vegetation: Removed index variable in impostor shader

It was used for texture coordinates, but is now
precomputed in the vertex array

src/render/opengl/OpenGLVegetation.h

@@ -6,7 +6,7 @@
 #include "OpenGLPart.h"
 #include "DefinitionWatcher.h"
 
-#include <map>
+#include <vector>
 
 namespace paysages {
 namespace opengl {

src/render/opengl/OpenGLVegetationImpostor.cpp

@@ -53,14 +53,13 @@ OpenGLVegetationImpostor::~OpenGLVegetationImpostor() {
 }
 
 void OpenGLVegetationImpostor::render(OpenGLShaderProgram *program, const OpenGLVegetationInstance *instance,
-                                      int instance_index, const Vector3 &camera_location) {
-    if (instance_index == 0 or texture_changed) {
+                                      const Vector3 &camera_location) {
+    if (texture_changed) {
         texture_changed = false;
         state->set("impostorTexture", texture);
     }
 
     int index = getIndex(camera_location, instance->getBase());
-    state->setInt("index", index);
     state->set("offset", instance->getBase());
     state->set("size", 2.0 * instance->getSize());
     program->draw(vertices, state, index * 4, 4);
@@ -142,7 +141,7 @@ void OpenGLVegetationImpostor::setVertex(int i, float u, float v) {
             Matrix4 rotation = matrixForIndex(index);
 
             Vector3 vertex = rotation.multPoint(Vector3(1.0, u, -(v - 0.5)));
-            vertices->set(index * 4 + i, vertex, u, v);
+            vertices->set(index * 4 + i, vertex, (u + (double)px) / (double)parts, (v + (double)py) / (double)parts);
         }
     }
 }

src/render/opengl/OpenGLVegetationImpostor.h

@@ -21,8 +21,7 @@ class OPENGLSHARED_EXPORT OpenGLVegetationImpostor {
     /**
      * Render a single instance using this impostor.
      */
-    void render(OpenGLShaderProgram *program, const OpenGLVegetationInstance *instance, int instance_index,
-                const Vector3 &camera_location);
+    void render(OpenGLShaderProgram *program, const OpenGLVegetationInstance *instance, const Vector3 &camera_location);
 
     /**
      * Prepare the texture grid for a given model.

src/render/opengl/OpenGLVegetationLayer.cpp

@@ -115,9 +115,8 @@ void OpenGLVegetationLayer::render() {
     lock_instances->acquire();
 
     // TODO Instanced rendering
-    int index = 0;
     for (auto instance : instances) {
-        impostor->render(parent->getProgram(), instance, index++, *camera_location);
+        impostor->render(parent->getProgram(), instance, *camera_location);
     }
 
     lock_instances->release();

src/render/opengl/shaders/vegetation.vert

@@ -3,7 +3,6 @@ in highp vec2 uv;
 uniform highp mat4 viewMatrix;
 uniform highp vec3 offset;
 uniform float size;
-uniform int index;
 out vec3 unprojected;
 out vec2 texcoord;
 uniform float waterOffset;
@@ -11,6 +10,6 @@ uniform float waterOffset;
 void main(void)
 {
     unprojected = offset + size * vertex;  // + vec3(0, waterOffset, 0)
-    texcoord = vec2(0.25 * (uv.s + float(mod(index, 4))), 0.25 * (uv.t + float(index / 4)));
+    texcoord = uv;
     gl_Position = viewMatrix * vec4(unprojected, 1.0);
 }