Added Triangle example.

CMakeLists.txt

@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 2.6)
 project(Magnum)
 
+option(BUILD_EXAMPLES "Build examples (requires GLUT)." OFF)
 option(BUILD_TESTS "Build unit tests (requires Qt4)." OFF)
 
 if(BUILD_TESTS)
@@ -16,7 +17,20 @@ if(BUILD_TESTS)
 endif()
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${Magnum_SOURCE_DIR}/modules/")
-
 include(MagnumMacros)
 
 add_subdirectory(src)
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src)
+
+if(BUILD_EXAMPLES)
+    find_package(GLUT)
+
+    if(NOT GLUT_FOUND)
+        message(WARNING "GLUT is required for building examples. No examples will be build.")
+        set(BUILD_EXAMPLES OFF)
+    else()
+        add_subdirectory(examples)
+    endif()
+
+endif()

examples/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(triangle)

examples/triangle/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_executable(triangleExample main.cpp IdentityShader.cpp Triangle.cpp)
+target_link_libraries(triangleExample Magnum ${GLUT_LIBRARY})

examples/triangle/IdentityShader.cpp

@@ -0,0 +1,36 @@
+/*
+    Copyright © 2010 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License version 3 for more details.
+*/
+
+#include "IdentityShader.h"
+
+namespace Magnum { namespace Examples {
+
+IdentityShader::IdentityShader() {
+    Shader* vertexShader = Shader::fromFile(Shader::Vertex, "identity.vert");
+    Shader* fragmentShader = Shader::fromFile(Shader::Fragment, "identity.frag");
+
+    loadShader(vertexShader);
+    loadShader(fragmentShader);
+
+    bindAttribute(Vertex, "vertex");
+    bindAttribute(Color, "color");
+
+    link();
+
+    delete vertexShader;
+    delete fragmentShader;
+}
+
+}}

examples/triangle/IdentityShader.h

@@ -0,0 +1,34 @@
+#ifndef Magnum_Examples_IdentityShader_h
+#define Magnum_Examples_IdentityShader_h
+/*
+    Copyright © 2010 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License version 3 for more details.
+*/
+
+#include "AbstractShaderProgram.h"
+
+namespace Magnum { namespace Examples {
+
+class IdentityShader: public AbstractShaderProgram {
+    public:
+        enum Attributes {
+            Vertex = 1,
+            Color = 2
+        };
+
+        IdentityShader();
+};
+
+}}
+
+#endif

examples/triangle/Triangle.cpp

@@ -0,0 +1,44 @@
+/*
+    Copyright © 2010 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License version 3 for more details.
+*/
+
+#include "Triangle.h"
+
+#include "Buffer.h"
+
+namespace Magnum { namespace Examples {
+
+Triangle::Triangle(AbstractObject* parent): AbstractObject(parent), mesh(Mesh::Triangles, 3) {
+    /* Vertices and colors, interleaved */
+    Vector4 data[] = {
+        Vector4(-0.5f, -0.5f, 0.0f),    Vector4(1.0f, 0.0f, 0.0f),  /* Red lower left vertex */
+        Vector4(0.5f, -0.5f, 0.0f),     Vector4(0.0f, 1.0f, 0.0f),  /* Green lower right vertex */
+        Vector4(0.0f, 0.5f, 0.0f),      Vector4(0.0f, 0.0f, 1.0f)   /* Blue top vertex */
+    };
+
+    /* Fill the mesh with data */
+    Buffer* buffer = mesh.addBuffer(true);
+    buffer->setData(sizeof(data), data, Buffer::DrawStatic);
+
+    /* Bind attributes (first vertex data, then color data) */
+    mesh.bindAttribute<Vector4>(buffer, IdentityShader::Vertex);
+    mesh.bindAttribute<Vector4>(buffer, IdentityShader::Color);
+}
+
+void Triangle::draw(const Matrix4& transformationMatrix, const Matrix4& projectionMatrix) {
+    shader.use();
+    mesh.draw();
+}
+
+}}

examples/triangle/Triangle.h

@@ -0,0 +1,37 @@
+#ifndef Magnum_Examples_Triangle_h
+#define Magnum_Examples_Triangle_h
+/*
+    Copyright © 2010 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License version 3 for more details.
+*/
+
+#include "AbstractObject.h"
+#include "Mesh.h"
+#include "IdentityShader.h"
+
+namespace Magnum { namespace Examples {
+
+class Triangle: public AbstractObject {
+    public:
+        Triangle(AbstractObject* parent = 0);
+
+        virtual void draw(const Matrix4& transformationMatrix, const Matrix4& projectionMatrix);
+
+    private:
+        Mesh mesh;
+        IdentityShader shader;
+};
+
+}}
+
+#endif

examples/triangle/identity.frag

@@ -0,0 +1,9 @@
+#version 330
+
+in vec4 varyingColor;
+
+out vec4 fragmentColor;
+
+void main() {
+    fragmentColor = varyingColor;
+}

examples/triangle/identity.vert

@@ -0,0 +1,12 @@
+#version 330
+
+in vec4 vertex;
+in vec4 color;
+
+out vec4 varyingColor;
+
+void main() {
+    varyingColor = color;
+
+    gl_Position = vertex;
+}

examples/triangle/main.cpp

@@ -0,0 +1,63 @@
+/*
+    Copyright © 2010 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License version 3 for more details.
+*/
+
+#include <iostream>
+#include <GL/glew.h>
+#include <GL/freeglut.h>
+
+#include "Scene.h"
+#include "Triangle.h"
+
+Magnum::Scene* s;
+
+/* Wrapper functions so GLUT can handle that */
+void setViewport(int w, int h) {
+    s->setViewport(w, h);
+}
+void draw() {
+    s->draw();
+    glutSwapBuffers();
+}
+
+int main(int argc, char** argv) {
+    /* Init GLUT */
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH|GLUT_STENCIL);
+    glutInitWindowSize(800, 600);
+    glutCreateWindow("Shaded Triangle example");
+    glutReshapeFunc(setViewport);
+    glutDisplayFunc(draw);
+
+    /* Init GLEW */
+    GLenum err = glewInit();
+    if(err != GLEW_OK) {
+        std::cerr << "GLEW error:" << glewGetErrorString(err) << std::endl;
+        return 1;
+    }
+
+    /* Initialize scene */
+    Magnum::Scene scene;
+    s = &scene;
+
+    /* Every scene needs a camera */
+    scene.setCamera(new Magnum::Camera(&scene));
+
+    /* Add triangle to the scene */
+    new Magnum::Examples::Triangle(&scene);
+
+    /* Main loop calls draw() periodically and setViewport() on window size change */
+    glutMainLoop();
+    return 0;
+}