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Implemented dust particle system

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--HG--
extra : convert_revision : svn%3A7752d6cf-9f14-4ad2-affc-04f1e67b81a5/trunk%40164
This commit is contained in:
kearwood
2012-11-23 01:02:22 +00:00
parent 230dd4722d
commit 96a9c02a13
19 changed files with 165 additions and 39 deletions
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68
KREngine/KREngine/Classes/KRLight.cpp
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@@ -26,11 +26,15 @@
KRLight::KRLight(KRScene &scene, std::string name) : KRNode(scene, name)
{
m_intensity = 1.0f;
m_dust_particle_intensity = 1.0f;
m_color = KRVector3::One();
m_flareTexture = "";
m_pFlareTexture = NULL;
m_flareSize = 0.0;
m_casts_shadow = true;
m_light_shafts = true;
m_dust_particle_density = 0.1f;
m_dust_particle_size = 1.0f;
// Initialize shadow buffers
m_cShadowBuffers = 0;
@@ -58,12 +62,15 @@ tinyxml2::XMLElement *KRLight::saveXML( tinyxml2::XMLNode *parent)
e->SetAttribute("flare_texture", m_flareTexture.c_str());
e->SetAttribute("casts_shadow", m_casts_shadow ? "true" : "false");
e->SetAttribute("light_shafts", m_light_shafts ? "true" : "false");
e->SetAttribute("dust_particle_density", m_dust_particle_density);
e->SetAttribute("dust_particle_size", m_dust_particle_size);
e->SetAttribute("dust_particle_intensity", m_dust_particle_intensity);
return e;
}
void KRLight::loadXML(tinyxml2::XMLElement *e) {
KRNode::loadXML(e);
float x,y,z;
float x=1.0f,y=1.0f,z=1.0f;
if(e->QueryFloatAttribute("color_r", &x) != tinyxml2::XML_SUCCESS) {
x = 1.0;
}
@@ -95,6 +102,21 @@ void KRLight::loadXML(tinyxml2::XMLElement *e) {
m_light_shafts = true;
}
m_dust_particle_density = 0.1f;
if(e->QueryFloatAttribute("dust_particle_density", &m_dust_particle_density) != tinyxml2::XML_SUCCESS) {
m_dust_particle_density = 0.1f;
}
m_dust_particle_size = 1.0f;
if(e->QueryFloatAttribute("dust_particle_size", &m_dust_particle_size) != tinyxml2::XML_SUCCESS) {
m_dust_particle_size = 1.0f;
}
m_dust_particle_intensity = 1.0f;
if(e->QueryFloatAttribute("dust_particle_intensity", &m_dust_particle_intensity) != tinyxml2::XML_SUCCESS) {
m_dust_particle_intensity = 1.0f;
}
const char *szFlareTexture = e->Attribute("flare_texture");
if(szFlareTexture) {
m_flareTexture = szFlareTexture;
@@ -147,6 +169,46 @@ void KRLight::render(KRCamera *pCamera, std::vector<KRLight *> &lights, const KR
renderShadowBuffers(pCamera);
}
if(renderPass == KRNode::RENDER_PASS_ADDITIVE_PARTICLES) {
// Render brownian particles for dust floating in air
if(m_cShadowBuffers >= 1 && shadowValid[0] && m_dust_particle_density > 0.0f && m_dust_particle_size > 0.0f && m_dust_particle_intensity > 0.0f) {
float lod_coverage = getBounds().coverage(viewport.getViewProjectionMatrix(), viewport.getSize()); // This also checks the view frustrum culling
if(lod_coverage > 0.0f || true) {
float particle_range = 600.0f;
int particle_count = m_dust_particle_density * pow(particle_range, 3);
if(particle_count > KRModelManager::KRENGINE_MAX_RANDOM_PARTICLES) particle_count = KRModelManager::KRENGINE_MAX_RANDOM_PARTICLES;
// Enable z-buffer test
GLDEBUG(glEnable(GL_DEPTH_TEST));
GLDEBUG(glDepthRangef(0.0, 1.0));
KRMat4 particleModelMatrix;
particleModelMatrix.scale(particle_range); // Scale the box symetrically to ensure that we don't have an uneven distribution of particles for different angles of the view frustrum
particleModelMatrix.translate(viewport.getCameraPosition());
std::vector<KRLight *> this_light;
this_light.push_back(this);
KRShader *pParticleShader = m_pContext->getShaderManager()->getShader("particle", pCamera, this_light, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, renderPass);
if(getContext().getShaderManager()->selectShader(*pCamera, pParticleShader, viewport, particleModelMatrix, this_light, renderPass)) {
(m_color * pCamera->dust_particle_intensity * m_dust_particle_intensity * m_intensity).setUniform(pParticleShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_COLOR]);
KRMat4::DotWDiv(KRMat4::Invert(particleModelMatrix), KRVector3::Zero()).setUniform(pParticleShader->m_uniforms[KRShader::KRENGINE_UNIFORM_PARTICLE_ORIGIN]);
GLDEBUG(glUniform1f(pParticleShader->m_uniforms[KRShader::KRENGINE_UNIFORM_FLARE_SIZE], m_dust_particle_size));
m_pContext->getModelManager()->bindVBO((void *)m_pContext->getModelManager()->getRandomParticles(), KRModelManager::KRENGINE_MAX_RANDOM_PARTICLES * 3 * sizeof(KRModelManager::RandomParticleVertexData), true, false, false, true, false);
GLDEBUG(glDrawArrays(GL_TRIANGLES, 0, particle_count*3));
}
}
}
}
if(renderPass == KRNode::RENDER_PASS_VOLUMETRIC_EFFECTS_ADDITIVE && pCamera->volumetric_environment_enable && m_light_shafts) {
std::string shader_name = pCamera->volumetric_environment_downsample != 0 ? "volumetric_fog_downsampled" : "volumetric_fog";
@@ -164,9 +226,9 @@ void KRLight::render(KRCamera *pCamera, std::vector<KRLight *> &lights, const KR
float slice_spacing = (slice_far - slice_near) / slice_count;
KRVector2(slice_near, slice_spacing).setUniform(pFogShader->m_uniforms[KRShader::KRENGINE_UNIFORM_SLICE_DEPTH_SCALE]);
(KRVector3::One() * pCamera->volumetric_environment_intensity * -slice_spacing / 1000.0f).setUniform(pFogShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_COLOR]);
(m_color * pCamera->volumetric_environment_intensity * m_intensity * -slice_spacing / 1000.0f).setUniform(pFogShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_COLOR]);
m_pContext->getModelManager()->bindVBO((void *)m_pContext->getModelManager()->getVolumetricLightingVertexes(), KRModelManager::MAX_VOLUMETRIC_PLANES * 6 * sizeof(KRModelManager::VolumetricLightingVertexData), true, false, false, false, false);
m_pContext->getModelManager()->bindVBO((void *)m_pContext->getModelManager()->getVolumetricLightingVertexes(), KRModelManager::KRENGINE_MAX_VOLUMETRIC_PLANES * 6 * sizeof(KRModelManager::VolumetricLightingVertexData), true, false, false, false, false);
GLDEBUG(glDrawArrays(GL_TRIANGLES, 0, slice_count*6));
}