[OGRE 1.x] Uniform buffer shader support

examples/custom_shaders_uniforms/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10.2 FATAL_ERROR)
+project(ignition-rendering-custom_shaders_uniforms)
+
+include_directories(SYSTEM
+  ${PROJECT_BINARY_DIR}
+)
+
+find_package(ignition-rendering4)
+
+find_package(GLUT REQUIRED)
+include_directories(SYSTEM ${GLUT_INCLUDE_DIRS})
+link_directories(${GLUT_LIBRARY_DIRS})
+
+find_package(OpenGL REQUIRED)
+include_directories(SYSTEM ${OpenGL_INCLUDE_DIRS})
+link_directories(${OpenGL_LIBRARY_DIRS})
+
+if (NOT APPLE)
+  find_package(GLEW REQUIRED)
+  include_directories(SYSTEM ${GLEW_INCLUDE_DIRS})
+  link_directories(${GLEW_LIBRARY_DIRS})
+endif()
+
+configure_file (example_config.hh.in ${PROJECT_BINARY_DIR}/example_config.hh)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-deprecated-declarations")
+
+add_executable(custom_shaders_uniforms Main.cc GlutWindow.cc)
+
+target_link_libraries(custom_shaders_uniforms
+  ${GLUT_LIBRARIES}
+  ${OPENGL_LIBRARIES}
+  ${GLEW_LIBRARIES}
+  ${IGNITION-RENDERING_LIBRARIES}
+)
+
+add_custom_command(TARGET custom_shaders_uniforms POST_BUILD
+  COMMAND ${CMAKE_COMMAND} -E copy_directory
+  ${CMAKE_SOURCE_DIR}/media
+  $<TARGET_FILE_DIR:custom_shaders_uniforms>/media)

examples/custom_shaders_uniforms/GlutWindow.cc

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+/*
+ * Copyright (C) 2021 Open Source Robotics Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#if __APPLE__
+  #include <OpenGL/gl.h>
+  #include <OpenGL/OpenGL.h>
+  #include <GLUT/glut.h>
+#else
+  #include <GL/glew.h>
+  #include <GL/gl.h>
+  #include <GL/glut.h>
+#endif
+
+#if !defined(__APPLE__) && !defined(_WIN32)
+  #include <GL/glx.h>
+#endif
+
+#include <mutex>
+
+#include <ignition/common/Console.hh>
+#include <ignition/rendering.hh>
+#include <ignition/rendering/Camera.hh>
+#include <ignition/rendering/Image.hh>
+#include <ignition/rendering/Scene.hh>
+
+#include "GlutWindow.hh"
+
+#define KEY_ESC 27
+#define KEY_TAB  9
+
+//////////////////////////////////////////////////
+unsigned int imgw = 0;
+unsigned int imgh = 0;
+
+std::vector<ir::CameraPtr> g_cameras;
+ir::CameraPtr g_camera;
+ir::CameraPtr g_currCamera;
+unsigned int g_cameraIndex = 0;
+ir::ImagePtr g_image;
+ir::ShaderParamsPtr g_shaderParams;
+
+bool g_initContext = false;
+
+#if __APPLE__
+  CGLContextObj g_context;
+  CGLContextObj g_glutContext;
+#elif _WIN32
+#else
+  GLXContext g_context;
+  Display *g_display;
+  GLXDrawable g_drawable;
+  GLXContext g_glutContext;
+  Display *g_glutDisplay;
+  GLXDrawable g_glutDrawable;
+#endif
+
+double g_offset = 0.0;
+
+int g_seed[1] = {0};
+float g_resolution[2] = {400, 200};
+float g_color[3] = {1.0, 1.0, 1.0};
+float g_adjustments[16] = {
+  0, 0, 0, 0.0005,
+  0, 0, 0, 0,
+  0, 0, 0, 0,
+  0, 0, 0, 0
+};
+
+//////////////////////////////////////////////////
+//! [update camera]
+void updateCameras()
+{
+  double angle = g_offset / 2 * M_PI;
+  double x = sin(angle) * 3.0 + 3.0;
+  double y = cos(angle) * 3.0;
+  for (ir::CameraPtr camera : g_cameras)
+  {
+    camera->SetLocalPosition(x, y, 0.0);
+  }
+
+  g_offset += 0.0005;
+}
+//! [update camera]
+
+//////////////////////////////////////////////////
+//! [update uniforms]
+void updateUniforms()
+{ 
+  (*g_shaderParams)["u_seed"].UpdateBuffer(g_seed); 
+  (*g_shaderParams)["u_resolution"].UpdateBuffer(g_resolution);
+  (*g_shaderParams)["u_color"].UpdateBuffer(g_color);
+  (*g_shaderParams)["u_adjustments"].UpdateBuffer(g_adjustments);
+}
+//! [update uniforms]
+
+//////////////////////////////////////////////////
+void displayCB()
+{
+#if __APPLE__
+  CGLSetCurrentContext(g_context);
+#elif _WIN32
+#else
+  if (g_display)
+  {
+    glXMakeCurrent(g_display, g_drawable, g_context);
+  }
+#endif
+
+  g_cameras[g_cameraIndex]->Capture(*g_image);
+
+#if __APPLE__
+  CGLSetCurrentContext(g_glutContext);
+#elif _WIN32
+#else
+  glXMakeCurrent(g_glutDisplay, g_glutDrawable, g_glutContext);
+#endif
+
+  unsigned char *data = g_image->Data<unsigned char>();
+
+  glClearColor(0.5, 0.5, 0.5, 1);
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  glPixelZoom(1, -1);
+  glRasterPos2f(-1, 1);
+  glDrawPixels(imgw, imgh, GL_RGB, GL_UNSIGNED_BYTE, data);
+
+  glutSwapBuffers();
+  updateCameras();
+  updateUniforms();
+}
+
+//////////////////////////////////////////////////
+void idleCB()
+{
+  glutPostRedisplay();
+}
+
+//////////////////////////////////////////////////
+void keyboardCB(unsigned char _key, int, int)
+{
+  if (_key == KEY_ESC || _key == 'q' || _key == 'Q')
+  {
+    exit(0);
+  }
+  else if (_key == 'o')
+  {
+    g_adjustments[3] -= 0.0001;
+  }
+  else if (_key == 'p')
+  {
+    g_adjustments[3] += 0.0001;
+  }
+}
+
+//////////////////////////////////////////////////
+void initCamera(ir::CameraPtr _camera)
+{
+  g_camera = _camera;
+  imgw = g_camera->ImageWidth();
+  imgh = g_camera->ImageHeight();
+  ir::Image image = g_camera->CreateImage();
+  g_image = std::make_shared<ir::Image>(image);
+  g_camera->Capture(*g_image);
+}
+
+//////////////////////////////////////////////////
+void initUniforms()
+{
+  ir::NodePtr node = g_camera->Parent();
+  ir::VisualPtr sphere = std::dynamic_pointer_cast<ir::Visual>(node->ChildByName("box"));
+  ir::MaterialPtr shader = sphere->Material();
+  g_shaderParams = shader->FragmentShaderParams();
+
+  (*g_shaderParams)["u_seed"].InitializeBuffer(1);
+  (*g_shaderParams)["u_resolution"].InitializeBuffer(2);
+  (*g_shaderParams)["u_color"].InitializeBuffer(3);
+  (*g_shaderParams)["u_adjustments"].InitializeBuffer(16);
+}
+
+//////////////////////////////////////////////////
+void initContext()
+{
+  glutInitDisplayMode(GLUT_DOUBLE);
+  glutInitWindowPosition(0, 0);
+  glutInitWindowSize(imgw, imgh);
+  glutCreateWindow("Custom Shaders Uniforms");
+  glutDisplayFunc(displayCB);
+  glutIdleFunc(idleCB);
+  glutKeyboardFunc(keyboardCB);
+}
+
+//////////////////////////////////////////////////
+void printUsage()
+{
+  std::cout << "===============================" << std::endl;
+  std::cout << "  ESC - Exit                   " << std::endl;
+  std::cout << "                               " << std::endl;
+  std::cout << "  o - Decrease Frequency       " << std::endl;
+  std::cout << "  p - Increase Frequency       " << std::endl;
+  std::cout << "===============================" << std::endl;
+}
+
+//////////////////////////////////////////////////
+void run(std::vector<ir::CameraPtr> _cameras)
+{
+  if (_cameras.empty())
+  {
+    ignerr << "No cameras found. Scene will not be rendered" << std::endl;
+    return;
+  }
+
+#if __APPLE__
+  g_context = CGLGetCurrentContext();
+#elif _WIN32
+#else
+  g_context = glXGetCurrentContext();
+  g_display = glXGetCurrentDisplay();
+  g_drawable = glXGetCurrentDrawable();
+#endif
+
+  g_cameras = _cameras;
+  initCamera(_cameras[0]);
+  initUniforms();
+  initContext();
+  printUsage();
+
+#if __APPLE__
+  g_glutContext = CGLGetCurrentContext();
+#elif _WIN32
+#else
+  g_glutDisplay = glXGetCurrentDisplay();
+  g_glutDrawable = glXGetCurrentDrawable();
+  g_glutContext = glXGetCurrentContext();
+#endif
+
+  glutMainLoop();
+}

examples/custom_shaders_uniforms/GlutWindow.hh

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+/*
+ * Copyright (C) 2021 Open Source Robotics Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+#ifndef IGNITION_RENDERING_EXAMPLES_CUSTOM_SHADERS_UNIFORMS_DEMO_GLUTWINDOW_HH_
+#define IGNITION_RENDERING_EXAMPLES_CUSTOM_SHADERS_UNIFORMS_DEMO_GLUTWINDOW_HH_
+
+#include <vector>
+#include "ignition/rendering/RenderTypes.hh"
+
+namespace ir = ignition::rendering;
+
+/// \brief Run the demo and render the scene from the cameras
+/// \param[in] _cameras Cameras in the scene
+void run(std::vector<ir::CameraPtr> _cameras);
+
+#endif