graphics fixes

* zooming without real FBOs kinda works, but with lower quality
* hardware detection for glGenerateMipmaps
* possibility to disable bilinear filtering, mipmaps, framebuffers, and realtime mipmap generation in g_graphics
* otclient works well using 3D acceleration in VirtualBox again
* many fixes regarding FBOs fallback implementation

src/framework/graphics/framebuffer.cpp

@@ -23,6 +23,7 @@
 #include "framebuffer.h"
 #include "graphics.h"
 #include "texture.h"
+#include <framework/platform/platformwindow.h>
 
 uint FrameBuffer::boundFbo = 0;
 std::vector<bool> auxBuffers;
@@ -42,14 +43,14 @@ FrameBuffer::FrameBuffer(const Size& size)
 
 void FrameBuffer::internalCreate()
 {
-    if(g_graphics.hasFBO()) {
+    if(g_graphics.canUseFBO()) {
         glGenFramebuffers(1, &m_fbo);
         if(!m_fbo)
             logFatal("Unable to create framebuffer object");
     } else { // use auxiliar buffers when FBOs are not supported
         m_fbo = 0;
         if(auxBuffers.size() == 0) {
-            int maxAuxs;
+            int maxAuxs = 0;
             glGetIntegerv(GL_AUX_BUFFERS, &maxAuxs);
             auxBuffers.resize(maxAuxs+1, false);
         }
@@ -57,16 +58,17 @@ void FrameBuffer::internalCreate()
             if(auxBuffers[i] == false) {
                 m_fbo = i;
                 auxBuffers[i] = true;
+                break;
             }
         }
         if(!m_fbo)
-            logFatal("There is no available auxiliar buffer for a new framebuffer");
+            logFatal("There is no available auxiliar buffer for a new framebuffer, total AUXs: ", auxBuffers.size()-1);
     }
 }
 
 FrameBuffer::~FrameBuffer()
 {
-    if(g_graphics.hasFBO()) {
+    if(g_graphics.canUseFBO()) {
         glDeleteFramebuffers(1, &m_fbo);
     } else {
         auxBuffers[m_fbo] = false;
@@ -84,7 +86,7 @@ void FrameBuffer::resize(const Size& size)
     m_texture = TexturePtr(new Texture(size.width(), size.height(), 4));
     m_texture->setSmooth(true);
 
-    if(g_graphics.hasFBO()) {
+    if(g_graphics.canUseFBO()) {
         internalBind();
         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture->getId(), 0);
 
@@ -121,11 +123,6 @@ void FrameBuffer::release()
     g_graphics.setViewportSize(m_oldViewportSize);
 }
 
-void FrameBuffer::generateMipmaps()
-{
-    m_texture->generateMipmaps();
-}
-
 void FrameBuffer::draw(const Rect& dest, const Rect& src)
 {
     g_painter.drawTexturedRect(dest, m_texture, src);
@@ -133,7 +130,10 @@ void FrameBuffer::draw(const Rect& dest, const Rect& src)
 
 void FrameBuffer::draw(const Rect& dest)
 {
-    g_painter.drawTexturedRect(dest, m_texture);
+    if(g_graphics.canUseFBO())
+        g_painter.drawTexturedRect(dest, m_texture);
+    else
+        g_painter.drawTexturedRect(dest, m_texture, Rect(0, 0, g_window.getSize()));
 }
 
 void FrameBuffer::internalBind()
@@ -142,7 +142,7 @@ void FrameBuffer::internalBind()
         return;
     assert(boundFbo != m_fbo);
 
-    if(g_graphics.hasFBO()) {
+    if(g_graphics.canUseFBO()) {
         glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
     } else {
         int buffer = GL_AUX0 + m_fbo - 1;
@@ -157,11 +157,13 @@ void FrameBuffer::internalBind()
 void FrameBuffer::internalRelease()
 {
     assert(boundFbo == m_fbo);
-    if(g_graphics.hasFBO()) {
+    if(g_graphics.canUseFBO()) {
         glBindFramebuffer(GL_FRAMEBUFFER, m_prevBoundFbo);
     } else {
         m_texture->bind();
-        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, m_texture->getWidth(), m_texture->getHeight());
+
+        Size size = getSize();
+        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, size.width(), size.height());
 
         int buffer = GL_BACK;
         if(m_prevBoundFbo != 0)
@@ -172,3 +174,14 @@ void FrameBuffer::internalRelease()
     }
     boundFbo = m_prevBoundFbo;
 }
+
+Size FrameBuffer::getSize()
+{
+    if(g_graphics.canUseFBO()) {
+        return m_texture->getSize();
+    } else {
+        // the buffer size is limited by the window size
+        return Size(std::min(m_texture->getWidth(), g_window.getWidth()),
+                    std::min(m_texture->getHeight(), g_window.getHeight()));
+    }
+}

src/framework/graphics/framebuffer.h

@@ -36,14 +36,13 @@ public:
     void resize(const Size& size);
     void bind(bool clear = true);
     void release();
-    void generateMipmaps();
     void draw(const Rect& dest);
     void draw(const Rect& dest, const Rect& src);
 
     void setClearColor(const Color& color) { m_clearColor = color; }
 
     TexturePtr getTexture() { return m_texture; }
-    const Size& getSize() { return m_texture->getSize(); }
+    Size getSize();
 
 private:
     void internalCreate();

src/framework/graphics/graphics.cpp

@@ -30,22 +30,35 @@ Graphics g_graphics;
 
 void Graphics::init()
 {
+    logInfo("GPU ", glGetString(GL_RENDERER));
+    logInfo("OpenGL ", glGetString(GL_VERSION));
+
 #ifndef OPENGL_ES2
     // init GL extensions
     GLenum err = glewInit();
     if(err != GLEW_OK)
         logFatal("Unable to init GLEW: ", glewGetErrorString(err));
+
     if(!GLEW_ARB_vertex_program || !GLEW_ARB_vertex_shader ||
        !GLEW_ARB_fragment_program || !GLEW_ARB_fragment_shader ||
        !GLEW_ARB_texture_non_power_of_two || !GLEW_ARB_multitexture)
         logFatal("Some OpenGL 2.0 extensions is not supported by your system graphics, please try updating your video drivers or buy a new hardware.");
+
+    m_useFBO = GLEW_ARB_framebuffer_object;
+    m_useBilinearFiltering = true;
+    m_generateMipmaps = true;
+    m_generateHardwareMipmaps = m_useFBO; // glGenerateMipmap is supported when FBO is
+    m_generateRealtimeMipmaps = m_generateHardwareMipmaps;
+#else
+    m_useFBO = true; // FBOs is always supported by mobile devices
+    m_useBilinearFiltering = true;
+    m_generateMipmaps = true;
+    m_generateHardwareMipmaps = true;
+    m_realtimeMipmapGeneration = false; // realtime mipmaps can be slow on mobile devices
 #endif
 
     glEnable(GL_BLEND);
 
-    logInfo("GPU ", glGetString(GL_RENDERER));
-    logInfo("OpenGL ", glGetString(GL_VERSION));
-
     m_emptyTexture = TexturePtr(new Texture);
 
     g_painter.init();
@@ -58,15 +71,6 @@ void Graphics::terminate()
     m_emptyTexture.reset();
 }
 
-bool Graphics::hasFBO()
-{
-#ifndef OPENGL_ES2
-    return GLEW_ARB_framebuffer_object;
-#else
-    return true;
-#endif
-}
-
 void Graphics::resize(const Size& size)
 {
     setViewportSize(size);

src/framework/graphics/graphics.h

@@ -32,7 +32,11 @@ public:
     void init();
     void terminate();
 
-    bool hasFBO();
+    bool canUseFBO() { return m_useFBO; }
+    bool canUseBilinearFiltering() { return m_useBilinearFiltering; }
+    bool canGenerateMipmaps() { return m_generateMipmaps; }
+    bool canGenerateHardwareMipmaps() { return m_generateHardwareMipmaps; }
+    bool canGenerateRealtimeMipmaps() { return m_generateRealtimeMipmaps; }
 
     void resize(const Size& size);
     void beginRender();
@@ -47,6 +51,12 @@ public:
 private:
     Size m_viewportSize;
     TexturePtr m_emptyTexture;
+
+    Boolean<false> m_useFBO;
+    Boolean<false> m_useBilinearFiltering;
+    Boolean<false> m_generateMipmaps;
+    Boolean<false> m_generateHardwareMipmaps;
+    Boolean<false> m_generateRealtimeMipmaps;
 };
 
 extern Graphics g_graphics;

src/framework/graphics/texture.cpp

@@ -99,6 +99,19 @@ uint Texture::internalLoadGLTexture(uchar *pixels, int channels, int width, int
 
 void Texture::generateMipmaps()
 {
+    if(g_graphics.canGenerateHardwareMipmaps())
+        generateHardwareMipmaps();
+    else {
+        // fallback to software mipmaps generation, this can be slow
+        generateSoftwareMipmaps(getPixels());
+    }
+}
+
+void Texture::generateHardwareMipmaps()
+{
+    if(!g_graphics.canGenerateHardwareMipmaps())
+        return;
+
     bind();
 
     if(!m_hasMipmaps) {
@@ -111,6 +124,9 @@ void Texture::generateMipmaps()
 
 void Texture::setSmooth(bool smooth)
 {
+    if(smooth && !g_graphics.canUseBilinearFiltering())
+        return;
+
     if(smooth == m_smooth)
         return;
 
@@ -140,7 +156,7 @@ std::vector<uint8> Texture::getPixels()
     return pixels;
 }
 
-void Texture::generateBilinearMipmaps(std::vector<uint8> inPixels)
+void Texture::generateSoftwareMipmaps(std::vector<uint8> inPixels)
 {
     bind();
 
@@ -155,6 +171,7 @@ void Texture::generateBilinearMipmaps(std::vector<uint8> inPixels)
 
     int mipmap = 1;
     while(true) {
+        // this is a simple bilinear filtering algorithm, it combines every 4 pixels in one pixel
         for(int x=0;x<outSize.width();++x) {
             for(int y=0;y<outSize.height();++y) {
                 uint8 *inPixel[4];
@@ -180,13 +197,13 @@ void Texture::generateBilinearMipmaps(std::vector<uint8> inPixels)
                     usedPixels++;
                 }
 
+                // try to guess the alpha pixel more accurately
                 for(int i=0;i<4;++i) {
                     if(usedPixels > 0)
                         outPixel[i] = pixelsSum[i] / usedPixels;
                     else
                         outPixel[i] = 0;
                 }
-
                 outPixel[3] = pixelsSum[3]/4;
             }
         }

src/framework/graphics/texture.h

@@ -34,11 +34,14 @@ public:
 
     void bind() { glBindTexture(GL_TEXTURE_2D, m_textureId); }
 
+    /// Tries to generate mipmaps via hardware, otherwise fallback to software implementation
     void generateMipmaps();
+    /// Generate mipmaps via hardware
+    void generateHardwareMipmaps();
+    /// Generate mipmaps via software, which has a special algorithm for combining alpha pixels
+    void generateSoftwareMipmaps(std::vector<uint8> inPixels);
 
-    // generate bilinear mipmaps optimized for alpha textures
+    /// Activate texture altialising
-    void generateBilinearMipmaps(std::vector<uint8> inPixels);
-
     void setSmooth(bool smooth);
     GLuint getId()  { return m_textureId; }
 

src/framework/platform/x11window.cpp

@@ -39,7 +39,7 @@ X11Window::X11Window()
     m_xic = 0;
     m_screen = 0;
     m_wmDelete = 0;
-    m_size = Size(16,16);
+    m_size = Size(600,480);
 
 #ifndef OPENGL_ES2
     m_glxContext = 0;
@@ -203,7 +203,6 @@ X11Window::X11Window()
 
 void X11Window::init()
 {
-    m_size = Size(200, 200);
     internalOpenDisplay();
     internalCheckGL();
     internalChooseGLVisual();

src/framework/ui/uiwidgetimage.cpp

@@ -24,6 +24,7 @@
 #include <framework/graphics/painter.h>
 #include <framework/graphics/texture.h>
 #include <framework/graphics/texturemanager.h>
+#include <framework/graphics/graphics.h>
 
 void UIWidget::initImage()
 {
@@ -167,7 +168,7 @@ void UIWidget::drawImage(const Rect& screenCoords)
     m_imageTexture->setSmooth(m_imageSmooth);
 
     // this will increase fps when rendering larger images, like the background, and improve image quality
-    if(m_imageSmooth && !m_imageTexture->hasMipmaps())
+    if(m_imageSmooth && g_graphics.canGenerateMipmaps() && !m_imageTexture->hasMipmaps())
         m_imageTexture->generateMipmaps();
 
     g_painter.setColor(m_imageColor);

src/framework/ui/uiwidgettext.cpp

@@ -57,7 +57,8 @@ void UIWidget::drawText(const Rect& screenCoords)
         m_textCachedScreenCoords = screenCoords;
 
         m_textCoordsBuffer.clear();
-        m_font->calculateDrawTextCoords(m_textCoordsBuffer, m_text, screenCoords, m_textAlign);
+
+        m_font->calculateDrawTextCoords(m_textCoordsBuffer, m_text, screenCoords.translated(m_textOffset), m_textAlign);
     }
 
     g_painter.setColor(m_color);

src/otclient/core/mapview.cpp

@@ -99,9 +99,13 @@ void MapView::draw(const Rect& rect)
                 }
             }
         }
-        m_framebuffer->generateMipmaps();
+
         m_framebuffer->release();
 
+        // generating mipmaps each frame can be slow in older cards
+        if(g_graphics.canGenerateRealtimeMipmaps())
+            m_framebuffer->getTexture()->generateHardwareMipmaps();
+
         m_mustDrawVisibleTilesCache = false;
     }
 
@@ -257,7 +261,7 @@ void MapView::updateVisibleTilesCache(int start)
         } else {
             static std::vector<Point> points;
             points.clear();
-            assert(m_drawDimension.width() % 2 == 0 && m_drawDimension.height() % 2 == 0);
+            //assert(m_drawDimension.width() % 2 == 0 && m_drawDimension.height() % 2 == 0);
             Point quadTopLeft(m_drawDimension.width()/2 - 1, m_drawDimension.height()/2 - 1);
             for(int step = 1; !(quadTopLeft.x < 0 && quadTopLeft.y < 0) && !stop; ++step) {
                 int quadWidth = std::min(2*step, m_drawDimension.width());
@@ -404,12 +408,14 @@ void MapView::setVisibleDimension(const Size& visibleDimension)
     int possiblesTileSizes[] = {32,16,8,4,2,1};
     int tileSize = 0;
     Size drawDimension = visibleDimension + Size(3,3);
+    Size framebufferSize = m_framebuffer->getSize();
     for(int candidateTileSize : possiblesTileSizes) {
         Size candidateDrawSize = drawDimension * candidateTileSize;
 
         // found a valid size
-        if(candidateDrawSize <= m_framebuffer->getSize()) {
+        if(candidateDrawSize.width() <= framebufferSize.width() && candidateDrawSize.height() <= framebufferSize.height()) {
             tileSize = candidateTileSize;
+            dump << candidateDrawSize << m_framebuffer->getSize() << tileSize;
             break;
         }
     }

src/otclient/core/spritemanager.cpp

@@ -134,7 +134,10 @@ TexturePtr SpriteManager::loadSpriteTexture(int id)
 
     TexturePtr spriteTex(new Texture(32, 32, 4, &pixels[0]));
     spriteTex->setSmooth(true);
-    spriteTex->generateBilinearMipmaps(pixels);
+
+    if(g_graphics.canGenerateMipmaps())
+        spriteTex->generateSoftwareMipmaps(pixels);
+
     return spriteTex;
 }