Beginnings of skybox

log750-lab.pro

@@ -52,7 +52,10 @@ HEADERS  += QGLViewer/camera.h \
     src/glnodes/scenegroup.h
 
 DISTFILES += src/shaders/basicShader.vert \
-             src/shaders/basicShader.frag
+             src/shaders/basicShader.frag \
+    src/shaders/skyboxshader.frag \
+    src/shaders/skyboxshader.vert \
+    src/data/skybox.jpg
 
 FORMS += QGLViewer/ImageInterface.ui mainwindow.ui
 

src/shaders/skyboxshader.frag

@@ -0,0 +1,10 @@
+#version 400 core
+in vec2 texCoords;
+out vec4 fColor;
+
+uniform sampler2D skybox;
+
+void main()
+{
+    fColor = textureCube(skybox, texCoords);
+}

src/shaders/skyboxshader.vert

@@ -0,0 +1,15 @@
+#version 400 core
+layout (location = 0) in vec3 position;
+
+uniform mat4 mvMatrix;
+uniform mat4 projMatrix;
+out vec3 texCoords;
+in vec4 vPosition;
+
+void
+main()
+{
+  gl_Position = projMatrix * mvMatrix * vPosition;
+  texCoords = position;
+}
+

src/viewer/simpleViewer.cpp

@@ -74,8 +74,38 @@ void Viewer::cleanup()
 	doneCurrent();
 }
 
+void Viewer::drawSkybox()
+{
+    // Use the Skybox Shaders
+    skyboxRenderShaderProgram->bind();
+    s_texture->bind();
+
+    // Get projection and camera transformations
+    QMatrix4x4 projectionMatrix;
+    QMatrix4x4 modelViewMatrix;
+    camera()->getProjectionMatrix(projectionMatrix);
+    camera()->getModelViewMatrix(modelViewMatrix);
+
+    // Increase size of skybox
+
+    modelViewMatrix.scale(100);
+
+    skyboxRenderShaderProgram->setUniformValue(s_projMatrixLocation, projectionMatrix);
+    skyboxRenderShaderProgram->setUniformValue(s_mvMatrixLocation, modelViewMatrix);
+//    skyboxRenderShaderProgram->setAttributeValue(s_colorLocation, );
+
+
+    int faces = floor(numVerticesCube/6);
+    for(int i = 0; i < faces; i++){ // 6 vertexes par face
+        glBindVertexArray(m_VAOs[VAO_Cube]);
+
+        glDrawArrays(GL_TRIANGLES, i*6, 6);
+    }
+}
+
 void Viewer::draw()
 {
+    drawSkybox();
 	// Bind our vertex/fragment shaders
 	m_program->bind();
 
@@ -217,32 +247,60 @@ void Viewer::initShaders()
 		qDebug() << "Unable to find shader location for " << "projMatrix";
 
 
-	/*
+    /*
-	 * Adding Texture Shader
+     * Adding Texture Shader
-	 *
+     *
-	 */
+     */
-	textureRenderShaderprogram = new QOpenGLShaderProgram;
+    textureRenderShaderprogram = new QOpenGLShaderProgram;
-	if (!textureRenderShaderprogram->addShaderFromSourceFile(QOpenGLShader::Vertex, "src/shaders/textureShader.vert")) {
+    if (!textureRenderShaderprogram->addShaderFromSourceFile(QOpenGLShader::Vertex, "src/shaders/textureShader.vert")) {
-		cerr << "Unable to load Shader" << endl
+        cerr << "Unable to load Shader" << endl
-			 << "Log file:" << endl;
+             << "Log file:" << endl;
-		qDebug() << textureRenderShaderprogram->log();
+        qDebug() << textureRenderShaderprogram->log();
-	}
+    }
-	if (!textureRenderShaderprogram->addShaderFromSourceFile(QOpenGLShader::Fragment, "src/shaders/textureShader.frag")) {
+    if (!textureRenderShaderprogram->addShaderFromSourceFile(QOpenGLShader::Fragment, "src/shaders/textureShader.frag")) {
-		cerr << "Unable to load Shader" << endl
+        cerr << "Unable to load Shader" << endl
-			 << "Log file:" << endl;
+             << "Log file:" << endl;
-		qDebug() << textureRenderShaderprogram->log();
+        qDebug() << textureRenderShaderprogram->log();
-	}
+    }
 
-	textureRenderShaderprogram->link();
+    textureRenderShaderprogram->link();
 
-	if ((m_vPositionLocation = m_program->attributeLocation("vPosition")) < 0)
+    /*
-		qDebug() << "Unable to find shader location for " << "vPosition";
+     * Adding Skybox Shaders
+     *
+     */
+    skyboxRenderShaderProgram = new QOpenGLShaderProgram;
+    if (!skyboxRenderShaderProgram->addShaderFromSourceFile(QOpenGLShader::Vertex, "src/shaders/skyboxshader.vert")) {
+        cerr << "Unable to load Shader" << endl
+             << "Log file:" << endl;
+        qDebug() << skyboxRenderShaderProgram->log();
+    }
+    if (!skyboxRenderShaderProgram->addShaderFromSourceFile(QOpenGLShader::Fragment, "src/shaders/skyboxshader.frag")) {
+        cerr << "Unable to load Shader" << endl
+             << "Log file:" << endl;
+        qDebug() << skyboxRenderShaderProgram->log();
+    }
 
-	if ((m_mvMatrixLocation = m_program->uniformLocation("mvMatrix")) < 0)
+    skyboxRenderShaderProgram->link();
-		qDebug() << "Unable to find shader location for " << "mvMatrix";
 
-	if ((m_projMatrixLocation = m_program->uniformLocation("projMatrix")) < 0)
+    if ((s_texCoordsLocation = m_program->attributeLocation("texCoords")) < 0)
-		qDebug() << "Unable to find shader location for " << "projMatrix";
+        qDebug() << "Unable to find shader location for " << "vPosition";
+
+    if ((s_vPositionLocation = m_program->attributeLocation("vPosition")) < 0)
+        qDebug() << "Unable to find shader location for " << "vPosition";
+
+    if ((s_mvMatrixLocation = m_program->uniformLocation("mvMatrix")) < 0)
+        qDebug() << "Unable to find shader location for " << "mvMatrix";
+
+    if ((s_projMatrixLocation = m_program->uniformLocation("projMatrix")) < 0)
+        qDebug() << "Unable to find shader location for " << "projMatrix";
+
+    if ((s_skyboxCubemapLocation = m_program->uniformLocation("cubemap")) < 0)
+        qDebug() << "Unable to find shader location for " << "projMatrix";
+
+    s_texture = new QOpenGLTexture(QImage("../data/skybox.jpg").mirrored());
+    s_texture->setMinificationFilter(QOpenGLTexture::LinearMipMapLinear);
+    s_texture->setMagnificationFilter(QOpenGLTexture::Linear);
 }
 
 // Creates the basic shapes in memory. We only have 3, so we just prep them all in advance.

src/viewer/simpleViewer.h

@@ -26,6 +26,7 @@
 #include <QOpenGLFunctions_4_0_Core>
 #include <QOpenGLVertexArrayObject>
 #include <QOpenGLBuffer>
+#include <QOpenGLTexture>
 #include <QMatrix4x4>
 #include <QGLViewer/qglviewer.h>
 #include "../interfaces/visitor.h"
@@ -56,7 +57,8 @@ signals:
 	int shapeSelected(int);
 
 protected :
-	virtual void draw();
+    virtual void draw();
+    virtual void drawSkybox();
 	virtual void init();
 
 	virtual void mouseMoveEvent(QMouseEvent* e);
@@ -73,14 +75,24 @@ private:
 	Shape* pickGeom(int, int);
 
 	// shader switching variables and constants;
-	QOpenGLShaderProgram *colorPickerShaderProgram;
+    QOpenGLShaderProgram *colorPickerShaderProgram;
-	QOpenGLShaderProgram *textureRenderShaderprogram;
+    QOpenGLShaderProgram *textureRenderShaderprogram;
+    QOpenGLShaderProgram *skyboxRenderShaderProgram;
 	QOpenGLShaderProgram *m_program;
 	int m_vPositionLocation;
 	int m_colorLocation;
 	int m_projMatrixLocation;
 	int m_mvMatrixLocation;
 
+    int s_texCoordsLocation;
+    int s_vPositionLocation;
+    int s_mvMatrixLocation;
+    int s_colorLocation;
+    int s_projMatrixLocation;
+    int s_skyboxCubemapLocation;
+
+    QOpenGLTexture *s_texture;
+
 	SceneGroup* activeCell;
 	QColor* activeColor;
 	int activeShape;