Rendering terrain chunks with new shader system

src/render/opengl/ExplorerChunkTerrain.cpp

@@ -3,7 +3,6 @@
 #include OPENGL_FUNCTIONS_INCLUDE
 #include <cmath>
 #include <QImage>
-#include <QOpenGLTexture>
 #include "ColorProfile.h"
 #include "CameraDefinition.h"
 #include "OpenGLRenderer.h"
@@ -13,13 +12,13 @@
 ExplorerChunkTerrain::ExplorerChunkTerrain(OpenGLRenderer* renderer, double x, double z, double size, int nbchunks, double water_height):
     _renderer(renderer)
 {
-    _color_profile = new ColorProfile;
+    _color_profile = new ColorProfile(ColorProfile::TONE_MAPPING_REIHNARD, 2.0);
 
     priority = 0.0;
     _reset_needed = false;
 
-    _texture = new QImage(1, 1, QImage::Format_ARGB32);
-    texture = new QOpenGLTexture(*_texture);
+    _texture = new QImage(1, 1, QImage::Format_RGBA8888);
+    texture_id = 0;
     _texture_changed = false;
     _texture_current_size = 0;
     _texture_max_size = 0;
@@ -52,7 +51,6 @@ ExplorerChunkTerrain::~ExplorerChunkTerrain()
     _lock_data.lock();
     delete _color_profile;
     delete _texture;
-    delete texture;
     delete tessellated;
     _lock_data.unlock();
 }
@@ -85,9 +83,9 @@ bool ExplorerChunkTerrain::maintain()
                 if (_texture_current_size <= 1 || i % 2 != 0 || j % 2 != 0)
                 {
                     Color color = getTextureColor((double)i / (double)new_texture_size, (double)j / (double)new_texture_size);
-                    color = _color_profile->apply(color);
+                    //color = _color_profile->apply(color);
                     color.normalize();
-                    new_image->setPixel(i, j, color.to32BitBGRA());
+                    new_image->setPixel(i, j, color.to32BitRGBA());
                 }
             }
         }
@@ -213,24 +211,34 @@ void ExplorerChunkTerrain::updatePriority(CameraDefinition* camera)
     _lock_data.unlock();
 }
 
-void ExplorerChunkTerrain::render(OpenGLFunctions* functions)
+void ExplorerChunkTerrain::render(QOpenGLShaderProgram* program, OpenGLFunctions* functions)
 {
     // Put texture in place
     _lock_data.lock();
     if (_texture_changed)
     {
         _texture_changed = false;
-        texture->destroy();
+
         // TODO Only do the scale if not power-of-two textures are unsupported by GPU
-        texture->setData(_texture->scaled(_texture_current_size, _texture_current_size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
-        //texture->setData(*_texture);
-        texture->setWrapMode(QOpenGLTexture::DirectionS, QOpenGLTexture::ClampToEdge);
-        texture->setWrapMode(QOpenGLTexture::DirectionT, QOpenGLTexture::ClampToEdge);
+        QImage tex = _texture->scaled(_texture_current_size, _texture_current_size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+
+        if (texture_id == 0)
+        {
+            GLuint texid;
+            functions->glGenTextures(1, &texid);
+            texture_id = texid;
+        }
+
+        functions->glBindTexture(GL_TEXTURE_2D, texture_id);
+        functions->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        functions->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        functions->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        functions->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+        functions->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex.width(), tex.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, tex.bits());
     }
-    texture->bind();
     _lock_data.unlock();
 
-    // Delegate poly rendering to subclass
+    // Render tessellated mesh
     if (!_reset_needed)
     {
         _lock_data.lock();
@@ -243,15 +251,12 @@ void ExplorerChunkTerrain::render(OpenGLFunctions* functions)
         }
 
         _lock_data.lock(); // TEMP
-        int n = tessellated->getIndexCount();
-        functions->glBegin(GL_TRIANGLES);
-        for (int i = 0; i < n; i++)
-        {
-            TerrainVertex v = tessellated->getVertexByIndex(i);
-            functions->glTexCoord2d(v.uv[0], v.uv[1]);
-            functions->glVertex3d(v.location[0], v.location[1], v.location[2]);
-        }
-        functions->glEnd();
+        // TEMP
+        functions->glActiveTexture(GL_TEXTURE0 + 3);
+        functions->glBindTexture(GL_TEXTURE_2D, texture_id);
+        program->setUniformValue("groundTexture", 3);
+
+        tessellated->render(program, functions);
         _lock_data.unlock(); // TEMP
     }
 }

src/render/opengl/ExplorerChunkTerrain.h

@@ -5,7 +5,7 @@
 
 #include <QMutex>
 class QImage;
-class QOpenGLTexture;
+class QOpenGLShaderProgram;
 
 namespace paysages {
 namespace opengl {
@@ -25,7 +25,7 @@ public:
 
     bool maintain();
     void updatePriority(CameraDefinition* camera);
-    void render(OpenGLFunctions* functions);
+    void render(QOpenGLShaderProgram* program, OpenGLFunctions* functions);
 
     void askReset();
     void setMaxTextureSize(int size);
@@ -62,7 +62,7 @@ private:
     bool _reset_needed;
 
     QImage* _texture;
-    QOpenGLTexture* texture;
+    unsigned int texture_id;
     bool _texture_changed;
     int _texture_current_size;
     int _texture_max_size;

src/render/opengl/OpenGLShaderProgram.cpp

@@ -46,7 +46,7 @@ void OpenGLShaderProgram::addFragmentSource(QString path)
     }
     else
     {
-        logError("Can't open fragment file %s", file.fileName().toStdString().c_str());
+        logError() << "Can't open fragment file " << file.fileName();
     }
 }
 

src/render/opengl/OpenGLShaderProgram.h

@@ -22,15 +22,17 @@ public:
     void drawTriangles(float* vertices, int triangle_count);
     void drawTriangleStrip(float* vertices, int vertex_count);
 
-protected:
+    void bind();
+    void release();
+
     inline QOpenGLShaderProgram* getProgram() const {return program;}
     inline OpenGLRenderer* getRenderer() const {return renderer;}
+
+protected:
     friend class OpenGLVariable;
 
 private:
     void compile();
-    void bind();
-    void release();
 
     bool compiled;
 

src/render/opengl/OpenGLTerrain.cpp

@@ -80,33 +80,16 @@ void OpenGLTerrain::update()
 {
 }
 
-// TEMP
-#include "GL/gl.h"
-#include "GL/glu.h"
-
 void OpenGLTerrain::render()
 {
-    CameraDefinition* camera = renderer->getScenery()->getCamera();
+    program->bind();
 
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-    CameraPerspective perspective = camera->getPerspective();
-    gluPerspective(perspective.yfov * 180.0 / M_PI, perspective.xratio, perspective.znear, perspective.zfar);
-
-    glMatrixMode(GL_MODELVIEW);
-    glLoadIdentity();
-    Vector3 camera_location = camera->getLocation();
-    Vector3 camera_target = camera->getTarget();
-    Vector3 camera_up = camera->getUpVector();
-    gluLookAt(camera_location.x, camera_location.y, camera_location.z, camera_target.x, camera_target.y, camera_target.z, camera_up.x, camera_up.y, camera_up.z);
-
-    // Render chunks
-    glEnable(GL_TEXTURE_2D);
     for (int i = 0; i < _chunks.count(); i++)
     {
-        glColor3f(1.0, 1.0, 1.0);
-        _chunks[i]->render(renderer->getOpenGlFunctions());
+        _chunks[i]->render(program->getProgram(), renderer->getOpenGlFunctions());
     }
+
+    program->release();
 }
 
 static bool _cmpChunks(const ExplorerChunkTerrain* c1, const ExplorerChunkTerrain* c2)

src/render/opengl/VertexArray.cpp

@@ -1 +0,0 @@
-#include "VertexArray.h"

src/render/opengl/VertexArray.h

@@ -3,7 +3,9 @@
 
 #include "opengl_global.h"
 
+#include OPENGL_FUNCTIONS_INCLUDE
 #include <cassert>
+#include <QOpenGLShaderProgram>
 
 namespace paysages {
 namespace opengl {
@@ -21,7 +23,7 @@ public:
         vertex_count = 1;
         vertices = new Vertex[1];
         index_count = 1;
-        indices = new int[1];
+        indices = new unsigned short[1];
     }
 
     ~VertexArray()
@@ -74,7 +76,7 @@ public:
         int cell_count = edge_vertex_count - 1;
 
         index_count = (cell_count / stride) * (cell_count / stride) * 6;
-        indices = new int[index_count];
+        indices = new unsigned short[index_count];
 
         int idx = 0;
         for (int y = 0; y < cell_count; y += stride)
@@ -99,7 +101,7 @@ public:
         return vertices[position];
     }
 
-    Vertex getVertexByIndex(int index)
+    Vertex getVertexByIndex(unsigned short index)
     {
         assert(index >= 0 and index < index_count);
 
@@ -111,13 +113,31 @@ public:
         return getVertex(y * edge_vertex_count + x);
     }
 
-    int getIndex(int position)
+    unsigned short getIndex(int position)
     {
         assert(position >= 0 and position < index_count);
 
         return indices[position];
     }
 
+    void render(QOpenGLShaderProgram* program, OpenGLFunctions* functions)
+    {
+        size_t ptr = (size_t)vertices;
+
+        GLuint vertex = program->attributeLocation("vertex");
+        program->setAttributeArray(vertex, GL_FLOAT, (void*)(ptr + offsetof(Vertex, location)), 3, sizeof(Vertex));
+        program->enableAttributeArray(vertex);
+
+        GLuint uv = program->attributeLocation("uv");
+        program->setAttributeArray(uv, GL_FLOAT, (void*)(ptr + offsetof(Vertex, uv)), 2, sizeof(Vertex));
+        program->enableAttributeArray(uv);
+
+        functions->glDrawElements(GL_TRIANGLES, index_count, GL_UNSIGNED_SHORT, indices);
+
+        program->disableAttributeArray(vertex);
+        program->disableAttributeArray(uv);
+    }
+
 private:
     bool ready;
     bool changed;
@@ -126,7 +146,7 @@ private:
     Vertex* vertices;
 
     int index_count;
-    int* indices;
+    unsigned short* indices;
 };
 
 }

src/render/opengl/opengl.pro

@@ -23,8 +23,7 @@ SOURCES += \
     OpenGLWater.cpp \
     OpenGLSharedState.cpp \
     OpenGLVariable.cpp \
-    OpenGLTerrain.cpp \
-    VertexArray.cpp
+    OpenGLTerrain.cpp
 
 HEADERS +=\
         opengl_global.h \
@@ -83,4 +82,6 @@ OTHER_FILES += \
     shaders/water.frag \
     shaders/bruneton.frag \
     shaders/bruneton.frag \
-    shaders/tonemapping.frag
+    shaders/tonemapping.frag \
+    shaders/terrain.frag \
+    shaders/terrain.vert

src/render/opengl/shaders/resources.qrc

@@ -6,5 +6,7 @@
         <file>water.vert</file>
         <file>bruneton.frag</file>
         <file>tonemapping.frag</file>
+        <file>terrain.frag</file>
+        <file>terrain.vert</file>
     </qresource>
 </RCC>

src/render/opengl/shaders/terrain.frag

@@ -0,0 +1,30 @@
+uniform sampler2D groundTexture;
+varying vec2 texcoord;
+
+void main(void)
+{
+    gl_FragColor = texture2D(groundTexture, texcoord);
+
+    float yoffset = GROUND_OFFSET - waterHeight;
+    vec3 camera = vec3(cameraLocation.x, max(cameraLocation.y + yoffset, 0.0), cameraLocation.z);
+    vec3 location = vec3(unprojected.x, max(unprojected.y + yoffset, 0.0), unprojected.z);
+    vec3 x = vec3(0.0, Rg + camera.y * WORLD_SCALING, 0.0);
+    vec3 v = normalize(location - camera);
+    vec3 s = normalize(sunDirection * SUN_DISTANCE_SCALED - x);
+
+    if (v.y == 0.0)
+    {
+        v.y = -0.000001;
+    }
+
+    float r = length(x);
+    float mu = dot(x, v) / r;
+    float t = length(location - camera) * WORLD_SCALING;
+
+    vec3 attenuation;
+    vec3 inscattering = _getInscatterColor(x, t, v, s, r, mu, attenuation);
+
+    gl_FragColor = gl_FragColor * vec4(attenuation, 0.0) + vec4(inscattering, 0.0);
+
+    gl_FragColor = _toneMappingUncharted(gl_FragColor, 2.0);
+}

src/render/opengl/shaders/terrain.vert

@@ -0,0 +1,12 @@
+attribute highp vec4 vertex;
+attribute highp vec2 uv;
+uniform highp mat4 viewMatrix;
+varying vec3 unprojected;
+varying vec2 texcoord;
+
+void main(void)
+{
+    unprojected = vertex.xyz;
+    texcoord = uv;
+    gl_Position = viewMatrix * vertex;
+}