Function DoUI

demo/main.cpp:1651–1902

returns the new scene if one is selected

// returns the new scene if one is selected
int DoUI()
{
	// gui may set a new scene
	int newScene = -1;

	if (g_showHelp)
	{
		const int numParticles = NvFlexGetActiveCount(g_flex);
		const int numDiffuse = NvFlexGetDiffuseParticles(g_flex, NULL, NULL, NULL);

		int x = g_screenWidth - 200;
		int y = g_screenHeight - 23;

		// imgui
		unsigned char button = 0;
		if (g_lastb == SDL_BUTTON_LEFT)
			button = IMGUI_MBUT_LEFT;
		else if (g_lastb == SDL_BUTTON_RIGHT)
			button = IMGUI_MBUT_RIGHT;

		imguiBeginFrame(g_lastx, g_screenHeight - g_lasty, button, 0);

		x += 180;

		int fontHeight = 13;

		if (1)
		{
			DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Frame: %d", g_frame); y -= fontHeight * 2;

			if (!g_ffmpeg)
			{
				DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Frame Time: %.2fms", g_realdt*1000.0f); y -= fontHeight * 2;

				// If detailed profiling is enabled, then these timers will contain the overhead of the detail timers, so we won't display them.
				if (!g_profile)
				{
					DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Sim Time (CPU): %.2fms", g_updateTime*1000.0f); y -= fontHeight;
					DrawImguiString(x, y, Vec3(0.97f, 0.59f, 0.27f), IMGUI_ALIGN_RIGHT, "Sim Latency (GPU): %.2fms", g_simLatency); y -= fontHeight * 2;
				}
				else
				{
					y -= fontHeight * 3;
				}
			}

			DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Particle Count: %d", numParticles); y -= fontHeight;
			DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Diffuse Count: %d", numDiffuse); y -= fontHeight;
			DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Rigid Count: %d", g_buffers->rigidOffsets.size() > 0 ? g_buffers->rigidOffsets.size() - 1 : 0); y -= fontHeight;
			DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Spring Count: %d", g_buffers->springLengths.size()); y -= fontHeight;
			DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Num Substeps: %d", g_numSubsteps); y -= fontHeight;
			DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Num Iterations: %d", g_params.numIterations); y -= fontHeight * 2;

			DrawImguiString(x, y, Vec3(1.0f), IMGUI_ALIGN_RIGHT, "Device: %s", g_deviceName); y -= fontHeight * 2;
		}

		if (g_profile)
		{