231 lines
7.8 KiB
C++
231 lines
7.8 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common/arguments.h"
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#include <filament/Camera.h>
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#include <filament/Engine.h>
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#include <filament/IndexBuffer.h>
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#include <filament/Material.h>
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#include <filament/MaterialInstance.h>
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#include <filament/RenderableManager.h>
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#include <filament/Scene.h>
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#include <filament/Skybox.h>
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#include <filament/Texture.h>
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#include <filament/TextureSampler.h>
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#include <filament/VertexBuffer.h>
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#include <filament/View.h>
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#include <utils/EntityManager.h>
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#include <utils/Path.h>
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#include <filamentapp/Config.h>
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#include <filamentapp/FilamentApp.h>
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#include <getopt/getopt.h>
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#include <stb_image.h>
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#include <iostream> // for cerr
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#include <string> // for printing usage/help
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#include "generated/resources/resources.h"
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using namespace filament;
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using utils::Entity;
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using utils::EntityManager;
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using utils::Path;
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using MinFilter = TextureSampler::MinFilter;
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using MagFilter = TextureSampler::MagFilter;
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struct App {
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VertexBuffer* vb;
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IndexBuffer* ib;
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Material* mat;
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MaterialInstance* matInstance;
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Camera* cam;
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Entity camera;
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Skybox* skybox;
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Texture* tex;
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Entity renderable;
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};
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struct Vertex {
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filament::math::float2 position;
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filament::math::float2 uv;
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};
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static const Vertex QUAD_VERTICES[4] = {
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{{-1, -1}, {0, 0}},
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{{ 1, -1}, {1, 0}},
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{{-1, 1}, {0, 1}},
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{{ 1, 1}, {1, 1}},
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};
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static constexpr uint16_t QUAD_INDICES[6] = {
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0, 1, 2,
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3, 2, 1,
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};
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static void printUsage(char* name) {
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std::string exec_name(utils::Path(name).getName());
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std::string usage("TEXTUREDQUAD renders a textured quad moving back and forth in a loop\n"
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"Usage:\n"
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" TEXTUREDQUAD [options]\n"
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"Options:\n"
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" --help, -h\n"
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" Prints this message\n\n"
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"API_USAGE");
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const std::string from("TEXTUREDQUAD");
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for (size_t pos = usage.find(from); pos != std::string::npos; pos = usage.find(from, pos)) {
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usage.replace(pos, from.length(), exec_name);
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}
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const std::string apiUsage("API_USAGE");
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for (size_t pos = usage.find(apiUsage); pos != std::string::npos; pos = usage.find(apiUsage, pos)) {
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usage.replace(pos, apiUsage.length(), samples::getBackendAPIArgumentsUsage());
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}
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std::cout << usage;
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}
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static int handleCommandLineArguments(int argc, char* argv[], Config& config) {
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static constexpr const char* OPTSTR = "ha:";
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static const struct option OPTIONS[] = {
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{ "help", no_argument, nullptr, 'h' },
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{ "api", required_argument, nullptr, 'a' },
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{ nullptr, 0, nullptr, 0 }
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};
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int opt;
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int option_index = 0;
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while ((opt = getopt_long(argc, argv, OPTSTR, OPTIONS, &option_index)) >= 0) {
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std::string arg(optarg ? optarg : "");
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switch (opt) {
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default:
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case 'h':
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printUsage(argv[0]);
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exit(0);
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case 'a':
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config.backend = samples::parseArgumentsForBackend(arg);
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break;
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}
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}
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return optind;
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}
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int main(int argc, char** argv) {
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Config config;
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config.title = "texturedquad";
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handleCommandLineArguments(argc, argv, config);
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App app;
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auto setup = [&app](Engine* engine, View* view, Scene* scene) {
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// Load texture
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Path path = FilamentApp::getRootAssetsPath() + "textures/Moss_01/Moss_01_Color.png";
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if (!path.exists()) {
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std::cerr << "The texture " << path << " does not exist" << std::endl;
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exit(1);
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}
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int w, h, n;
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unsigned char* data = stbi_load(path.c_str(), &w, &h, &n, 4);
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if (data == nullptr) {
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std::cerr << "The texture " << path << " could not be loaded" << std::endl;
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exit(1);
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}
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std::cout << "Loaded texture: " << w << "x" << h << std::endl;
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Texture::PixelBufferDescriptor buffer(data, size_t(w * h * 4),
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Texture::Format::RGBA, Texture::Type::UBYTE,
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(Texture::PixelBufferDescriptor::Callback) &stbi_image_free);
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app.tex = Texture::Builder()
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.width(uint32_t(w))
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.height(uint32_t(h))
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.levels(1)
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.sampler(Texture::Sampler::SAMPLER_2D)
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.format(Texture::InternalFormat::RGBA8)
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.build(*engine);
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app.tex->setImage(*engine, 0, std::move(buffer));
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TextureSampler sampler(MinFilter::LINEAR, MagFilter::LINEAR);
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// Set up view
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app.skybox = Skybox::Builder().color({0.1, 0.125, 0.25, 1.0}).build(*engine);
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scene->setSkybox(app.skybox);
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view->setPostProcessingEnabled(false);
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app.camera = utils::EntityManager::get().create();
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app.cam = engine->createCamera(app.camera);
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view->setCamera(app.cam);
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// Create quad renderable
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static_assert(sizeof(Vertex) == 16, "Strange vertex size.");
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app.vb = VertexBuffer::Builder()
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.vertexCount(4)
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.bufferCount(1)
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.attribute(VertexAttribute::POSITION, 0, VertexBuffer::AttributeType::FLOAT2, 0, 16)
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.attribute(VertexAttribute::UV0, 0, VertexBuffer::AttributeType::FLOAT2, 8, 16)
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.build(*engine);
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app.vb->setBufferAt(*engine, 0,
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VertexBuffer::BufferDescriptor(QUAD_VERTICES, 64, nullptr));
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app.ib = IndexBuffer::Builder()
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.indexCount(6)
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.bufferType(IndexBuffer::IndexType::USHORT)
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.build(*engine);
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app.ib->setBuffer(*engine,
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IndexBuffer::BufferDescriptor(QUAD_INDICES, 12, nullptr));
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app.mat = Material::Builder()
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.package(RESOURCES_BAKEDTEXTURE_DATA, RESOURCES_BAKEDTEXTURE_SIZE)
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.build(*engine);
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app.matInstance = app.mat->createInstance();
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app.matInstance->setParameter("albedo", app.tex, sampler);
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app.renderable = EntityManager::get().create();
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RenderableManager::Builder(1)
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.boundingBox({{ -1, -1, -1 }, { 1, 1, 1 }})
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.material(0, app.matInstance)
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.geometry(0, RenderableManager::PrimitiveType::TRIANGLES, app.vb, app.ib, 0, 6)
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.culling(false)
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.receiveShadows(false)
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.castShadows(false)
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.build(*engine, app.renderable);
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scene->addEntity(app.renderable);
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};
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auto cleanup = [&app](Engine* engine, View*, Scene*) {
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engine->destroy(app.skybox);
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engine->destroy(app.renderable);
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engine->destroy(app.matInstance);
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engine->destroy(app.mat);
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engine->destroy(app.tex);
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engine->destroy(app.vb);
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engine->destroy(app.ib);
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engine->destroyCameraComponent(app.camera);
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utils::EntityManager::get().destroy(app.camera);
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};
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FilamentApp::get().animate([&app](Engine* engine, View* view, double now) {
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const float zoom = 2.0 + 2.0 * sin(now);
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const uint32_t w = view->getViewport().width;
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const uint32_t h = view->getViewport().height;
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const float aspect = (float) w / h;
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app.cam->setProjection(Camera::Projection::ORTHO,
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-aspect * zoom, aspect * zoom,
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-zoom, zoom, -1, 1);
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});
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FilamentApp::get().run(config, setup, cleanup);
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return 0;
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}
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