FBO, game states

CMakeLists.txt

@@ -50,6 +50,8 @@ ENDIF(CMAKE_BUILD_TYPE STREQUAL "Debug")
 
 # find sources
 SET(SOURCES
+    src/menustate.cpp
+    src/framebuffer.cpp
     src/textureloader.cpp
     src/texture.cpp
     src/texturemanager.cpp

src/engine.cpp

@@ -29,13 +29,15 @@
 #include "input.h"
 #include "configmanager.h"
 #include "logger.h"
+#include "gamestate.h"
 
 Engine g_engine;
 
 Engine::Engine() :
     m_stopping(false),
     m_running(false),
-    m_lastFrameTicks(0)
+    m_lastFrameTicks(0),
+    m_currentState(NULL)
 {
 }
 
@@ -108,20 +110,32 @@ void Engine::stop()
     m_stopping = true;
 }
 
+void Engine::changeState(GameState* newState)
+{
+    if(m_currentState)
+        m_currentState->onLeave();
+    m_currentState = newState;
+    m_currentState->onEnter();
+}
+
 void Engine::render()
 {
     g_graphics.beginRender();
+    if(m_currentState)
+        m_currentState->render();
     g_graphics.endRender();
 }
 
 void Engine::update(int elapsedTicks)
 {
-
+    if(m_currentState)
+        m_currentState->update(elapsedTicks);
 }
 
 void Engine::onClose()
 {
-    stop();
+    if(m_currentState)
+        m_currentState->onClose();
 }
 
 void Engine::onResize(int width, int height)
@@ -131,5 +145,6 @@ void Engine::onResize(int width, int height)
 
 void Engine::onInputEvent(InputEvent *event)
 {
-
+    if(m_currentState)
+        m_currentState->onInputEvent(event);
 }

src/engine.h

@@ -27,6 +27,8 @@
 
 struct InputEvent;
 
+class GameState;
+
 class Engine
 {
 public:
@@ -38,8 +40,13 @@ public:
 
     /// Main loop
     void run();
+
+    /// Stops main loop
     void stop();
 
+    /// Change current game state
+    void changeState(GameState *newState);
+
     bool isRunning() const { return m_running; }
     bool isStopping() const { return m_stopping; }
 
@@ -60,6 +67,8 @@ private:
     bool m_running;
 
     unsigned long m_lastFrameTicks;
+
+    GameState *m_currentState;
 };
 
 extern Engine g_engine;

src/framebuffer.cpp

@@ -0,0 +1,120 @@
+/* The MIT License
+ *
+ * Copyright (c) 2010 OTClient, https://github.com/edubart/otclient
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#define GL_GLEXT_PROTOTYPES
+
+#include "framebuffer.h"
+
+#include <GL/glext.h>
+#include <GL/glu.h>
+#include "platform.h"
+#include "graphics.h"
+
+FrameBuffer::FrameBuffer(int width, int height) :
+    m_fbo(0)
+{
+    m_width = width;
+    m_height = height;
+
+    // texture where the framebuffer will be store
+    m_frameTexture = TexturePtr(new Texture(width, height, 4));
+
+    // we want a smooth framebuffer
+    m_frameTexture->enableBilinearFilter();
+
+    // use FBO only if supported
+    if(Platform::isExtensionSupported("EXT_framebuffer_object")) {
+        m_fallbackOldImp = false;
+
+        // generate FBO
+        glGenFramebuffersEXT(1, &m_fbo);
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
+
+        // attach 2D texture to this FBO
+        glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, m_frameTexture->getTextureId(), 0);
+
+        // must be called before checking
+        glDrawBuffer(GL_NONE);
+        glReadBuffer(GL_NONE);
+
+        GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+        switch(status) {
+            case GL_FRAMEBUFFER_COMPLETE_EXT:
+                //ok
+                break;
+            default:
+                m_fallbackOldImp = true;
+                break;
+        }
+    } else {
+        // otherwise fallback to copy texture from screen implementation
+        m_fallbackOldImp = true;
+    }
+}
+
+FrameBuffer::~FrameBuffer()
+{
+    if(m_fbo)
+        glDeleteFramebuffersEXT(1, &m_fbo);
+}
+
+void FrameBuffer::bind()
+{
+    if(!m_fallbackOldImp) {
+        // bind framebuffer
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
+
+        // must be called before rendering to framebuffer
+        glDrawBuffer(GL_NONE);
+        glReadBuffer(GL_NONE);
+    }
+
+    // clear framebuffer
+    glClearColor(0.0, 0.0, 0.0, 0.0);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    // setup framebuffer viewport
+    g_graphics.setViewport(m_width, m_height);
+}
+
+void FrameBuffer::unbind()
+{
+    if(!m_fallbackOldImp) {
+        // bind back buffer again
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+
+        // must be called to render to back buffer again
+        glDrawBuffer(GL_BACK);
+        glReadBuffer(GL_BACK);
+    } else {
+        // copy screen to texture
+        m_frameTexture->copyFromScreen(0, 0, 0, 0, m_width, m_height);
+
+        // clear screen
+        glClearColor(0.0, 0.0, 0.0, 0.0);
+        glClear(GL_COLOR_BUFFER_BIT);
+    }
+
+    // restore graphics viewport
+    g_graphics.restoreViewport();
+}

src/framebuffer.h

@@ -0,0 +1,52 @@
+/* The MIT License
+ *
+ * Copyright (c) 2010 OTClient, https://github.com/edubart/otclient
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+#ifndef FRAMEBUFFER_H
+#define FRAMEBUFFER_H
+
+#include "texture.h"
+
+class FrameBuffer
+{
+    FrameBuffer(int width, int height);
+    virtual ~FrameBuffer();
+
+    /// Return the texture where everything was drawn
+    TexturePtr getFramebufferTexture();
+
+    /// Bind the framebuffer, everything rendered will be draw on it
+    void bind();
+
+    /// Unbind the framebuffer, render on back buffer again
+    void unbind();
+
+private:
+    TexturePtr m_frameTexture;
+    GLuint m_fbo;
+    bool m_fallbackOldImp;
+    int m_width;
+    int m_height;
+};
+
+#endif // FRAMEBUFFER_H

src/gamestate.h

@@ -0,0 +1,46 @@
+/* The MIT License
+ *
+ * Copyright (c) 2010 OTClient, https://github.com/edubart/otclient
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+#ifndef GAMESTATE_H
+#define GAMESTATE_H
+
+struct InputEvent;
+
+class GameState
+{
+public:
+    GameState() { }
+    virtual ~GameState() { }
+
+    virtual void onEnter() = 0;
+    virtual void onLeave() = 0;
+
+    virtual void onClose() = 0;
+    virtual void onInputEvent(InputEvent *event) = 0;
+
+    virtual void render() = 0;
+    virtual void update(int elapsedTicks) = 0;
+};
+
+#endif // GAMESTATE_H

src/graphics.cpp

@@ -24,11 +24,9 @@
 
 #include "graphics.h"
 #include "logger.h"
-#include "texturemanager.h"
 
 #include <GL/gl.h>
 #include <GL/glu.h>
-#include "platform.h"
 
 Graphics g_graphics;
 
@@ -60,12 +58,19 @@ void Graphics::terminate()
 }
 
 void Graphics::resize(int width, int height)
+{
+    m_width = width;
+    m_height = height;
+    restoreViewport();
+}
+
+void Graphics::setViewport(int width, int height)
 {
     // resize gl viewport
     glViewport(0, 0, width, height);
 
     /*
-      0,0---------0,w
+     0 ,0---------0,w**
      |           |
      |           |
      |           |

src/graphics.h

@@ -34,14 +34,27 @@ public:
     void init();
     void terminate();
 
-    ///Called after every window resize
+    /// Called after every window resize
     void resize(int width, int height);
 
-    ///Called before every render
+    /// Called before every render
     void beginRender();
 
-    ///Called after every render
+    /// Called after every render
     void endRender();
+
+    /// Restore original viewport
+    void restoreViewport() { setViewport(m_width, m_height); }
+
+    /// Set viewport, used by FrameBuffer
+    void setViewport(int width, int height);
+
+    int getWidth() { return m_width; }
+    int getHeight() { return m_height; }
+
+private:
+    int m_width;
+    int m_height;
 };
 
 extern Graphics g_graphics;

src/main.cpp

@@ -28,9 +28,12 @@
 #include "configmanager.h"
 #include "resourcemanager.h"
 #include "platform.h"
+#include "menustate.h"
 
 #include <csignal>
 
+#include <boost/scoped_ptr.hpp>
+
 /// Catches signals so we can exit nicely
 void signal_handler(int sig)
 {
@@ -77,9 +80,17 @@ int main(int argc, const char *argv[])
 
     notice(APP_LONGNAME);
 
-    // setup the engine and run
+    // setup the engine
     g_engine.init();
+
+    // create initial state
+    boost::scoped_ptr<MenuState> menuState(new MenuState);
+    g_engine.changeState(menuState.get());
+
+    // run
     g_engine.run();
+
+    // terminate stuff
     g_engine.terminate();
 
     // save configurations before exiting

src/menustate.cpp

@@ -0,0 +1,67 @@
+/* The MIT License
+ *
+ * Copyright (c) 2010 OTClient, https://github.com/edubart/otclient
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+#include "menustate.h"
+#include "framebuffer.h"
+#include "graphics.h"
+#include "texturemanager.h"
+
+MenuState::MenuState()
+{
+}
+
+MenuState::~MenuState()
+{
+
+}
+
+void MenuState::onEnter()
+{
+
+}
+
+void MenuState::onLeave()
+{
+
+}
+
+void MenuState::onClose()
+{
+
+}
+
+void MenuState::onInputEvent(InputEvent* event)
+{
+
+}
+
+void MenuState::render()
+{
+
+}
+
+void MenuState::update(int elapsedTicks)
+{
+
+}

src/menustate.h

@@ -0,0 +1,47 @@
+/* The MIT License
+ *
+ * Copyright (c) 2010 OTClient, https://github.com/edubart/otclient
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+#ifndef MENUSTATE_H
+#define MENUSTATE_H
+
+#include "gamestate.h"
+
+class MenuState : public GameState
+{
+
+public:
+    MenuState();
+    virtual ~MenuState();
+
+    void onEnter();
+    void onLeave();
+
+    void onClose();
+    void onInputEvent(InputEvent *event);
+
+    void render();
+    void update(int elapsedTicks);
+};
+
+#endif // MENUSTATE_H

src/texture.cpp

@@ -27,14 +27,13 @@
 #include <GL/gl.h>
 #include <GL/glu.h>
 
-Texture::Texture(int width, int height, unsigned char *pixels, int components)
+Texture::Texture(int width, int height, int components, unsigned char *pixels)
 {
     m_width = width;
     m_height = height;
 
     glGenTextures(1, &m_textureId);
     glBindTexture(GL_TEXTURE_2D, m_textureId);
-    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 
     GLenum format = 0;
     switch(components) {
@@ -54,9 +53,6 @@ Texture::Texture(int width, int height, unsigned char *pixels, int components)
 
     glTexImage2D(GL_TEXTURE_2D, 0, components, width, height, 0, format, GL_UNSIGNED_BYTE, pixels);
 
-    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
-    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
-
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 
@@ -70,14 +66,21 @@ Texture::~Texture()
         glDeleteTextures(1, &m_textureId);
 }
 
-void Texture::enableBilinearFilter()
-{
-    glBindTexture(GL_TEXTURE_2D, m_textureId);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-}
-
 void Texture::bind()
 {
     glBindTexture(GL_TEXTURE_2D, m_textureId);
 }
+
+void Texture::enableBilinearFilter()
+{
+    bind();
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+}
+
+void Texture::copyFromScreen(int xoffset, int yoffset, int x, int y, int width, int height)
+{
+    bind();
+    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
+}
+

src/texture.h

@@ -33,7 +33,8 @@ class TextureManager;
 class Texture
 {
 public:
-    Texture(int width, int height, unsigned char *pixels, int components);
+    /// Create a texture, width and height must be a multiple of 2
+    Texture(int width, int height, int components, unsigned char *pixels = NULL);
     virtual ~Texture();
 
     /// Bind texture for drawing
@@ -42,8 +43,12 @@ public:
     /// Enable texture bilinear filter (smooth scaled textures)
     void enableBilinearFilter();
 
+    /// Copy screen pixels to texture
+    void copyFromScreen(int xoffset, int yoffset, int x, int y, int width, int height);
+
     int getWidth() const { return m_width; }
     int getHeight() const { return m_height; }
+    GLuint getTextureId() const { return m_textureId; }
 
 private:
     GLuint m_textureId;

src/textureloader.cpp

@@ -117,7 +117,7 @@ TexturePtr TextureLoader::loadPNG(const unsigned char *fileData, unsigned int fi
     fclose(pngFile);
     delete[] row_pointers;
 
-    texture = TexturePtr(new Texture(width, height, pixels, components));
+    texture = TexturePtr(new Texture(width, height, components, pixels));
 
     delete[] pixels;