void KRVector3::OrthoNormalize(KRVector3 &normal, KRVector3 &tangent) {
// Gram-Schmidt Orthonormalization
normal.normalize();
KRVector3 proj = normal * Dot(tangent, normal);
tangent = tangent - proj;
tangent.normalize();
}
bool _intersectSphere(const KRVector3 &start, const KRVector3 &dir, const KRVector3 &sphere_center, float sphere_radius, float &distance)
{
// dir must be normalized
// From: http://archive.gamedev.net/archive/reference/articles/article1026.html
// TODO - Move to another class?
KRVector3 Q = sphere_center - start;
float c = Q.magnitude();
float v = KRVector3::Dot(Q, dir);
float d = sphere_radius * sphere_radius - (c * c - v * v);
if(d < 0.0) {
// No intersection
return false;
}
// Return the distance to the [first] intersecting point
distance = v - sqrt(d);
if(distance < 0.0f) {
return false;
}
return true;
}
KRVector3 KRVector3::Slerp(const KRVector3 &v1, const KRVector3 &v2, float d) {
// From: http://keithmaggio.wordpress.com/2011/02/15/math-magician-lerp-slerp-and-nlerp/
// Dot product - the cosine of the angle between 2 vectors.
float dot = KRVector3::Dot(v1, v2);
// Clamp it to be in the range of Acos()
if(dot < -1.0f) dot = -1.0f;
if(dot > 1.0f) dot = 1.0f;
// Acos(dot) returns the angle between start and end,
// And multiplying that by percent returns the angle between
// start and the final result.
float theta = acos(dot)*d;
KRVector3 RelativeVec = v2 - v1*dot;
RelativeVec.normalize(); // Orthonormal basis
// The final result.
return ((v1*cos(theta)) + (RelativeVec*sin(theta)));
}
bool KRTriangle3::containsPoint(const KRVector3 &p) const
{
/*
// From: http://stackoverflow.com/questions/995445/determine-if-a-3d-point-is-within-a-triangle
const float SMALL_NUM = 0.00000001f; // anything that avoids division overflow
// KRVector3 A = m_c[0], B = m_c[1], C = m_c[2];
if (_sameSide(p, m_c[0], m_c[1], m_c[2]) && _sameSide(p, m_c[1], m_c[0], m_c[2]) && _sameSide(p, m_c[2], m_c[0], m_c[1])) {
KRVector3 vc1 = KRVector3::Cross(m_c[0] - m_c[1], m_c[0] - m_c[2]);
if(fabs(KRVector3::Dot(m_c[0] - p, vc1)) <= SMALL_NUM) {
return true;
}
}
return false;
*/
// From: http://blogs.msdn.com/b/rezanour/archive/2011/08/07/barycentric-coordinates-and-point-in-triangle-tests.aspx
KRVector3 A = m_c[0];
KRVector3 B = m_c[1];
KRVector3 C = m_c[2];
KRVector3 P = p;
// Prepare our barycentric variables
KRVector3 u = B - A;
KRVector3 v = C - A;
KRVector3 w = P - A;
KRVector3 vCrossW = KRVector3::Cross(v, w);
KRVector3 vCrossU = KRVector3::Cross(v, u);
// Test sign of r
if (KRVector3::Dot(vCrossW, vCrossU) < 0)
return false;
KRVector3 uCrossW = KRVector3::Cross(u, w);
KRVector3 uCrossV = KRVector3::Cross(u, v);
// Test sign of t
if (KRVector3::Dot(uCrossW, uCrossV) < 0)
return false;
// At this point, we know that r and t and both > 0.
// Therefore, as long as their sum is <= 1, each must be less <= 1
float denom = uCrossV.magnitude();
float r = vCrossW.magnitude() / denom;
float t = uCrossW.magnitude() / denom;
return (r + t <= 1);
}
bool KRShader::bind(KRCamera &camera, const KRViewport &viewport, const KRMat4 &matModel, const std::vector<KRPointLight *> &point_lights, const std::vector<KRDirectionalLight *> &directional_lights, const std::vector<KRSpotLight *>&spot_lights, const KRNode::RenderPass &renderPass, const KRVector3 &rim_color, float rim_power, const KRVector4 &fade_color) {
if(m_iProgram == 0) {
return false;
}
bool shander_changed = false;
if(getContext().getShaderManager()->m_active_shader != this) {
getContext().getShaderManager()->m_active_shader = this;
GLDEBUG(glUseProgram(m_iProgram));
shander_changed = true;
}
setUniform(KRENGINE_UNIFORM_ABSOLUTE_TIME, getContext().getAbsoluteTime());
int light_directional_count = 0;
int light_point_count = 0;
int light_spot_count = 0;
// TODO - Need to support multiple lights and more light types in forward rendering
if(renderPass != KRNode::RENDER_PASS_DEFERRED_LIGHTS && renderPass != KRNode::RENDER_PASS_DEFERRED_GBUFFER && renderPass != KRNode::RENDER_PASS_DEFERRED_OPAQUE && renderPass != KRNode::RENDER_PASS_GENERATE_SHADOWMAPS) {
for(std::vector<KRDirectionalLight *>::const_iterator light_itr=directional_lights.begin(); light_itr != directional_lights.end(); light_itr++) {
KRDirectionalLight *directional_light = (*light_itr);
if(light_directional_count == 0) {
int cShadowBuffers = directional_light->getShadowBufferCount();
if(m_uniforms[KRENGINE_UNIFORM_SHADOWTEXTURE1] != -1 && cShadowBuffers > 0) {
if(m_pContext->getTextureManager()->selectTexture(GL_TEXTURE_2D, 3, directional_light->getShadowTextures()[0])) {
GLDEBUG(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
GLDEBUG(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
}
m_pContext->getTextureManager()->_setWrapModeS(3, GL_CLAMP_TO_EDGE);
m_pContext->getTextureManager()->_setWrapModeT(3, GL_CLAMP_TO_EDGE);
}
if(m_uniforms[KRENGINE_UNIFORM_SHADOWTEXTURE2] != -1 && cShadowBuffers > 1 && camera.settings.m_cShadowBuffers > 1) {
if(m_pContext->getTextureManager()->selectTexture(GL_TEXTURE_2D, 4, directional_light->getShadowTextures()[1])) {
GLDEBUG(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
GLDEBUG(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
}
m_pContext->getTextureManager()->_setWrapModeS(4, GL_CLAMP_TO_EDGE);
m_pContext->getTextureManager()->_setWrapModeT(4, GL_CLAMP_TO_EDGE);
}
if(m_uniforms[KRENGINE_UNIFORM_SHADOWTEXTURE3] != -1 && cShadowBuffers > 2 && camera.settings.m_cShadowBuffers > 2) {
if(m_pContext->getTextureManager()->selectTexture(GL_TEXTURE_2D, 5, directional_light->getShadowTextures()[2])) {
GLDEBUG(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
GLDEBUG(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
}
m_pContext->getTextureManager()->_setWrapModeS(5, GL_CLAMP_TO_EDGE);
m_pContext->getTextureManager()->_setWrapModeT(5, GL_CLAMP_TO_EDGE);
}
KRMat4 matBias;
matBias.translate(1.0, 1.0, 1.0);
matBias.scale(0.5);
for(int iShadow=0; iShadow < cShadowBuffers; iShadow++) {
setUniform(KRENGINE_UNIFORM_SHADOWMVP1 + iShadow, matModel * directional_light->getShadowViewports()[iShadow].getViewProjectionMatrix() * matBias);
}
if(m_uniforms[KRENGINE_UNIFORM_LIGHT_DIRECTION_MODEL_SPACE] != -1) {
KRMat4 inverseModelMatrix = matModel;
inverseModelMatrix.invert();
// Bind the light direction vector
KRVector3 lightDirObject = KRMat4::Dot(inverseModelMatrix, directional_light->getWorldLightDirection());
lightDirObject.normalize();
setUniform(KRENGINE_UNIFORM_LIGHT_DIRECTION_MODEL_SPACE, lightDirObject);
}
}
light_directional_count++;
}
light_point_count = point_lights.size();
light_spot_count = spot_lights.size();
}
if(m_uniforms[KRENGINE_UNIFORM_CAMERAPOS_MODEL_SPACE] != -1) {
KRMat4 inverseModelMatrix = matModel;
inverseModelMatrix.invert();
if(m_uniforms[KRENGINE_UNIFORM_CAMERAPOS_MODEL_SPACE] != -1) {
// Transform location of camera to object space for calculation of specular halfVec
KRVector3 cameraPosObject = KRMat4::Dot(inverseModelMatrix, viewport.getCameraPosition());
setUniform(KRENGINE_UNIFORM_CAMERAPOS_MODEL_SPACE, cameraPosObject);
}
}
if(m_uniforms[KRENGINE_UNIFORM_MVP] != -1 || m_uniforms[KRShader::KRENGINE_UNIFORM_INVMVP] != -1) {
// Bind our modelmatrix variable to be a uniform called mvpmatrix in our shaderprogram
KRMat4 mvpMatrix = matModel * viewport.getViewProjectionMatrix();
setUniform(KRENGINE_UNIFORM_MVP, mvpMatrix);
if(m_uniforms[KRShader::KRENGINE_UNIFORM_INVMVP] != -1) {
setUniform(KRShader::KRENGINE_UNIFORM_INVMVP, KRMat4::Invert(mvpMatrix));
}
}
if(m_uniforms[KRShader::KRENGINE_UNIFORM_VIEW_SPACE_MODEL_ORIGIN] != -1 || m_uniforms[KRENGINE_UNIFORM_MODEL_VIEW_INVERSE_TRANSPOSE] != -1 || m_uniforms[KRShader::KRENGINE_UNIFORM_MODEL_VIEW] != -1) {
KRMat4 matModelView = matModel * viewport.getViewMatrix();
setUniform(KRENGINE_UNIFORM_MODEL_VIEW, matModelView);
if(m_uniforms[KRShader::KRENGINE_UNIFORM_VIEW_SPACE_MODEL_ORIGIN] != -1) {
KRVector3 view_space_model_origin = KRMat4::Dot(matModelView, KRVector3::Zero()); // Origin point of model space is the light source position. No perspective, so no w divide required
setUniform(KRENGINE_UNIFORM_VIEW_SPACE_MODEL_ORIGIN, view_space_model_origin);
}
if(m_uniforms[KRENGINE_UNIFORM_MODEL_VIEW_INVERSE_TRANSPOSE] != -1) {
KRMat4 matModelViewInverseTranspose = matModelView;
matModelViewInverseTranspose.transpose();
matModelViewInverseTranspose.invert();
setUniform(KRENGINE_UNIFORM_MODEL_VIEW_INVERSE_TRANSPOSE, matModelViewInverseTranspose);
}
}
if(m_uniforms[KRENGINE_UNIFORM_MODEL_INVERSE_TRANSPOSE] != -1) {
KRMat4 matModelInverseTranspose = matModel;
matModelInverseTranspose.transpose();
matModelInverseTranspose.invert();
setUniform(KRENGINE_UNIFORM_MODEL_INVERSE_TRANSPOSE, matModelInverseTranspose);
}
if(m_uniforms[KRShader::KRENGINE_UNIFORM_INVP] != -1) {
setUniform(KRENGINE_UNIFORM_INVP, viewport.getInverseProjectionMatrix());
}
if(m_uniforms[KRShader::KRENGINE_UNIFORM_INVMVP_NO_TRANSLATE] != -1) {
KRMat4 matInvMVPNoTranslate = matModel * viewport.getViewMatrix();;
// Remove the translation
matInvMVPNoTranslate.getPointer()[3] = 0;
matInvMVPNoTranslate.getPointer()[7] = 0;
matInvMVPNoTranslate.getPointer()[11] = 0;
matInvMVPNoTranslate.getPointer()[12] = 0;
matInvMVPNoTranslate.getPointer()[13] = 0;
matInvMVPNoTranslate.getPointer()[14] = 0;
matInvMVPNoTranslate.getPointer()[15] = 1.0;
matInvMVPNoTranslate = matInvMVPNoTranslate * viewport.getProjectionMatrix();
matInvMVPNoTranslate.invert();
setUniform(KRENGINE_UNIFORM_INVMVP_NO_TRANSLATE, matInvMVPNoTranslate);
}
setUniform(KRENGINE_UNIFORM_MODEL_MATRIX, matModel);
if(m_uniforms[KRENGINE_UNIFORM_PROJECTION_MATRIX] != -1) {
setUniform(KRENGINE_UNIFORM_PROJECTION_MATRIX, viewport.getProjectionMatrix());
}
if(m_uniforms[KRENGINE_UNIFORM_VIEWPORT] != -1) {
setUniform(KRENGINE_UNIFORM_VIEWPORT, KRVector4(
(GLfloat)0.0,
(GLfloat)0.0,
(GLfloat)viewport.getSize().x,
(GLfloat)viewport.getSize().y
)
);
}
if(m_uniforms[KRENGINE_UNIFORM_VIEWPORT_DOWNSAMPLE] != -1) {
setUniform(KRENGINE_UNIFORM_VIEWPORT_DOWNSAMPLE, camera.getDownsample());
}
// Rim highlighting parameters
setUniform(KRENGINE_UNIFORM_RIM_COLOR, rim_color);
setUniform(KRENGINE_UNIFORM_RIM_POWER, rim_power);
// Fade parameters
setUniform(KRENGINE_UNIFORM_FADE_COLOR, fade_color);
// Fog parameters
setUniform(KRENGINE_UNIFORM_FOG_NEAR, camera.settings.fog_near);
setUniform(KRENGINE_UNIFORM_FOG_FAR, camera.settings.fog_far);
setUniform(KRENGINE_UNIFORM_FOG_DENSITY, camera.settings.fog_density);
setUniform(KRENGINE_UNIFORM_FOG_COLOR, camera.settings.fog_color);
if(m_uniforms[KRENGINE_UNIFORM_FOG_SCALE] != -1) {
setUniform(KRENGINE_UNIFORM_FOG_SCALE, 1.0f / (camera.settings.fog_far - camera.settings.fog_near));
}
if(m_uniforms[KRENGINE_UNIFORM_DENSITY_PREMULTIPLIED_EXPONENTIAL] != -1) {
setUniform(KRENGINE_UNIFORM_DENSITY_PREMULTIPLIED_EXPONENTIAL, -camera.settings.fog_density * 1.442695f); // -fog_density / log(2)
}
if(m_uniforms[KRENGINE_UNIFORM_DENSITY_PREMULTIPLIED_SQUARED] != -1) {
setUniform(KRENGINE_UNIFORM_DENSITY_PREMULTIPLIED_SQUARED, (float)(-camera.settings.fog_density * camera.settings.fog_density * 1.442695)); // -fog_density * fog_density / log(2)
}
// Sets the diffuseTexture variable to the first texture unit
setUniform(KRENGINE_UNIFORM_DIFFUSETEXTURE, 0);
// Sets the specularTexture variable to the second texture unit
setUniform(KRENGINE_UNIFORM_SPECULARTEXTURE, 1);
// Sets the normalTexture variable to the third texture unit
setUniform(KRENGINE_UNIFORM_NORMALTEXTURE, 2);
// Sets the shadowTexture variable to the fourth texture unit
setUniform(KRENGINE_UNIFORM_SHADOWTEXTURE1, 3);
setUniform(KRENGINE_UNIFORM_SHADOWTEXTURE2, 4);
setUniform(KRENGINE_UNIFORM_SHADOWTEXTURE3, 5);
setUniform(KRENGINE_UNIFORM_REFLECTIONCUBETEXTURE, 4);
setUniform(KRENGINE_UNIFORM_LIGHTMAPTEXTURE, 5);
setUniform(KRENGINE_UNIFORM_GBUFFER_FRAME, 6);
setUniform(KRENGINE_UNIFORM_GBUFFER_DEPTH, 7); // Texture unit 7 is used for reading the depth buffer in gBuffer pass #2 and in post-processing pass
setUniform(KRENGINE_UNIFORM_REFLECTIONTEXTURE, 7); // Texture unit 7 is used for the reflection map textures in gBuffer pass #3 and when using forward rendering
setUniform(KRENGINE_UNIFORM_DEPTH_FRAME, 0);
setUniform(KRENGINE_UNIFORM_RENDER_FRAME, 1);
setUniform(KRENGINE_UNIFORM_VOLUMETRIC_ENVIRONMENT_FRAME, 2);
#if defined(DEBUG)
if(shander_changed) { // FINDME!! KIP!! HACK!!
GLint logLength;
GLint validate_status = GL_FALSE;
GLDEBUG(glValidateProgram(m_iProgram));
GLDEBUG(glGetProgramiv(m_iProgram, GL_VALIDATE_STATUS, &validate_status));
if(validate_status != GL_TRUE) {
KRContext::Log(KRContext::LOG_LEVEL_ERROR, "KREngine - Failed to validate shader program: %s", m_szKey);
GLDEBUG(glGetProgramiv(m_iProgram, GL_INFO_LOG_LENGTH, &logLength));
if (logLength > 0)
{
GLchar *log = (GLchar *)malloc(logLength + 1);
assert(log != NULL);
GLDEBUG(glGetProgramInfoLog(m_iProgram, logLength, &logLength, log));
log[logLength] = '\0';
KRContext::Log(KRContext::LOG_LEVEL_ERROR, "Program validate log:\n%s", log);
free(log);
}
return false;
}
}
#endif
return true;
}
