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8f4ffbc78287323dacf1ce8b320779219ac0d94b
filament/samples/gltf_viewer.cpp
Philip Rideout 8f4ffbc782 gltfio: various improvements to skinning normalization. 
- Allow JavaScript and Java / Kotlin clients to configure this setting.
- Opt in by default (this was disabled in #2621)
- Optimize large assets like Bistro by iterating through prims only when
  the asset actually has skins.

Fixes #2714.
2020-06-23 13:30:45 -07:00

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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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.
*/
#define GLTFIO_SIMPLEVIEWER_IMPLEMENTATION
#include <filamentapp/Config.h>
#include <filamentapp/FilamentApp.h>
#include <filamentapp/IBL.h>
#include <filament/Camera.h>
#include <filament/ColorGrading.h>
#include <filament/Engine.h>
#include <filament/IndexBuffer.h>
#include <filament/Scene.h>
#include <filament/Skybox.h>
#include <filament/VertexBuffer.h>
#include <filament/View.h>
#include <filament/Renderer.h>
#include <gltfio/AssetLoader.h>
#include <gltfio/FilamentAsset.h>
#include <gltfio/ResourceLoader.h>
#include <gltfio/SimpleViewer.h>
#include <camutils/Manipulator.h>
#include <getopt/getopt.h>
#include <utils/NameComponentManager.h>
#include <math/vec3.h>
#include <math/vec4.h>
#include <math/mat3.h>
#include <math/norm.h>
#include <fstream>
#include <iostream>
#include <string>
#include "generated/resources/gltf_viewer.h"
using namespace filament;
using namespace filament::math;
using namespace gltfio;
using namespace utils;
struct App {
Engine* engine;
SimpleViewer* viewer;
Config config;
Camera* mainCamera;
AssetLoader* loader;
FilamentAsset* asset = nullptr;
NameComponentManager* names;
MaterialProvider* materials;
MaterialSource materialSource = GENERATE_SHADERS;
gltfio::ResourceLoader* resourceLoader = nullptr;
bool recomputeAabb = false;
bool actualSize = false;
struct ViewOptions {
float cameraAperture = 16.0f;
float cameraSpeed = 125.0f;
float cameraISO = 100.0f;
float groundShadowStrength = 0.75f;
bool groundPlaneEnabled = false;
bool skyboxEnabled = true;
sRGBColor backgroundColor = { 0.0f };
} viewOptions;
View::DepthOfFieldOptions dofOptions;
struct Scene {
Entity groundPlane;
VertexBuffer* groundVertexBuffer;
IndexBuffer* groundIndexBuffer;
Material* groundMaterial;
} scene;
struct ColorGradingOptions {
bool enabled = false;
int toneMapping = static_cast<int>(ColorGrading::ToneMapping::ACES_LEGACY);
int temperature = 0;
int tint = 0;
math::float3 outRed{1.0f, 0.0f, 0.0f};
math::float3 outGreen{0.0f, 1.0f, 0.0f};
math::float3 outBlue{0.0f, 0.0f, 1.0f};
math::float4 shadows{1.0f, 1.0f, 1.0f, 0.0f};
math::float4 midtones{1.0f, 1.0f, 1.0f, 0.0f};
math::float4 highlights{1.0f, 1.0f, 1.0f, 0.0f};
math::float4 ranges{0.0f, 0.333f, 0.550f, 1.0f};
float contrast = 1.0f;
float vibrance = 1.0f;
float saturation = 1.0f;
math::float3 slope{1.0f};
math::float3 offset{0.0f};
math::float3 power{1.0f};
math::float3 gamma{1.0f};
math::float3 midPoint{1.0f};
math::float3 scale{1.0f};
bool linkedCurves = false;
} colorGradingOptions;
ColorGradingOptions lastColorGradingOptions;
ColorGrading* colorGrading = nullptr;
float rangePlot[1024 * 3];
float curvePlot[1024 * 3];
// 0 is the default "free camera". Additional cameras come from the gltf file.
int currentCamera = 0;
};
static const char* DEFAULT_IBL = "venetian_crossroads_2k";
static void printUsage(char* name) {
std::string exec_name(Path(name).getName());
std::string usage(
"SHOWCASE renders the specified glTF file, or a built-in file if none is specified\n"
"Usage:\n"
" SHOWCASE [options] <gltf path>\n"
"Options:\n"
" --help, -h\n"
" Prints this message\n\n"
" --api, -a\n"
" Specify the backend API: opengl (default), vulkan, or metal\n\n"
" --ibl=<path to cmgen IBL>, -i <path>\n"
" Override the built-in IBL\n\n"
" --actual-size, -s\n"
" Do not scale the model to fit into a unit cube\n\n"
" --recompute-aabb, -r\n"
" Ignore the min/max attributes in the glTF file\n\n"
" --ubershader, -u\n"
" Enable ubershaders (improves load time, adds shader complexity)\n\n"
" --camera=<camera mode>, -c <camera mode>\n"
" Set the camera mode: orbit (default) or flight\n"
" Flight mode uses the following controls:\n"
" Click and drag the mouse to pan the camera\n"
" Use the scroll weel to adjust movement speed\n"
" W / S: forward / backward\n"
" A / D: left / right\n"
" E / Q: up / down\n"
);
const std::string from("SHOWCASE");
for (size_t pos = usage.find(from); pos != std::string::npos; pos = usage.find(from, pos)) {
usage.replace(pos, from.length(), exec_name);
}
std::cout << usage;
}
static int handleCommandLineArguments(int argc, char* argv[], App* app) {
static constexpr const char* OPTSTR = "ha:i:usc:r";
static const struct option OPTIONS[] = {
{ "help", no_argument, nullptr, 'h' },
{ "api", required_argument, nullptr, 'a' },
{ "ibl", required_argument, nullptr, 'i' },
{ "ubershader", no_argument, nullptr, 'u' },
{ "actual-size", no_argument, nullptr, 's' },
{ "camera", required_argument, nullptr, 'c' },
{ "recompute-aabb", no_argument, nullptr, 'r' },
{ nullptr, 0, nullptr, 0 }
};
int opt;
int option_index = 0;
while ((opt = getopt_long(argc, argv, OPTSTR, OPTIONS, &option_index)) >= 0) {
std::string arg(optarg ? optarg : "");
switch (opt) {
default:
case 'h':
printUsage(argv[0]);
exit(0);
case 'a':
if (arg == "opengl") {
app->config.backend = Engine::Backend::OPENGL;
} else if (arg == "vulkan") {
app->config.backend = Engine::Backend::VULKAN;
} else if (arg == "metal") {
app->config.backend = Engine::Backend::METAL;
} else {
std::cerr << "Unrecognized backend. Must be 'opengl'|'vulkan'|'metal'.\n";
}
break;
case 'c':
if (arg == "flight") {
app->config.cameraMode = camutils::Mode::FREE_FLIGHT;
} else if (arg == "orbit") {
app->config.cameraMode = camutils::Mode::ORBIT;
} else {
std::cerr << "Unrecognized camera mode. Must be 'flight'|'orbit'.\n";
}
break;
case 'i':
app->config.iblDirectory = arg;
break;
case 'u':
app->materialSource = LOAD_UBERSHADERS;
break;
case 's':
app->actualSize = true;
break;
case 'r':
app->recomputeAabb = true;
break;
}
}
return optind;
}
static std::ifstream::pos_type getFileSize(const char* filename) {
std::ifstream in(filename, std::ifstream::ate | std::ifstream::binary);
return in.tellg();
}
static void createGroundPlane(Engine* engine, Scene* scene, App& app) {
auto& em = EntityManager::get();
Material* shadowMaterial = Material::Builder()
.package(GLTF_VIEWER_GROUNDSHADOW_DATA, GLTF_VIEWER_GROUNDSHADOW_SIZE)
.build(*engine);
shadowMaterial->setDefaultParameter("strength", app.viewOptions.groundShadowStrength);
const static uint32_t indices[] = {
0, 1, 2, 2, 3, 0
};
Aabb aabb = app.asset->getBoundingBox();
if (!app.actualSize) {
mat4f transform = fitIntoUnitCube(aabb);
aabb = aabb.transform(transform);
}
float3 planeExtent{10.0f * aabb.extent().x, 0.0f, 10.0f * aabb.extent().z};
const static float3 vertices[] = {
{ -planeExtent.x, 0, -planeExtent.z },
{ -planeExtent.x, 0, planeExtent.z },
{ planeExtent.x, 0, planeExtent.z },
{ planeExtent.x, 0, -planeExtent.z },
};
short4 tbn = packSnorm16(
mat3f::packTangentFrame(
mat3f{
float3{ 1.0f, 0.0f, 0.0f },
float3{ 0.0f, 0.0f, 1.0f },
float3{ 0.0f, 1.0f, 0.0f }
}
).xyzw);
const static short4 normals[] { tbn, tbn, tbn, tbn };
VertexBuffer* vertexBuffer = VertexBuffer::Builder()
.vertexCount(4)
.bufferCount(2)
.attribute(VertexAttribute::POSITION,
0, VertexBuffer::AttributeType::FLOAT3)
.attribute(VertexAttribute::TANGENTS,
1, VertexBuffer::AttributeType::SHORT4)
.normalized(VertexAttribute::TANGENTS)
.build(*engine);
vertexBuffer->setBufferAt(*engine, 0, VertexBuffer::BufferDescriptor(
vertices, vertexBuffer->getVertexCount() * sizeof(vertices[0])));
vertexBuffer->setBufferAt(*engine, 1, VertexBuffer::BufferDescriptor(
normals, vertexBuffer->getVertexCount() * sizeof(normals[0])));
IndexBuffer* indexBuffer = IndexBuffer::Builder()
.indexCount(6)
.build(*engine);
indexBuffer->setBuffer(*engine, IndexBuffer::BufferDescriptor(
indices, indexBuffer->getIndexCount() * sizeof(uint32_t)));
Entity groundPlane = em.create();
RenderableManager::Builder(1)
.boundingBox({
{ -planeExtent.x, 0, -planeExtent.z },
{ planeExtent.x, 1e-4f, planeExtent.z }
})
.material(0, shadowMaterial->getDefaultInstance())
.geometry(0, RenderableManager::PrimitiveType::TRIANGLES,
vertexBuffer, indexBuffer, 0, 6)
.culling(false)
.receiveShadows(true)
.castShadows(false)
.build(*engine, groundPlane);
scene->addEntity(groundPlane);
auto& tcm = engine->getTransformManager();
tcm.setTransform(tcm.getInstance(groundPlane),
mat4f::translation(float3{ 0, aabb.min.y, -4 }));
auto& rcm = engine->getRenderableManager();
auto instance = rcm.getInstance(groundPlane);
rcm.setLayerMask(instance, 0xff, 0x00);
app.scene.groundPlane = groundPlane;
app.scene.groundVertexBuffer = vertexBuffer;
app.scene.groundIndexBuffer = indexBuffer;
app.scene.groundMaterial = shadowMaterial;
}
static void computeRangePlot(App& app, float* rangePlot) {
float4& ranges = app.colorGradingOptions.ranges;
ranges.y = clamp(ranges.y, ranges.x + 1e-5f, ranges.w - 1e-5f); // darks
ranges.z = clamp(ranges.z, ranges.x + 1e-5f, ranges.w - 1e-5f); // lights
for (size_t i = 0; i < 1024; i++) {
float x = i / 1024.0f;
float s = 1.0f - smoothstep(ranges.x, ranges.y, x);
float h = smoothstep(ranges.z, ranges.w, x);
rangePlot[i] = s;
rangePlot[1024 + i] = 1.0f - s - h;
rangePlot[2048 + i] = h;
}
}
static void rangePlotSeriesStart(int series) {
switch (series) {
case 0:
ImGui::PushStyleColor(ImGuiCol_PlotLines, (ImVec4) ImColor::HSV(0.4f, 0.25f, 1.0f));
break;
case 1:
ImGui::PushStyleColor(ImGuiCol_PlotLines, (ImVec4) ImColor::HSV(0.8f, 0.25f, 1.0f));
break;
case 2:
ImGui::PushStyleColor(ImGuiCol_PlotLines, (ImVec4) ImColor::HSV(0.17f, 0.21f, 1.0f));
break;
}
}
static void rangePlotSeriesEnd(int series) {
if (series < 3) {
ImGui::PopStyleColor();
}
}
static float getRangePlotValue(int series, void* data, int index) {
return ((float*) data)[series * 1024 + index];
}
inline float3 curves(float3 v, float3 shadowGamma, float3 midPoint, float3 highlightScale) {
float3 d = 1.0f / (pow(midPoint, shadowGamma - 1.0f));
float3 dark = pow(v, shadowGamma) * d;
float3 light = highlightScale * (v - midPoint) + midPoint;
return float3{
v.r <= midPoint.r ? dark.r : light.r,
v.g <= midPoint.g ? dark.g : light.g,
v.b <= midPoint.b ? dark.b : light.b,
};
}
static void computeCurvePlot(App& app, float* curvePlot) {
for (size_t i = 0; i < 1024; i++) {
float3 x{i / 1024.0f * 2.0f};
float3 y = curves(x,
app.colorGradingOptions.gamma,
app.colorGradingOptions.midPoint,
app.colorGradingOptions.scale);
curvePlot[i] = y.r;
curvePlot[1024 + i] = y.g;
curvePlot[2048 + i] = y.b;
}
}
static void tooltipFloat(float value) {
if (ImGui::IsItemActive() || ImGui::IsItemHovered()) {
ImGui::SetTooltip("%.2f", value);
}
}
static void pushSliderColors(float hue) {
ImGui::PushStyleColor(ImGuiCol_FrameBg, (ImVec4) ImColor::HSV(hue, 0.5f, 0.5f));
ImGui::PushStyleColor(ImGuiCol_FrameBgHovered, (ImVec4) ImColor::HSV(hue, 0.6f, 0.5f));
ImGui::PushStyleColor(ImGuiCol_FrameBgActive, (ImVec4) ImColor::HSV(hue, 0.7f, 0.5f));
ImGui::PushStyleColor(ImGuiCol_SliderGrab, (ImVec4) ImColor::HSV(hue, 0.9f, 0.9f));
}
static void popSliderColors() { ImGui::PopStyleColor(4); }
static void colorGradingUI(App& app) {
const static ImVec2 verticalSliderSize(18.0f, 160.0f);
const static ImVec2 plotLinesSize(260.0f, 160.0f);
const static ImVec2 plotLinesWideSize(350.0f, 120.0f);
if (ImGui::CollapsingHeader("Color grading")) {
App::ColorGradingOptions& colorGrading = app.colorGradingOptions;
ImGui::Indent();
ImGui::Checkbox("Enabled##colorGrading", &colorGrading.enabled);
ImGui::Combo("Tone-mapping", &colorGrading.toneMapping,
"Linear\0ACES (legacy)\0ACES\0Filmic\0Uchimura\0Reinhard\0Display Range\0\0");
if (ImGui::CollapsingHeader("While balance")) {
ImGui::SliderInt("Temperature", &colorGrading.temperature, -100, 100);
ImGui::SliderInt("Tint", &colorGrading.tint, -100, 100);
}
if (ImGui::CollapsingHeader("Channel mixer")) {
pushSliderColors(0.0f / 7.0f);
ImGui::VSliderFloat("##outRed.r", verticalSliderSize, &colorGrading.outRed.r, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outRed.r);
ImGui::SameLine();
ImGui::VSliderFloat("##outRed.g", verticalSliderSize, &colorGrading.outRed.g, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outRed.g);
ImGui::SameLine();
ImGui::VSliderFloat("##outRed.b", verticalSliderSize, &colorGrading.outRed.b, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outRed.b);
ImGui::SameLine(0.0f, 18.0f);
popSliderColors();
pushSliderColors(2.0f / 7.0f);
ImGui::VSliderFloat("##outGreen.r", verticalSliderSize, &colorGrading.outGreen.r, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outGreen.r);
ImGui::SameLine();
ImGui::VSliderFloat("##outGreen.g", verticalSliderSize, &colorGrading.outGreen.g, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outGreen.g);
ImGui::SameLine();
ImGui::VSliderFloat("##outGreen.b", verticalSliderSize, &colorGrading.outGreen.b, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outGreen.b);
ImGui::SameLine(0.0f, 18.0f);
popSliderColors();
pushSliderColors(4.0f / 7.0f);
ImGui::VSliderFloat("##outBlue.r", verticalSliderSize, &colorGrading.outBlue.r, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outBlue.r);
ImGui::SameLine();
ImGui::VSliderFloat("##outBlue.g", verticalSliderSize, &colorGrading.outBlue.g, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outBlue.g);
ImGui::SameLine();
ImGui::VSliderFloat("##outBlue.b", verticalSliderSize, &colorGrading.outBlue.b, -2.0f, 2.0f, "");
tooltipFloat(colorGrading.outBlue.b);
popSliderColors();
}
if (ImGui::CollapsingHeader("Tonal ranges")) {
ImGui::ColorEdit3("Shadows", &colorGrading.shadows.x);
ImGui::SliderFloat("Weight##shadowsWeight", &colorGrading.shadows.w, -2.0f, 2.0f);
ImGui::ColorEdit3("Mid-tones", &colorGrading.midtones.x);
ImGui::SliderFloat("Weight##midTonesWeight", &colorGrading.midtones.w, -2.0f, 2.0f);
ImGui::ColorEdit3("Highlights", &colorGrading.highlights.x);
ImGui::SliderFloat("Weight##highlightsWeight", &colorGrading.highlights.w, -2.0f, 2.0f);
ImGui::SliderFloat4("Ranges", &colorGrading.ranges.x, 0.0f, 1.0f);
computeRangePlot(app, app.rangePlot);
ImGuiExt::PlotLinesSeries("", 3,
rangePlotSeriesStart, getRangePlotValue, rangePlotSeriesEnd,
app.rangePlot, 1024, 0, "", 0.0f, 1.0f, plotLinesWideSize);
}
if (ImGui::CollapsingHeader("Color decision list")) {
ImGui::SliderFloat3("Slope", &colorGrading.slope.x, 0.0f, 2.0f);
ImGui::SliderFloat3("Offset", &colorGrading.offset.x, -0.5f, 0.5f);
ImGui::SliderFloat3("Power", &colorGrading.power.x, 0.0f, 2.0f);
}
if (ImGui::CollapsingHeader("Adjustments")) {
ImGui::SliderFloat("Contrast", &colorGrading.contrast, 0.0f, 2.0f);
ImGui::SliderFloat("Vibrance", &colorGrading.vibrance, 0.0f, 2.0f);
ImGui::SliderFloat("Saturation", &colorGrading.saturation, 0.0f, 2.0f);
}
if (ImGui::CollapsingHeader("Curves")) {
ImGui::Checkbox("Linked curves", &colorGrading.linkedCurves);
computeCurvePlot(app, app.curvePlot);
if (!colorGrading.linkedCurves) {
pushSliderColors(0.0f / 7.0f);
ImGui::VSliderFloat("##curveGamma.r", verticalSliderSize, &colorGrading.gamma.r, 0.0f, 4.0f, "");
tooltipFloat(colorGrading.gamma.r);
ImGui::SameLine();
ImGui::VSliderFloat("##curveMid.r", verticalSliderSize, &colorGrading.midPoint.r, 0.0f, 2.0f, "");
tooltipFloat(colorGrading.midPoint.r);
ImGui::SameLine();
ImGui::VSliderFloat("##curveScale.r", verticalSliderSize, &colorGrading.scale.r, 0.0f, 4.0f, "");
tooltipFloat(colorGrading.scale.r);
ImGui::SameLine(0.0f, 18.0f);
popSliderColors();
ImGui::PushStyleColor(ImGuiCol_PlotLines, (ImVec4) ImColor::HSV(0.0f, 0.7f, 0.8f));
ImGui::PlotLines("", app.curvePlot, 1024, 0, "Red", 0.0f, 2.0f, plotLinesSize);
ImGui::PopStyleColor();
pushSliderColors(2.0f / 7.0f);
ImGui::VSliderFloat("##curveGamma.g", verticalSliderSize, &colorGrading.gamma.g, 0.0f, 4.0f, "");
tooltipFloat(colorGrading.gamma.g);
ImGui::SameLine();
ImGui::VSliderFloat("##curveMid.g", verticalSliderSize, &colorGrading.midPoint.g, 0.0f, 2.0f, "");
tooltipFloat(colorGrading.midPoint.g);
ImGui::SameLine();
ImGui::VSliderFloat("##curveScale.g", verticalSliderSize, &colorGrading.scale.g, 0.0f, 4.0f, "");
tooltipFloat(colorGrading.scale.g);
ImGui::SameLine(0.0f, 18.0f);
popSliderColors();
ImGui::PushStyleColor(ImGuiCol_PlotLines, (ImVec4) ImColor::HSV(0.3f, 0.7f, 0.8f));
ImGui::PlotLines("", app.curvePlot + 1024, 1024, 0, "Green", 0.0f, 2.0f, plotLinesSize);
ImGui::PopStyleColor();
pushSliderColors(4.0f / 7.0f);
ImGui::VSliderFloat("##curveGamma.b", verticalSliderSize, &colorGrading.gamma.b, 0.0f, 4.0f, "");
tooltipFloat(colorGrading.gamma.b);
ImGui::SameLine();
ImGui::VSliderFloat("##curveMid.b", verticalSliderSize, &colorGrading.midPoint.b, 0.0f, 2.0f, "");
tooltipFloat(colorGrading.midPoint.b);
ImGui::SameLine();
ImGui::VSliderFloat("##curveScale.b", verticalSliderSize, &colorGrading.scale.b, 0.0f, 4.0f, "");
tooltipFloat(colorGrading.scale.b);
ImGui::SameLine(0.0f, 18.0f);
popSliderColors();
ImGui::PushStyleColor(ImGuiCol_PlotLines, (ImVec4) ImColor::HSV(0.6f, 0.7f, 0.8f));
ImGui::PlotLines("", app.curvePlot + 2048, 1024, 0, "Blue", 0.0f, 2.0f, plotLinesSize);
ImGui::PopStyleColor();
} else {
ImGui::VSliderFloat("##curveGamma", verticalSliderSize, &colorGrading.gamma.r, 0.0f, 4.0f, "");
tooltipFloat(colorGrading.gamma.r);
ImGui::SameLine();
ImGui::VSliderFloat("##curveMid", verticalSliderSize, &colorGrading.midPoint.r, 0.0f, 2.0f, "");
tooltipFloat(colorGrading.midPoint.r);
ImGui::SameLine();
ImGui::VSliderFloat("##curveScale", verticalSliderSize, &colorGrading.scale.r, 0.0f, 4.0f, "");
tooltipFloat(colorGrading.scale.r);
ImGui::SameLine(0.0f, 18.0f);
colorGrading.gamma = float3{colorGrading.gamma.r};
colorGrading.midPoint = float3{colorGrading.midPoint.r};
colorGrading.scale = float3{colorGrading.scale.r};
ImGui::PushStyleColor(ImGuiCol_PlotLines, (ImVec4) ImColor::HSV(0.17f, 0.21f, 0.9f));
ImGui::PlotLines("", app.curvePlot, 1024, 0, "RGB", 0.0f, 2.0f, plotLinesSize);
ImGui::PopStyleColor();
}
}
ImGui::Unindent();
}
}
static LinearColor inverseTonemapSRGB(sRGBColor x) {
return (x * -0.155) / (x - 1.019);
}
int main(int argc, char** argv) {
App app;
app.config.title = "Filament";
app.config.iblDirectory = FilamentApp::getRootAssetsPath() + DEFAULT_IBL;
int optionIndex = handleCommandLineArguments(argc, argv, &app);
utils::Path filename;
int num_args = argc - optionIndex;
if (num_args >= 1) {
filename = argv[optionIndex];
if (!filename.exists()) {
std::cerr << "file " << filename << " not found!" << std::endl;
return 1;
}
if (filename.isDirectory()) {
auto files = filename.listContents();
for (auto file : files) {
if (file.getExtension() == "gltf" || file.getExtension() == "glb") {
filename = file;
break;
}
}
if (filename.isDirectory()) {
std::cerr << "no glTF file found in " << filename << std::endl;
return 1;
}
}
}
auto loadAsset = [&app](utils::Path filename) {
// Peek at the file size to allow pre-allocation.
long contentSize = static_cast<long>(getFileSize(filename.c_str()));
if (contentSize <= 0) {
std::cerr << "Unable to open " << filename << std::endl;
exit(1);
}
// Consume the glTF file.
std::ifstream in(filename.c_str(), std::ifstream::binary | std::ifstream::in);
std::vector<uint8_t> buffer(static_cast<unsigned long>(contentSize));
if (!in.read((char*) buffer.data(), contentSize)) {
std::cerr << "Unable to read " << filename << std::endl;
exit(1);
}
// Parse the glTF file and create Filament entities.
if (filename.getExtension() == "glb") {
app.asset = app.loader->createAssetFromBinary(buffer.data(), buffer.size());
} else {
app.asset = app.loader->createAssetFromJson(buffer.data(), buffer.size());
}
buffer.clear();
buffer.shrink_to_fit();
if (!app.asset) {
std::cerr << "Unable to parse " << filename << std::endl;
exit(1);
}
};
auto loadResources = [&app] (utils::Path filename) {
// Load external textures and buffers.
std::string gltfPath = filename.getAbsolutePath();
ResourceConfiguration configuration = {};
configuration.engine = app.engine;
configuration.gltfPath = gltfPath.c_str();
configuration.recomputeBoundingBoxes = app.recomputeAabb;
configuration.normalizeSkinningWeights = true;
if (!app.resourceLoader) {
app.resourceLoader = new gltfio::ResourceLoader(configuration);
}
app.resourceLoader->asyncBeginLoad(app.asset);
// Load animation data then free the source hierarchy.
app.asset->getAnimator();
app.asset->releaseSourceData();
auto ibl = FilamentApp::get().getIBL();
if (ibl) {
app.viewer->setIndirectLight(ibl->getIndirectLight(), ibl->getSphericalHarmonics());
}
};
auto setup = [&](Engine* engine, View* view, Scene* scene) {
app.engine = engine;
app.names = new NameComponentManager(EntityManager::get());
app.viewer = new SimpleViewer(engine, scene, view, 410);
app.materials = (app.materialSource == GENERATE_SHADERS) ?
createMaterialGenerator(engine) : createUbershaderLoader(engine);
app.loader = AssetLoader::create({engine, app.materials, app.names });
app.mainCamera = &view->getCamera();
if (filename.isEmpty()) {
app.asset = app.loader->createAssetFromBinary(
GLTF_VIEWER_DAMAGEDHELMET_DATA,
GLTF_VIEWER_DAMAGEDHELMET_SIZE);
} else {
loadAsset(filename);
}
loadResources(filename);
createGroundPlane(engine, scene, app);
app.viewer->setUiCallback([&app, scene] () {
float progress = app.resourceLoader->asyncGetLoadProgress();
if (progress < 1.0) {
ImGui::ProgressBar(progress);
}
if (ImGui::CollapsingHeader("Stats")) {
ImGui::Indent();
ImGui::Text("%zu entities in the asset", app.asset->getEntityCount());
ImGui::Text("%zu renderables (excluding UI)", scene->getRenderableCount());
ImGui::Text("%zu skipped frames", FilamentApp::get().getSkippedFrameCount());
ImGui::Unindent();
}
if (ImGui::CollapsingHeader("Scene")) {
ImGui::Indent();
ImGui::Checkbox("Show skybox", &app.viewOptions.skyboxEnabled);
ImGui::ColorEdit3("Background color", &app.viewOptions.backgroundColor.r);
ImGui::Checkbox("Ground shadow", &app.viewOptions.groundPlaneEnabled);
ImGui::Indent();
ImGui::SliderFloat("Strength", &app.viewOptions.groundShadowStrength, 0.0f, 1.0f);
ImGui::Unindent();
ImGui::Unindent();
}
if (ImGui::CollapsingHeader("Camera")) {
ImGui::Indent();
ImGui::SliderFloat("Focal length (mm)", &FilamentApp::get().getCameraFocalLength(), 16.0f, 90.0f);
ImGui::SliderFloat("Aperture", &app.viewOptions.cameraAperture, 1.0f, 32.0f);
ImGui::SliderFloat("Speed (1/s)", &app.viewOptions.cameraSpeed, 1000.0f, 1.0f);
ImGui::SliderFloat("ISO", &app.viewOptions.cameraISO, 25.0f, 6400.0f);
ImGui::Checkbox("DoF", &app.dofOptions.enabled);
ImGui::SliderFloat("Focus distance", &app.dofOptions.focusDistance, 0.0f, 30.0f);
ImGui::SliderFloat("Blur scale", &app.dofOptions.blurScale, 0.1f, 10.0f);
const utils::Entity* cameras = app.asset->getCameraEntities();
const size_t cameraCount = app.asset->getCameraEntityCount();
std::vector<std::string> names;
names.reserve(cameraCount + 1);
names.push_back("Free camera");
int c = 0;
for (size_t i = 0; i < cameraCount; i++) {
const char* n = app.asset->getName(cameras[i]);
if (n) {
names.emplace_back(n);
} else {
char buf[32];
sprintf(buf, "Unnamed camera %d", c++);
names.emplace_back(buf);
}
}
std::vector<const char*> cstrings;
cstrings.reserve(names.size());
for (size_t i = 0; i < names.size(); i++) {
cstrings.push_back(names[i].c_str());
}
ImGui::ListBox("Cameras", &app.currentCamera, cstrings.data(), cstrings.size());
ImGui::Unindent();
}
colorGradingUI(app);
});
// Leave FXAA enabled but we also enable MSAA for a nice result. The wireframe looks
// much better with MSAA enabled.
view->setSampleCount(4);
};
auto cleanup = [&app](Engine* engine, View*, Scene*) {
app.loader->destroyAsset(app.asset);
app.materials->destroyMaterials();
engine->destroy(app.scene.groundPlane);
engine->destroy(app.scene.groundVertexBuffer);
engine->destroy(app.scene.groundIndexBuffer);
engine->destroy(app.scene.groundMaterial);
delete app.viewer;
delete app.materials;
delete app.names;
AssetLoader::destroy(&app.loader);
};
auto animate = [&app](Engine* engine, View* view, double now) {
app.resourceLoader->asyncUpdateLoad();
// Add renderables to the scene as they become ready.
app.viewer->populateScene(app.asset, !app.actualSize);
const size_t cameraCount = app.asset->getCameraEntityCount();
if (app.currentCamera == 0) {
view->setCamera(app.mainCamera);
} else {
const int gltfCamera = app.currentCamera - 1;
if (gltfCamera < cameraCount) {
const utils::Entity* cameras = app.asset->getCameraEntities();
Camera* c = engine->getCameraComponent(cameras[gltfCamera]);
assert(c);
view->setCamera(c);
// Override the aspect ratio in the glTF file and adjust the aspect ratio of this
// camera to the viewport.
const Viewport& vp = view->getViewport();
double aspectRatio = (double) vp.width / vp.height;
c->setScaling(double4 {1.0, aspectRatio, 1.0, 1.0});
}
}
app.viewer->applyAnimation(now);
};
auto resize = [&app](Engine* engine, View* view) {
Camera& camera = view->getCamera();
if (&camera == app.mainCamera) {
// Don't adjut the aspect ratio of the main camera, this is done inside of
// FilamentApp.cpp
return;
}
const Viewport& vp = view->getViewport();
double aspectRatio = (double) vp.width / vp.height;
camera.setScaling(double4 {1.0, aspectRatio, 1.0, 1.0});
};
auto gui = [&app](Engine* engine, View* view) {
app.viewer->updateUserInterface();
FilamentApp::get().setSidebarWidth(app.viewer->getSidebarWidth());
};
auto preRender = [&app](Engine* engine, View* view, Scene* scene, Renderer* renderer) {
auto& rcm = engine->getRenderableManager();
auto instance = rcm.getInstance(app.scene.groundPlane);
rcm.setLayerMask(instance,
0xff, app.viewOptions.groundPlaneEnabled ? 0xff : 0x00);
Camera& camera = view->getCamera();
camera.setExposure(
app.viewOptions.cameraAperture,
1.0f / app.viewOptions.cameraSpeed,
app.viewOptions.cameraISO);
view->setDepthOfFieldOptions(app.dofOptions);
app.scene.groundMaterial->setDefaultParameter(
"strength", app.viewOptions.groundShadowStrength);
auto ibl = FilamentApp::get().getIBL();
if (ibl) {
ibl->getSkybox()->setLayerMask(0xff, app.viewOptions.skyboxEnabled ? 0xff : 0x00);
}
// we have to clear because the side-bar doesn't have a background, we cannot use
// a skybox on the ui scene, because the ui view is always full screen.
renderer->setClearOptions({
.clearColor = { inverseTonemapSRGB(app.viewOptions.backgroundColor), 1.0f },
.clear = true
});
if (app.colorGradingOptions.enabled) {
if (memcmp(&app.colorGradingOptions, &app.lastColorGradingOptions,
sizeof(App::ColorGradingOptions))) {
App::ColorGradingOptions& options = app.colorGradingOptions;
ColorGrading* colorGrading = ColorGrading::Builder()
.whiteBalance(options.temperature / 100.0f, options.tint / 100.0f)
.channelMixer(options.outRed, options.outGreen, options.outBlue)
.shadowsMidtonesHighlights(
Color::toLinear(options.shadows),
Color::toLinear(options.midtones),
Color::toLinear(options.highlights),
options.ranges
)
.slopeOffsetPower(options.slope, options.offset, options.power)
.contrast(options.contrast)
.vibrance(options.vibrance)
.saturation(options.saturation)
.curves(options.gamma, options.midPoint, options.scale)
.toneMapping(static_cast<ColorGrading::ToneMapping>(options.toneMapping))
.build(*engine);
if (app.colorGrading) {
engine->destroy(app.colorGrading);
}
app.colorGrading = colorGrading;
app.lastColorGradingOptions = options;
}
view->setColorGrading(app.colorGrading);
} else {
view->setColorGrading(nullptr);
}
};
FilamentApp& filamentApp = FilamentApp::get();
filamentApp.animate(animate);
filamentApp.resize(resize);
filamentApp.setDropHandler([&] (std::string path) {
app.viewer->removeAsset();
app.loader->destroyAsset(app.asset);
loadAsset(path);
loadResources(path);
});
filamentApp.run(app.config, setup, cleanup, gui, preRender);
return 0;
}
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