Port examples/opengl/textures to OpenGL/ES 1.1

Reviewed-by: Sarah Smith

4 files changed, 51 insertions, 38 deletions

diff --git a/examples/opengl/opengl.pro b/examples/opengl/opengl.pro
index 567eb7b..b86e0ba 100644
--- a/examples/opengl/opengl.pro
+++ b/examples/opengl/opengl.pro
@@ -5,6 +5,9 @@ contains(QT_CONFIG, opengles1)|contains(QT_CONFIG, opengles1cl)|contains(QT_CONF
         SUBDIRS   = hellogl_es2
     } else {
         SUBDIRS   = hellogl_es
+        !contains(QT_CONFIG, opengles1cl) {
+            SUBDIRS += textures
+        }
     }
 } else {
     SUBDIRS   = 2dpainting \
diff --git a/examples/opengl/textures/glwidget.cpp b/examples/opengl/textures/glwidget.cpp
index cfb99b0..9c6d5ea 100644
--- a/examples/opengl/textures/glwidget.cpp
+++ b/examples/opengl/textures/glwidget.cpp
@@ -42,12 +42,17 @@
 #include <QtGui>
 #include <QtOpenGL>
 
-#include <math.h>
-
 #include "glwidget.h"
 
-GLuint GLWidget::sharedObject = 0;
-int GLWidget::refCount = 0;
+class CubeObject
+{
+public:
+    GLuint textures[6];
+    QVector<QVector3D> vertices;
+    QVector<QVector2D> texCoords;
+
+    void draw();
+};
 
 GLWidget::GLWidget(QWidget *parent, QGLWidget *shareWidget)
     : QGLWidget(parent, shareWidget)
@@ -56,14 +61,12 @@ GLWidget::GLWidget(QWidget *parent, QGLWidget *shareWidget)
     xRot = 0;
     yRot = 0;
     zRot = 0;
+    cube = 0;
 }
 
 GLWidget::~GLWidget()
 {
-    if (--refCount == 0) {
-        makeCurrent();
-        glDeleteLists(sharedObject, 1);
-    }
+    delete cube;
 }
 
 QSize GLWidget::minimumSizeHint() const
@@ -92,9 +95,7 @@ void GLWidget::setClearColor(const QColor &color)
 
 void GLWidget::initializeGL()
 {
-    if (!sharedObject)
-        sharedObject = makeObject();
-    ++refCount;
+    makeObject();
 
     glEnable(GL_DEPTH_TEST);
     glEnable(GL_CULL_FACE);
@@ -106,11 +107,11 @@ void GLWidget::paintGL()
     qglClearColor(clearColor);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glLoadIdentity();
-    glTranslated(0.0, 0.0, -10.0);
-    glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
-    glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
-    glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
-    glCallList(sharedObject);
+    glTranslatef(0.0f, 0.0f, -10.0f);
+    glRotatef(xRot / 16.0f, 1.0f, 0.0f, 0.0f);
+    glRotatef(yRot / 16.0f, 0.0f, 1.0f, 0.0f);
+    glRotatef(zRot / 16.0f, 0.0f, 0.0f, 1.0f);
+    cube->draw();
 }
 
 void GLWidget::resizeGL(int width, int height)
@@ -120,7 +121,11 @@ void GLWidget::resizeGL(int width, int height)
 
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
+#ifndef QT_OPENGL_ES
     glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
+#else
+    glOrthof(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
+#endif
     glMatrixMode(GL_MODELVIEW);
 }
 
@@ -147,7 +152,7 @@ void GLWidget::mouseReleaseEvent(QMouseEvent * /* event */)
     emit clicked();
 }
 
-GLuint GLWidget::makeObject()
+void GLWidget::makeObject()
 {
     static const int coords[6][4][3] = {
         { { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } },
@@ -158,25 +163,32 @@ GLuint GLWidget::makeObject()
         { { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } }
     };
 
+    cube = new CubeObject();
 
-    GLuint textures[6];
-    for (int j=0; j < 6; ++j)
-        textures[j] = bindTexture(QPixmap(QString(":/images/side%1.png").arg(j + 1)),
-                                  GL_TEXTURE_2D);
+    for (int j=0; j < 6; ++j) {
+        cube->textures[j] = bindTexture
+            (QPixmap(QString(":/images/side%1.png").arg(j + 1)), GL_TEXTURE_2D);
+    }
 
-    GLuint list = glGenLists(1);
-    glNewList(list, GL_COMPILE);
     for (int i = 0; i < 6; ++i) {
-        glBindTexture(GL_TEXTURE_2D, textures[i]);
-        glBegin(GL_QUADS);
         for (int j = 0; j < 4; ++j) {
-            glTexCoord2d(j == 0 || j == 3, j == 0 || j == 1);
-            glVertex3d(0.2 * coords[i][j][0], 0.2 * coords[i][j][1],
-                       0.2 * coords[i][j][2]);
+            cube->texCoords.append
+                (QVector2D(j == 0 || j == 3, j == 0 || j == 1));
+            cube->vertices.append
+                (QVector3D(0.2 * coords[i][j][0], 0.2 * coords[i][j][1],
+                           0.2 * coords[i][j][2]));
         }
-        glEnd();
     }
+}
 
-    glEndList();
-    return list;
+void CubeObject::draw()
+{
+    glVertexPointer(3, GL_FLOAT, 0, vertices.constData());
+    glTexCoordPointer(2, GL_FLOAT, 0, texCoords.constData());
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    for (int i = 0; i < 6; ++i) {
+        glBindTexture(GL_TEXTURE_2D, textures[i]);
+        glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4);
+    }
 }
diff --git a/examples/opengl/textures/glwidget.h b/examples/opengl/textures/glwidget.h
index 68be8bc..f793d6d 100644
--- a/examples/opengl/textures/glwidget.h
+++ b/examples/opengl/textures/glwidget.h
@@ -44,6 +44,8 @@
 
 #include <QGLWidget>
 
+class CubeObject;
+
 class GLWidget : public QGLWidget
 {
     Q_OBJECT
@@ -69,16 +71,14 @@ protected:
     void mouseReleaseEvent(QMouseEvent *event);
 
 private:
-    GLuint makeObject();
+    void makeObject();
 
     QColor clearColor;
     QPoint lastPos;
     int xRot;
     int yRot;
     int zRot;
-
-    static GLuint sharedObject;
-    static int refCount;
+    CubeObject *cube;
 };
 
 #endif
diff --git a/examples/opengl/textures/window.cpp b/examples/opengl/textures/window.cpp
index ea64512..9bd7931 100644
--- a/examples/opengl/textures/window.cpp
+++ b/examples/opengl/textures/window.cpp
@@ -48,8 +48,6 @@ Window::Window()
 {
     QGridLayout *mainLayout = new QGridLayout;
 
-    glWidgets[0][0] = 0;
-
     for (int i = 0; i < NumRows; ++i) {
         for (int j = 0; j < NumColumns; ++j) {
             QColor clearColor;
@@ -57,7 +55,7 @@ Window::Window()
                               / (NumRows * NumColumns - 1),
                               255, 63);
 
-            glWidgets[i][j] = new GLWidget(0, glWidgets[0][0]);
+            glWidgets[i][j] = new GLWidget(0, 0);
             glWidgets[i][j]->setClearColor(clearColor);
             glWidgets[i][j]->rotateBy(+42 * 16, +42 * 16, -21 * 16);
             mainLayout->addWidget(glWidgets[i][j], i, j);