From 191e4e4d75c2a3c343e843c0161b76f067ba2de6 Mon Sep 17 00:00:00 2001
From: Sebastian Piwell <sebastian.piwell@gmail.com>
Date: Wed, 27 Apr 2016 18:06:41 -0400
Subject: [PATCH] Set up for multipletextures in dataplane

---
 modules/iswa/rendering/cygnetplane.cpp | 16 +++++++++-------
 modules/iswa/rendering/cygnetplane.h   |  1 +
 modules/iswa/rendering/dataplane.cpp   |  5 +++++
 modules/iswa/rendering/dataplane.h     |  2 ++
 modules/iswa/rendering/kameleonplane.h |  1 +
 modules/iswa/rendering/textureplane.h  |  1 +
 modules/iswa/shaders/dataplane_fs.glsl | 24 +++++++++++++++++++++---
 7 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/modules/iswa/rendering/cygnetplane.cpp b/modules/iswa/rendering/cygnetplane.cpp
index 9f342eae96..5f7ecff071 100644
--- a/modules/iswa/rendering/cygnetplane.cpp
+++ b/modules/iswa/rendering/cygnetplane.cpp
@@ -88,26 +88,28 @@ void CygnetPlane::render(const RenderData& data){
     glEnable(GL_ALPHA_TEST);
     glDisable(GL_CULL_FACE);
 
+
     _shader->setUniform("ViewProjection", data.camera.viewProjectionMatrix());
     _shader->setUniform("ModelTransform", transform);
+    setUniforms();
 
     setPscUniforms(*_shader.get(), data.camera, position);
 
-    ghoul::opengl::TextureUnit tfUnits;
+    ghoul::opengl::TextureUnit tfUnits[_transferFunctions.size()];
     if(!_transferFunctions.empty()){
         if(_transferFunctions.size() == 1){
-            tfUnits.activate();
+            tfUnits[0].activate();
             _transferFunctions[0]->bind();
-            _shader->setUniform("tf", tfUnits);
+            _shader->setUniform("tf", tfUnits[0]);
         }
     }
 
-    ghoul::opengl::TextureUnit txUnits;
+    ghoul::opengl::TextureUnit txUnits[_textures.size()];
     if(_textures.size() == 1){
-        txUnits.activate();
+        txUnits[0].activate();
         _textures[0]->bind();
-        _shader->setUniform("texture1", txUnits);
-    }    
+        _shader->setUniform("texture1", txUnits[0]);
+    }
 
     glBindVertexArray(_quad);
     glDrawArrays(GL_TRIANGLES, 0, 6);
diff --git a/modules/iswa/rendering/cygnetplane.h b/modules/iswa/rendering/cygnetplane.h
index b5292e5bc0..5a956232cb 100644
--- a/modules/iswa/rendering/cygnetplane.h
+++ b/modules/iswa/rendering/cygnetplane.h
@@ -42,6 +42,7 @@ public:
 protected:
     virtual bool loadTexture() = 0;
     virtual bool updateTexture() = 0;
+    virtual void setUniforms() = 0;
 
     void createPlane();
     void destroyPlane();
diff --git a/modules/iswa/rendering/dataplane.cpp b/modules/iswa/rendering/dataplane.cpp
index f91c280b4a..ddd7e6dc92 100644
--- a/modules/iswa/rendering/dataplane.cpp
+++ b/modules/iswa/rendering/dataplane.cpp
@@ -173,6 +173,11 @@ bool DataPlane::updateTexture(){
     return false;
 }
 
+void DataPlane::setUniforms(){
+    _shader->setUniform("numTextures", (int) _textures.size());
+    _shader->setUniform("averageValues", false);
+};
+
 void DataPlane::readHeader(){
     if(!_memorybuffer.empty()){
         std::stringstream memorystream(_memorybuffer);
diff --git a/modules/iswa/rendering/dataplane.h b/modules/iswa/rendering/dataplane.h
index a59ad33d82..4d0ee118f3 100644
--- a/modules/iswa/rendering/dataplane.h
+++ b/modules/iswa/rendering/dataplane.h
@@ -46,6 +46,8 @@ class DataPlane : public CygnetPlane {
  private:
     virtual bool loadTexture() override;
     virtual bool updateTexture() override;
+    virtual void setUniforms() override;
+
     void readHeader();
     float* readData();
     void processData(
diff --git a/modules/iswa/rendering/kameleonplane.h b/modules/iswa/rendering/kameleonplane.h
index 064a17dd12..14738bc6c5 100644
--- a/modules/iswa/rendering/kameleonplane.h
+++ b/modules/iswa/rendering/kameleonplane.h
@@ -41,6 +41,7 @@
  private:
  	virtual bool loadTexture() override;
  	virtual bool updateTexture() override;
+ 	virtual void setUniforms() override {};
 
 	static int id();
 
diff --git a/modules/iswa/rendering/textureplane.h b/modules/iswa/rendering/textureplane.h
index 274085ba1d..a1334612dd 100644
--- a/modules/iswa/rendering/textureplane.h
+++ b/modules/iswa/rendering/textureplane.h
@@ -42,6 +42,7 @@
  private:
     virtual bool loadTexture() override;
     virtual bool updateTexture() override;
+    virtual void setUniforms() override {};
 
     static int id();
  };
diff --git a/modules/iswa/shaders/dataplane_fs.glsl b/modules/iswa/shaders/dataplane_fs.glsl
index 70fa633060..e727a583fe 100644
--- a/modules/iswa/shaders/dataplane_fs.glsl
+++ b/modules/iswa/shaders/dataplane_fs.glsl
@@ -22,8 +22,14 @@
  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
  ****************************************************************************************/
 uniform float time;
+
 uniform sampler2D texture1;
+uniform sampler2D textures[10];
 uniform sampler2D tf;
+uniform sampler2D tfs[10];
+
+uniform int numTextures;
+uniform bool averageValues;
 
 // uniform float background;
 
@@ -36,12 +42,24 @@ in vec4 vs_position;
 Fragment getFragment() {
     vec4 position = vs_position;
     float depth = pscDepth(position);
-    vec4 diffuse;
+    vec4 diffuse = vec4(0.0f, 0.0f, 0.0f, 0.0f);
+    float v;
+    if(numTextures > 1){
+        for(uint i=0; i<numTextures; i++){
+            v = texture(textures[i], vec2(vs_st.s, 1-vs_st.t)).r;
+            diffuse += texture(tfs[i], vec2(v,0));
+        }
+    }else{
+        v = texture(texture1, vec2(vs_st.s, 1-vs_st.t)).r;
+        diffuse = texture(tf, vec2(v,0));
+    }
 
+    if(averageValues){
+        diffuse /= numTextures;
+    }
+    
     // diffuse = texture(tf, vec2(1-vs_st.s, 0));
     // diffuse = texture(tf, texture(texture1, vec2(vs_st.s,1-vs_st.t)).r);
-    float v = texture(texture1, vec2(vs_st.s, 1-vs_st.t)).r;
-    diffuse = texture(tf, vec2(v,0));
 
     // if (diffuse.a <= 0.05)
     //     discard;