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Specular calculations for deferred lighting in progress

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Have integrated the position of the directional light in the scene graph (imported from fbx) with the forward renderer and deferred lighting renderer's directional light angle

--HG--
extra : convert_revision : svn%3A7752d6cf-9f14-4ad2-affc-04f1e67b81a5/trunk%4048
This commit is contained in:
kearwood
2012-04-19 23:39:32 +00:00
parent 2ead2995d5
commit 21762174bf
14 changed files with 148 additions and 17 deletions
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11
KREngine/KREngine/Classes/KRCamera.cpp
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@@ -31,6 +31,7 @@
#include <iostream>
#import "KRVector2.h"
#import "KRCamera.h"
KRCamera::KRCamera() {
@@ -47,7 +48,7 @@ KRCamera::KRCamera() {
bEnableSpecular = true;
bEnableLightMap = true;
bDebugSuperShiny = false;
bEnableDeferredLighting = false;
bEnableDeferredLighting = true;
dAmbientR = 0.25f;
@@ -88,4 +89,12 @@ KRMat4 KRCamera::getProjectionMatrix() {
projectionMatrix.perspective(perspective_fov, perspective_aspect, perspective_nearz, perspective_farz);
projectionMatrix.rotate(-90 * 0.0174532925199, Z_AXIS);
return projectionMatrix;
}
const KRVector2 &KRCamera::getViewportSize() {
return m_viewportSize;
}
void KRCamera::setViewportSize(const KRVector2 &size) {
m_viewportSize = size;
}

5
KREngine/KREngine/Classes/KRCamera.h
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@@ -35,6 +35,7 @@
#import "KREngine-common.h"
#import "KRMat4.h"
#import "KRVector2.h"
class KRCamera {
public:
@@ -42,6 +43,8 @@ public:
~KRCamera();
KRMat4 getProjectionMatrix();
const KRVector2 &getViewportSize();
void setViewportSize(const KRVector2 &size);
bool bEnablePerPixel;
bool bEnableDiffuseMap;
@@ -77,6 +80,8 @@ public:
bool bEnableVignette;
double vignette_radius;
double vignette_falloff;
KRVector2 m_viewportSize;
};
#endif

17
KREngine/KREngine/Classes/KRDirectionalLight.cpp
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@@ -11,6 +11,7 @@
#import "KRDirectionalLight.h"
#import "KRShader.h"
#import "KRContext.h"
#import "KRMat4.h"
KRDirectionalLight::KRDirectionalLight(std::string name) : KRLight(name)
{
@@ -26,6 +27,17 @@ std::string KRDirectionalLight::getElementName() {
return "directional_light";
}
KRVector3 KRDirectionalLight::getLightDirection() {
KRVector3 world_rotation = getWorldRotation();
KRVector3 light_rotation = KRVector3(0.0, -1.0, 0.0);
KRMat4 m;
m.rotate(world_rotation.x, X_AXIS);
m.rotate(world_rotation.y, Y_AXIS);
m.rotate(world_rotation.z, Z_AXIS);
KRVector3 light_direction = m.dot(light_rotation);
return light_direction;
}
#if TARGET_OS_IPHONE
void KRDirectionalLight::render(KRCamera *pCamera, KRContext *pContext, KRBoundingVolume &frustrumVolume, bool bRenderShadowMap, KRMat4 &viewMatrix, KRVector3 &cameraPosition, KRVector3 &lightDirection, KRMat4 *pShadowMatrices, GLuint *shadowDepthTextures, int cShadowBuffers, int gBufferPass) {
@@ -40,9 +52,12 @@ void KRDirectionalLight::render(KRCamera *pCamera, KRContext *pContext, KRBoundi
matModelToView.transpose();
matModelToView.invert();
KRVector3 light_direction = getLightDirection();
light_direction = matModelToView.dot(light_direction);
light_direction.normalize();
KRShader *pShader = pContext->getShaderManager()->getShader("light_directional", pCamera, false, false, false, 0, false, false, false, false, false, false, false, gBufferPass);
pShader->bind(pCamera, matModelToView, mvpmatrix, cameraPosition, lightDirection, pShadowMatrices, shadowDepthTextures, 0, gBufferPass);
pShader->bind(pCamera, matModelToView, mvpmatrix, cameraPosition, light_direction, pShadowMatrices, shadowDepthTextures, 0, gBufferPass);
// Render a full screen quad

1
KREngine/KREngine/Classes/KRDirectionalLight.h
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@@ -19,6 +19,7 @@ public:
virtual ~KRDirectionalLight();
virtual std::string getElementName();
KRVector3 getLightDirection();
#if TARGET_OS_IPHONE

1
KREngine/KREngine/Classes/KREngine.h
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@@ -72,6 +72,7 @@ typedef enum KREngineParameterType {KRENGINE_PARAMETER_INT, KRENGINE_PARAMETER_F
KRENGINE_UNIFORM_SHADOWMVP3,
KRENGINE_UNIFORM_LIGHTDIRECTION,
KRENGINE_UNIFORM_CAMERAPOS,
KRENGINE_UNIFORM_VIEWPORT,
KRENGINE_NUM_UNIFORMS
};
GLint m_shadowUniforms[KRENGINE_NUM_UNIFORMS];

4
KREngine/KREngine/Classes/KREngine.mm
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@@ -350,12 +350,12 @@ double const PI = 3.141592653589793f;
KRVector3 lightDirection;
KRBoundingVolume shadowVolume = KRBoundingVolume(vertices);
pScene->render(&m_camera, m_pContext, shadowVolume, true, shadowmvpmatrix[iShadow], cameraPosition, lightDirection, shadowmvpmatrix, NULL, m_cShadowBuffers, 0);
glViewport(0, 0, 768, 1024);
glViewport(0, 0, backingWidth, backingHeight);
}
- (void)renderScene: (KRScene *)pScene WithViewMatrix: (KRMat4)viewMatrix LightDirection: (KRVector3)lightDirection CameraPosition: (KRVector3)cameraPosition
{
m_camera.setViewportSize(KRVector2(backingWidth, backingHeight));

14
KREngine/KREngine/Classes/KRNode.cpp
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@@ -112,6 +112,16 @@ const KRVector3 &KRNode::getLocalRotation() {
return m_localRotation;
}
const KRVector3 &KRNode::getWorldTranslation() {
return m_localTranslation;
}
const KRVector3 &KRNode::getWorldScale() {
return m_localScale;
}
const KRVector3 &KRNode::getWorldRotation() {
return m_localRotation;
}
std::string KRNode::getElementName() {
return "node";
}
@@ -180,3 +190,7 @@ void KRNode::calcExtents(KRContext *pContext) {
}
}
}
const std::vector<KRNode *> &KRNode::getChildren() {
return m_childNodes;
}

5
KREngine/KREngine/Classes/KRNode.h
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@@ -34,6 +34,7 @@ public:
virtual std::string getElementName();
void addChild(KRNode *child);
const std::vector<KRNode *> &getChildren();
void setLocalTranslation(const KRVector3 &v);
void setLocalScale(const KRVector3 &v);
@@ -43,6 +44,10 @@ public:
const KRVector3 &getLocalScale();
const KRVector3 &getLocalRotation();
const KRVector3 &getWorldTranslation();
const KRVector3 &getWorldScale();
const KRVector3 &getWorldRotation();
void clearExtents();
virtual void calcExtents(KRContext *Context);
KRBoundingVolume getExtents(KRContext *pContext);

37
KREngine/KREngine/Classes/KRScene.cpp
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@@ -35,10 +35,12 @@
#import "KRMat4.h"
#import "tinyxml2.h"
#import "KRDirectionalLight.h"
#import "KRScene.h"
KRScene::KRScene(std::string name) : KRResource(name) {
m_pFirstDirectionalLight = NULL;
m_pRootNode = new KRNode("scene_root");
}
KRScene::~KRScene() {
@@ -77,7 +79,13 @@ void KRScene::render(KRCamera *pCamera, KRContext *pContext, KRBoundingVolume &f
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
m_pRootNode->render(pCamera, pContext, frustrumVolume, bRenderShadowMap, viewMatrix, cameraPosition, lightDirection, pShadowMatrices, shadowDepthTextures, cShadowBuffers, gBufferPass);
KRVector3 forward_render_light_direction = lightDirection;
KRDirectionalLight *directional_light = getFirstDirectionalLight();
if(directional_light) {
forward_render_light_direction = directional_light->getLightDirection();
}
m_pRootNode->render(pCamera, pContext, frustrumVolume, bRenderShadowMap, viewMatrix, cameraPosition, forward_render_light_direction, pShadowMatrices, shadowDepthTextures, cShadowBuffers, gBufferPass);
}
#endif
@@ -104,6 +112,22 @@ bool KRScene::save(const std::string& path) {
}
KRDirectionalLight *KRScene::findFirstDirectionalLight(KRNode &node) {
KRDirectionalLight *pLight = dynamic_cast<KRDirectionalLight *>(&node);
if(pLight) {
return pLight;
} else {
const std::vector<KRNode *> children = node.getChildren();
for(std::vector<KRNode *>::const_iterator itr=children.begin(); itr < children.end(); ++itr) {
pLight = findFirstDirectionalLight(*(*itr));
if(pLight) {
return pLight;
}
}
}
return NULL;
}
KRScene *KRScene::LoadXML(const std::string& path)
{
tinyxml2::XMLDocument doc;
@@ -114,6 +138,13 @@ KRScene *KRScene::LoadXML(const std::string& path)
if(n) {
new_scene->getRootNode()->addChild(n);
}
return new_scene;
}
KRDirectionalLight *KRScene::getFirstDirectionalLight()
{
if(m_pFirstDirectionalLight == NULL) {
m_pFirstDirectionalLight = findFirstDirectionalLight(*m_pRootNode);
}
return m_pFirstDirectionalLight;
}

5
KREngine/KREngine/Classes/KRScene.h
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@@ -44,6 +44,7 @@
#import "KRNode.h"
class KRBoundingVolume;
class KRInstance;
class KRDirectionalLight;
using std::vector;
@@ -58,6 +59,7 @@ public:
static KRScene *LoadXML(const std::string& path);
KRNode *getRootNode();
KRDirectionalLight *getFirstDirectionalLight();
#if TARGET_OS_IPHONE
@@ -67,8 +69,11 @@ public:
KRBoundingVolume getExtents(KRContext *pContext);
private:
KRDirectionalLight *findFirstDirectionalLight(KRNode &node);
KRNode *m_pRootNode;
KRBoundingVolume *m_pExtents;
KRDirectionalLight *m_pFirstDirectionalLight;
};

9
KREngine/KREngine/Classes/KRShader.cpp
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@@ -114,6 +114,7 @@ KRShader::KRShader(char *szKey, std::string options, std::string vertShaderSourc
m_uniforms[KRENGINE_UNIFORM_SHADOWMVP3] = glGetUniformLocation(m_iProgram, "shadow_mvp3");
m_uniforms[KRENGINE_UNIFORM_LIGHTDIRECTION] = glGetUniformLocation(m_iProgram, "lightDirection");
m_uniforms[KRENGINE_UNIFORM_CAMERAPOS] = glGetUniformLocation(m_iProgram, "cameraPosition");
m_uniforms[KRENGINE_UNIFORM_VIEWPORT] = glGetUniformLocation(m_iProgram, "viewport");
m_uniforms[KRENGINE_UNIFORM_DIFFUSETEXTURE] = glGetUniformLocation(m_iProgram, "diffuseTexture");
m_uniforms[KRENGINE_UNIFORM_SPECULARTEXTURE] = glGetUniformLocation(m_iProgram, "specularTexture");
@@ -193,6 +194,14 @@ void KRShader::bind(KRCamera *pCamera, KRMat4 &matModelToView, KRMat4 &mvpMatrix
(GLfloat)cameraPosition.z
);
glUniform4f(
m_uniforms[KRENGINE_UNIFORM_VIEWPORT],
(GLfloat)0.0,
(GLfloat)0.0,
(GLfloat)pCamera->getViewportSize().x,
(GLfloat)pCamera->getViewportSize().y
);
// Bind the shadowmap space matrices
for(int iShadow=0; iShadow < cShadowBuffers; iShadow++) {
glUniformMatrix4fv(m_uniforms[KRENGINE_UNIFORM_SHADOWMVP1 + iShadow], 1, GL_FALSE, pShadowMatrices[iShadow].getPointer());

1
KREngine/KREngine/Classes/KRShader.h
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@@ -72,6 +72,7 @@ public:
KRENGINE_UNIFORM_M2V,
KRENGINE_UNIFORM_LIGHTDIRECTION,
KRENGINE_UNIFORM_CAMERAPOS,
KRENGINE_UNIFORM_VIEWPORT,
KRENGINE_UNIFORM_DIFFUSETEXTURE,
KRENGINE_UNIFORM_SPECULARTEXTURE,
KRENGINE_UNIFORM_NORMALTEXTURE,

15
KREngine/KREngine/Shaders/ObjectShader.fsh
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@@ -114,10 +114,14 @@
#endif
#if GBUFFER_PASS == 1 || GBUFFER_PASS == 3
uniform mediump vec4 viewport;
#endif
void main()
{
#if GBUFFER_PASS == 2 || GBUFFER_PASS == 3
mediump vec2 gbuffer_uv = vec2(gl_FragCoord.x / 768.0, gl_FragCoord.y / 1024.0);
mediump vec2 gbuffer_uv = vec2(gl_FragCoord.xy / viewport.zw);
#endif
#if GBUFFER_PASS == 2
@@ -161,7 +165,11 @@ void main()
#endif
mediump float specularFactor = 0.0;
if(material_shininess > 0.0) {
specularFactor = max(0.0,pow(dot(halfVec,normal), material_shininess));
#if GBUFFER_PASS == 3
specularFactor = gbuffer_specular_factor;
#else
specularFactor = max(0.0,pow(dot(halfVec,normal), material_shininess));
#endif
}
#if SHADOW_QUALITY == 1
@@ -249,5 +257,8 @@ void main()
mediump vec3 lightMapColor = vec3(texture2D(shadowTexture1, lightmap_uv));
gl_FragColor = vec4(gl_FragColor.r * lightMapColor.r, gl_FragColor.g * lightMapColor.g, gl_FragColor.b * lightMapColor.b, 1.0);
#endif
//gl_FragColor = vec4(vec3(specularFactor), 1.0);
#endif
}

40
KREngine/KREngine/Shaders/light_directional.fsh
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@@ -29,23 +29,47 @@
uniform sampler2D gbuffer_frame;
uniform sampler2D gbuffer_depth;
uniform highp vec3 lightDirection; // Must be normalized before entering shader
uniform highp vec3 lightDirection; // Must be normalized and converted to view space before entering shader
uniform highp mat4 model_to_view_matrix;
uniform mediump vec4 viewport;
void main()
{
mediump vec2 gbuffer_uv = vec2(gl_FragCoord.x / 768.0, gl_FragCoord.y / 1024.0);
mediump vec2 gbuffer_uv = vec2(gl_FragCoord.xy / viewport.zw);
highp vec3 view_space_vertex_position;
view_space_vertex_position.xy = ((2.0 * gl_FragCoord.xy) - (2.0 * viewport.xy)) / (viewport.zw) - 1.0;
/*view_space_vertex_position.z = -(2.0 * texture2D(gbuffer_depth, gbuffer_uv).r - gl_DepthRange.near - gl_DepthRange.far) /
(gl_DepthRange.far - gl_DepthRange.near) - 1.0;
*/
view_space_vertex_position.z = -texture2D(gbuffer_depth, gbuffer_uv).r;
lowp vec4 gbuffer_sample = texture2D(gbuffer_frame, gbuffer_uv);
mediump vec3 gbuffer_normal = normalize(2.0 * gbuffer_sample.rgb - 1.0);
mediump float gbuffer_specular_exponent = gbuffer_sample.a;
mediump vec3 gbuffer_normal = 2.0 * gbuffer_sample.rgb - 1.0;
mediump float gbuffer_specular_exponent = gbuffer_sample.a * 100.0;
mediump vec3 view_space_light = lightDirection; // vec3(model_to_view_matrix * vec4(lightDirection, 1.0));
mediump vec3 view_space_light = vec3(model_to_view_matrix * vec4(lightDirection, 1.0));
mediump float lamberFactor = max(0.0,dot(view_space_light, gbuffer_normal));
gl_FragColor = vec4(vec3(lamberFactor), 0.0);
highp vec3 halfVec = normalize((normalize(vec3(0.0, 0.0, 0.0) - view_space_vertex_position) + view_space_light)); // Normalizing anyways, no need to divide by 2
//highp vec3 halfVec = normalize(view_space_light - normalize(view_space_vertex_position));
//highp vec3 halfVec = normalize(vec3(0.0, 0.0, -1.0) - normalize(view_space_vertex_position));
mediump float specularFactor = max(0.0,pow(clamp(dot(halfVec,normalize(gbuffer_normal)), 0.0, 1.0), gbuffer_specular_exponent));
//mediump float specularFactor = 0.0;
//specularFactor = halfVec.z;
gl_FragColor = vec4(vec3(lamberFactor), specularFactor);
}