////  DeferredLightingEffect.cpp//  interface/src/renderer////  Created by Andrzej Kapolka on 9/11/14.//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// // include this before QOpenGLFramebufferObject, which includes an earlier version of OpenGL#include "InterfaceConfig.h" #include <QOpenGLFramebufferObject> #include "Application.h"#include "DeferredLightingEffect.h"#include "RenderUtil.h" void DeferredLightingEffect::init() {    loadLightProgram("shaders/directional_light.frag", _directionalLight, _directionalLightLocations);    loadLightProgram("shaders/directional_light_shadow_map.frag", _directionalLightShadowMap,        _directionalLightShadowMapLocations);    loadLightProgram("shaders/directional_light_cascaded_shadow_map.frag", _directionalLightCascadedShadowMap,        _directionalLightCascadedShadowMapLocations);} void DeferredLightingEffect::prepare() {    // clear the normal buffer    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(false, true);    glClear(GL_COLOR_BUFFER_BIT);    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, false);} void DeferredLightingEffect::render() {    // perform deferred lighting, rendering to free fbo    glPushMatrix();    glLoadIdentity();        glMatrixMode(GL_PROJECTION);    glPushMatrix();    glLoadIdentity();        glDisable(GL_BLEND);    glDisable(GL_LIGHTING);    glDisable(GL_DEPTH_TEST);    glDisable(GL_COLOR_MATERIAL);    glDepthMask(false);        QOpenGLFramebufferObject* primaryFBO = Application::getInstance()->getTextureCache()->getPrimaryFramebufferObject();    primaryFBO->release();        QOpenGLFramebufferObject* freeFBO = Application::getInstance()->getGlowEffect()->getFreeFramebufferObject();    freeFBO->bind();    glClear(GL_COLOR_BUFFER_BIT);        glBindTexture(GL_TEXTURE_2D, primaryFBO->texture());        glActiveTexture(GL_TEXTURE1);    glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getPrimaryNormalTextureID());        // get the viewport side (left, right, both)    int viewport[4];    glGetIntegerv(GL_VIEWPORT, viewport);    const int VIEWPORT_X_INDEX = 0;    const int VIEWPORT_WIDTH_INDEX = 2;    float sMin = viewport[VIEWPORT_X_INDEX] / (float)primaryFBO->width();    float sWidth = viewport[VIEWPORT_WIDTH_INDEX] / (float)primaryFBO->width();            if (Menu::getInstance()->getShadowsEnabled()) {        glActiveTexture(GL_TEXTURE2);        glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getPrimaryDepthTextureID());                glActiveTexture(GL_TEXTURE3);        glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getShadowDepthTextureID());                ProgramObject* program = &_directionalLightShadowMap;        const LightLocations* locations = &_directionalLightShadowMapLocations;        if (Menu::getInstance()->isOptionChecked(MenuOption::CascadedShadows)) {            program = &_directionalLightCascadedShadowMap;            locations = &_directionalLightCascadedShadowMapLocations;            _directionalLightCascadedShadowMap.bind();            _directionalLightCascadedShadowMap.setUniform(locations->shadowDistances,                Application::getInstance()->getShadowDistances());                } else {            program->bind();        }        program->setUniformValue(locations->shadowScale,            1.0f / Application::getInstance()->getTextureCache()->getShadowFramebufferObject()->width());                float left, right, bottom, top, nearVal, farVal;        glm::vec4 nearClipPlane, farClipPlane;        Application::getInstance()->computeOffAxisFrustum(            left, right, bottom, top, nearVal, farVal, nearClipPlane, farClipPlane);        program->setUniformValue(locations->nearLocation, nearVal);        program->setUniformValue(locations->depthScale, (farVal - nearVal) / farVal);        float nearScale = -1.0f / nearVal;        float sScale = 1.0f / sWidth;        float depthTexCoordScaleS = (right - left) * nearScale * sScale;        program->setUniformValue(locations->depthTexCoordOffset, left * nearScale - sMin * depthTexCoordScaleS,            bottom * nearScale);        program->setUniformValue(locations->depthTexCoordScale, depthTexCoordScaleS, (top - bottom) * nearScale);                renderFullscreenQuad(sMin, sMin + sWidth);                program->release();                glBindTexture(GL_TEXTURE_2D, 0);                glActiveTexture(GL_TEXTURE2);        glBindTexture(GL_TEXTURE_2D, 0);                glActiveTexture(GL_TEXTURE1);        } else {        _directionalLight.bind();        renderFullscreenQuad(sMin, sMin + sWidth);        _directionalLight.release();            }        glBindTexture(GL_TEXTURE_2D, 0);    glActiveTexture(GL_TEXTURE0);        freeFBO->release();        // now transfer the lit region to the primary fbo    glEnable(GL_BLEND);        primaryFBO->bind();        glBindTexture(GL_TEXTURE_2D, freeFBO->texture());    glEnable(GL_TEXTURE_2D);        glColor4f(1.0f, 1.0f, 1.0f, 1.0f);        renderFullscreenQuad(sMin, sMin + sWidth);        glBindTexture(GL_TEXTURE_2D, 0);    glDisable(GL_TEXTURE_2D);        glEnable(GL_LIGHTING);    glEnable(GL_COLOR_MATERIAL);    glEnable(GL_DEPTH_TEST);    glDepthMask(true);        glDisable(GL_ALPHA_TEST);        glPopMatrix();        glMatrixMode(GL_MODELVIEW);    glPopMatrix();} void DeferredLightingEffect::loadLightProgram(const char* name, ProgramObject& program, LightLocations& locations) {    program.addShaderFromSourceFile(QGLShader::Fragment, Application::resourcesPath() + name);    program.link();        program.bind();    program.setUniformValue("diffuseMap", 0);    program.setUniformValue("normalMap", 1);    program.setUniformValue("depthMap", 2);    program.setUniformValue("shadowMap", 3);    locations.shadowDistances = program.uniformLocation("shadowDistances");    locations.shadowScale = program.uniformLocation("shadowScale");    locations.nearLocation = program.uniformLocation("near");    locations.depthScale = program.uniformLocation("depthScale");    locations.depthTexCoordOffset = program.uniformLocation("depthTexCoordOffset");    locations.depthTexCoordScale = program.uniformLocation("depthTexCoordScale");    program.release();}