paysages : Explorer texturing (WIP).

git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@321 b1fd45b6-86a6-48da-8261-f70d1f35bdcc

TODO

@@ -11,11 +11,17 @@ Technology Preview 2 :
 - Add a zone editor dialog for localized textures.
 - Add a terrain modifier dialog with zones.
 - Add a noise filler (and maybe noise intervals ?).
-- Fix the sun appearance.
+- Fix the distorted sun appearance.
 - Improve curve editor.
    => Add curve modes
    => Improve curve rendering
    => Add axis labels
+- Improve 3d explorer
+   => Store computed vertices in memory, using chunks
+   => Compute the ground texture by chunk
+   => Don't display the water if it's below all ground
+   => Add the sun position
+   => Try to overcome the near frustum cutting
 - Water and terrain LOD moves with the camera, fix it like in the wanderer.
 - Pause previews drawing of main window when a dialog is opened.
 - Interrupt preview chunk renderings that will be discarded at commit, or that are no more visible.

gui_qt/wandererchunk.cpp

@@ -0,0 +1,104 @@
+#include "wandererchunk.h"
+
+#include <math.h>
+#include <stdlib.h>
+#include <QMutex>
+#include <QImage>
+#include <QColor>
+#include <QGLWidget>
+#include "../lib_paysages/color.h"
+#include "../lib_paysages/tools.h"
+
+WandererChunk::WandererChunk(double x, double z, double size)
+{
+    _startx = x;
+    _startz = z;
+    _dirty = true;
+    _chunksize = size;
+    _nbsubchunks = 4;
+    _subchunksize = size / (double)_nbsubchunks;
+    _texture = new QImage(4, 4, QImage::Format_ARGB32);
+    _texture->fill(QColor(0, 200, 0));
+    _texture_id = 0;
+    _need_texture_upload = true;
+    _heightmap = (double*)malloc(sizeof(double) * (_nbsubchunks + 1) * (_nbsubchunks + 1));
+    //_heightmap[0] = _heightmap[1] = _heightmap[2] = _heightmap[3] = toolsRandom();
+}
+
+WandererChunk::~WandererChunk()
+{
+    _lock.lock();
+    delete _texture;
+    free(_heightmap);
+    _lock.unlock();
+}
+
+void WandererChunk::render(QGLWidget* widget)
+{
+    _lock.lock();
+    
+    if (_need_texture_upload)
+    {
+        _need_texture_upload = false;
+        if (_texture_id)
+        {
+            widget->deleteTexture(_texture_id);
+        }
+        _texture_id = widget->bindTexture(*_texture);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    }
+    glBindTexture(GL_TEXTURE_2D, _texture_id);
+
+    double tsize = 1.0 / (double)_nbsubchunks;
+    for (int j = 0; j < _nbsubchunks; j++)
+    {
+        glBegin(GL_QUAD_STRIP);
+        for (int i = 0; i <= _nbsubchunks; i++)
+        {
+            glColor3f(1.0, 1.0, 1.0);
+            glTexCoord2d(tsize * (double)i, 1.0 - tsize * (double)j);
+            glVertex3d(_startx + _subchunksize * (double)i, _heightmap[j * (_nbsubchunks + 1) + i], _startz + _subchunksize * (double)j);
+            glTexCoord2d(tsize * (double)i, 1.0 - tsize * (double)(j + 1));
+            glVertex3d(_startx + _subchunksize * (double)i, _heightmap[(j + 1) * (_nbsubchunks + 1) + i], _startz + _subchunksize * (double)(j + 1));
+        }
+        glEnd();
+    }
+    
+    _lock.unlock();
+}
+
+void WandererChunk::maintain(Renderer* renderer)
+{
+    _lock.lock();
+    
+    if (_dirty)
+    {
+        _dirty = false;
+        
+        // Compute heightmap
+        for (int j = 0; j <= _nbsubchunks; j++)
+        {
+            for (int i = 0; i <= _nbsubchunks; i++)
+            {
+                _heightmap[j * (_nbsubchunks + 1) + i] = renderer->getTerrainHeight(renderer, _startx + _subchunksize * (double)i, _startz + _subchunksize * (double)j);
+            }
+        }
+        
+        // Compute texture
+        int texture_size = 4;
+        double step_size = _chunksize / (double)(texture_size - 1);
+        for (int j = 0; j < texture_size; j++)
+        {
+            for (int i = 0; i < texture_size; i++)
+            {
+                Vector3 location = {_startx + step_size * (double)i, 0.0, _startz + step_size * (double)j};
+                Color color = renderer->applyTextures(renderer, location, step_size);
+                _texture->setPixel(i, j, colorTo32BitRGBA(&color));
+            }
+        }
+        _need_texture_upload = true;
+    }
+    
+    _lock.unlock();
+}

gui_qt/wandererchunk.h

@@ -0,0 +1,32 @@
+#ifndef _PAYSAGES_QT_WANDERERCHUNK_H_
+#define _PAYSAGES_QT_WANDERERCHUNK_H_
+
+#include <QMutex>
+#include <QImage>
+#include <QGLWidget>
+#include "../lib_paysages/renderer.h"
+
+class WandererChunk
+{
+public:
+    WandererChunk(double x, double z, double size);
+    ~WandererChunk();
+    
+    void maintain(Renderer* renderer);
+    void render(QGLWidget* widget);
+    
+private:
+    QMutex _lock;
+    double _startx;
+    double _startz;
+    bool _dirty;
+    double _chunksize;
+    double _subchunksize;
+    int _nbsubchunks;
+    QImage* _texture;
+    GLuint _texture_id;
+    bool _need_texture_upload;
+    double* _heightmap;
+};
+
+#endif

gui_qt/widgetwanderer.cpp

@@ -16,16 +16,36 @@ WidgetWanderer::WidgetWanderer(QWidget *parent, CameraDefinition* camera):
     _base_camera = camera;
     cameraCopyDefinition(camera, &_current_camera);
 
-    this->terrain = terrainCreateDefinition();
-    sceneryGetTerrain(&terrain);
+    _water = waterCreateDefinition();
+    sceneryGetWater(&_water);
     
-    this->water = waterCreateDefinition();
-    sceneryGetWater(&water);
+    _renderer = sceneryCreateStandardRenderer();
 
-    average_frame_time = 0.05;
-    quality = 3;
-    last_mouse_x = 0;
-    last_mouse_y = 0;
+    int chunks = 16;
+    double size = 30.0;
+    double chunksize = size / (double)chunks;
+    double start = -size / 2.0;
+    for (int i = 0; i < chunks; i++)
+    {
+        for (int j = 0; j < chunks; j++)
+        {
+            _chunks.append(new WandererChunk(start + chunksize * (double)i, start + chunksize * (double)j, chunksize));
+        }
+    }
+    
+    _average_frame_time = 0.05;
+    _quality = 3;
+    _last_mouse_x = 0;
+    _last_mouse_y = 0;
+}
+
+WidgetWanderer::~WidgetWanderer()
+{
+    for (int i = 0; i < _chunks.count(); i++)
+    {
+        delete _chunks[i];
+    }
+    waterDeleteDefinition(&_water);
 }
 
 void WidgetWanderer::resetCamera()
@@ -95,8 +115,8 @@ void WidgetWanderer::keyPressEvent(QKeyEvent* event)
 
 void WidgetWanderer::mousePressEvent(QMouseEvent* event)
 {
-    last_mouse_x = event->x();
-    last_mouse_y = event->y();
+    _last_mouse_x = event->x();
+    _last_mouse_y = event->y();
 
     event->ignore();
 }
@@ -121,15 +141,15 @@ void WidgetWanderer::mouseMoveEvent(QMouseEvent* event)
 
     if (event->buttons() & Qt::LeftButton)
     {
-        cameraRotateYaw(&_current_camera, (double)(event->x() - last_mouse_x) * factor * 0.1);
-        cameraRotatePitch(&_current_camera, (double)(event->y() - last_mouse_y) * factor * 0.1);
+        cameraRotateYaw(&_current_camera, (double)(event->x() - _last_mouse_x) * factor * 0.1);
+        cameraRotatePitch(&_current_camera, (double)(event->y() - _last_mouse_y) * factor * 0.1);
         updateGL();
         event->accept();
     }
     else if (event->buttons() & Qt::RightButton)
     {
-        cameraStrafeRight(&_current_camera, (double)(last_mouse_x - event->x()) * factor);
-        cameraStrafeUp(&_current_camera, (double)(event->y() - last_mouse_y) * factor);
+        cameraStrafeRight(&_current_camera, (double)(_last_mouse_x - event->x()) * factor);
+        cameraStrafeUp(&_current_camera, (double)(event->y() - _last_mouse_y) * factor);
         updateGL();
         event->accept();
     }
@@ -138,8 +158,8 @@ void WidgetWanderer::mouseMoveEvent(QMouseEvent* event)
         event->ignore();
     }
 
-    last_mouse_x = event->x();
-    last_mouse_y = event->y();
+    _last_mouse_x = event->x();
+    _last_mouse_y = event->y();
 }
 
 void WidgetWanderer::wheelEvent(QWheelEvent* event)
@@ -174,7 +194,6 @@ void WidgetWanderer::initializeGL()
     glClearColor(0.4, 0.7, 0.8, 0.0);
 
     glDisable(GL_LIGHTING);
-    glDisable(GL_TEXTURE);
 
     glFrontFace(GL_CCW);
     glCullFace(GL_BACK);
@@ -187,6 +206,10 @@ void WidgetWanderer::initializeGL()
     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
     glEnable(GL_LINE_SMOOTH);
     glLineWidth(1.0);
+
+    glDisable(GL_FOG);
+    
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 }
 
 void WidgetWanderer::resizeGL(int w, int h)
@@ -198,74 +221,8 @@ void WidgetWanderer::resizeGL(int w, int h)
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     gluPerspective(_current_camera.yfov * 180.0 / M_PI, _current_camera.xratio, _current_camera.znear, _current_camera.zfar);
-}
     
-static inline void _renderTerrainQuad(TerrainDefinition* terrain, double x, double z, double size)
-{
-    double y1, y2, y3, y4;
-
-    y1 = terrainGetHeight(terrain, x, z);
-    y2 = terrainGetHeight(terrain, x, z + size);
-    y3 = terrainGetHeight(terrain, x + size, z + size);
-    y4 = terrainGetHeight(terrain, x + size, z);
-
-    glColor3f(0.0, 1.0, 0.0);
-    glBegin(GL_LINE_LOOP);
-    glVertex3f(x, y1, z);
-    glVertex3f(x, y2, z + size);
-    glVertex3f(x + size, y3, z + size);
-    glVertex3f(x + size, y4, z);
-    glEnd();
-
-    glColor3f(0.0, 0.5, 0.0);
-    glBegin(GL_QUADS);
-    glVertex3f(x, y1, z);
-    glVertex3f(x, y2, z + size);
-    glVertex3f(x + size, y3, z + size);
-    glVertex3f(x + size, y4, z);
-    glEnd();
-}
-
-static void _renderTerrain(TerrainDefinition* terrain, CameraDefinition* camera, int quality)
-{
-    int chunk_factor, chunk_count, i;
-    double min_chunk_size, visible_chunk_size;
-    double radius_int, radius_ext, chunk_size;
-    double cx, cz;
-
-    min_chunk_size = 1.0 / (double)quality;
-    visible_chunk_size = 1.0 / (double)quality;
-
-    cx = camera->location.x - fmod(camera->location.x, min_chunk_size * 16.0);
-    cz = camera->location.z - fmod(camera->location.z, min_chunk_size * 16.0);
-
-    chunk_factor = 1;
-    chunk_count = 2;
-    radius_int = 0.0;
-    radius_ext = min_chunk_size;
-    chunk_size = min_chunk_size;
-
-    while (radius_ext < 100.0)
-    {
-        for (i = 0; i < chunk_count - 1; i++)
-        {
-            _renderTerrainQuad(terrain, cx - radius_ext + chunk_size * i, cz - radius_ext, chunk_size);
-            _renderTerrainQuad(terrain, cx + radius_int, cz - radius_ext + chunk_size * i, chunk_size);
-            _renderTerrainQuad(terrain, cx + radius_int - chunk_size * i, cz + radius_int, chunk_size);
-            _renderTerrainQuad(terrain, cx - radius_ext, cz + radius_int - chunk_size * i, chunk_size);
-        }
-
-        if (chunk_count % 32 == 0 && chunk_size / radius_int < visible_chunk_size)
-        {
-            chunk_count /= 2;
-            chunk_factor *= 2;
-            /* TODO Fill in gaps with triangles */
-        }
-        chunk_count += 2;
-        chunk_size = min_chunk_size * chunk_factor;
-        radius_int = radius_ext;
-        radius_ext += chunk_size;
-    }
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 }
 
 void WidgetWanderer::paintGL()
@@ -282,29 +239,40 @@ void WidgetWanderer::paintGL()
     gluLookAt(_current_camera.location.x, _current_camera.location.y, _current_camera.location.z, _current_camera.target.x, _current_camera.target.y, _current_camera.target.z, _current_camera.up.x, _current_camera.up.y, _current_camera.up.z);
 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+
+    // Render water
+    glDisable(GL_TEXTURE);
+    glDisable(GL_TEXTURE_2D);
     glColor3f(0.0, 0.0, 1.0);
     glBegin(GL_QUADS);
-    glVertex3f(_current_camera.location.x - 500.0, water.height, _current_camera.location.z - 500.0);
-    glVertex3f(_current_camera.location.x - 500.0, water.height, _current_camera.location.z + 500.0);
-    glVertex3f(_current_camera.location.x + 500.0, water.height, _current_camera.location.z + 500.0);
-    glVertex3f(_current_camera.location.x + 500.0, water.height, _current_camera.location.z - 500.0);
+    glVertex3f(_current_camera.location.x - 500.0, _water.height, _current_camera.location.z - 500.0);
+    glVertex3f(_current_camera.location.x - 500.0, _water.height, _current_camera.location.z + 500.0);
+    glVertex3f(_current_camera.location.x + 500.0, _water.height, _current_camera.location.z + 500.0);
+    glVertex3f(_current_camera.location.x + 500.0, _water.height, _current_camera.location.z - 500.0);
     glEnd();
 
-    _renderTerrain(&terrain, &_current_camera, quality);
+    // Render terrain chunks
+    glEnable(GL_TEXTURE);
+    glEnable(GL_TEXTURE_2D);
+    for (int i = 0; i < _chunks.count(); i++)
+    {
+        _chunks[i]->maintain(&_renderer);
+        
+        _chunks[i]->render(this);
+    }
     
     frame_time = 0.001 * (double)start_time.msecsTo(QTime::currentTime());
     
-    average_frame_time = average_frame_time * 0.8 + frame_time * 0.2;
+    _average_frame_time = _average_frame_time * 0.8 + frame_time * 0.2;
     //printf("%d %f\n", quality, average_frame_time);
     
-    if (average_frame_time > 0.1 && quality > 1)
+    if (_average_frame_time > 0.1 && _quality > 1)
     {
-        quality--;
+        _quality--;
     }
-    if (average_frame_time < 0.04 && quality < 10)
+    if (_average_frame_time < 0.04 && _quality < 10)
     {
-        quality++;
+        _quality++;
     }
 }

gui_qt/widgetwanderer.h

@@ -2,15 +2,19 @@
 #define _PAYSAGES_QT_WIDGETWANDERER_H_
 
 #include <QGLWidget>
+#include "wandererchunk.h"
+#include "../lib_paysages/atmosphere.h"
 #include "../lib_paysages/camera.h"
 #include "../lib_paysages/terrain.h"
 #include "../lib_paysages/water.h"
+#include "../lib_paysages/renderer.h"
 
 class WidgetWanderer : public QGLWidget
 {
     Q_OBJECT
 public:
     WidgetWanderer(QWidget* parent, CameraDefinition* camera);
+    ~WidgetWanderer();
 
 public slots:
     void resetCamera();
@@ -30,14 +34,17 @@ private:
     CameraDefinition _current_camera;
     CameraDefinition* _base_camera;
     
-    TerrainDefinition terrain;
-    WaterDefinition water;
+    Renderer _renderer;
     
-    double average_frame_time;
-    int quality;
+    QVector<WandererChunk*> _chunks;
 
-    int last_mouse_x;
-    int last_mouse_y;
+    WaterDefinition _water;
+    
+    double _average_frame_time;
+    int _quality;
+
+    int _last_mouse_x;
+    int _last_mouse_y;
 };
 
 #endif