Kearwood Gilbert
d282294594
Re-normalized the min and max distance related parameters in KREngine.mm
241 lines
8.9 KiB
C++
241 lines
8.9 KiB
C++
//
|
|
// KRPointLight.cpp
|
|
// KREngine
|
|
//
|
|
// Created by Kearwood Gilbert on 12-04-05.
|
|
// Copyright (c) 2012 Kearwood Software. All rights reserved.
|
|
//
|
|
|
|
#include "KREngine-common.h"
|
|
|
|
#include "KRPointLight.h"
|
|
#include "KRMat4.h"
|
|
#include "KRVector3.h"
|
|
#include "KRCamera.h"
|
|
#include "KRContext.h"
|
|
#include "KRStockGeometry.h"
|
|
|
|
KRPointLight::KRPointLight(KRScene &scene, std::string name) : KRLight(scene, name)
|
|
{
|
|
m_sphereVertices = NULL;
|
|
m_cVertices = 0;
|
|
}
|
|
|
|
KRPointLight::~KRPointLight()
|
|
{
|
|
if(m_sphereVertices) {
|
|
delete m_sphereVertices;
|
|
m_cVertices = 0;
|
|
}
|
|
}
|
|
|
|
std::string KRPointLight::getElementName() {
|
|
return "point_light";
|
|
}
|
|
|
|
KRAABB KRPointLight::getBounds() {
|
|
float influence_radius = sqrt((m_intensity / 100.0) / KRLIGHT_MIN_INFLUENCE - 1.0) + m_decayStart;
|
|
return KRAABB(KRVector3(-influence_radius), KRVector3(influence_radius), getModelMatrix());
|
|
}
|
|
|
|
void KRPointLight::render(KRCamera *pCamera, std::vector<KRLight *> &lights, const KRViewport &viewport, KRNode::RenderPass renderPass)
|
|
{
|
|
|
|
KRLight::render(pCamera, lights, viewport, renderPass);
|
|
|
|
bool bVisualize = renderPass == KRNode::RENDER_PASS_FORWARD_TRANSPARENT && pCamera->settings.bShowDeferred;
|
|
|
|
if(renderPass == KRNode::RENDER_PASS_DEFERRED_LIGHTS || bVisualize) {
|
|
// Lights are rendered on the second pass of the deferred renderer
|
|
|
|
std::vector<KRLight *> this_light;
|
|
this_light.push_back(this);
|
|
|
|
KRVector3 light_position = getLocalTranslation();
|
|
|
|
float influence_radius = sqrt((m_intensity / 100.0) / KRLIGHT_MIN_INFLUENCE - 1.0) + m_decayStart;
|
|
|
|
KRMat4 sphereModelMatrix = KRMat4();
|
|
sphereModelMatrix.scale(influence_radius);
|
|
sphereModelMatrix.translate(light_position.x, light_position.y, light_position.z);
|
|
|
|
|
|
float lod_coverage = getBounds().coverage(viewport.getViewProjectionMatrix(), viewport.getSize()); // This also checks the view frustrum culling
|
|
if(lod_coverage > 0) { // Cull out any lights not within the view frustrum
|
|
|
|
KRVector3 view_light_position = KRMat4::Dot(viewport.getViewMatrix(), light_position);
|
|
|
|
bool bInsideLight = view_light_position.sqrMagnitude() <= (influence_radius + pCamera->settings.getPerspectiveNearZ()) * (influence_radius + pCamera->settings.getPerspectiveNearZ());
|
|
|
|
KRShader *pShader = getContext().getShaderManager()->getShader(bVisualize ? "visualize_overlay" : (bInsideLight ? "light_point_inside" : "light_point"), pCamera, this_light, 0, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, renderPass);
|
|
|
|
if(getContext().getShaderManager()->selectShader(*pCamera, pShader, viewport, sphereModelMatrix, this_light, 0, renderPass)) {
|
|
|
|
|
|
|
|
m_color.setUniform(pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_COLOR]);
|
|
|
|
GLDEBUG(glUniform1f(
|
|
pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_INTENSITY],
|
|
m_intensity / 100.0f
|
|
));
|
|
|
|
GLDEBUG(glUniform1f(
|
|
pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_DECAY_START],
|
|
getDecayStart()
|
|
));
|
|
|
|
GLDEBUG(glUniform1f(
|
|
pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_CUTOFF],
|
|
KRLIGHT_MIN_INFLUENCE
|
|
));
|
|
|
|
light_position.setUniform(pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_POSITION]);
|
|
|
|
if(bVisualize) {
|
|
// Enable additive blending
|
|
GLDEBUG(glEnable(GL_BLEND));
|
|
GLDEBUG(glBlendFunc(GL_ONE, GL_ONE));
|
|
}
|
|
|
|
// Disable z-buffer write
|
|
GLDEBUG(glDepthMask(GL_FALSE));
|
|
|
|
|
|
if(bInsideLight) {
|
|
|
|
// Disable z-buffer test
|
|
GLDEBUG(glDisable(GL_DEPTH_TEST));
|
|
|
|
// Render a full screen quad
|
|
m_pContext->getModelManager()->bindVBO((void *)KRENGINE_VBO_2D_SQUARE, KRENGINE_VBO_2D_SQUARE_SIZE, NULL, 0, true, false, false, true, false, false, false);
|
|
GLDEBUG(glDrawArrays(GL_TRIANGLE_STRIP, 0, 4));
|
|
} else {
|
|
#if GL_OES_vertex_array_object
|
|
GLDEBUG(glBindVertexArrayOES(0));
|
|
#endif
|
|
m_pContext->getModelManager()->configureAttribs(true, false, false, false, false, false, false);
|
|
// Render sphere of light's influence
|
|
generateMesh();
|
|
|
|
// Enable z-buffer test
|
|
GLDEBUG(glEnable(GL_DEPTH_TEST));
|
|
GLDEBUG(glDepthFunc(GL_LEQUAL));
|
|
GLDEBUG(glDepthRangef(0.0, 1.0));
|
|
|
|
GLDEBUG(glVertexAttribPointer(KRMesh::KRENGINE_ATTRIB_VERTEX, 3, GL_FLOAT, 0, 0, m_sphereVertices));
|
|
GLDEBUG(glDrawArrays(GL_TRIANGLES, 0, m_cVertices));
|
|
}
|
|
}
|
|
if(bVisualize) {
|
|
// Enable alpha blending
|
|
GLDEBUG(glEnable(GL_BLEND));
|
|
GLDEBUG(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void KRPointLight::generateMesh() {
|
|
// Create a triangular facet approximation to a sphere
|
|
// Based on algorithm from Paul Bourke: http://paulbourke.net/miscellaneous/sphere_cylinder/
|
|
|
|
int iterations = 3;
|
|
int facet_count = pow(4, iterations) * 8;
|
|
|
|
if(m_cVertices != facet_count * 3) {
|
|
if(m_sphereVertices) {
|
|
free(m_sphereVertices);
|
|
m_sphereVertices = NULL;
|
|
}
|
|
|
|
m_cVertices = facet_count * 3;
|
|
|
|
|
|
class Facet3 {
|
|
public:
|
|
Facet3() {
|
|
|
|
}
|
|
~Facet3() {
|
|
|
|
}
|
|
KRVector3 p1;
|
|
KRVector3 p2;
|
|
KRVector3 p3;
|
|
};
|
|
|
|
std::vector<Facet3> f = std::vector<Facet3>(facet_count);
|
|
|
|
int i,it;
|
|
float a;
|
|
KRVector3 p[6] = {
|
|
KRVector3(0,0,1),
|
|
KRVector3(0,0,-1),
|
|
KRVector3(-1,-1,0),
|
|
KRVector3(1,-1,0),
|
|
KRVector3(1,1,0),
|
|
KRVector3(-1,1,0)
|
|
};
|
|
|
|
KRVector3 pa,pb,pc;
|
|
int nt = 0,ntold;
|
|
|
|
/* Create the level 0 object */
|
|
a = 1 / sqrt(2.0);
|
|
for (i=0;i<6;i++) {
|
|
p[i].x *= a;
|
|
p[i].y *= a;
|
|
}
|
|
f[0].p1 = p[0]; f[0].p2 = p[3]; f[0].p3 = p[4];
|
|
f[1].p1 = p[0]; f[1].p2 = p[4]; f[1].p3 = p[5];
|
|
f[2].p1 = p[0]; f[2].p2 = p[5]; f[2].p3 = p[2];
|
|
f[3].p1 = p[0]; f[3].p2 = p[2]; f[3].p3 = p[3];
|
|
f[4].p1 = p[1]; f[4].p2 = p[4]; f[4].p3 = p[3];
|
|
f[5].p1 = p[1]; f[5].p2 = p[5]; f[5].p3 = p[4];
|
|
f[6].p1 = p[1]; f[6].p2 = p[2]; f[6].p3 = p[5];
|
|
f[7].p1 = p[1]; f[7].p2 = p[3]; f[7].p3 = p[2];
|
|
nt = 8;
|
|
|
|
/* Bisect each edge and move to the surface of a unit sphere */
|
|
for (it=0;it<iterations;it++) {
|
|
ntold = nt;
|
|
for (i=0;i<ntold;i++) {
|
|
pa.x = (f[i].p1.x + f[i].p2.x) / 2;
|
|
pa.y = (f[i].p1.y + f[i].p2.y) / 2;
|
|
pa.z = (f[i].p1.z + f[i].p2.z) / 2;
|
|
pb.x = (f[i].p2.x + f[i].p3.x) / 2;
|
|
pb.y = (f[i].p2.y + f[i].p3.y) / 2;
|
|
pb.z = (f[i].p2.z + f[i].p3.z) / 2;
|
|
pc.x = (f[i].p3.x + f[i].p1.x) / 2;
|
|
pc.y = (f[i].p3.y + f[i].p1.y) / 2;
|
|
pc.z = (f[i].p3.z + f[i].p1.z) / 2;
|
|
pa.normalize();
|
|
pb.normalize();
|
|
pc.normalize();
|
|
f[nt].p1 = f[i].p1; f[nt].p2 = pa; f[nt].p3 = pc; nt++;
|
|
f[nt].p1 = pa; f[nt].p2 = f[i].p2; f[nt].p3 = pb; nt++;
|
|
f[nt].p1 = pb; f[nt].p2 = f[i].p3; f[nt].p3 = pc; nt++;
|
|
f[i].p1 = pa;
|
|
f[i].p2 = pb;
|
|
f[i].p3 = pc;
|
|
}
|
|
}
|
|
|
|
m_sphereVertices = (GLfloat *)malloc(sizeof(GLfloat) * m_cVertices * 3);
|
|
assert(m_sphereVertices != NULL);
|
|
GLfloat *pDest = m_sphereVertices;
|
|
for(int facet_index=0; facet_index < facet_count; facet_index++) {
|
|
*pDest++ = f[facet_index].p1.x;
|
|
*pDest++ = f[facet_index].p1.y;
|
|
*pDest++ = f[facet_index].p1.z;
|
|
*pDest++ = f[facet_index].p2.x;
|
|
*pDest++ = f[facet_index].p2.y;
|
|
*pDest++ = f[facet_index].p2.z;
|
|
*pDest++ = f[facet_index].p3.x;
|
|
*pDest++ = f[facet_index].p3.y;
|
|
*pDest++ = f[facet_index].p3.z;
|
|
}
|
|
}
|
|
}
|