ba60918eaa
Now GLFW3 windows/context creation works ok and a sample red rectangle has been drawn using rlgl. Next step is working in tracking position/orientation maths and try to get a simple 3d scene...
505 lines
19 KiB
C
505 lines
19 KiB
C
/*******************************************************************************************
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*
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* raylib Oculus minimum sample (OpenGL 3.3 Core)
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*
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* NOTE: This example requires raylib module [rlgl]
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*
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* Compile rlgl using:
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* gcc -c rlgl.c -Wall -std=c99 -DRLGL_STANDALONE -DRAYMATH_IMPLEMENTATION -DGRAPHICS_API_OPENGL_33
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*
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* Compile example using:
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* gcc -o oculus_glfw_sample.exe oculus_glfw_sample.c rlgl.o glad.o -L. -lLibOVRRT32_1 -lglfw3 -lopengl32 -lgdi32 -std=c99
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*
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* This example has been created using raylib 1.5 (www.raylib.com)
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* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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*
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* Copyright (c) 2015 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include "glad.h" // Extensions loading library
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#include <GLFW/glfw3.h> // Windows/Context and inputs management
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#include "OculusSDK/LibOVR/Include/OVR_CAPI_GL.h" // Oculus SDK for OpenGL
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#define RLGL_STANDALONE
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#include "rlgl.h"
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// OVR device variables
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ovrSession session;
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ovrHmdDesc hmdDesc;
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ovrGraphicsLuid luid;
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// OVR OpenGL required variables
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GLuint fbo = 0;
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GLuint depthBuffer = 0;
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ovrTextureSwapChain eyeTexture;
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GLuint mirrorFbo = 0;
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ovrMirrorTexture mirrorTexture;
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ovrEyeRenderDesc eyeRenderDescs[2];
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Matrix eyeProjections[2];
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ovrLayerEyeFov eyeLayer;
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ovrViewScaleDesc viewScaleDesc;
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Vector2 renderTargetSize = { 0, 0 };
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Vector2 mirrorSize;
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unsigned int frame = 0;
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// GLFW variables
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GLFWwindow *window = NULL;
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//----------------------------------------------------------------------------------
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// Types and Structures Definition
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//----------------------------------------------------------------------------------
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typedef enum { LOG_INFO = 0, LOG_ERROR, LOG_WARNING, LOG_DEBUG, LOG_OTHER } TraceLogType;
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//----------------------------------------------------------------------------------
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// Module specific Functions Declaration
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//----------------------------------------------------------------------------------
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static void ErrorCallback(int error, const char* description)
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{
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fputs(description, stderr);
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}
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static void KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
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{
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if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
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{
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glfwSetWindowShouldClose(window, GL_TRUE);
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}
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}
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static void DrawRectangleV(Vector2 position, Vector2 size, Color color);
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static void TraceLog(int msgType, const char *text, ...);
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static Matrix FromOvrMatrix(ovrMatrix4f ovrM);
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void DrawGrid(int slices, float spacing);
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void DrawCube(Vector3 position, float width, float height, float length, Color color);
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//----------------------------------------------------------------------------------
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// Main Entry point
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//----------------------------------------------------------------------------------
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int main()
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{
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ovrResult result = ovr_Initialize(NULL);
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if (OVR_FAILURE(result)) TraceLog(LOG_ERROR, "OVR: Could not initialize Oculus device");
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result = ovr_Create(&session, &luid);
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if (OVR_FAILURE(result))
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{
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TraceLog(LOG_WARNING, "OVR: Could not create Oculus session");
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ovr_Shutdown();
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}
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hmdDesc = ovr_GetHmdDesc(session);
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TraceLog(LOG_INFO, "OVR: Product Name: %s", hmdDesc.ProductName);
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TraceLog(LOG_INFO, "OVR: Manufacturer: %s", hmdDesc.Manufacturer);
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TraceLog(LOG_INFO, "OVR: Product ID: %i", hmdDesc.ProductId);
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TraceLog(LOG_INFO, "OVR: Product Type: %i", hmdDesc.Type);
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TraceLog(LOG_INFO, "OVR: Serian Number: %s", hmdDesc.SerialNumber);
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TraceLog(LOG_INFO, "OVR: Resolution: %ix%i", hmdDesc.Resolution.w, hmdDesc.Resolution.h);
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viewScaleDesc.HmdSpaceToWorldScaleInMeters = 1.0f;
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memset(&eyeLayer, 0, sizeof(ovrLayerEyeFov));
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eyeLayer.Header.Type = ovrLayerType_EyeFov;
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eyeLayer.Header.Flags = ovrLayerFlag_TextureOriginAtBottomLeft;
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for (int eye = 0; eye < 2; eye++)
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{
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eyeRenderDescs[eye] = ovr_GetRenderDesc(session, eye, hmdDesc.DefaultEyeFov[eye]);
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ovrMatrix4f ovrPerspectiveProjection = ovrMatrix4f_Projection(eyeRenderDescs[eye].Fov, 0.01f, 1000.0f, ovrProjection_ClipRangeOpenGL);
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// NOTE struct ovrMatrix4f { float M[4][4] }
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eyeProjections[eye] = FromOvrMatrix(ovrPerspectiveProjection);
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viewScaleDesc.HmdToEyeOffset[eye] = eyeRenderDescs[eye].HmdToEyeOffset;
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eyeLayer.Fov[eye] = eyeRenderDescs[eye].Fov;
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ovrSizei eyeSize = ovr_GetFovTextureSize(session, eye, eyeLayer.Fov[eye], 1.0f);
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eyeLayer.Viewport[eye].Size = eyeSize;
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eyeLayer.Viewport[eye].Pos.x = renderTargetSize.x;
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eyeLayer.Viewport[eye].Pos.y = 0;
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renderTargetSize.y = eyeSize.h; //std::max(renderTargetSize.y, (uint32_t)eyeSize.h);
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renderTargetSize.x += eyeSize.w;
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}
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// Make the on screen window 1/2 the resolution of the device
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mirrorSize.x = hmdDesc.Resolution.w/2;
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mirrorSize.y = hmdDesc.Resolution.h/2;
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// GLFW3 Initialization + OpenGL 3.3 Context + Extensions
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//--------------------------------------------------------
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if (!glfwInit())
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{
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TraceLog(LOG_WARNING, "GLFW3: Can not initialize GLFW");
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exit(EXIT_FAILURE);
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}
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else TraceLog(LOG_INFO, "GLFW3: GLFW initialized successfully");
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glfwWindowHint(GLFW_DEPTH_BITS, 16);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);
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//glfwWindowHint(GLFW_DECORATED, GL_FALSE); // Mandatory on Oculus Rift to avoid program crash? --> NO
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window = glfwCreateWindow(mirrorSize.x, mirrorSize.y, "raylib oculus sample", NULL, NULL);
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if (!window)
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{
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glfwTerminate();
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exit(EXIT_FAILURE);
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}
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else TraceLog(LOG_INFO, "GLFW3: Window created successfully");
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glfwSetErrorCallback(ErrorCallback);
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glfwSetKeyCallback(window, KeyCallback);
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glfwMakeContextCurrent(window);
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glfwSwapInterval(0);
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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
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{
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TraceLog(LOG_WARNING, "GLAD: Cannot load OpenGL extensions");
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exit(1);
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}
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else TraceLog(LOG_INFO, "GLAD: OpenGL extensions loaded successfully");
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// Initialize OVR OpenGL swap chain textures
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ovrTextureSwapChainDesc desc = {};
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desc.Type = ovrTexture_2D;
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desc.ArraySize = 1;
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desc.Width = renderTargetSize.x;
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desc.Height = renderTargetSize.y;
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desc.MipLevels = 1;
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desc.Format = OVR_FORMAT_R8G8B8A8_UNORM_SRGB;
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desc.SampleCount = 1;
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desc.StaticImage = ovrFalse;
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result = ovr_CreateTextureSwapChainGL(session, &desc, &eyeTexture);
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eyeLayer.ColorTexture[0] = eyeTexture;
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if (!OVR_SUCCESS(result)) TraceLog(LOG_WARNING, "Failed to create swap textures");
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int length = 0;
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result = ovr_GetTextureSwapChainLength(session, eyeTexture, &length);
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if (!OVR_SUCCESS(result) || !length) TraceLog(LOG_WARNING, "Unable to count swap chain textures");
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for (int i = 0; i < length; ++i)
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{
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GLuint chainTexId;
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ovr_GetTextureSwapChainBufferGL(session, eyeTexture, i, &chainTexId);
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glBindTexture(GL_TEXTURE_2D, chainTexId);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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}
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glBindTexture(GL_TEXTURE_2D, 0);
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// Setup framebuffer object
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glGenFramebuffers(1, &fbo);
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glGenRenderbuffers(1, &depthBuffer);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
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glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, renderTargetSize.x, renderTargetSize.y);
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glBindRenderbuffer(GL_RENDERBUFFER, 0);
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glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuffer);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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// Setup mirror texture
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ovrMirrorTextureDesc mirrorDesc;
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memset(&mirrorDesc, 0, sizeof(mirrorDesc));
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mirrorDesc.Format = OVR_FORMAT_R8G8B8A8_UNORM_SRGB;
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mirrorDesc.Width = mirrorSize.x;
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mirrorDesc.Height = mirrorSize.y;
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if (!OVR_SUCCESS(ovr_CreateMirrorTextureGL(session, &mirrorDesc, &mirrorTexture))) TraceLog(LOG_WARNING, "Could not create mirror texture");
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glGenFramebuffers(1, &mirrorFbo);
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// Recenter OVR tracking origin
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ovr_RecenterTrackingOrigin(session);
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// Initialize rlgl internal buffers and OpenGL state
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rlglInit();
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rlglInitGraphics(0, 0, mirrorSize.x, mirrorSize.y);
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rlClearColor(245, 245, 245, 255); // Define clear color
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glEnable(GL_DEPTH_TEST);
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Vector2 position = { mirrorSize.x/2 - 100, mirrorSize.y/2 - 100 };
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Vector2 size = { 200, 200 };
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Color color = { 180, 20, 20, 255 };
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Vector3 cubePosition = { 0.0f, 0.0f, 0.0f };
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while (!glfwWindowShouldClose(window))
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{
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// Update
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//----------------------------------------------------------------------------------
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frame++;
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ovrPosef eyePoses[2];
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ovr_GetEyePoses(session, frame, ovrTrue, viewScaleDesc.HmdToEyeOffset, eyePoses, &eyeLayer.SensorSampleTime);
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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int curIndex;
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ovr_GetTextureSwapChainCurrentIndex(session, eyeTexture, &curIndex);
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GLuint curTexId;
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ovr_GetTextureSwapChainBufferGL(session, eyeTexture, curIndex, &curTexId);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
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glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, curTexId, 0);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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for (int eye = 0; eye < 2; eye++)
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{
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glViewport(eyeLayer.Viewport[eye].Pos.x, eyeLayer.Viewport[eye].Pos.y,
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eyeLayer.Viewport[eye].Size.w, eyeLayer.Viewport[eye].Size.h);
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eyeLayer.RenderPose[eye] = eyePoses[eye];
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// Convert struct ovrPosef { ovrQuatf Orientation; ovrVector3f Position; } to Matrix
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// TODO: Review maths!
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Matrix eyeOrientation = QuaternionToMatrix((Quaternion){ -eyePoses[eye].Orientation.x, -eyePoses[eye].Orientation.y, -eyePoses[eye].Orientation.z, -eyePoses[eye].Orientation.w });
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Matrix eyePosition = MatrixTranslate(-eyePoses[eye].Position.x, -eyePoses[eye].Position.y, -eyePoses[eye].Position.z);
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Matrix mvp = MatrixMultiply(eyeProjections[eye], MatrixMultiply(eyeOrientation, eyePosition));
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// NOTE: Nothing is drawn until rlglDraw()
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DrawRectangleV(position, size, color);
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//DrawCube(cubePosition, 2.0f, 2.0f, 2.0f, color);
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//DrawGrid(10, 1.0f);
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// NOTE: rlglDraw() must be modified to support an external modelview-projection matrix
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// TODO: Still working on it (now uses internal mvp)
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rlglDraw(mvp);
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}
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glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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ovr_CommitTextureSwapChain(session, eyeTexture);
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ovrLayerHeader *headerList = &eyeLayer.Header;
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ovr_SubmitFrame(session, frame, &viewScaleDesc, &headerList, 1);
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// Blit mirror texture to back buffer
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GLuint mirrorTextureId;
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ovr_GetMirrorTextureBufferGL(session, mirrorTexture, &mirrorTextureId);
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glBindFramebuffer(GL_READ_FRAMEBUFFER, mirrorFbo);
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glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mirrorTextureId, 0);
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glBlitFramebuffer(0, 0, mirrorSize.x, mirrorSize.y, 0, mirrorSize.y, mirrorSize.x, 0, GL_COLOR_BUFFER_BIT, GL_NEAREST);
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glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
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glfwSwapBuffers(window);
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glfwPollEvents();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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if (mirrorFbo) glDeleteFramebuffers(1, &mirrorFbo);
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if (mirrorTexture) ovr_DestroyMirrorTexture(session, mirrorTexture);
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if (fbo) glDeleteFramebuffers(1, &fbo);
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if (depthBuffer) glDeleteTextures(1, &depthBuffer);
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if (eyeTexture) ovr_DestroyTextureSwapChain(session, eyeTexture);
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rlglClose();
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glfwDestroyWindow(window);
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glfwTerminate();
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ovr_Destroy(session); // Must be called after glfwTerminate()
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ovr_Shutdown();
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//--------------------------------------------------------------------------------------
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return 0;
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}
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//----------------------------------------------------------------------------------
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// Module specific Functions Definitions
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//----------------------------------------------------------------------------------
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// Draw rectangle using rlgl OpenGL 1.1 style coding (translated to OpenGL 3.3 internally)
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static void DrawRectangleV(Vector2 position, Vector2 size, Color color)
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{
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rlBegin(RL_TRIANGLES);
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rlColor4ub(color.r, color.g, color.b, color.a);
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rlVertex2i(position.x, position.y);
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rlVertex2i(position.x, position.y + size.y);
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rlVertex2i(position.x + size.x, position.y + size.y);
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rlVertex2i(position.x, position.y);
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rlVertex2i(position.x + size.x, position.y + size.y);
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rlVertex2i(position.x + size.x, position.y);
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rlEnd();
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}
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// Output a trace log message
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// NOTE: Expected msgType: (0)Info, (1)Error, (2)Warning
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static void TraceLog(int msgType, const char *text, ...)
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{
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va_list args;
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va_start(args, text);
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switch(msgType)
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{
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case LOG_INFO: fprintf(stdout, "INFO: "); break;
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case LOG_ERROR: fprintf(stdout, "ERROR: "); break;
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case LOG_WARNING: fprintf(stdout, "WARNING: "); break;
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case LOG_DEBUG: fprintf(stdout, "DEBUG: "); break;
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default: break;
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}
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vfprintf(stdout, text, args);
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fprintf(stdout, "\n");
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va_end(args);
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//if (msgType == LOG_ERROR) exit(1);
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}
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static Matrix FromOvrMatrix(ovrMatrix4f ovrmat)
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{
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Matrix rmat;
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rmat.m0 = ovrmat.M[0][0];
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rmat.m1 = ovrmat.M[1][0];
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rmat.m2 = ovrmat.M[2][0];
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rmat.m3 = ovrmat.M[3][0];
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rmat.m4 = ovrmat.M[0][1];
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rmat.m5 = ovrmat.M[1][1];
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rmat.m6 = ovrmat.M[2][1];
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rmat.m7 = ovrmat.M[3][1];
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rmat.m8 = ovrmat.M[0][2];
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rmat.m9 = ovrmat.M[1][2];
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rmat.m10 = ovrmat.M[2][2];
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rmat.m11 = ovrmat.M[3][2];
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rmat.m12 = ovrmat.M[0][3];
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rmat.m13 = ovrmat.M[1][3];
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rmat.m14 = ovrmat.M[2][3];
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rmat.m15 = ovrmat.M[3][3];
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//MatrixTranspose(&rmat);
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return rmat;
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}
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// Draw cube
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// NOTE: Cube position is the center position
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void DrawCube(Vector3 position, float width, float height, float length, Color color)
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{
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float x = 0.0f;
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float y = 0.0f;
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float z = 0.0f;
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rlPushMatrix();
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// NOTE: Be careful! Function order matters (rotate -> scale -> translate)
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rlTranslatef(position.x, position.y, position.z);
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//rlScalef(2.0f, 2.0f, 2.0f);
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//rlRotatef(45, 0, 1, 0);
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rlBegin(RL_TRIANGLES);
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rlColor4ub(color.r, color.g, color.b, color.a);
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// Front Face -----------------------------------------------------
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rlVertex3f(x-width/2, y-height/2, z+length/2); // Bottom Left
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rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
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rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
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rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Right
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rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
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rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
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// Back Face ------------------------------------------------------
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rlVertex3f(x-width/2, y-height/2, z-length/2); // Bottom Left
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rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
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rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
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rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right
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rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
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rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
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// Top Face -------------------------------------------------------
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rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
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rlVertex3f(x-width/2, y+height/2, z+length/2); // Bottom Left
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rlVertex3f(x+width/2, y+height/2, z+length/2); // Bottom Right
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rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Bottom Right
|
|
|
|
// Bottom Face ----------------------------------------------------
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Top Left
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
|
|
rlVertex3f(x-width/2, y-height/2, z+length/2); // Bottom Left
|
|
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Top Right
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Top Left
|
|
|
|
// Right face -----------------------------------------------------
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Left
|
|
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Left
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Left
|
|
|
|
// Left Face ------------------------------------------------------
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Right
|
|
|
|
rlVertex3f(x-width/2, y-height/2, z+length/2); // Bottom Left
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlEnd();
|
|
rlPopMatrix();
|
|
}
|
|
|
|
// Draw a grid centered at (0, 0, 0)
|
|
void DrawGrid(int slices, float spacing)
|
|
{
|
|
int halfSlices = slices / 2;
|
|
|
|
rlBegin(RL_LINES);
|
|
for(int i = -halfSlices; i <= halfSlices; i++)
|
|
{
|
|
if (i == 0)
|
|
{
|
|
rlColor3f(0.5f, 0.5f, 0.5f);
|
|
rlColor3f(0.5f, 0.5f, 0.5f);
|
|
rlColor3f(0.5f, 0.5f, 0.5f);
|
|
rlColor3f(0.5f, 0.5f, 0.5f);
|
|
}
|
|
else
|
|
{
|
|
rlColor3f(0.75f, 0.75f, 0.75f);
|
|
rlColor3f(0.75f, 0.75f, 0.75f);
|
|
rlColor3f(0.75f, 0.75f, 0.75f);
|
|
rlColor3f(0.75f, 0.75f, 0.75f);
|
|
}
|
|
|
|
rlVertex3f((float)i*spacing, 0.0f, (float)-halfSlices*spacing);
|
|
rlVertex3f((float)i*spacing, 0.0f, (float)halfSlices*spacing);
|
|
|
|
rlVertex3f((float)-halfSlices*spacing, 0.0f, (float)i*spacing);
|
|
rlVertex3f((float)halfSlices*spacing, 0.0f, (float)i*spacing);
|
|
}
|
|
rlEnd();
|
|
}
|