src/scene-jellyfish.cpp - people/jessebarker/glmark2 - Git at Google

 //
 // Copyright © 2012 Linaro Limited
 //
 // This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
 //
 // glmark2 is free software: you can redistribute it and/or modify it under the
 // terms of the GNU General Public License as published by the Free Software
 // Foundation, either version 3 of the License, or (at your option) any later
 // version.
 //
 // glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 // FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 // details.
 //
 // You should have received a copy of the GNU General Public License along with
 // glmark2.  If not, see <http://www.gnu.org/licenses/>.
 //
 // Authors:
 //  Aleksandar Rodic - Creator and WebGL implementation
 //  Jesse Barker - glmark2 port
 //
 #include <string>
 #include <fstream>
 #include <memory>
 #include <iomanip>
 #include "scene.h"
 #include "scene-jellyfish.h"
 #include "log.h"
 #include "util.h"
 #include "texture.h"
 #include "shader-source.h"

 SceneJellyfish::SceneJellyfish(Canvas& canvas) :
     Scene(canvas, "jellyfish"), priv_(0)
 {

 }

 SceneJellyfish::~SceneJellyfish()
 {
     delete priv_;
 }

 bool
 SceneJellyfish::load()
 {
     running_ = false;
     return true;
 }

 void
 SceneJellyfish::unload()
 {
 }

 bool
 SceneJellyfish::setup()
 {
     if (!Scene::setup())
         return false;

     // Set up our private object that does all of the lifting
     priv_ = new JellyfishPrivate();
     if (!priv_->initialize())
         return false;

     // Set core scene timing after actual initialization so we don't measure
     // set up time.
     startTime_ = Util::get_timestamp_us() / 1000000.0;
     lastUpdateTime_ = startTime_;
     running_ = true;

     return true;
 }

 void
 SceneJellyfish::teardown()
 {
     priv_->cleanup();
     Scene::teardown();
 }

 void
 SceneJellyfish::update()
 {
     Scene::update();
     priv_->update_viewport(LibMatrix::vec2(canvas_.width(), canvas_.height()));
     priv_->update_time();
 }

 void
 SceneJellyfish::draw()
 {
     priv_->draw();
 }

 Scene::ValidationResult
 SceneJellyfish::validate()
 {
     return Scene::ValidationUnknown;
 }


 //
 // JellyfishPrivate implementation
 //
 using LibMatrix::mat4;
 using LibMatrix::vec3;
 using LibMatrix::vec2;
 using std::string;
 using std::vector;

 bool
 GradientRenderer::init()
 {
     // Program set up
     static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/gradient.vert");
     static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/gradient.frag");
     ShaderSource vtx_source(vtx_shader_filename);
     ShaderSource frg_source(frg_shader_filename);
     if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
         frg_source.str()))
     {
         return false;
     }
     positionLocation_ = program_["position"].location();
     uvLocation_ = program_["uvIn"].location();

     // Set up the position data for our "quad".
     vertices_.push_back(vec2(-1.0, -1.0));
     vertices_.push_back(vec2(1.0, -1.0));
     vertices_.push_back(vec2(-1.0, 1.0));
     vertices_.push_back(vec2(1.0, 1.0));
     uvs_.push_back(vec2(1.0, 1.0));
     uvs_.push_back(vec2(1.0, 1.0));
     uvs_.push_back(vec2(0.0, 0.0));
     uvs_.push_back(vec2(0.0, 0.0));
     uvOffset_ = vertices_.size() * sizeof(vec2);

     // Set up the VBO and stash our position data in it.
     glGenBuffers(1, &bufferObject_);
     glBindBuffer(GL_ARRAY_BUFFER, bufferObject_);
     glBufferData(GL_ARRAY_BUFFER, (vertices_.size() + uvs_.size()) * sizeof(vec2),
                  0, GL_STATIC_DRAW);
     glBufferSubData(GL_ARRAY_BUFFER, 0, vertices_.size() * sizeof(vec2),
                     &vertices_.front());
     glBufferSubData(GL_ARRAY_BUFFER, uvOffset_, uvs_.size() * sizeof(vec2),
                     &uvs_.front());
     glBindBuffer(GL_ARRAY_BUFFER, 0);

     return true;
 }

 void
 GradientRenderer::cleanup()
 {
     program_.stop();
     program_.release();
     glBindBuffer(GL_ARRAY_BUFFER, 0);
     glDeleteBuffers(1, &bufferObject_);
 }

 void
 GradientRenderer::draw()
 {
     static const vec3 lightBlue(0.360784314, 0.584313725, 1.0);
     static const vec3 darkBlue(0.074509804, 0.156862745, 0.619607843);
     glBindBuffer(GL_ARRAY_BUFFER, bufferObject_);
     program_.start();
     program_["color1"] = lightBlue;
     program_["color2"] = darkBlue;
     glEnableVertexAttribArray(positionLocation_);
     glEnableVertexAttribArray(uvLocation_);
     glVertexAttribPointer(positionLocation_, 2, GL_FLOAT, GL_FALSE, 0, 0);
     glVertexAttribPointer(uvLocation_, 2, GL_FLOAT, GL_FALSE, 0,
                           reinterpret_cast<GLvoid*>(uvOffset_));
     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
     glDisableVertexAttribArray(positionLocation_);
     glDisableVertexAttribArray(uvLocation_);
     program_.stop();
     glBindBuffer(GL_ARRAY_BUFFER, 0);
 }

 //!
 // Parse index values from an OBJ file.
 //
 // @param source the source line to parse
 // @param idx the unsigned short to populate
 //
 static void
 obj_get_index(const string& source, unsigned short& idx)
 {
      // Skip the definition type...
     string::size_type endPos = source.find(" ");
     string::size_type startPos(0);
     if (endPos == string::npos)
     {
         Log::error("Bad element '%s'\n", source.c_str());
         return;
     }
     // Find the first value...
     startPos = endPos + 1;
     string is(source, startPos);
     idx = Util::fromString<unsigned short>(is);
 }

 //!
 // Parse vec3 values from an OBJ file.
 //
 // @param source the source line to parse
 // @param v the vec3 to populate
 //
 static void
 obj_get_values(const string& source, vec3& v)
 {
     // Skip the definition type...
     string::size_type endPos = source.find(" ");
     string::size_type startPos(0);
     if (endPos == string::npos)
     {
         Log::error("Bad element '%s'\n", source.c_str());
         return;
     }
     // Find the first value...
     startPos = endPos + 1;
     endPos = source.find(" ", startPos);
     if (endPos == string::npos)
     {
         Log::error("Bad element '%s'\n", source.c_str());
         return;
     }
     string::size_type numChars(endPos - startPos);
     string xs(source, startPos, numChars);
     float x = Util::fromString<float>(xs);
     // Then the second value...
     startPos = endPos + 1;
     endPos = source.find(" ", startPos);
     if (endPos == string::npos)
     {
         Log::error("Bad element '%s'\n", source.c_str());
         return;
     }
     numChars = endPos - startPos;
     string ys(source, startPos, numChars);
     float y = Util::fromString<float>(ys);
     // And the third value (there might be a fourth, but we don't care)...
     startPos = endPos + 1;
     endPos = source.find(" ", startPos);
     if (endPos == string::npos)
     {
         numChars = endPos;
     }
     else
     {
         numChars = endPos - startPos;
     }
     string zs(source, startPos, endPos - startPos);
     float z = Util::fromString<float>(zs);
     v.x(x);
     v.y(y);
     v.z(z);
 }

 // Custom OBJ loader.
 //
 // To support the jellyfish model, some amendments to the OBJ format are
 // necessary.  In particular, a vertex color attribute is required, and
 // it contains an index list rather than a face list.
 bool
 JellyfishPrivate::load_obj(const std::string &filename)
 {
     Log::debug("Loading model from file '%s'\n", filename.c_str());

     const std::auto_ptr<std::istream> input_file_ptr(Util::get_resource(filename));
     std::istream& inputFile(*input_file_ptr);
     if (!inputFile)
     {
         Log::error("Failed to open '%s'\n", filename.c_str());
         return false;
     }

     vector<string> sourceVec;
     string curLine;
     while (getline(inputFile, curLine))
     {
         sourceVec.push_back(curLine);
     }

     static const string vertex_definition("v");
     static const string normal_definition("vn");
     static const string texcoord_definition("vt");
     static const string color_definition("vc");
     static const string index_definition("i");
     for (vector<string>::const_iterator lineIt = sourceVec.begin();
          lineIt != sourceVec.end();
          lineIt++)
     {
         const string& curSrc = *lineIt;
         // Is it a vertex attribute, a face description, comment or other?
         // We only care about the first two, we ignore comments, object names,
         // group names, smoothing groups, etc.
         string::size_type startPos(0);
         string::size_type spacePos = curSrc.find(" ", startPos);
         string definitionType(curSrc, startPos, spacePos - startPos);
         if (definitionType == vertex_definition)
         {
             vec3 v;
             obj_get_values(curSrc, v);
             positions_.push_back(v);
         }
         else if (definitionType == normal_definition)
         {
             vec3 v;
             obj_get_values(curSrc, v);
             normals_.push_back(v);
         }
         else if (definitionType == color_definition)
         {
             vec3 v;
             obj_get_values(curSrc, v);
             colors_.push_back(v);
         }
         else if (definitionType == texcoord_definition)
         {
             vec3 v;
             obj_get_values(curSrc, v);
             texcoords_.push_back(v);
         }
         else if (definitionType == index_definition)
         {
             unsigned short idx(0);
             obj_get_index(curSrc, idx);
             indices_.push_back(idx);
         }
     }

     Log::debug("Object populated with %u vertices %u normals %u colors %u texcoords and %u indices.\n",
         positions_.size(), normals_.size(), colors_.size(), texcoords_.size(), indices_.size());
     return true;
 }

 JellyfishPrivate::JellyfishPrivate() :
     positionLocation_(0),
     normalLocation_(0),
     colorLocation_(0),
     texcoordLocation_(0),
     viewport_(512.0, 512.0),
     lightPosition_(10.0, 40.0, -60.0),
     lightColor_(0.8, 1.3, 1.1, 1.0),
     lightRadius_(200.0),
     ambientColor_(0.3, 0.2, 1.0, 1.0),
     fresnelColor_(0.8, 0.7, 0.6, 1.1),
     fresnelPower_(1.0),
     rotation_(0.0),
     currentTime_(0.0),
     lastUpdateTime_(0.0),
     cullFace_(0),
     depthTest_(0),
     blend_(0),
     blendFuncSrc_(0),
     blendFuncDst_(0)
 {
 }

 JellyfishPrivate::~JellyfishPrivate()
 {
     positions_.clear();
     normals_.clear();
     colors_.clear();
     texcoords_.clear();
     indices_.clear();
 }

 bool
 JellyfishPrivate::initialize()
 {
     static const string modelFilename(GLMARK_DATA_PATH"/models/jellyfish.jobj");
     if (!load_obj(modelFilename))
     {
         return false;
     }

     // Now that we've setup the vertex data, we can setup the map of how
     // that data will be laid out in the buffer object.
     static const unsigned int sv3(sizeof(vec3));
     dataMap_.positionOffset = 0;
     dataMap_.positionSize = positions_.size() * sv3;
     dataMap_.totalSize = dataMap_.positionSize;
     dataMap_.normalOffset = dataMap_.positionOffset + dataMap_.positionSize;
     dataMap_.normalSize = normals_.size() * sv3;
     dataMap_.totalSize += dataMap_.normalSize;
     dataMap_.colorOffset = dataMap_.normalOffset + dataMap_.normalSize;
     dataMap_.colorSize = colors_.size() * sv3;
     dataMap_.totalSize += dataMap_.colorSize;
     dataMap_.texcoordOffset = dataMap_.colorOffset + dataMap_.colorSize;
     dataMap_.texcoordSize = texcoords_.size() * sv3;
     dataMap_.totalSize += dataMap_.texcoordSize;

     lastUpdateTime_ = Util::get_timestamp_us() / 1000.0;
     currentTime_ = static_cast<uint64_t>(lastUpdateTime_) % 100000000 / 1000.0;
     whichCaustic_ = static_cast<uint64_t>(currentTime_ * 30) % 32 + 1;
     rotation_ = 0.0;

     if (!gradient_.init())
     {
         return false;
     }

     // Set up program first so we can store attribute and uniform locations
     // away for the
     using std::string;
     static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/jellyfish.vert");
     static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/jellyfish.frag");

     ShaderSource vtx_source(vtx_shader_filename);
     ShaderSource frg_source(frg_shader_filename);

     if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
         frg_source.str()))
     {
         return false;
     }

     // Stash away attribute and uniform locations for handy use.
     positionLocation_ = program_["aVertexPosition"].location();
     normalLocation_ = program_["aVertexNormal"].location();
     colorLocation_ = program_["aVertexColor"].location();
     texcoordLocation_ = program_["aTextureCoord"].location();

     // We need 2 buffers for our work here.  One for the vertex data.
     // and one for the index data.
     glGenBuffers(2, &bufferObjects_[0]);

     // First, setup the vertex data by binding the first buffer object,
     // allocating its data store, and filling it in with our vertex data.
     glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
     glBufferData(GL_ARRAY_BUFFER, dataMap_.totalSize, 0, GL_STATIC_DRAW);
     glBufferSubData(GL_ARRAY_BUFFER, dataMap_.positionOffset,
                     dataMap_.positionSize, &positions_.front());
     glBufferSubData(GL_ARRAY_BUFFER, dataMap_.normalOffset,
                     dataMap_.normalSize, &normals_.front());
     glBufferSubData(GL_ARRAY_BUFFER, dataMap_.colorOffset,
                     dataMap_.colorSize, &colors_.front());
     glBufferSubData(GL_ARRAY_BUFFER, dataMap_.texcoordOffset,
                     dataMap_.texcoordSize, &texcoords_.front());

     // Now repeat for our index data.
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
     glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices_.size() * sizeof(unsigned short),
                  &indices_.front(), GL_STATIC_DRAW);

     // "Unbind" our buffer objects to make sure the state is consistent.
     glBindBuffer(GL_ARRAY_BUFFER, 0);
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

     // Finally, set up our textures.
     //
     // First, the main jellyfish texture
     bool gotTex = Texture::load("jellyfish256", &textureObjects_[0], GL_LINEAR,
                                 GL_LINEAR, 0);
     if (!gotTex || textureObjects_[0] == 0)
     {
         Log::error("Jellyfish texture set up failed!!!\n");
         return false;
     }
     glBindTexture(GL_TEXTURE_2D, 0);
     // Then, the caustics textures
     static const string baseName("jellyfish-caustics-");
     for (unsigned int i = 1; i < 33; i++)
     {
         std::stringstream ss;
         ss << std::setw(2) << std::setfill('0') << i;
         string curName(baseName);
         curName += ss.str();
         gotTex = Texture::load(curName, &textureObjects_[i], GL_LINEAR,
                                GL_LINEAR, 0);
         if (!gotTex || textureObjects_[i] == 0)
         {
             Log::error("Caustics texture[%u] set up failed!!!\n", i);
             return false;
         }
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
         glBindTexture(GL_TEXTURE_2D, 0);
     }

     // Save the GL state we are changing so we can restore it later.
     cullFace_ = glIsEnabled(GL_CULL_FACE);
     depthTest_ = glIsEnabled(GL_DEPTH_TEST);
     blend_ = glIsEnabled(GL_BLEND);
     glGetIntegerv(GL_BLEND_SRC_RGB, &blendFuncSrc_);
     glGetIntegerv(GL_BLEND_DST_RGB, &blendFuncDst_);

     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glEnable(GL_BLEND);
     glDisable(GL_CULL_FACE);
     glDisable(GL_DEPTH_TEST);

     return true;
 }

 void
 JellyfishPrivate::update_viewport(const vec2& vp)
 {
     if (viewport_.x() == vp.x() && viewport_.y() == vp.y())
     {
         return;
     }
     viewport_ = vp;
     projection_.loadIdentity();
     projection_.perspective(30.0, viewport_.x()/viewport_.y(), 20.0, 120.0);
 }

 void
 JellyfishPrivate::update_time()
 {
     double now = Util::get_timestamp_us() / 1000.0;
     double elapsedTime = now - lastUpdateTime_;
     rotation_ += (2.0 * elapsedTime) / 1000.0;
     currentTime_ = static_cast<uint64_t>(now) % 100000000 / 1000.0;
     whichCaustic_ = static_cast<uint64_t>(currentTime_ * 30) % 32 + 1;
     lastUpdateTime_ = now;
 }

 void
 JellyfishPrivate::cleanup()
 {
     // Restore the GL state we changed for the scene.
     glBlendFunc(blendFuncSrc_, blendFuncDst_);
     if (GL_FALSE == blend_)
     {
         glDisable(GL_BLEND);
     }
     if (GL_TRUE == cullFace_)
     {
         glEnable(GL_CULL_FACE);
     }
     if (GL_TRUE == depthTest_)
     {
         glEnable(GL_DEPTH_TEST);
     }

     program_.stop();
     program_.release();

     glBindBuffer(GL_ARRAY_BUFFER, 0);
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

     glDeleteTextures(33, &textureObjects_[0]);
     glDeleteBuffers(2, &bufferObjects_[0]);

     gradient_.cleanup();
 }

 void
 JellyfishPrivate::draw()
 {
     // "Clear" the background to the desired gradient.
     gradient_.draw();

     // We need "world", "world view projection", and "world inverse transpose"
     // matrix uniforms for the current shader.
     //
     // NOTE: Some of this seems a bit of a no-op (e.g., multipying by and
     //       inverting identity matrices), but leave it like the original
     //       WebGL files for the time being.  Worth revisiting not doing all
     //       of that math every draw call (might even be good to be doing
     //       some of it in the shader as well).
     world_.push();
     world_.translate(0.0, 5.0, -75.0);
     world_.rotate(sin(rotation_ / 10.0) * 30.0, 0.0, 1.0, 0.0);
     world_.rotate(sin(rotation_ / 20.0) * 30.0, 1.0, 0.0, 0.0);
     world_.scale(5.0, 5.0, 5.0);
     world_.translate(0.0, sin(rotation_ / 10.0) * 2.5, 0.0);
     mat4 worldViewProjection(projection_.getCurrent());
     worldViewProjection *= world_.getCurrent();;
     mat4 worldInverseTranspose(world_.getCurrent());
     worldInverseTranspose.inverse().transpose();

     // Load up the uniforms
     program_.start();
     program_["uWorld"] = world_.getCurrent();
     program_["uWorldViewProj"] = worldViewProjection;
     program_["uWorldInvTranspose"] = worldInverseTranspose;
     program_["uCurrentTime"] = currentTime_;
     // Revisit making these constants rather than uniforms as they appear never
     // to change
     program_["uLightPos"] = lightPosition_;
     program_["uLightRadius"] = lightRadius_;
     program_["uLightCol"] = lightColor_;
     program_["uAmbientCol"] = ambientColor_;
     program_["uFresnelCol"] = fresnelColor_;
     program_["uFresnelPower"] = fresnelPower_;
     // Set up textures for this frame.
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(GL_TEXTURE_2D, textureObjects_[0]);
     program_["uSampler"] = 0;
     glActiveTexture(GL_TEXTURE1);
     glBindTexture(GL_TEXTURE_2D, textureObjects_[whichCaustic_]);
     program_["uSampler1"] = 1;

     glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);

     glEnableVertexAttribArray(positionLocation_);
     glEnableVertexAttribArray(normalLocation_);
     glEnableVertexAttribArray(colorLocation_);
     glEnableVertexAttribArray(texcoordLocation_);
     glVertexAttribPointer(positionLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
         reinterpret_cast<const GLvoid*>(dataMap_.positionOffset));
     glVertexAttribPointer(normalLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
         reinterpret_cast<const GLvoid*>(dataMap_.normalOffset));
     glVertexAttribPointer(colorLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
         reinterpret_cast<const GLvoid*>(dataMap_.colorOffset));
     glVertexAttribPointer(texcoordLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
         reinterpret_cast<const GLvoid*>(dataMap_.texcoordOffset));

     glDrawElements(GL_TRIANGLES, indices_.size(), GL_UNSIGNED_SHORT, 0);

     glDisableVertexAttribArray(positionLocation_);
     glDisableVertexAttribArray(normalLocation_);
     glDisableVertexAttribArray(colorLocation_);
     glDisableVertexAttribArray(texcoordLocation_);

     glBindBuffer(GL_ARRAY_BUFFER, 0);
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

     program_.stop();
     world_.pop();
 }
	//
	// Copyright © 2012 Linaro Limited
	//
	// This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
	//
	// glmark2 is free software: you can redistribute it and/or modify it under the
	// terms of the GNU General Public License as published by the Free Software
	// Foundation, either version 3 of the License, or (at your option) any later
	// version.
	//
	// glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
	// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
	// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
	// details.
	//
	// You should have received a copy of the GNU General Public License along with
	// glmark2. If not, see <http://www.gnu.org/licenses/>.
	//
	// Authors:
	// Aleksandar Rodic - Creator and WebGL implementation
	// Jesse Barker - glmark2 port
	//
	#include <string>
	#include <fstream>
	#include <memory>
	#include <iomanip>
	#include "scene.h"
	#include "scene-jellyfish.h"
	#include "log.h"
	#include "util.h"
	#include "texture.h"
	#include "shader-source.h"

	SceneJellyfish::SceneJellyfish(Canvas& canvas) :
	Scene(canvas, "jellyfish"), priv_(0)
	{

	}

	SceneJellyfish::~SceneJellyfish()
	{
	delete priv_;
	}

	bool
	SceneJellyfish::load()
	{
	running_ = false;
	return true;
	}

	void
	SceneJellyfish::unload()
	{
	}

	bool
	SceneJellyfish::setup()
	{
	if (!Scene::setup())
	return false;

	// Set up our private object that does all of the lifting
	priv_ = new JellyfishPrivate();
	if (!priv_->initialize())
	return false;

	// Set core scene timing after actual initialization so we don't measure
	// set up time.
	startTime_ = Util::get_timestamp_us() / 1000000.0;
	lastUpdateTime_ = startTime_;
	running_ = true;

	return true;
	}

	void
	SceneJellyfish::teardown()
	{
	priv_->cleanup();
	Scene::teardown();
	}

	void
	SceneJellyfish::update()
	{
	Scene::update();
	priv_->update_viewport(LibMatrix::vec2(canvas_.width(), canvas_.height()));
	priv_->update_time();
	}

	void
	SceneJellyfish::draw()
	{
	priv_->draw();
	}

	Scene::ValidationResult
	SceneJellyfish::validate()
	{
	return Scene::ValidationUnknown;
	}


	//
	// JellyfishPrivate implementation
	//
	using LibMatrix::mat4;
	using LibMatrix::vec3;
	using LibMatrix::vec2;
	using std::string;
	using std::vector;

	bool
	GradientRenderer::init()
	{
	// Program set up
	static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/gradient.vert");
	static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/gradient.frag");
	ShaderSource vtx_source(vtx_shader_filename);
	ShaderSource frg_source(frg_shader_filename);
	if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
	frg_source.str()))
	{
	return false;
	}
	positionLocation_ = program_["position"].location();
	uvLocation_ = program_["uvIn"].location();

	// Set up the position data for our "quad".
	vertices_.push_back(vec2(-1.0, -1.0));
	vertices_.push_back(vec2(1.0, -1.0));
	vertices_.push_back(vec2(-1.0, 1.0));
	vertices_.push_back(vec2(1.0, 1.0));
	uvs_.push_back(vec2(1.0, 1.0));
	uvs_.push_back(vec2(1.0, 1.0));
	uvs_.push_back(vec2(0.0, 0.0));
	uvs_.push_back(vec2(0.0, 0.0));
	uvOffset_ = vertices_.size() * sizeof(vec2);

	// Set up the VBO and stash our position data in it.
	glGenBuffers(1, &bufferObject_);
	glBindBuffer(GL_ARRAY_BUFFER, bufferObject_);
	glBufferData(GL_ARRAY_BUFFER, (vertices_.size() + uvs_.size()) * sizeof(vec2),
	0, GL_STATIC_DRAW);
	glBufferSubData(GL_ARRAY_BUFFER, 0, vertices_.size() * sizeof(vec2),
	&vertices_.front());
	glBufferSubData(GL_ARRAY_BUFFER, uvOffset_, uvs_.size() * sizeof(vec2),
	&uvs_.front());
	glBindBuffer(GL_ARRAY_BUFFER, 0);

	return true;
	}

	void
	GradientRenderer::cleanup()
	{
	program_.stop();
	program_.release();
	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glDeleteBuffers(1, &bufferObject_);
	}

	void
	GradientRenderer::draw()
	{
	static const vec3 lightBlue(0.360784314, 0.584313725, 1.0);
	static const vec3 darkBlue(0.074509804, 0.156862745, 0.619607843);
	glBindBuffer(GL_ARRAY_BUFFER, bufferObject_);
	program_.start();
	program_["color1"] = lightBlue;
	program_["color2"] = darkBlue;
	glEnableVertexAttribArray(positionLocation_);
	glEnableVertexAttribArray(uvLocation_);
	glVertexAttribPointer(positionLocation_, 2, GL_FLOAT, GL_FALSE, 0, 0);
	glVertexAttribPointer(uvLocation_, 2, GL_FLOAT, GL_FALSE, 0,
	reinterpret_cast<GLvoid*>(uvOffset_));
	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
	glDisableVertexAttribArray(positionLocation_);
	glDisableVertexAttribArray(uvLocation_);
	program_.stop();
	glBindBuffer(GL_ARRAY_BUFFER, 0);
	}

	//!
	// Parse index values from an OBJ file.
	//
	// @param source the source line to parse
	// @param idx the unsigned short to populate
	//
	static void
	obj_get_index(const string& source, unsigned short& idx)
	{
	// Skip the definition type...
	string::size_type endPos = source.find(" ");
	string::size_type startPos(0);
	if (endPos == string::npos)
	{
	Log::error("Bad element '%s'\n", source.c_str());
	return;
	}
	// Find the first value...
	startPos = endPos + 1;
	string is(source, startPos);
	idx = Util::fromString<unsigned short>(is);
	}

	//!
	// Parse vec3 values from an OBJ file.
	//
	// @param source the source line to parse
	// @param v the vec3 to populate
	//
	static void
	obj_get_values(const string& source, vec3& v)
	{
	// Skip the definition type...
	string::size_type endPos = source.find(" ");
	string::size_type startPos(0);
	if (endPos == string::npos)
	{
	Log::error("Bad element '%s'\n", source.c_str());
	return;
	}
	// Find the first value...
	startPos = endPos + 1;
	endPos = source.find(" ", startPos);
	if (endPos == string::npos)
	{
	Log::error("Bad element '%s'\n", source.c_str());
	return;
	}
	string::size_type numChars(endPos - startPos);
	string xs(source, startPos, numChars);
	float x = Util::fromString<float>(xs);
	// Then the second value...
	startPos = endPos + 1;
	endPos = source.find(" ", startPos);
	if (endPos == string::npos)
	{
	Log::error("Bad element '%s'\n", source.c_str());
	return;
	}
	numChars = endPos - startPos;
	string ys(source, startPos, numChars);
	float y = Util::fromString<float>(ys);
	// And the third value (there might be a fourth, but we don't care)...
	startPos = endPos + 1;
	endPos = source.find(" ", startPos);
	if (endPos == string::npos)
	{
	numChars = endPos;
	}
	else
	{
	numChars = endPos - startPos;
	}
	string zs(source, startPos, endPos - startPos);
	float z = Util::fromString<float>(zs);
	v.x(x);
	v.y(y);
	v.z(z);
	}

	// Custom OBJ loader.
	//
	// To support the jellyfish model, some amendments to the OBJ format are
	// necessary. In particular, a vertex color attribute is required, and
	// it contains an index list rather than a face list.
	bool
	JellyfishPrivate::load_obj(const std::string &filename)
	{
	Log::debug("Loading model from file '%s'\n", filename.c_str());

	const std::auto_ptr<std::istream> input_file_ptr(Util::get_resource(filename));
	std::istream& inputFile(*input_file_ptr);
	if (!inputFile)
	{
	Log::error("Failed to open '%s'\n", filename.c_str());
	return false;
	}

	vector<string> sourceVec;
	string curLine;
	while (getline(inputFile, curLine))
	{
	sourceVec.push_back(curLine);
	}

	static const string vertex_definition("v");
	static const string normal_definition("vn");
	static const string texcoord_definition("vt");
	static const string color_definition("vc");
	static const string index_definition("i");
	for (vector<string>::const_iterator lineIt = sourceVec.begin();
	lineIt != sourceVec.end();
	lineIt++)
	{
	const string& curSrc = *lineIt;
	// Is it a vertex attribute, a face description, comment or other?
	// We only care about the first two, we ignore comments, object names,
	// group names, smoothing groups, etc.
	string::size_type startPos(0);
	string::size_type spacePos = curSrc.find(" ", startPos);
	string definitionType(curSrc, startPos, spacePos - startPos);
	if (definitionType == vertex_definition)
	{
	vec3 v;
	obj_get_values(curSrc, v);
	positions_.push_back(v);
	}
	else if (definitionType == normal_definition)
	{
	vec3 v;
	obj_get_values(curSrc, v);
	normals_.push_back(v);
	}
	else if (definitionType == color_definition)
	{
	vec3 v;
	obj_get_values(curSrc, v);
	colors_.push_back(v);
	}
	else if (definitionType == texcoord_definition)
	{
	vec3 v;
	obj_get_values(curSrc, v);
	texcoords_.push_back(v);
	}
	else if (definitionType == index_definition)
	{
	unsigned short idx(0);
	obj_get_index(curSrc, idx);
	indices_.push_back(idx);
	}
	}

	Log::debug("Object populated with %u vertices %u normals %u colors %u texcoords and %u indices.\n",
	positions_.size(), normals_.size(), colors_.size(), texcoords_.size(), indices_.size());
	return true;
	}

	JellyfishPrivate::JellyfishPrivate() :
	positionLocation_(0),
	normalLocation_(0),
	colorLocation_(0),
	texcoordLocation_(0),
	viewport_(512.0, 512.0),
	lightPosition_(10.0, 40.0, -60.0),
	lightColor_(0.8, 1.3, 1.1, 1.0),
	lightRadius_(200.0),
	ambientColor_(0.3, 0.2, 1.0, 1.0),
	fresnelColor_(0.8, 0.7, 0.6, 1.1),
	fresnelPower_(1.0),
	rotation_(0.0),
	currentTime_(0.0),
	lastUpdateTime_(0.0),
	cullFace_(0),
	depthTest_(0),
	blend_(0),
	blendFuncSrc_(0),
	blendFuncDst_(0)
	{
	}

	JellyfishPrivate::~JellyfishPrivate()
	{
	positions_.clear();
	normals_.clear();
	colors_.clear();
	texcoords_.clear();
	indices_.clear();
	}

	bool
	JellyfishPrivate::initialize()
	{
	static const string modelFilename(GLMARK_DATA_PATH"/models/jellyfish.jobj");
	if (!load_obj(modelFilename))
	{
	return false;
	}

	// Now that we've setup the vertex data, we can setup the map of how
	// that data will be laid out in the buffer object.
	static const unsigned int sv3(sizeof(vec3));
	dataMap_.positionOffset = 0;
	dataMap_.positionSize = positions_.size() * sv3;
	dataMap_.totalSize = dataMap_.positionSize;
	dataMap_.normalOffset = dataMap_.positionOffset + dataMap_.positionSize;
	dataMap_.normalSize = normals_.size() * sv3;
	dataMap_.totalSize += dataMap_.normalSize;
	dataMap_.colorOffset = dataMap_.normalOffset + dataMap_.normalSize;
	dataMap_.colorSize = colors_.size() * sv3;
	dataMap_.totalSize += dataMap_.colorSize;
	dataMap_.texcoordOffset = dataMap_.colorOffset + dataMap_.colorSize;
	dataMap_.texcoordSize = texcoords_.size() * sv3;
	dataMap_.totalSize += dataMap_.texcoordSize;

	lastUpdateTime_ = Util::get_timestamp_us() / 1000.0;
	currentTime_ = static_cast<uint64_t>(lastUpdateTime_) % 100000000 / 1000.0;
	whichCaustic_ = static_cast<uint64_t>(currentTime_ * 30) % 32 + 1;
	rotation_ = 0.0;

	if (!gradient_.init())
	{
	return false;
	}

	// Set up program first so we can store attribute and uniform locations
	// away for the
	using std::string;
	static const string vtx_shader_filename(GLMARK_DATA_PATH"/shaders/jellyfish.vert");
	static const string frg_shader_filename(GLMARK_DATA_PATH"/shaders/jellyfish.frag");

	ShaderSource vtx_source(vtx_shader_filename);
	ShaderSource frg_source(frg_shader_filename);

	if (!Scene::load_shaders_from_strings(program_, vtx_source.str(),
	frg_source.str()))
	{
	return false;
	}

	// Stash away attribute and uniform locations for handy use.
	positionLocation_ = program_["aVertexPosition"].location();
	normalLocation_ = program_["aVertexNormal"].location();
	colorLocation_ = program_["aVertexColor"].location();
	texcoordLocation_ = program_["aTextureCoord"].location();

	// We need 2 buffers for our work here. One for the vertex data.
	// and one for the index data.
	glGenBuffers(2, &bufferObjects_[0]);

	// First, setup the vertex data by binding the first buffer object,
	// allocating its data store, and filling it in with our vertex data.
	glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
	glBufferData(GL_ARRAY_BUFFER, dataMap_.totalSize, 0, GL_STATIC_DRAW);
	glBufferSubData(GL_ARRAY_BUFFER, dataMap_.positionOffset,
	dataMap_.positionSize, &positions_.front());
	glBufferSubData(GL_ARRAY_BUFFER, dataMap_.normalOffset,
	dataMap_.normalSize, &normals_.front());
	glBufferSubData(GL_ARRAY_BUFFER, dataMap_.colorOffset,
	dataMap_.colorSize, &colors_.front());
	glBufferSubData(GL_ARRAY_BUFFER, dataMap_.texcoordOffset,
	dataMap_.texcoordSize, &texcoords_.front());

	// Now repeat for our index data.
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices_.size() * sizeof(unsigned short),
	&indices_.front(), GL_STATIC_DRAW);

	// "Unbind" our buffer objects to make sure the state is consistent.
	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

	// Finally, set up our textures.
	//
	// First, the main jellyfish texture
	bool gotTex = Texture::load("jellyfish256", &textureObjects_[0], GL_LINEAR,
	GL_LINEAR, 0);
	if (!gotTex \|\| textureObjects_[0] == 0)
	{
	Log::error("Jellyfish texture set up failed!!!\n");
	return false;
	}
	glBindTexture(GL_TEXTURE_2D, 0);
	// Then, the caustics textures
	static const string baseName("jellyfish-caustics-");
	for (unsigned int i = 1; i < 33; i++)
	{
	std::stringstream ss;
	ss << std::setw(2) << std::setfill('0') << i;
	string curName(baseName);
	curName += ss.str();
	gotTex = Texture::load(curName, &textureObjects_[i], GL_LINEAR,
	GL_LINEAR, 0);
	if (!gotTex \|\| textureObjects_[i] == 0)
	{
	Log::error("Caustics texture[%u] set up failed!!!\n", i);
	return false;
	}
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glBindTexture(GL_TEXTURE_2D, 0);
	}

	// Save the GL state we are changing so we can restore it later.
	cullFace_ = glIsEnabled(GL_CULL_FACE);
	depthTest_ = glIsEnabled(GL_DEPTH_TEST);
	blend_ = glIsEnabled(GL_BLEND);
	glGetIntegerv(GL_BLEND_SRC_RGB, &blendFuncSrc_);
	glGetIntegerv(GL_BLEND_DST_RGB, &blendFuncDst_);

	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glEnable(GL_BLEND);
	glDisable(GL_CULL_FACE);
	glDisable(GL_DEPTH_TEST);

	return true;
	}

	void
	JellyfishPrivate::update_viewport(const vec2& vp)
	{
	if (viewport_.x() == vp.x() && viewport_.y() == vp.y())
	{
	return;
	}
	viewport_ = vp;
	projection_.loadIdentity();
	projection_.perspective(30.0, viewport_.x()/viewport_.y(), 20.0, 120.0);
	}

	void
	JellyfishPrivate::update_time()
	{
	double now = Util::get_timestamp_us() / 1000.0;
	double elapsedTime = now - lastUpdateTime_;
	rotation_ += (2.0 * elapsedTime) / 1000.0;
	currentTime_ = static_cast<uint64_t>(now) % 100000000 / 1000.0;
	whichCaustic_ = static_cast<uint64_t>(currentTime_ * 30) % 32 + 1;
	lastUpdateTime_ = now;
	}

	void
	JellyfishPrivate::cleanup()
	{
	// Restore the GL state we changed for the scene.
	glBlendFunc(blendFuncSrc_, blendFuncDst_);
	if (GL_FALSE == blend_)
	{
	glDisable(GL_BLEND);
	}
	if (GL_TRUE == cullFace_)
	{
	glEnable(GL_CULL_FACE);
	}
	if (GL_TRUE == depthTest_)
	{
	glEnable(GL_DEPTH_TEST);
	}

	program_.stop();
	program_.release();

	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

	glDeleteTextures(33, &textureObjects_[0]);
	glDeleteBuffers(2, &bufferObjects_[0]);

	gradient_.cleanup();
	}

	void
	JellyfishPrivate::draw()
	{
	// "Clear" the background to the desired gradient.
	gradient_.draw();

	// We need "world", "world view projection", and "world inverse transpose"
	// matrix uniforms for the current shader.
	//
	// NOTE: Some of this seems a bit of a no-op (e.g., multipying by and
	// inverting identity matrices), but leave it like the original
	// WebGL files for the time being. Worth revisiting not doing all
	// of that math every draw call (might even be good to be doing
	// some of it in the shader as well).
	world_.push();
	world_.translate(0.0, 5.0, -75.0);
	world_.rotate(sin(rotation_ / 10.0) * 30.0, 0.0, 1.0, 0.0);
	world_.rotate(sin(rotation_ / 20.0) * 30.0, 1.0, 0.0, 0.0);
	world_.scale(5.0, 5.0, 5.0);
	world_.translate(0.0, sin(rotation_ / 10.0) * 2.5, 0.0);
	mat4 worldViewProjection(projection_.getCurrent());
	worldViewProjection *= world_.getCurrent();;
	mat4 worldInverseTranspose(world_.getCurrent());
	worldInverseTranspose.inverse().transpose();

	// Load up the uniforms
	program_.start();
	program_["uWorld"] = world_.getCurrent();
	program_["uWorldViewProj"] = worldViewProjection;
	program_["uWorldInvTranspose"] = worldInverseTranspose;
	program_["uCurrentTime"] = currentTime_;
	// Revisit making these constants rather than uniforms as they appear never
	// to change
	program_["uLightPos"] = lightPosition_;
	program_["uLightRadius"] = lightRadius_;
	program_["uLightCol"] = lightColor_;
	program_["uAmbientCol"] = ambientColor_;
	program_["uFresnelCol"] = fresnelColor_;
	program_["uFresnelPower"] = fresnelPower_;
	// Set up textures for this frame.
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, textureObjects_[0]);
	program_["uSampler"] = 0;
	glActiveTexture(GL_TEXTURE1);
	glBindTexture(GL_TEXTURE_2D, textureObjects_[whichCaustic_]);
	program_["uSampler1"] = 1;

	glBindBuffer(GL_ARRAY_BUFFER, bufferObjects_[0]);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferObjects_[1]);

	glEnableVertexAttribArray(positionLocation_);
	glEnableVertexAttribArray(normalLocation_);
	glEnableVertexAttribArray(colorLocation_);
	glEnableVertexAttribArray(texcoordLocation_);
	glVertexAttribPointer(positionLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
	reinterpret_cast<const GLvoid*>(dataMap_.positionOffset));
	glVertexAttribPointer(normalLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
	reinterpret_cast<const GLvoid*>(dataMap_.normalOffset));
	glVertexAttribPointer(colorLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
	reinterpret_cast<const GLvoid*>(dataMap_.colorOffset));
	glVertexAttribPointer(texcoordLocation_ , 3, GL_FLOAT, GL_FALSE, 0,
	reinterpret_cast<const GLvoid*>(dataMap_.texcoordOffset));

	glDrawElements(GL_TRIANGLES, indices_.size(), GL_UNSIGNED_SHORT, 0);

	glDisableVertexAttribArray(positionLocation_);
	glDisableVertexAttribArray(normalLocation_);
	glDisableVertexAttribArray(colorLocation_);
	glDisableVertexAttribArray(texcoordLocation_);

	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

	program_.stop();
	world_.pop();
	}