void PerspectiveCamera::commit()
{
if (!ospCamera) create();
ospSetVec3f(ospCamera,"pos",from);
ospSetVec3f(ospCamera,"dir",at - from);
ospSetVec3f(ospCamera,"up",up);
ospSetf(ospCamera,"aspect",aspect);
ospSetf(ospCamera,"fovy",fovy);
ospCommit(ospCamera);
}
void GLFWOSPRayWindow::reshape(const ospcommon::vec2i &newWindowSize)
{
windowSize = newWindowSize;
// release the current frame buffer, if it exists
if (framebuffer)
ospRelease(framebuffer);
// create new frame buffer
framebuffer = ospNewFrameBuffer(*reinterpret_cast<osp::vec2i *>(&windowSize),
OSP_FB_SRGBA,
OSP_FB_COLOR | OSP_FB_ACCUM);
// reset OpenGL viewport and orthographic projection
glViewport(0, 0, windowSize.x, windowSize.y);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, windowSize.x, 0.0, windowSize.y, -1.0, 1.0);
// update camera
arcballCamera->updateWindowSize(windowSize);
ospSetf(camera, "aspect", windowSize.x / float(windowSize.y));
ospCommit(camera);
}
void GLFWOSPRayWindow::motion(const ospcommon::vec2f &position)
{
static ospcommon::vec2f previousMouse(-1);
const ospcommon::vec2f mouse(position.x, position.y);
if (previousMouse != ospcommon::vec2f(-1)) {
const bool leftDown =
glfwGetMouseButton(glfwWindow, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS;
const bool rightDown =
glfwGetMouseButton(glfwWindow, GLFW_MOUSE_BUTTON_RIGHT) == GLFW_PRESS;
const bool middleDown =
glfwGetMouseButton(glfwWindow, GLFW_MOUSE_BUTTON_MIDDLE) == GLFW_PRESS;
const ospcommon::vec2f prev = previousMouse;
bool cameraChanged = leftDown || rightDown || middleDown;
if (leftDown) {
const ospcommon::vec2f mouseFrom(
ospcommon::clamp(prev.x * 2.f / windowSize.x - 1.f, -1.f, 1.f),
ospcommon::clamp(prev.y * 2.f / windowSize.y - 1.f, -1.f, 1.f));
const ospcommon::vec2f mouseTo(
ospcommon::clamp(mouse.x * 2.f / windowSize.x - 1.f, -1.f, 1.f),
ospcommon::clamp(mouse.y * 2.f / windowSize.y - 1.f, -1.f, 1.f));
arcballCamera->rotate(mouseFrom, mouseTo);
} else if (rightDown) {
arcballCamera->zoom(mouse.y - prev.y);
} else if (middleDown) {
arcballCamera->pan(ospcommon::vec2f(mouse.x - prev.x, prev.y - mouse.y));
}
if (cameraChanged) {
ospFrameBufferClear(framebuffer, OSP_FB_COLOR | OSP_FB_ACCUM);
ospSetf(camera, "aspect", windowSize.x / float(windowSize.y));
ospSetVec3f(camera,
"pos",
osp::vec3f{arcballCamera->eyePos().x,
arcballCamera->eyePos().y,
arcballCamera->eyePos().z});
ospSetVec3f(camera,
"dir",
osp::vec3f{arcballCamera->lookDir().x,
arcballCamera->lookDir().y,
arcballCamera->lookDir().z});
ospSetVec3f(camera,
"up",
osp::vec3f{arcballCamera->upDir().x,
arcballCamera->upDir().y,
arcballCamera->upDir().z});
ospCommit(camera);
}
}
previousMouse = mouse;
}
GLFWOSPRayWindow::GLFWOSPRayWindow(const ospcommon::vec2i &windowSize,
const ospcommon::box3f &worldBounds,
OSPModel model,
OSPRenderer renderer)
: windowSize(windowSize),
worldBounds(worldBounds),
model(model),
renderer(renderer)
{
if (activeWindow != nullptr)
throw std::runtime_error("Cannot create more than one GLFWOSPRayWindow!");
activeWindow = this;
// initialize GLFW
if (!glfwInit())
throw std::runtime_error("Failed to initialize GLFW!");
// create GLFW window
glfwWindow = glfwCreateWindow(
windowSize.x, windowSize.y, "OSPRay Tutorial", NULL, NULL);
if (!glfwWindow) {
glfwTerminate();
throw std::runtime_error("Failed to create GLFW window!");
}
// make the window's context current
glfwMakeContextCurrent(glfwWindow);
ImGui_ImplGlfwGL3_Init(glfwWindow, true);
// set initial OpenGL state
glEnable(GL_TEXTURE_2D);
glDisable(GL_LIGHTING);
// create OpenGL frame buffer texture
glGenTextures(1, &framebufferTexture);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, framebufferTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// set GLFW callbacks
glfwSetFramebufferSizeCallback(
glfwWindow, [](GLFWwindow *, int newWidth, int newHeight) {
activeWindow->reshape(ospcommon::vec2i{newWidth, newHeight});
});
glfwSetCursorPosCallback(glfwWindow, [](GLFWwindow *, double x, double y) {
ImGuiIO &io = ImGui::GetIO();
if (!io.WantCaptureMouse)
activeWindow->motion(ospcommon::vec2f{float(x), float(y)});
});
glfwSetKeyCallback(glfwWindow,
[](GLFWwindow *, int key, int, int action, int) {
if (action == GLFW_PRESS) {
switch (key) {
case GLFW_KEY_G:
activeWindow->showUi = !(activeWindow->showUi);
break;
}
}
});
// OSPRay setup
// set the model on the renderer
ospSetObject(renderer, "model", model);
// create the arcball camera model
arcballCamera = std::unique_ptr<ArcballCamera>(
new ArcballCamera(worldBounds, windowSize));
// create camera
camera = ospNewCamera("perspective");
ospSetf(camera, "aspect", windowSize.x / float(windowSize.y));
ospSetVec3f(camera,
"pos",
osp::vec3f{arcballCamera->eyePos().x,
arcballCamera->eyePos().y,
arcballCamera->eyePos().z});
ospSetVec3f(camera,
"dir",
osp::vec3f{arcballCamera->lookDir().x,
arcballCamera->lookDir().y,
arcballCamera->lookDir().z});
ospSetVec3f(camera,
"up",
osp::vec3f{arcballCamera->upDir().x,
arcballCamera->upDir().y,
arcballCamera->upDir().z});
ospCommit(camera);
// set camera on the renderer
ospSetObject(renderer, "camera", camera);
// finally, commit the renderer
ospCommit(renderer);
// trigger window reshape events with current window size
glfwGetFramebufferSize(glfwWindow, &this->windowSize.x, &this->windowSize.y);
reshape(this->windowSize);
}
int main(int ac, const char **av) {
// image size
osp_vec2i imgSize;
imgSize.x = 1024; // width
imgSize.y = 768; // height
// camera
float cam_pos[] = {0.f, 0.f, 0.f};
float cam_up [] = {0.f, 1.f, 0.f};
float cam_view [] = {0.1f, 0.f, 1.f};
// triangle mesh data
float vertex[] = { -1.0f, -1.0f, 3.0f, 0.f,
-1.0f, 1.0f, 3.0f, 0.f,
1.0f, -1.0f, 3.0f, 0.f,
0.1f, 0.1f, 0.3f, 0.f };
float color[] = { 0.9f, 0.5f, 0.5f, 1.0f,
0.8f, 0.8f, 0.8f, 1.0f,
0.8f, 0.8f, 0.8f, 1.0f,
0.5f, 0.9f, 0.5f, 1.0f };
int32_t index[] = { 0, 1, 2,
1, 2, 3 };
// initialize OSPRay; OSPRay parses (and removes) its commandline parameters, e.g. "--osp:debug"
ospInit(&ac, av);
// create and setup camera
OSPCamera camera = ospNewCamera("perspective");
ospSetf(camera, "aspect", imgSize.x/(float)imgSize.y);
ospSet3fv(camera, "pos", cam_pos);
ospSet3fv(camera, "dir", cam_view);
ospSet3fv(camera, "up", cam_up);
ospCommit(camera); // commit each object to indicate modifications are done
// create and setup model and mesh
OSPGeometry mesh = ospNewGeometry("triangles");
OSPData data = ospNewData(4, OSP_FLOAT3A, vertex, 0); // OSP_FLOAT3 format is also supported for vertex positions (currently not on MIC)
ospCommit(data);
ospSetData(mesh, "vertex", data);
data = ospNewData(4, OSP_FLOAT4, color, 0);
ospCommit(data);
ospSetData(mesh, "vertex.color", data);
data = ospNewData(2, OSP_INT3, index, 0); // OSP_INT4 format is also supported for triangle indices
ospCommit(data);
ospSetData(mesh, "index", data);
ospCommit(mesh);
OSPModel world = ospNewModel();
ospAddGeometry(world, mesh);
ospCommit(world);
// create and setup renderer
OSPRenderer renderer = ospNewRenderer("scivis"); // choose Scientific Visualization renderer
ospSet1f(renderer, "aoWeight", 1.0f); // with full Ambient Occlusion
ospSet1i(renderer, "aoSamples", 1);
ospSetObject(renderer, "model", world);
ospSetObject(renderer, "camera", camera);
ospCommit(renderer);
// create and setup framebuffer
OSPFrameBuffer framebuffer = ospNewFrameBuffer(&imgSize, OSP_FB_SRGBA, OSP_FB_COLOR | /*OSP_FB_DEPTH |*/ OSP_FB_ACCUM);
ospFrameBufferClear(framebuffer, OSP_FB_COLOR | OSP_FB_ACCUM);
// render one frame
ospRenderFrame(framebuffer, renderer, OSP_FB_COLOR | OSP_FB_ACCUM);
// access framebuffer and write its content as PPM file
const uint32_t * fb = (uint32_t*)ospMapFrameBuffer(framebuffer, OSP_FB_COLOR);
writePPM("firstFrameC.ppm", &imgSize, fb);
ospUnmapFrameBuffer(fb, framebuffer);
// render 10 more frames, which are accumulated to result in a better converged image
for (int frames = 0; frames < 10; frames++)
ospRenderFrame(framebuffer, renderer, OSP_FB_COLOR | OSP_FB_ACCUM);
fb = (uint32_t*)ospMapFrameBuffer(framebuffer, OSP_FB_COLOR);
writePPM("accumulatedFrameC.ppm", &imgSize, fb);
ospUnmapFrameBuffer(fb, framebuffer);
return 0;
}
