void DeferredLightingEffect::render(RenderArgs* args) {
// perform deferred lighting, rendering to free fbo
glDisable(GL_BLEND);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
glDisable(GL_COLOR_MATERIAL);
glDepthMask(false);
auto textureCache = DependencyManager::get<TextureCache>();
glBindFramebuffer(GL_FRAMEBUFFER, 0 );
QSize framebufferSize = textureCache->getFrameBufferSize();
// binding the first framebuffer
auto freeFBO = DependencyManager::get<GlowEffect>()->getFreeFramebuffer();
glBindFramebuffer(GL_FRAMEBUFFER, gpu::GLBackend::getFramebufferID(freeFBO));
glClear(GL_COLOR_BUFFER_BIT);
// glEnable(GL_FRAMEBUFFER_SRGB);
// glBindTexture(GL_TEXTURE_2D, primaryFBO->texture());
glBindTexture(GL_TEXTURE_2D, textureCache->getPrimaryColorTextureID());
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, textureCache->getPrimaryNormalTextureID());
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, textureCache->getPrimarySpecularTextureID());
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, textureCache->getPrimaryDepthTextureID());
// get the viewport side (left, right, both)
int viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);
const int VIEWPORT_X_INDEX = 0;
const int VIEWPORT_Y_INDEX = 1;
const int VIEWPORT_WIDTH_INDEX = 2;
const int VIEWPORT_HEIGHT_INDEX = 3;
float sMin = viewport[VIEWPORT_X_INDEX] / (float)framebufferSize.width();
float sWidth = viewport[VIEWPORT_WIDTH_INDEX] / (float)framebufferSize.width();
float tMin = viewport[VIEWPORT_Y_INDEX] / (float)framebufferSize.height();
float tHeight = viewport[VIEWPORT_HEIGHT_INDEX] / (float)framebufferSize.height();
bool useSkyboxCubemap = (_skybox) && (_skybox->getCubemap());
// Fetch the ViewMatrix;
glm::mat4 invViewMat;
_viewState->getViewTransform().getMatrix(invViewMat);
ProgramObject* program = &_directionalLight;
const LightLocations* locations = &_directionalLightLocations;
bool shadowsEnabled = _viewState->getShadowsEnabled();
if (shadowsEnabled) {
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_2D, textureCache->getShadowDepthTextureID());
program = &_directionalLightShadowMap;
locations = &_directionalLightShadowMapLocations;
if (_viewState->getCascadeShadowsEnabled()) {
program = &_directionalLightCascadedShadowMap;
locations = &_directionalLightCascadedShadowMapLocations;
if (useSkyboxCubemap) {
program = &_directionalSkyboxLightCascadedShadowMap;
locations = &_directionalSkyboxLightCascadedShadowMapLocations;
} else if (_ambientLightMode > -1) {
program = &_directionalAmbientSphereLightCascadedShadowMap;
locations = &_directionalAmbientSphereLightCascadedShadowMapLocations;
}
program->bind();
program->setUniform(locations->shadowDistances, _viewState->getShadowDistances());
} else {
if (useSkyboxCubemap) {
program = &_directionalSkyboxLightShadowMap;
locations = &_directionalSkyboxLightShadowMapLocations;
} else if (_ambientLightMode > -1) {
program = &_directionalAmbientSphereLightShadowMap;
locations = &_directionalAmbientSphereLightShadowMapLocations;
}
program->bind();
}
program->setUniformValue(locations->shadowScale,
1.0f / textureCache->getShadowFramebuffer()->getWidth());
} else {
if (useSkyboxCubemap) {
program = &_directionalSkyboxLight;
locations = &_directionalSkyboxLightLocations;
} else if (_ambientLightMode > -1) {
program = &_directionalAmbientSphereLight;
locations = &_directionalAmbientSphereLightLocations;
}
program->bind();
}
{
auto globalLight = _allocatedLights[_globalLights.front()];
if (locations->ambientSphere >= 0) {
gpu::SphericalHarmonics sh = globalLight->getAmbientSphere();
if (useSkyboxCubemap && _skybox->getCubemap()->getIrradiance()) {
sh = (*_skybox->getCubemap()->getIrradiance());
}
for (int i =0; i <gpu::SphericalHarmonics::NUM_COEFFICIENTS; i++) {
program->setUniformValue(locations->ambientSphere + i, *(((QVector4D*) &sh) + i));
}
}
if (useSkyboxCubemap) {
glActiveTexture(GL_TEXTURE5);
glBindTexture(GL_TEXTURE_CUBE_MAP, gpu::GLBackend::getTextureID(_skybox->getCubemap()));
}
if (locations->lightBufferUnit >= 0) {
gpu::Batch batch;
batch.setUniformBuffer(locations->lightBufferUnit, globalLight->getSchemaBuffer());
gpu::GLBackend::renderBatch(batch);
}
if (_atmosphere && (locations->atmosphereBufferUnit >= 0)) {
gpu::Batch batch;
batch.setUniformBuffer(locations->atmosphereBufferUnit, _atmosphere->getDataBuffer());
gpu::GLBackend::renderBatch(batch);
}
glUniformMatrix4fv(locations->invViewMat, 1, false, reinterpret_cast< const GLfloat* >(&invViewMat));
}
float left, right, bottom, top, nearVal, farVal;
glm::vec4 nearClipPlane, farClipPlane;
_viewState->computeOffAxisFrustum(left, right, bottom, top, nearVal, farVal, nearClipPlane, farClipPlane);
program->setUniformValue(locations->nearLocation, nearVal);
float depthScale = (farVal - nearVal) / farVal;
program->setUniformValue(locations->depthScale, depthScale);
float nearScale = -1.0f / nearVal;
float depthTexCoordScaleS = (right - left) * nearScale / sWidth;
float depthTexCoordScaleT = (top - bottom) * nearScale / tHeight;
float depthTexCoordOffsetS = left * nearScale - sMin * depthTexCoordScaleS;
float depthTexCoordOffsetT = bottom * nearScale - tMin * depthTexCoordScaleT;
program->setUniformValue(locations->depthTexCoordOffset, depthTexCoordOffsetS, depthTexCoordOffsetT);
program->setUniformValue(locations->depthTexCoordScale, depthTexCoordScaleS, depthTexCoordScaleT);
renderFullscreenQuad(sMin, sMin + sWidth, tMin, tMin + tHeight);
program->release();
if (useSkyboxCubemap) {
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
if (!shadowsEnabled) {
glActiveTexture(GL_TEXTURE3);
}
}
if (shadowsEnabled) {
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE3);
}
// additive blending
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
glEnable(GL_CULL_FACE);
glm::vec4 sCoefficients(sWidth / 2.0f, 0.0f, 0.0f, sMin + sWidth / 2.0f);
glm::vec4 tCoefficients(0.0f, tHeight / 2.0f, 0.0f, tMin + tHeight / 2.0f);
glTexGenfv(GL_S, GL_OBJECT_PLANE, (const GLfloat*)&sCoefficients);
glTexGenfv(GL_T, GL_OBJECT_PLANE, (const GLfloat*)&tCoefficients);
// enlarge the scales slightly to account for tesselation
const float SCALE_EXPANSION = 0.05f;
const glm::vec3& eyePoint = _viewState->getCurrentViewFrustum()->getPosition();
float nearRadius = glm::distance(eyePoint, _viewState->getCurrentViewFrustum()->getNearTopLeft());
auto geometryCache = DependencyManager::get<GeometryCache>();
if (!_pointLights.empty()) {
_pointLight.bind();
_pointLight.setUniformValue(_pointLightLocations.nearLocation, nearVal);
_pointLight.setUniformValue(_pointLightLocations.depthScale, depthScale);
_pointLight.setUniformValue(_pointLightLocations.depthTexCoordOffset, depthTexCoordOffsetS, depthTexCoordOffsetT);
_pointLight.setUniformValue(_pointLightLocations.depthTexCoordScale, depthTexCoordScaleS, depthTexCoordScaleT);
for (auto lightID : _pointLights) {
auto light = _allocatedLights[lightID];
if (_pointLightLocations.lightBufferUnit >= 0) {
gpu::Batch batch;
batch.setUniformBuffer(_pointLightLocations.lightBufferUnit, light->getSchemaBuffer());
gpu::GLBackend::renderBatch(batch);
}
glUniformMatrix4fv(_pointLightLocations.invViewMat, 1, false, reinterpret_cast< const GLfloat* >(&invViewMat));
glPushMatrix();
float expandedRadius = light->getMaximumRadius() * (1.0f + SCALE_EXPANSION);
if (glm::distance(eyePoint, glm::vec3(light->getPosition())) < expandedRadius + nearRadius) {
glLoadIdentity();
glTranslatef(0.0f, 0.0f, -1.0f);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
renderFullscreenQuad();
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
} else {
glTranslatef(light->getPosition().x, light->getPosition().y, light->getPosition().z);
geometryCache->renderSphere(expandedRadius, 32, 32, glm::vec4(1.0f, 1.0f, 1.0f, 1.0f));
}
glPopMatrix();
}
_pointLights.clear();
_pointLight.release();
}
if (!_spotLights.empty()) {
_spotLight.bind();
_spotLight.setUniformValue(_spotLightLocations.nearLocation, nearVal);
_spotLight.setUniformValue(_spotLightLocations.depthScale, depthScale);
_spotLight.setUniformValue(_spotLightLocations.depthTexCoordOffset, depthTexCoordOffsetS, depthTexCoordOffsetT);
_spotLight.setUniformValue(_spotLightLocations.depthTexCoordScale, depthTexCoordScaleS, depthTexCoordScaleT);
for (auto lightID : _spotLights) {
auto light = _allocatedLights[lightID];
if (_spotLightLocations.lightBufferUnit >= 0) {
gpu::Batch batch;
batch.setUniformBuffer(_spotLightLocations.lightBufferUnit, light->getSchemaBuffer());
gpu::GLBackend::renderBatch(batch);
}
glUniformMatrix4fv(_spotLightLocations.invViewMat, 1, false, reinterpret_cast< const GLfloat* >(&invViewMat));
glPushMatrix();
float expandedRadius = light->getMaximumRadius() * (1.0f + SCALE_EXPANSION);
float edgeRadius = expandedRadius / glm::cos(light->getSpotAngle());
if (glm::distance(eyePoint, glm::vec3(light->getPosition())) < edgeRadius + nearRadius) {
glLoadIdentity();
glTranslatef(0.0f, 0.0f, -1.0f);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
renderFullscreenQuad();
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
} else {
glTranslatef(light->getPosition().x, light->getPosition().y, light->getPosition().z);
glm::quat spotRotation = rotationBetween(glm::vec3(0.0f, 0.0f, -1.0f), light->getDirection());
glm::vec3 axis = glm::axis(spotRotation);
glRotatef(glm::degrees(glm::angle(spotRotation)), axis.x, axis.y, axis.z);
glTranslatef(0.0f, 0.0f, -light->getMaximumRadius() * (1.0f + SCALE_EXPANSION * 0.5f));
geometryCache->renderCone(expandedRadius * glm::tan(light->getSpotAngle()),
expandedRadius, 32, 1);
}
glPopMatrix();
}
_spotLights.clear();
_spotLight.release();
}
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, 0);
// glDisable(GL_FRAMEBUFFER_SRGB);
// End of the Lighting pass
}
void DeferredLightingEffect::render(const render::RenderContextPointer& renderContext) {
auto args = renderContext->args;
gpu::doInBatch(args->_context, [&](gpu::Batch& batch) {
// Allocate the parameters buffer used by all the deferred shaders
if (!_deferredTransformBuffer[0]._buffer) {
DeferredTransform parameters;
_deferredTransformBuffer[0] = gpu::BufferView(std::make_shared<gpu::Buffer>(sizeof(DeferredTransform), (const gpu::Byte*) ¶meters));
_deferredTransformBuffer[1] = gpu::BufferView(std::make_shared<gpu::Buffer>(sizeof(DeferredTransform), (const gpu::Byte*) ¶meters));
}
// Framebuffer copy operations cannot function as multipass stereo operations.
batch.enableStereo(false);
// perform deferred lighting, rendering to free fbo
auto framebufferCache = DependencyManager::get<FramebufferCache>();
auto textureCache = DependencyManager::get<TextureCache>();
QSize framebufferSize = framebufferCache->getFrameBufferSize();
// binding the first framebuffer
auto lightingFBO = framebufferCache->getLightingFramebuffer();
batch.setFramebuffer(lightingFBO);
batch.setViewportTransform(args->_viewport);
batch.setStateScissorRect(args->_viewport);
// Bind the G-Buffer surfaces
batch.setResourceTexture(DEFERRED_BUFFER_COLOR_UNIT, framebufferCache->getDeferredColorTexture());
batch.setResourceTexture(DEFERRED_BUFFER_NORMAL_UNIT, framebufferCache->getDeferredNormalTexture());
batch.setResourceTexture(DEFERRED_BUFFER_EMISSIVE_UNIT, framebufferCache->getDeferredSpecularTexture());
batch.setResourceTexture(DEFERRED_BUFFER_DEPTH_UNIT, framebufferCache->getPrimaryDepthTexture());
// FIXME: Different render modes should have different tasks
if (args->_renderMode == RenderArgs::DEFAULT_RENDER_MODE && _ambientOcclusionEnabled) {
batch.setResourceTexture(DEFERRED_BUFFER_OBSCURANCE_UNIT, framebufferCache->getOcclusionTexture());
} else {
// need to assign the white texture if ao is off
batch.setResourceTexture(DEFERRED_BUFFER_OBSCURANCE_UNIT, textureCache->getWhiteTexture());
}
assert(_lightStage.lights.size() > 0);
const auto& globalShadow = _lightStage.lights[0]->shadow;
// Bind the shadow buffer
batch.setResourceTexture(SHADOW_MAP_UNIT, globalShadow.map);
// THe main viewport is assumed to be the mono viewport (or the 2 stereo faces side by side within that viewport)
auto monoViewport = args->_viewport;
float sMin = args->_viewport.x / (float)framebufferSize.width();
float sWidth = args->_viewport.z / (float)framebufferSize.width();
float tMin = args->_viewport.y / (float)framebufferSize.height();
float tHeight = args->_viewport.w / (float)framebufferSize.height();
// The view frustum is the mono frustum base
auto viewFrustum = args->_viewFrustum;
// Eval the mono projection
mat4 monoProjMat;
viewFrustum->evalProjectionMatrix(monoProjMat);
// The mono view transform
Transform monoViewTransform;
viewFrustum->evalViewTransform(monoViewTransform);
// THe mono view matrix coming from the mono view transform
glm::mat4 monoViewMat;
monoViewTransform.getMatrix(monoViewMat);
// Running in stero ?
bool isStereo = args->_context->isStereo();
int numPasses = 1;
mat4 projMats[2];
Transform viewTransforms[2];
ivec4 viewports[2];
vec4 clipQuad[2];
vec2 screenBottomLeftCorners[2];
vec2 screenTopRightCorners[2];
vec4 fetchTexcoordRects[2];
DeferredTransform deferredTransforms[2];
auto geometryCache = DependencyManager::get<GeometryCache>();
if (isStereo) {
numPasses = 2;
mat4 eyeViews[2];
args->_context->getStereoProjections(projMats);
args->_context->getStereoViews(eyeViews);
float halfWidth = 0.5f * sWidth;
for (int i = 0; i < numPasses; i++) {
// In stereo, the 2 sides are layout side by side in the mono viewport and their width is half
int sideWidth = monoViewport.z >> 1;
viewports[i] = ivec4(monoViewport.x + (i * sideWidth), monoViewport.y, sideWidth, monoViewport.w);
deferredTransforms[i].projection = projMats[i];
auto sideViewMat = monoViewMat * glm::inverse(eyeViews[i]);
viewTransforms[i].evalFromRawMatrix(sideViewMat);
deferredTransforms[i].viewInverse = sideViewMat;
deferredTransforms[i].stereoSide = (i == 0 ? -1.0f : 1.0f);
clipQuad[i] = glm::vec4(sMin + i * halfWidth, tMin, halfWidth, tHeight);
screenBottomLeftCorners[i] = glm::vec2(-1.0f + i * 1.0f, -1.0f);
screenTopRightCorners[i] = glm::vec2(i * 1.0f, 1.0f);
fetchTexcoordRects[i] = glm::vec4(sMin + i * halfWidth, tMin, halfWidth, tHeight);
}
} else {
viewports[0] = monoViewport;
projMats[0] = monoProjMat;
deferredTransforms[0].projection = monoProjMat;
deferredTransforms[0].viewInverse = monoViewMat;
viewTransforms[0] = monoViewTransform;
deferredTransforms[0].stereoSide = 0.0f;
clipQuad[0] = glm::vec4(sMin, tMin, sWidth, tHeight);
screenBottomLeftCorners[0] = glm::vec2(-1.0f, -1.0f);
screenTopRightCorners[0] = glm::vec2(1.0f, 1.0f);
fetchTexcoordRects[0] = glm::vec4(sMin, tMin, sWidth, tHeight);
}
auto eyePoint = viewFrustum->getPosition();
float nearRadius = glm::distance(eyePoint, viewFrustum->getNearTopLeft());
for (int side = 0; side < numPasses; side++) {
// Render in this side's viewport
batch.setViewportTransform(viewports[side]);
batch.setStateScissorRect(viewports[side]);
// Sync and Bind the correct DeferredTransform ubo
_deferredTransformBuffer[side]._buffer->setSubData(0, sizeof(DeferredTransform), (const gpu::Byte*) &deferredTransforms[side]);
batch.setUniformBuffer(_directionalLightLocations->deferredTransformBuffer, _deferredTransformBuffer[side]);
glm::vec2 topLeft(-1.0f, -1.0f);
glm::vec2 bottomRight(1.0f, 1.0f);
glm::vec2 texCoordTopLeft(clipQuad[side].x, clipQuad[side].y);
glm::vec2 texCoordBottomRight(clipQuad[side].x + clipQuad[side].z, clipQuad[side].y + clipQuad[side].w);
// First Global directional light and ambient pass
{
auto& program = _shadowMapEnabled ? _directionalLightShadow : _directionalLight;
LightLocationsPtr locations = _shadowMapEnabled ? _directionalLightShadowLocations : _directionalLightLocations;
const auto& keyLight = _allocatedLights[_globalLights.front()];
// Setup the global directional pass pipeline
{
if (_shadowMapEnabled) {
if (keyLight->getAmbientMap()) {
program = _directionalSkyboxLightShadow;
locations = _directionalSkyboxLightShadowLocations;
} else {
program = _directionalAmbientSphereLightShadow;
locations = _directionalAmbientSphereLightShadowLocations;
}
} else {
if (keyLight->getAmbientMap()) {
program = _directionalSkyboxLight;
locations = _directionalSkyboxLightLocations;
} else {
program = _directionalAmbientSphereLight;
locations = _directionalAmbientSphereLightLocations;
}
}
if (locations->shadowTransformBuffer >= 0) {
batch.setUniformBuffer(locations->shadowTransformBuffer, globalShadow.getBuffer());
}
batch.setPipeline(program);
}
{ // Setup the global lighting
setupKeyLightBatch(batch, locations->lightBufferUnit, SKYBOX_MAP_UNIT);
}
{
batch.setModelTransform(Transform());
batch.setProjectionTransform(glm::mat4());
batch.setViewTransform(Transform());
glm::vec4 color(1.0f, 1.0f, 1.0f, 1.0f);
geometryCache->renderQuad(batch, topLeft, bottomRight, texCoordTopLeft, texCoordBottomRight, color);
}
if (keyLight->getAmbientMap()) {
batch.setResourceTexture(SKYBOX_MAP_UNIT, nullptr);
}
}
auto texcoordMat = glm::mat4();
/* texcoordMat[0] = glm::vec4(sWidth / 2.0f, 0.0f, 0.0f, sMin + sWidth / 2.0f);
texcoordMat[1] = glm::vec4(0.0f, tHeight / 2.0f, 0.0f, tMin + tHeight / 2.0f);
*/ texcoordMat[0] = glm::vec4(fetchTexcoordRects[side].z / 2.0f, 0.0f, 0.0f, fetchTexcoordRects[side].x + fetchTexcoordRects[side].z / 2.0f);
texcoordMat[1] = glm::vec4(0.0f, fetchTexcoordRects[side].w / 2.0f, 0.0f, fetchTexcoordRects[side].y + fetchTexcoordRects[side].w / 2.0f);
texcoordMat[2] = glm::vec4(0.0f, 0.0f, 1.0f, 0.0f);
texcoordMat[3] = glm::vec4(0.0f, 0.0f, 0.0f, 1.0f);
// enlarge the scales slightly to account for tesselation
const float SCALE_EXPANSION = 0.05f;
batch.setProjectionTransform(projMats[side]);
batch.setViewTransform(viewTransforms[side]);
// Splat Point lights
if (!_pointLights.empty()) {
batch.setPipeline(_pointLight);
batch._glUniformMatrix4fv(_pointLightLocations->texcoordMat, 1, false, reinterpret_cast< const float* >(&texcoordMat));
for (auto lightID : _pointLights) {
auto& light = _allocatedLights[lightID];
// IN DEBUG: light->setShowContour(true);
batch.setUniformBuffer(_pointLightLocations->lightBufferUnit, light->getSchemaBuffer());
float expandedRadius = light->getMaximumRadius() * (1.0f + SCALE_EXPANSION);
// TODO: We shouldn;t have to do that test and use a different volume geometry for when inside the vlight volume,
// we should be able to draw thre same geometry use DepthClamp but for unknown reason it's s not working...
if (glm::distance(eyePoint, glm::vec3(light->getPosition())) < expandedRadius + nearRadius) {
Transform model;
model.setTranslation(glm::vec3(0.0f, 0.0f, -1.0f));
batch.setModelTransform(model);
batch.setViewTransform(Transform());
batch.setProjectionTransform(glm::mat4());
glm::vec4 color(1.0f, 1.0f, 1.0f, 1.0f);
DependencyManager::get<GeometryCache>()->renderQuad(batch, topLeft, bottomRight, texCoordTopLeft, texCoordBottomRight, color);
batch.setProjectionTransform(projMats[side]);
batch.setViewTransform(viewTransforms[side]);
} else {
Transform model;
model.setTranslation(glm::vec3(light->getPosition().x, light->getPosition().y, light->getPosition().z));
batch.setModelTransform(model.postScale(expandedRadius));
batch._glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
geometryCache->renderSphere(batch);
}
}
}
// Splat spot lights
if (!_spotLights.empty()) {
batch.setPipeline(_spotLight);
batch._glUniformMatrix4fv(_spotLightLocations->texcoordMat, 1, false, reinterpret_cast< const float* >(&texcoordMat));
for (auto lightID : _spotLights) {
auto light = _allocatedLights[lightID];
// IN DEBUG: light->setShowContour(true);
batch.setUniformBuffer(_spotLightLocations->lightBufferUnit, light->getSchemaBuffer());
auto eyeLightPos = eyePoint - light->getPosition();
auto eyeHalfPlaneDistance = glm::dot(eyeLightPos, light->getDirection());
const float TANGENT_LENGTH_SCALE = 0.666f;
glm::vec4 coneParam(light->getSpotAngleCosSin(), TANGENT_LENGTH_SCALE * tanf(0.5f * light->getSpotAngle()), 1.0f);
float expandedRadius = light->getMaximumRadius() * (1.0f + SCALE_EXPANSION);
// TODO: We shouldn;t have to do that test and use a different volume geometry for when inside the vlight volume,
// we should be able to draw thre same geometry use DepthClamp but for unknown reason it's s not working...
if ((eyeHalfPlaneDistance > -nearRadius) &&
(glm::distance(eyePoint, glm::vec3(light->getPosition())) < expandedRadius + nearRadius)) {
coneParam.w = 0.0f;
batch._glUniform4fv(_spotLightLocations->coneParam, 1, reinterpret_cast< const float* >(&coneParam));
Transform model;
model.setTranslation(glm::vec3(0.0f, 0.0f, -1.0f));
batch.setModelTransform(model);
batch.setViewTransform(Transform());
batch.setProjectionTransform(glm::mat4());
glm::vec4 color(1.0f, 1.0f, 1.0f, 1.0f);
DependencyManager::get<GeometryCache>()->renderQuad(batch, topLeft, bottomRight, texCoordTopLeft, texCoordBottomRight, color);
batch.setProjectionTransform( projMats[side]);
batch.setViewTransform(viewTransforms[side]);
} else {
coneParam.w = 1.0f;
batch._glUniform4fv(_spotLightLocations->coneParam, 1, reinterpret_cast< const float* >(&coneParam));
Transform model;
model.setTranslation(light->getPosition());
model.postRotate(light->getOrientation());
model.postScale(glm::vec3(expandedRadius, expandedRadius, expandedRadius));
batch.setModelTransform(model);
auto mesh = getSpotLightMesh();
batch.setIndexBuffer(mesh->getIndexBuffer());
batch.setInputBuffer(0, mesh->getVertexBuffer());
batch.setInputFormat(mesh->getVertexFormat());
auto& part = mesh->getPartBuffer().get<model::Mesh::Part>();
batch.drawIndexed(model::Mesh::topologyToPrimitive(part._topology), part._numIndices, part._startIndex);
}
}
}
}
// Probably not necessary in the long run because the gpu layer would unbound this texture if used as render target
batch.setResourceTexture(DEFERRED_BUFFER_COLOR_UNIT, nullptr);
batch.setResourceTexture(DEFERRED_BUFFER_NORMAL_UNIT, nullptr);
batch.setResourceTexture(DEFERRED_BUFFER_EMISSIVE_UNIT, nullptr);
batch.setResourceTexture(DEFERRED_BUFFER_DEPTH_UNIT, nullptr);
batch.setResourceTexture(DEFERRED_BUFFER_OBSCURANCE_UNIT, nullptr);
batch.setResourceTexture(SHADOW_MAP_UNIT, nullptr);
batch.setResourceTexture(SKYBOX_MAP_UNIT, nullptr);
batch.setUniformBuffer(_directionalLightLocations->deferredTransformBuffer, nullptr);
});
glm::ivec3 LightClusters::updateClusters() {
// Make sure resource are in good shape
updateClusterResource();
// Clean up last info
uint32_t numClusters = (uint32_t)_clusterGrid.size();
std::vector< std::vector< LightIndex > > clusterGridPoint(numClusters);
std::vector< std::vector< LightIndex > > clusterGridSpot(numClusters);
_clusterGrid.clear();
_clusterGrid.resize(numClusters, EMPTY_CLUSTER);
uint32_t maxNumIndices = (uint32_t)_clusterContent.size();
_clusterContent.clear();
_clusterContent.resize(maxNumIndices, INVALID_LIGHT);
auto theFrustumGrid(_frustumGridBuffer.get());
glm::ivec3 gridPosToOffset(1, theFrustumGrid.dims.x, theFrustumGrid.dims.x * theFrustumGrid.dims.y);
uint32_t numClusterTouched = 0;
uint32_t numLightsIn = _visibleLightIndices[0];
uint32_t numClusteredLights = 0;
for (size_t lightNum = 1; lightNum < _visibleLightIndices.size(); ++lightNum) {
auto lightId = _visibleLightIndices[lightNum];
auto light = _lightStage->getLight(lightId);
if (!light) {
continue;
}
auto worldOri = light->getPosition();
auto radius = light->getMaximumRadius();
bool isSpot = light->isSpot();
// Bring into frustum eye space
auto eyeOri = theFrustumGrid.frustumGrid_worldToEye(glm::vec4(worldOri, 1.0f));
// Remove light that slipped through and is not in the z range
float eyeZMax = eyeOri.z - radius;
if (eyeZMax > -theFrustumGrid.rangeNear) {
continue;
}
float eyeZMin = eyeOri.z + radius;
bool beyondFar = false;
if (eyeZMin < -theFrustumGrid.rangeFar) {
beyondFar = true;
}
// Get z slices
int zMin = theFrustumGrid.frustumGrid_eyeDepthToClusterLayer(eyeZMin);
int zMax = theFrustumGrid.frustumGrid_eyeDepthToClusterLayer(eyeZMax);
// That should never happen
if (zMin == -2 && zMax == -2) {
continue;
}
// Before Range NEar just apss, range neatr == true near for now
if ((zMin == -1) && (zMax == -1)) {
continue;
}
// CLamp the z range
zMin = std::max(0, zMin);
auto xLeftDistance = radius - distanceToPlane(eyeOri, _gridPlanes[0][0]);
auto xRightDistance = radius + distanceToPlane(eyeOri, _gridPlanes[0].back());
auto yBottomDistance = radius - distanceToPlane(eyeOri, _gridPlanes[1][0]);
auto yTopDistance = radius + distanceToPlane(eyeOri, _gridPlanes[1].back());
if ((xLeftDistance < 0.f) || (xRightDistance < 0.f) || (yBottomDistance < 0.f) || (yTopDistance < 0.f)) {
continue;
}
// find 2D corners of the sphere in grid
int xMin { 0 };
int xMax { theFrustumGrid.dims.x - 1 };
int yMin { 0 };
int yMax { theFrustumGrid.dims.y - 1 };
float radius2 = radius * radius;
auto eyeOriH = glm::vec3(eyeOri);
auto eyeOriV = glm::vec3(eyeOri);
eyeOriH.y = 0.0f;
eyeOriV.x = 0.0f;
float eyeOriLen2H = glm::length2(eyeOriH);
float eyeOriLen2V = glm::length2(eyeOriV);
if ((eyeOriLen2H > radius2)) {
float eyeOriLenH = sqrt(eyeOriLen2H);
auto eyeOriDirH = glm::vec3(eyeOriH) / eyeOriLenH;
float eyeToTangentCircleLenH = sqrt(eyeOriLen2H - radius2);
float eyeToTangentCircleCosH = eyeToTangentCircleLenH / eyeOriLenH;
float eyeToTangentCircleSinH = radius / eyeOriLenH;
// rotate the eyeToOriDir (H & V) in both directions
glm::vec3 leftDir(eyeOriDirH.x * eyeToTangentCircleCosH + eyeOriDirH.z * eyeToTangentCircleSinH, 0.0f, eyeOriDirH.x * -eyeToTangentCircleSinH + eyeOriDirH.z * eyeToTangentCircleCosH);
glm::vec3 rightDir(eyeOriDirH.x * eyeToTangentCircleCosH - eyeOriDirH.z * eyeToTangentCircleSinH, 0.0f, eyeOriDirH.x * eyeToTangentCircleSinH + eyeOriDirH.z * eyeToTangentCircleCosH);
auto lc = theFrustumGrid.frustumGrid_eyeToClusterDirH(leftDir);
if (lc > xMax) {
lc = xMin;
}
auto rc = theFrustumGrid.frustumGrid_eyeToClusterDirH(rightDir);
if (rc < 0) {
rc = xMax;
}
xMin = std::max(xMin, lc);
xMax = std::min(rc, xMax);
assert(xMin <= xMax);
}
if ((eyeOriLen2V > radius2)) {
float eyeOriLenV = sqrt(eyeOriLen2V);
auto eyeOriDirV = glm::vec3(eyeOriV) / eyeOriLenV;
float eyeToTangentCircleLenV = sqrt(eyeOriLen2V - radius2);
float eyeToTangentCircleCosV = eyeToTangentCircleLenV / eyeOriLenV;
float eyeToTangentCircleSinV = radius / eyeOriLenV;
// rotate the eyeToOriDir (H & V) in both directions
glm::vec3 bottomDir(0.0f, eyeOriDirV.y * eyeToTangentCircleCosV + eyeOriDirV.z * eyeToTangentCircleSinV, eyeOriDirV.y * -eyeToTangentCircleSinV + eyeOriDirV.z * eyeToTangentCircleCosV);
glm::vec3 topDir(0.0f, eyeOriDirV.y * eyeToTangentCircleCosV - eyeOriDirV.z * eyeToTangentCircleSinV, eyeOriDirV.y * eyeToTangentCircleSinV + eyeOriDirV.z * eyeToTangentCircleCosV);
auto bc = theFrustumGrid.frustumGrid_eyeToClusterDirV(bottomDir);
auto tc = theFrustumGrid.frustumGrid_eyeToClusterDirV(topDir);
if (bc > yMax) {
bc = yMin;
}
if (tc < 0) {
tc = yMax;
}
yMin = std::max(yMin, bc);
yMax =std::min(tc, yMax);
assert(yMin <= yMax);
}
// now voxelize
auto& clusterGrid = (isSpot ? clusterGridSpot : clusterGridPoint);
if (beyondFar) {
numClusterTouched += scanLightVolumeBoxSlice(theFrustumGrid, _gridPlanes, zMin, yMin, yMax, xMin, xMax, lightId, glm::vec4(glm::vec3(eyeOri), radius), clusterGrid);
} else {
numClusterTouched += scanLightVolumeSphere(theFrustumGrid, _gridPlanes, zMin, zMax, yMin, yMax, xMin, xMax, lightId, glm::vec4(glm::vec3(eyeOri), radius), clusterGrid);
}
numClusteredLights++;
}
// Lights have been gathered now reexpress in terms of 2 sequential buffers
// Start filling from near to far and stops if it overflows
bool checkBudget = false;
if (numClusterTouched > maxNumIndices) {
checkBudget = true;
}
uint16_t indexOffset = 0;
for (int i = 0; i < (int) clusterGridPoint.size(); i++) {
auto& clusterPoint = clusterGridPoint[i];
auto& clusterSpot = clusterGridSpot[i];
uint8_t numLightsPoint = ((uint8_t)clusterPoint.size());
uint8_t numLightsSpot = ((uint8_t)clusterSpot.size());
uint16_t numLights = numLightsPoint + numLightsSpot;
uint16_t offset = indexOffset;
// Check for overflow
if (checkBudget) {
if ((indexOffset + numLights) > (uint16_t) maxNumIndices) {
break;
}
}
// Encode the cluster grid: [ ContentOffset - 16bits, Num Point LIghts - 8bits, Num Spot Lights - 8bits]
_clusterGrid[i] = (uint32_t)((0xFF000000 & (numLightsSpot << 24)) | (0x00FF0000 & (numLightsPoint << 16)) | (0x0000FFFF & offset));
if (numLightsPoint) {
memcpy(_clusterContent.data() + indexOffset, clusterPoint.data(), numLightsPoint * sizeof(LightIndex));
indexOffset += numLightsPoint;
}
if (numLightsSpot) {
memcpy(_clusterContent.data() + indexOffset, clusterSpot.data(), numLightsSpot * sizeof(LightIndex));
indexOffset += numLightsSpot;
}
}
// update the buffers
_clusterGridBuffer._buffer->setData(_clusterGridBuffer._size, (gpu::Byte*) _clusterGrid.data());
_clusterContentBuffer._buffer->setSubData(0, indexOffset * sizeof(LightIndex), (gpu::Byte*) _clusterContent.data());
return glm::ivec3(numLightsIn, numClusteredLights, numClusterTouched);
}
