ramses-example-basic-geometry/src/main.cpp

Basic Geometry Example

//  -------------------------------------------------------------------------
//  Copyright (C) 2014 BMW Car IT GmbH
//  -------------------------------------------------------------------------
//  This Source Code Form is subject to the terms of the Mozilla Public
//  License, v. 2.0. If a copy of the MPL was not distributed with this
//  file, You can obtain one at https://mozilla.org/MPL/2.0/.
//  -------------------------------------------------------------------------
 
#include "ramses-client.h"
 
#include <thread>
 
int main(int argc, char* argv[])
{
    // register at RAMSES daemon
    ramses::RamsesFramework framework(argc, argv);
    ramses::RamsesClient& ramses(*framework.createClient("ramses-example-basic-geometry"));
    framework.connect();
 
    // create a scene for distributing content
    ramses::Scene* scene = ramses.createScene(ramses::sceneId_t(123u), ramses::SceneConfig(), "basic geometry scene");
 
    // every scene needs a render pass with camera
    auto* camera = scene->createPerspectiveCamera("my camera");
    camera->setViewport(0, 0, 1280u, 480u);
    camera->setFrustum(19.f, 1280.f / 480.f, 0.1f, 1500.f);
    camera->setTranslation(0.0f, 0.0f, 5.0f);
    ramses::RenderPass* renderPass = scene->createRenderPass("my render pass");
    renderPass->setClearFlags(ramses::EClearFlags_None);
    renderPass->setCamera(*camera);
    ramses::RenderGroup* renderGroup = scene->createRenderGroup();
    renderPass->addRenderGroup(*renderGroup);
 
    // IMPORTANT NOTE: For simplicity and readability the example code does not check return values from API calls.
    //                 This should not be the case for real applications.
 
    // prepare triangle geometry: vertex position array and index array
    float vertexPositionsArray[] = { -1.f, 0.f, -1.f, 1.f, 0.f, -1.f, 0.f, 1.f, -1.f };
    ramses::ArrayResource* vertexPositions = scene->createArrayResource(ramses::EDataType::Vector3F, 3, vertexPositionsArray);
 
    // create an appearance for red triangle
    ramses::EffectDescription effectDesc;
    effectDesc.setVertexShaderFromFile("res/ramses-example-basic-geometry.vert");
    effectDesc.setFragmentShaderFromFile("res/ramses-example-basic-geometry.frag");
    effectDesc.setUniformSemantic("mvpMatrix", ramses::EEffectUniformSemantic::ModelViewProjectionMatrix);
 
    const ramses::Effect* effect = scene->createEffect(effectDesc, ramses::ResourceCacheFlag_DoNotCache, "glsl shader");
    ramses::Appearance* appearance = scene->createAppearance(*effect, "triangle appearance");
 
    // set vertex positions directly in geometry
    ramses::GeometryBinding* geometry = scene->createGeometryBinding(*effect, "triangle geometry");
    ramses::AttributeInput positionsInput;
    effect->findAttributeInput("a_position", positionsInput);
    geometry->setInputBuffer(positionsInput, *vertexPositions);
 
    // get input data of appearance and bind required data
    ramses::UniformInput colorInput;
    effect->findUniformInput("color", colorInput);
    appearance->setInputValueVector4f(colorInput, 1.0f, 0.0f, 0.0f, 1.0f);
 
    // create a mesh node to define the triangle with chosen appearance
    ramses::MeshNode* meshNode = scene->createMeshNode("triangle mesh node");
    meshNode->setAppearance(*appearance);
    meshNode->setIndexCount(3);
    meshNode->setGeometryBinding(*geometry);
 
    // mesh needs to be added to a render group that belongs to a render pass with camera in order to be rendered
    renderGroup->addMeshNode(*meshNode);
 
    // signal the scene it is in a state that can be rendered
    scene->flush();
 
    // distribute the scene to RAMSES
    scene->publish();
 
    // application logic
    std::this_thread::sleep_for(std::chrono::seconds(10));
 
    // shutdown: stop distribution, free resources, unregister
    scene->unpublish();
    scene->destroy(*vertexPositions);
    ramses.destroy(*scene);
    framework.disconnect();
 
    return 0;
}