269 lines
10 KiB
C++
269 lines
10 KiB
C++
//
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// KRPointLight.cpp
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// KREngine
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//
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// Created by Kearwood Gilbert on 12-04-05.
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// Copyright (c) 2012 Kearwood Software. All rights reserved.
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//
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#include <iostream>
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#import "KRPointLight.h"
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#import "KRMat4.h"
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#import "KRVector3.h"
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#import "KRCamera.h"
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#import "KRContext.h"
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#import "KRBoundingVolume.h"
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KRPointLight::KRPointLight(std::string name) : KRLight(name)
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{
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m_sphereVertices = NULL;
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m_cVertices = 0;
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}
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KRPointLight::~KRPointLight()
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{
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if(m_sphereVertices) {
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delete m_sphereVertices;
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m_cVertices = 0;
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}
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}
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std::string KRPointLight::getElementName() {
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return "point_light";
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}
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#if TARGET_OS_IPHONE
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void KRPointLight::render(KRCamera *pCamera, KRContext *pContext, KRBoundingVolume &frustrumVolume, bool bRenderShadowMap, KRMat4 &viewMatrix, KRVector3 &cameraPosition, KRVector3 &lightDirection, KRMat4 *pShadowMatrices, GLuint *shadowDepthTextures, int cShadowBuffers, int gBufferPass) {
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if(gBufferPass == 2) {
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// Lights are rendered on the second pass of the deferred renderer
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KRMat4 projectionMatrix = pCamera->getProjectionMatrix();
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KRVector3 light_position = getLocalTranslation();
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float influence_radius = sqrt((m_intensity / 100.0) / KRLIGHT_MIN_INFLUENCE - 1.0) + m_decayStart;
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m_modelMatrix = KRMat4();
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m_modelMatrix.scale(influence_radius);
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m_modelMatrix.translate(light_position.x, light_position.y, light_position.z);
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KRMat4 mvpmatrix = m_modelMatrix * viewMatrix * projectionMatrix;
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KRMat4 matModelToView = viewMatrix * m_modelMatrix;
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matModelToView.transpose();
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matModelToView.invert();
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KRMat4 matModelToView2 = KRMat4() * m_modelMatrix * viewMatrix;
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KRMat4 matViewToModel = m_modelMatrix * viewMatrix;
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matViewToModel.invert();
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KRVector3 view_space_light_position = matModelToView2.dot(KRVector3(0.0)); // Origin point of model space is the light source position. No perspective, so no w divide required
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KRBoundingVolume influence_extents = KRBoundingVolume(KRVector3(-1.0), KRVector3(1.0), m_modelMatrix);
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KRBoundingVolume frustrumVolumeNoNearClip = KRBoundingVolume(viewMatrix, pCamera->perspective_fov, pCamera->m_viewportSize.x / pCamera->m_viewportSize.y, 0.0, pCamera->perspective_farz);
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if(influence_extents.test_intersect(frustrumVolumeNoNearClip)) {
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// Cull out any lights not within the view frustrum
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KRShader *pShader = pContext->getShaderManager()->getShader("light_point", pCamera, false, false, false, 0, false, false, false, false, false, false, false, gBufferPass);
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pShader->bind(pCamera, matModelToView, mvpmatrix, cameraPosition, lightDirection, pShadowMatrices, shadowDepthTextures, 0, gBufferPass);
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glUniform3f(
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pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_COLOR],
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m_color.x,
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m_color.y,
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m_color.z
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);
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glUniform1f(
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pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_INTENSITY],
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m_intensity / 100.0f
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);
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glUniform1f(
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pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_DECAY_START],
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getDecayStart()
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);
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glUniform1f(
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pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_CUTOFF],
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KRLIGHT_MIN_INFLUENCE
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);
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glUniform3f(
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pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_POSITION],
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light_position.x,
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light_position.y,
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light_position.z
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);
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glUniform3f(
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pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_LIGHT_POSITION_VIEW_SPACE],
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view_space_light_position.x,
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view_space_light_position.y,
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view_space_light_position.z
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);
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glUniformMatrix4fv(pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_V2M], 1, GL_FALSE, matViewToModel.getPointer());
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glUniformMatrix4fv(pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_M2V], 1, GL_FALSE, matModelToView2.getPointer());
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KRMat4 matInvProjection;
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matInvProjection = pCamera->getProjectionMatrix();
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matInvProjection.invert();
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glUniformMatrix4fv(pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_INVP], 1, GL_FALSE, matInvProjection.getPointer());
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// Disable z-buffer write
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glDepthMask(GL_FALSE);
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//if(view_space_light_position.GetMagnitude() > influence_radius) {
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// Render sphere of light's influence
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generateMesh();
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// Enable z-buffer test
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_LEQUAL);
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glDepthRangef(0.0, 1.0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glVertexAttribPointer(KRShader::KRENGINE_ATTRIB_VERTEX, 3, GL_FLOAT, 0, 0, m_sphereVertices);
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glEnableVertexAttribArray(KRShader::KRENGINE_ATTRIB_VERTEX);
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glDrawArrays(GL_TRIANGLES, 0, m_cVertices);
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/*
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} else {
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// Sphere would be clipped against view frustrum. Fall back to a full screen quad
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// Disable z-buffer test
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glDisable(GL_DEPTH_TEST);
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// Render a full screen quad
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static const GLfloat squareVertices[] = {
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-1.0f, -1.0f, 0.0f,
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1.0f, -1.0f, 0.0f,
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-1.0f, 1.0f, 0.0f,
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1.0f, 1.0f, 0.0f,
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};
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KRMat4 matIdentity;
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glUniformMatrix4fv(pShader->m_uniforms[KRShader::KRENGINE_UNIFORM_MVP], 1, GL_FALSE, matIdentity.getPointer());
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glVertexAttribPointer(KRShader::KRENGINE_ATTRIB_VERTEX, 3, GL_FLOAT, 0, 0, squareVertices);
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glEnableVertexAttribArray(KRShader::KRENGINE_ATTRIB_VERTEX);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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}
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*/
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}
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}
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KRNode::render(pCamera, pContext, frustrumVolume, bRenderShadowMap, viewMatrix, cameraPosition, lightDirection, pShadowMatrices, shadowDepthTextures, cShadowBuffers, gBufferPass);
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}
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void KRPointLight::generateMesh() {
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// Create a triangular facet approximation to a sphere
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// Based on algorithm from Paul Bourke: http://paulbourke.net/miscellaneous/sphere_cylinder/
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int iterations = 3;
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int facet_count = pow(4, iterations) * 8;
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if(m_cVertices != facet_count * 3) {
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if(m_sphereVertices) {
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free(m_sphereVertices);
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m_sphereVertices = NULL;
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}
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m_cVertices = facet_count * 3;
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class Facet3 {
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public:
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Facet3() {
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}
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~Facet3() {
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}
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KRVector3 p1;
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KRVector3 p2;
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KRVector3 p3;
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};
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std::vector<Facet3> f = std::vector<Facet3>(facet_count);
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int i,it;
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double a;
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KRVector3 p[6] = {
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KRVector3(0,0,1),
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KRVector3(0,0,-1),
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KRVector3(-1,-1,0),
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KRVector3(1,-1,0),
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KRVector3(1,1,0),
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KRVector3(-1,1,0)
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};
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KRVector3 pa,pb,pc;
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int nt = 0,ntold;
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/* Create the level 0 object */
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a = 1 / sqrt(2.0);
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for (i=0;i<6;i++) {
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p[i].x *= a;
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p[i].y *= a;
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}
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f[0].p1 = p[0]; f[0].p2 = p[3]; f[0].p3 = p[4];
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f[1].p1 = p[0]; f[1].p2 = p[4]; f[1].p3 = p[5];
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f[2].p1 = p[0]; f[2].p2 = p[5]; f[2].p3 = p[2];
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f[3].p1 = p[0]; f[3].p2 = p[2]; f[3].p3 = p[3];
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f[4].p1 = p[1]; f[4].p2 = p[4]; f[4].p3 = p[3];
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f[5].p1 = p[1]; f[5].p2 = p[5]; f[5].p3 = p[4];
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f[6].p1 = p[1]; f[6].p2 = p[2]; f[6].p3 = p[5];
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f[7].p1 = p[1]; f[7].p2 = p[3]; f[7].p3 = p[2];
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nt = 8;
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/* Bisect each edge and move to the surface of a unit sphere */
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for (it=0;it<iterations;it++) {
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ntold = nt;
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for (i=0;i<ntold;i++) {
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pa.x = (f[i].p1.x + f[i].p2.x) / 2;
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pa.y = (f[i].p1.y + f[i].p2.y) / 2;
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pa.z = (f[i].p1.z + f[i].p2.z) / 2;
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pb.x = (f[i].p2.x + f[i].p3.x) / 2;
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pb.y = (f[i].p2.y + f[i].p3.y) / 2;
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pb.z = (f[i].p2.z + f[i].p3.z) / 2;
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pc.x = (f[i].p3.x + f[i].p1.x) / 2;
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pc.y = (f[i].p3.y + f[i].p1.y) / 2;
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pc.z = (f[i].p3.z + f[i].p1.z) / 2;
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pa.normalize();
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pb.normalize();
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pc.normalize();
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f[nt].p1 = f[i].p1; f[nt].p2 = pa; f[nt].p3 = pc; nt++;
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f[nt].p1 = pa; f[nt].p2 = f[i].p2; f[nt].p3 = pb; nt++;
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f[nt].p1 = pb; f[nt].p2 = f[i].p3; f[nt].p3 = pc; nt++;
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f[i].p1 = pa;
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f[i].p2 = pb;
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f[i].p3 = pc;
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}
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}
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m_sphereVertices = (GLfloat *)malloc(sizeof(GLfloat) * m_cVertices * 3);
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GLfloat *pDest = m_sphereVertices;
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for(int facet_index=0; facet_index < facet_count; facet_index++) {
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*pDest++ = f[facet_index].p1.x;
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*pDest++ = f[facet_index].p1.y;
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*pDest++ = f[facet_index].p1.z;
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*pDest++ = f[facet_index].p2.x;
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*pDest++ = f[facet_index].p2.y;
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*pDest++ = f[facet_index].p2.z;
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*pDest++ = f[facet_index].p3.x;
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*pDest++ = f[facet_index].p3.y;
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*pDest++ = f[facet_index].p3.z;
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}
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}
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}
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#endif |