = in_w * scale;
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float inside_h = in_h * scale;
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float translate_x = (out_w - inside_w) / 2; // Should be 0 for 1280x800
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float translate_y = (out_h - inside_h) / 2; // Should be (1280 - 800) / 2 = 240
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ImVec2 p_min = {translate_x, translate_y};
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ImVec2 p_max = {translate_x + inside_w, translate_y + inside_h};
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ImDrawList *bg = igGetBackgroundDrawList();
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ImDrawList_AddImage(bg, id, p_min, p_max, uv0, uv1, white);
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gui_ogl_draw_background( //
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(uint32_t)tex->w, // width
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(uint32_t)tex->h, // height
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tex->id, // tex_id
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rw->texture.rotate_180, // rotate_180
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false); // flip_y
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}
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void
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struct gui_ogl_texture *tex = rw->texture.ogl;
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int w = tex->w * rw->texture.scale / 100.0f;
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int h = tex->h * rw->texture.scale / 100.0f;
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ImVec2 size = {(float)w, (float)h};
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ImVec2 uv0 = {0, 0};
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ImVec2 uv1 = {1, 1};
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// Note: We can't easily do 90 or 270-degree rotations: https://github.com/ocornut/imgui/issues/3267
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if (rw->texture.rotate_180) {
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uv0 = (ImVec2){1, 1};
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uv1 = (ImVec2){0, 0};
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}
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gui_ogl_draw_image( //
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(uint32_t)tex->w, // width
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(uint32_t)tex->h, // height
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tex->id, // tex_id
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rw->texture.scale / 100.0f, // scale
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rw->texture.rotate_180, // rotate_180
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false); // flip_y
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ImVec4 white = {1, 1, 1, 1};
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ImTextureID id = (ImTextureID)(intptr_t)tex->id;
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igImage(id, size, uv0, uv1, white, white);
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#ifdef XRT_HAVE_GST
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draw_gst(rw);