Use deferred lighting for voxels as well as metavoxels.

interface/resources/shaders/cascaded_shadow_map.frag

@@ -1,40 +0,0 @@
-#version 120
-
-//
-//  cascaded_shadow_map.frag
-//  fragment shader
-//
-//  Created by Andrzej Kapolka on 5/29/14.
-//  Copyright 2014 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-// the shadow texture
-uniform sampler2DShadow shadowMap;
-
-// the distances to the cascade sections
-uniform vec3 shadowDistances;
-
-// the inverse of the size of the shadow map
-const float shadowScale = 1.0 / 2048.0;
-
-// the color in shadow
-varying vec4 shadowColor;
-
-// the interpolated position
-varying vec4 position;
-
-void main(void) {
-    // compute the index of the cascade to use and the corresponding texture coordinates
-    int shadowIndex = int(dot(step(vec3(position.z), shadowDistances), vec3(1.0, 1.0, 1.0)));
-    vec3 shadowTexCoord = vec3(dot(gl_EyePlaneS[shadowIndex], position), dot(gl_EyePlaneT[shadowIndex], position),
-        dot(gl_EyePlaneR[shadowIndex], position));
-    
-    gl_FragColor = mix(shadowColor, gl_Color, 0.25 *
-        (shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, -shadowScale, 0.0)).r +
-        shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, shadowScale, 0.0)).r +
-        shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, -shadowScale, 0.0)).r +
-        shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, shadowScale, 0.0)).r));
-}

interface/resources/shaders/cascaded_shadow_map.vert

@@ -1,33 +0,0 @@
-#version 120
-
-//
-//  cascaded_shadow_map.vert
-//  vertex shader
-//
-//  Created by Andrzej Kapolka on 5/29/14.
-//  Copyright 2014 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-// the color in shadow
-varying vec4 shadowColor;
-
-// the interpolated position
-varying vec4 position;
-
-void main(void) {
-    // the shadow color includes only the ambient terms
-    shadowColor = gl_Color * (gl_LightModel.ambient + gl_LightSource[0].ambient);
-    
-    // the normal color includes diffuse
-    vec4 normal = normalize(gl_ModelViewMatrix * vec4(gl_Normal, 0.0));
-    gl_FrontColor = shadowColor + gl_Color * (gl_LightSource[0].diffuse * max(0.0, dot(normal, gl_LightSource[0].position)));
-    
-    // generate the shadow texture coordinates using the eye position
-    position = gl_ModelViewMatrix * gl_Vertex;
-    
-    // use the fixed function transform
-    gl_Position = ftransform();
-}

interface/resources/shaders/perlin_modulate.frag

@@ -26,6 +26,9 @@ const float amplitude = 0.5;
 // the position in model space
 varying vec3 position;
 
+// the normal in view space
+varying vec4 normal;
+
 // gradient based on gradients from cube edge centers rather than random from texture lookup
 float randomEdgeGrad(int hash, vec3 position){
     int h = int(mod(hash, 16));
@@ -114,7 +117,8 @@ void main(void) {
 
     // apply vertex lighting
     vec3 color = gl_Color.rgb * vec3(noise, noise, noise);
-    gl_FragColor = vec4(color, 1);
+    gl_FragData[0] = vec4(color, 1);
+    gl_FragData[1] = normalize(normal) * 0.5 + vec4(0.5, 0.5, 0.5, 1.0);
 }
 
 
@@ -156,4 +160,4 @@ float perlin(vec3 location) {
         mix(mix(ffcv, cfcv, params.x), mix(fccv, cccv, params.x), params.y),
         params.z);
 }
-*/
+*/

interface/resources/shaders/perlin_modulate.vert

@@ -14,10 +14,12 @@
 // the position in model space
 varying vec3 position;
 
+// the interpolated normal
+varying vec4 normal;
+
 void main(void) {
     position = gl_Vertex.xyz;
-    vec4 normal = normalize(gl_ModelViewMatrix * vec4(gl_Normal, 0.0));
-    gl_FrontColor = gl_Color * (gl_LightModel.ambient + gl_LightSource[0].ambient +
-        gl_LightSource[0].diffuse * max(0.0, dot(normal, gl_LightSource[0].position)));
+    normal = vec4(gl_NormalMatrix * gl_Normal, 0.0);
+    gl_FrontColor = gl_Color;
     gl_Position = ftransform();
 }

interface/resources/shaders/shadow_map.frag

@@ -1,28 +0,0 @@
-#version 120
-
-//
-//  shadow_map.frag
-//  fragment shader
-//
-//  Created by Andrzej Kapolka on 11/21/13.
-//  Copyright 2013 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-uniform sampler2DShadow shadowMap;
-
-// the inverse of the size of the shadow map
-const float shadowScale = 1.0 / 2048.0;
-
-// the color in shadow
-varying vec4 shadowColor;
-
-void main(void) {
-    gl_FragColor = mix(shadowColor, gl_Color, 0.25 *
-        (shadow2D(shadowMap, gl_TexCoord[0].stp + vec3(-shadowScale, -shadowScale, 0.0)).r +
-        shadow2D(shadowMap, gl_TexCoord[0].stp + vec3(-shadowScale, shadowScale, 0.0)).r +
-        shadow2D(shadowMap, gl_TexCoord[0].stp + vec3(shadowScale, -shadowScale, 0.0)).r +
-        shadow2D(shadowMap, gl_TexCoord[0].stp + vec3(shadowScale, shadowScale, 0.0)).r));
-}

interface/resources/shaders/shadow_map.vert

@@ -1,32 +0,0 @@
-#version 120
-
-//
-//  shadow_map.vert
-//  vertex shader
-//
-//  Created by Andrzej Kapolka on 3/27/14.
-//  Copyright 2014 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-// the color in shadow
-varying vec4 shadowColor;
-
-void main(void) {
-    // the shadow color includes only the ambient terms
-    shadowColor = gl_Color * (gl_LightModel.ambient + gl_LightSource[0].ambient);
-    
-    // the normal color includes diffuse
-    vec4 normal = normalize(gl_ModelViewMatrix * vec4(gl_Normal, 0.0));
-    gl_FrontColor = shadowColor + gl_Color * (gl_LightSource[0].diffuse * max(0.0, dot(normal, gl_LightSource[0].position)));
-    
-    // generate the shadow texture coordinates using the eye position
-    vec4 eyePosition = gl_ModelViewMatrix * gl_Vertex;
-    gl_TexCoord[0] = vec4(dot(gl_EyePlaneS[0], eyePosition), dot(gl_EyePlaneT[0], eyePosition),
-        dot(gl_EyePlaneR[0], eyePosition), 1.0);
-    
-    // use the fixed function transform
-    gl_Position = ftransform();
-}

interface/resources/shaders/voxel.frag

@@ -0,0 +1,21 @@
+#version 120
+
+//
+//  voxel.frag
+//  fragment shader
+//
+//  Created by Andrzej Kapolka on 9/11/14.
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+// the interpolated normal
+varying vec4 normal;
+
+void main(void) {
+    // store the color and normal directly
+    gl_FragData[0] = gl_Color;
+    gl_FragData[1] = normalize(normal) * 0.5 + vec4(0.5, 0.5, 0.5, 1.0);
+}

interface/resources/shaders/voxel.vert

@@ -0,0 +1,26 @@
+#version 120
+
+//
+//  voxel.vert
+//  vertex shader
+//
+//  Created by Andrzej Kapolka on 9/11/14.
+//  Copyright 2014 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+// the interpolated normal
+varying vec4 normal;
+
+void main(void) {
+    // store the normal for interpolation
+    normal = vec4(gl_NormalMatrix * gl_Normal, 0.0);
+    
+    // use the standard position
+    gl_Position = ftransform();
+    
+    // store the color directly
+    gl_FrontColor = gl_Color;
+}

interface/src/Application.cpp

@@ -2842,8 +2842,10 @@ void Application::displaySide(Camera& whichCamera, bool selfAvatarOnly) {
             _audioReflector.render();
         }
         
-        //  Draw voxels
+        _deferredLightingEffect.prepare();
         bool deferredLightingRequired = false;
+        
+        //  Draw voxels
         if (Menu::getInstance()->isOptionChecked(MenuOption::Voxels)) {
             PerformanceTimer perfTimer("voxels");
             PerformanceWarning warn(Menu::getInstance()->isOptionChecked(MenuOption::PipelineWarnings),

interface/src/MetavoxelSystem.cpp

@@ -121,23 +121,13 @@ int RenderVisitor::visit(MetavoxelInfo& info) {
     return STOP_RECURSION;
 }
 
-const GLenum COLOR_DRAW_BUFFERS[] = { GL_COLOR_ATTACHMENT0 };
-const GLenum NORMAL_DRAW_BUFFERS[] = { GL_COLOR_ATTACHMENT1 };
-const GLenum COLOR_NORMAL_DRAW_BUFFERS[] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1 };
-
 void MetavoxelSystem::render() {
     // update the frustum
     ViewFrustum* viewFrustum = Application::getInstance()->getDisplayViewFrustum();
     _frustum.set(viewFrustum->getFarTopLeft(), viewFrustum->getFarTopRight(), viewFrustum->getFarBottomLeft(),
         viewFrustum->getFarBottomRight(), viewFrustum->getNearTopLeft(), viewFrustum->getNearTopRight(),
         viewFrustum->getNearBottomLeft(), viewFrustum->getNearBottomRight());
-    
-    // clear the normal buffer
-    glDrawBuffers(sizeof(NORMAL_DRAW_BUFFERS) / sizeof(NORMAL_DRAW_BUFFERS[0]), NORMAL_DRAW_BUFFERS);
-    glClear(GL_COLOR_BUFFER_BIT);
-
-    glDrawBuffers(sizeof(COLOR_DRAW_BUFFERS) / sizeof(COLOR_DRAW_BUFFERS[0]), COLOR_DRAW_BUFFERS);
-    
+   
     RenderVisitor renderVisitor(getLOD());
     guideToAugmented(renderVisitor, true);
     
@@ -834,7 +824,7 @@ void HeightfieldBuffer::render(bool cursor) {
         
         glDrawRangeElements(GL_TRIANGLES, 0, vertexCount - 1, indexCount, GL_UNSIGNED_INT, 0);
         
-        glDrawBuffers(sizeof(COLOR_DRAW_BUFFERS) / sizeof(COLOR_DRAW_BUFFERS[0]), COLOR_DRAW_BUFFERS);
+        Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, false);
         
         glDepthFunc(GL_LEQUAL);
         glDepthMask(false);
@@ -907,7 +897,7 @@ void HeightfieldBuffer::render(bool cursor) {
         glDepthMask(true);
         glDepthFunc(GL_LESS);
         
-        glDrawBuffers(sizeof(COLOR_NORMAL_DRAW_BUFFERS) / sizeof(COLOR_NORMAL_DRAW_BUFFERS[0]), COLOR_NORMAL_DRAW_BUFFERS);
+        Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, true);
         
         DefaultMetavoxelRendererImplementation::getBaseHeightfieldProgram().bind();
         
@@ -936,7 +926,7 @@ void HeightfieldBuffer::render(bool cursor) {
 QHash<int, HeightfieldBuffer::BufferPair> HeightfieldBuffer::_bufferPairs;
 
 void HeightfieldPreview::render(const glm::vec3& translation, float scale) const {
-    glDrawBuffers(sizeof(COLOR_NORMAL_DRAW_BUFFERS) / sizeof(COLOR_NORMAL_DRAW_BUFFERS[0]), COLOR_NORMAL_DRAW_BUFFERS);
+    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, true);
     
     glDisable(GL_BLEND);
     glEnable(GL_CULL_FACE);
@@ -969,7 +959,7 @@ void HeightfieldPreview::render(const glm::vec3& translation, float scale) const
     glDisable(GL_CULL_FACE);
     glEnable(GL_BLEND);
     
-    glDrawBuffers(sizeof(COLOR_DRAW_BUFFERS) / sizeof(COLOR_DRAW_BUFFERS[0]), COLOR_DRAW_BUFFERS);
+    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, false);
 }
 
 VoxelBuffer::VoxelBuffer(const QVector<VoxelPoint>& vertices, const QVector<int>& indices,
@@ -1017,7 +1007,7 @@ void VoxelBuffer::render(bool cursor) {
     glDrawRangeElements(GL_QUADS, 0, _vertexCount - 1, _indexCount, GL_UNSIGNED_INT, 0);
     
     if (!_materials.isEmpty()) {
-        glDrawBuffers(sizeof(COLOR_DRAW_BUFFERS) / sizeof(COLOR_DRAW_BUFFERS[0]), COLOR_DRAW_BUFFERS);
+        Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, false);
         
         glDepthFunc(GL_LEQUAL);
         glDepthMask(false);
@@ -1087,7 +1077,7 @@ void VoxelBuffer::render(bool cursor) {
         glDepthMask(true);
         glDepthFunc(GL_LESS);
         
-        glDrawBuffers(sizeof(COLOR_NORMAL_DRAW_BUFFERS) / sizeof(COLOR_NORMAL_DRAW_BUFFERS[0]), COLOR_NORMAL_DRAW_BUFFERS);
+        Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, true);
         
         DefaultMetavoxelRendererImplementation::getSplatVoxelProgram().disableAttributeArray(locations.materials);
         DefaultMetavoxelRendererImplementation::getSplatVoxelProgram().disableAttributeArray(locations.materialWeights);
@@ -2132,7 +2122,7 @@ void DefaultMetavoxelRendererImplementation::render(MetavoxelData& data, Metavox
     
     _pointProgram.release();
     
-    glDrawBuffers(sizeof(COLOR_NORMAL_DRAW_BUFFERS) / sizeof(COLOR_NORMAL_DRAW_BUFFERS[0]), COLOR_NORMAL_DRAW_BUFFERS);
+    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, true);
     
     glEnable(GL_CULL_FACE);
     glEnable(GL_ALPHA_TEST);
@@ -2175,7 +2165,7 @@ void DefaultMetavoxelRendererImplementation::render(MetavoxelData& data, Metavox
     glDisableClientState(GL_COLOR_ARRAY);
     glDisableClientState(GL_NORMAL_ARRAY);
     
-    glDrawBuffers(sizeof(COLOR_DRAW_BUFFERS) / sizeof(COLOR_DRAW_BUFFERS[0]), COLOR_DRAW_BUFFERS);
+    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, false);
 }
 
 void DefaultMetavoxelRendererImplementation::loadSplatProgram(const char* type,

interface/src/renderer/DeferredLightingEffect.cpp

@@ -26,6 +26,13 @@ void DeferredLightingEffect::init() {
         _directionalLightCascadedShadowMapLocations);
 }
 
+void DeferredLightingEffect::prepare() {
+    // clear the normal buffer
+    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(false, true);
+    glClear(GL_COLOR_BUFFER_BIT);
+    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, false);
+}
+
 void DeferredLightingEffect::render() {
     // perform deferred lighting, rendering to free fbo
     glPushMatrix();
@@ -38,6 +45,7 @@ void DeferredLightingEffect::render() {
     glDisable(GL_BLEND);
     glDisable(GL_LIGHTING);
     glDisable(GL_DEPTH_TEST);
+    glDisable(GL_COLOR_MATERIAL);
     glDepthMask(false);
     
     QOpenGLFramebufferObject* primaryFBO = Application::getInstance()->getTextureCache()->getPrimaryFramebufferObject();
@@ -133,6 +141,7 @@ void DeferredLightingEffect::render() {
     glDisable(GL_TEXTURE_2D);
     
     glEnable(GL_LIGHTING);
+    glEnable(GL_COLOR_MATERIAL);
     glEnable(GL_DEPTH_TEST);
     glDepthMask(true);
     

interface/src/renderer/DeferredLightingEffect.h

@@ -19,6 +19,8 @@ class DeferredLightingEffect {
 public:
     
     void init();
+    
+    void prepare();
     void render();
 
 private:

interface/src/renderer/TextureCache.cpp

@@ -242,6 +242,18 @@ GLuint TextureCache::getPrimaryNormalTextureID() {
     return _primaryNormalTextureID;
 }
 
+void TextureCache::setPrimaryDrawBuffers(bool color, bool normal) {
+    GLenum buffers[2];
+    int bufferCount = 0;
+    if (color) {
+        buffers[bufferCount++] = GL_COLOR_ATTACHMENT0;
+    }
+    if (normal) {
+        buffers[bufferCount++] = GL_COLOR_ATTACHMENT1;
+    }
+    glDrawBuffers(bufferCount, buffers);
+}
+
 QOpenGLFramebufferObject* TextureCache::getSecondaryFramebufferObject() {
     if (!_secondaryFramebufferObject) {
         _secondaryFramebufferObject = createFramebufferObject();

interface/src/renderer/TextureCache.h

@@ -64,6 +64,9 @@ public:
     /// Returns the ID of the primary framebuffer object's normal texture.
     GLuint getPrimaryNormalTextureID();
     
+    /// Enables or disables draw buffers on the primary framebuffer.  Note: the primary framebuffer must be bound.
+    void setPrimaryDrawBuffers(bool color, bool normal);
+    
     /// Returns a pointer to the secondary framebuffer object, used as an additional render target when performing full
     /// screen effects.
     QOpenGLFramebufferObject* getSecondaryFramebufferObject();

interface/src/voxels/VoxelSystem.cpp

@@ -506,29 +506,13 @@ void VoxelSystem::initVoxelMemory() {
         _memoryUsageRAM += (sizeof(GLubyte) * vertexPointsPerVoxel * _maxVoxels);
 
         // create our simple fragment shader if we're the first system to init
-        if (!_shadowMapProgram.isLinked()) {
-            _shadowMapProgram.addShaderFromSourceFile(QGLShader::Vertex,
-                Application::resourcesPath() + "shaders/shadow_map.vert");
-            _shadowMapProgram.addShaderFromSourceFile(QGLShader::Fragment,
-                Application::resourcesPath() + "shaders/shadow_map.frag");
-            _shadowMapProgram.link();
-
-            _shadowMapProgram.bind();
-            _shadowMapProgram.setUniformValue("shadowMap", 0);
-            _shadowMapProgram.release();
-            
-            _cascadedShadowMapProgram.addShaderFromSourceFile(QGLShader::Vertex,
-                Application::resourcesPath() + "shaders/cascaded_shadow_map.vert");
-            _cascadedShadowMapProgram.addShaderFromSourceFile(QGLShader::Fragment,
-                Application::resourcesPath() + "shaders/cascaded_shadow_map.frag");
-            _cascadedShadowMapProgram.link();
-
-            _cascadedShadowMapProgram.bind();
-            _cascadedShadowMapProgram.setUniformValue("shadowMap", 0);
-            _shadowDistancesLocation = _cascadedShadowMapProgram.uniformLocation("shadowDistances");
-            _cascadedShadowMapProgram.release();
+        if (!_program.isLinked()) {
+            _program.addShaderFromSourceFile(QGLShader::Vertex,
+                Application::resourcesPath() + "shaders/voxel.vert");
+            _program.addShaderFromSourceFile(QGLShader::Fragment,
+                Application::resourcesPath() + "shaders/voxel.frag");
+            _program.link();
         }
-        
     }
     _renderer = new PrimitiveRenderer(_maxVoxels);
 
@@ -1150,10 +1134,8 @@ glm::vec3 VoxelSystem::computeVoxelVertex(const glm::vec3& startVertex, float vo
     return startVertex + glm::vec3(identityVertex[0], identityVertex[1], identityVertex[2]) * voxelScale;
 }
 
+ProgramObject VoxelSystem::_program;
 ProgramObject VoxelSystem::_perlinModulateProgram;
-ProgramObject VoxelSystem::_shadowMapProgram;
-ProgramObject VoxelSystem::_cascadedShadowMapProgram;
-int VoxelSystem::_shadowDistancesLocation;
 
 void VoxelSystem::init() {
     if (_initialized) {
@@ -1478,41 +1460,31 @@ void VoxelSystem::render() {
 }
 
 void VoxelSystem::applyScaleAndBindProgram(bool texture) {
-
-    if (Menu::getInstance()->getShadowsEnabled()) {
-        if (Menu::getInstance()->isOptionChecked(MenuOption::CascadedShadows)) {
-            _cascadedShadowMapProgram.bind();
-            _cascadedShadowMapProgram.setUniform(_shadowDistancesLocation, Application::getInstance()->getShadowDistances());
-        } else {
-            _shadowMapProgram.bind();
-        }
-        glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getShadowDepthTextureID());
-
-    } else if (texture) {
+    if (texture) {
         bindPerlinModulateProgram();
         glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getPermutationNormalTextureID());
+    } else {
+        _program.bind();
     }
 
     glPushMatrix();
     glScalef(_treeScale, _treeScale, _treeScale);
+    
+    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, true);
 }
 
 void VoxelSystem::removeScaleAndReleaseProgram(bool texture) {
     // scale back down to 1 so heads aren't massive
     glPopMatrix();
 
-    if (Menu::getInstance()->getShadowsEnabled()) {
-        if (Menu::getInstance()->isOptionChecked(MenuOption::CascadedShadows)) {
-            _cascadedShadowMapProgram.release();
-        } else {
-            _shadowMapProgram.release();
-        }
-        glBindTexture(GL_TEXTURE_2D, 0);
-        
-    } else if (texture) {
+    if (texture) {
         _perlinModulateProgram.release();
         glBindTexture(GL_TEXTURE_2D, 0);
+    } else {
+        _program.release();
     }
+    
+    Application::getInstance()->getTextureCache()->setPrimaryDrawBuffers(true, false);
 }
 
 int VoxelSystem::_nodeCount = 0;

interface/src/voxels/VoxelSystem.h

@@ -228,10 +228,8 @@ private:
 
     bool _voxelsDirty;
 
+    static ProgramObject _program;
     static ProgramObject _perlinModulateProgram;
-    static ProgramObject _shadowMapProgram;
-    static ProgramObject _cascadedShadowMapProgram;
-    static int _shadowDistancesLocation;
 
     static void bindPerlinModulateProgram();