Shamusworld >> Repos - virtualjaguar/blob - src/gui/glwidget.cpp

   1 // OpenGL implementation in Qt
   2 // Parts of this are blantantly ripped off from BSNES (thanks Byuu!)
   3 //
   4 // by James L. Hammons
   5 // (C) 2010 Underground Software
   6 //
   7 // JLH = James L. Hammons <jlhamm@acm.org>
   8 //
   9 // Who  When        What
  10 // ---  ----------  -------------------------------------------------------------
  11 // JLH  01/14/2010  Created this file
  12 //
  13
  14 #include "glwidget.h"
  15
  16 #include "settings.h"
  17
  18 GLWidget::GLWidget(QWidget * parent/*= 0*/): QGLWidget(parent), texture(0),
  19         textureWidth(0), textureHeight(0), buffer(0), rasterWidth(64), rasterHeight(64)
  20 //      textureWidth(0), textureHeight(0), buffer(0), rasterWidth(256), rasterHeight(256)
  21 {
  22 }
  23
  24 GLWidget::~GLWidget()
  25 {
  26 }
  27
  28 void GLWidget::initializeGL()
  29 {
  30         format().setDoubleBuffer(true);
  31         resizeGL(rasterWidth, rasterHeight);
  32
  33         glDisable(GL_ALPHA_TEST);
  34         glDisable(GL_BLEND);
  35         glDisable(GL_DEPTH_TEST);
  36         glDisable(GL_POLYGON_SMOOTH);
  37         glDisable(GL_STENCIL_TEST);
  38         glEnable(GL_DITHER);
  39         glEnable(GL_TEXTURE_2D);
  40         glClearColor(0.0, 0.0, 0.0, 0.0);
  41 }
  42
  43 void GLWidget::paintGL()
  44 {
  45         unsigned outputWidth  = width();
  46         unsigned outputHeight = height();
  47
  48         glMatrixMode(GL_PROJECTION);
  49         glLoadIdentity();
  50         glOrtho(0, outputWidth, 0, outputHeight, -1.0, 1.0);
  51         glViewport(0, 0, outputWidth, outputHeight);
  52
  53         glMatrixMode(GL_MODELVIEW);
  54         glLoadIdentity();
  55
  56         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (smoothGLOutput ? GL_LINEAR : GL_NEAREST));
  57         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (smoothGLOutput ? GL_LINEAR : GL_NEAREST));
  58 //      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST /*GL_LINEAR*/);
  59 //      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST /*GL_LINEAR*/);
  60 //      glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rasterWidth, rasterHeight, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, buffer);
  61         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rasterWidth, rasterHeight, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, buffer);
  62
  63         double w = (double)rasterWidth  / (double)textureWidth;
  64         double h = (double)rasterHeight / (double)textureHeight;
  65         unsigned u = outputWidth;
  66         unsigned v = outputHeight;
  67
  68         glBegin(GL_TRIANGLE_STRIP);
  69         glTexCoord2f(0, 0); glVertex3i(0, v, 0);
  70         glTexCoord2f(w, 0); glVertex3i(u, v, 0);
  71         glTexCoord2f(0, h); glVertex3i(0, 0, 0);
  72         glTexCoord2f(w, h); glVertex3i(u, 0, 0);
  73         glEnd();
  74 }
  75
  76 void GLWidget::resizeGL(int width, int height)
  77 {
  78         if (width > textureWidth || height > textureHeight)
  79         {
  80 //              textureWidth  = max(width,  textureWidth);
  81 //              textureHeight = max(height, textureHeight);
  82 // Seems that power of 2 sizes are still mandatory...
  83                 textureWidth  = 1024;//(width > textureWidth ? width : textureWidth);
  84                 textureHeight = 512;//(height > textureHeight ? height : textureHeight);
  85 //              textureWidth  = (width > textureWidth ? width : textureWidth);
  86 //              textureHeight = (height > textureHeight ? height : textureHeight);
  87 #if 0
  88 printf("Resizing: new texture width/height = %i x %i\n", textureWidth, textureHeight);
  89 printf("Resizing: new raster width/height = %i x %i\n", rasterWidth, rasterHeight);
  90 #endif
  91
  92                 if (buffer)
  93                 {
  94                         delete[] buffer;
  95                         glDeleteTextures(1, &texture);
  96                 }
  97
  98                 buffer = new uint32_t[textureWidth * textureHeight];
  99                 glGenTextures(1, &texture);
 100                 glBindTexture(GL_TEXTURE_2D, texture);
 101                 glPixelStorei(GL_UNPACK_ROW_LENGTH, textureWidth);
 102                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 103                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 104 //              glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, textureWidth, textureHeight, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);
 105                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, textureWidth, textureHeight, 0, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, NULL);
 106         }
 107 }
 108
 109 #if 0
 110 class RubyGLWidget: public QGLWidget
 111 {
 112   public:
 113     GLuint texture;
 114     unsigned textureWidth, textureHeight;
 115
 116     uint32_t * buffer;
 117     unsigned rasterWidth, rasterHeight;
 118
 119     bool synchronize;
 120     unsigned filter;
 121
 122     void updateSynchronization() {
 123       #ifdef __APPLE__
 124       makeCurrent();
 125       CGLContextObj context = CGLGetCurrentContext();
 126       GLint value = synchronize;  //0 = draw immediately (no vsync), 1 = draw once per frame (vsync)
 127       CGLSetParameter(context, kCGLCPSwapInterval, &value);
 128       #endif
 129     }
 130 } * widget;
 131 #endif