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 #include "tom.h"
  18 #include "video.h"
  19
  20 GLWidget::GLWidget(QWidget * parent/*= 0*/): QGLWidget(parent), texture(0),
  21         textureWidth(0), textureHeight(0), buffer(0), rasterWidth(320), rasterHeight(240)
  22 {
  23 //      tomDeviceWidth = rasterWidth;
  24         tomDeviceWidth = 1024;  // It has to be the texture width...
  25
  26         // Set up the backbuffer
  27         // To be safe, this should be 1280 * 625 * 2...
  28         backbuffer = (uint32_t *)malloc(1280 * 625 * sizeof(uint32_t));
  29 //      memset(backbuffer, 0x44, rasterWidth *
  30         memset(backbuffer, 0xFF, 1024 *
  31                 (vjs.hardwareTypeNTSC ? rasterHeight : VIRTUAL_SCREEN_HEIGHT_PAL)
  32                 * sizeof(uint32_t));
  33 }
  34
  35 GLWidget::~GLWidget()
  36 {
  37         free(backbuffer);
  38 }
  39
  40 void GLWidget::initializeGL()
  41 {
  42         format().setDoubleBuffer(true);
  43         resizeGL(rasterWidth, rasterHeight);
  44
  45         glDisable(GL_ALPHA_TEST);
  46         glDisable(GL_BLEND);
  47         glDisable(GL_DEPTH_TEST);
  48         glDisable(GL_POLYGON_SMOOTH);
  49         glDisable(GL_STENCIL_TEST);
  50         glEnable(GL_DITHER);
  51         glEnable(GL_TEXTURE_2D);
  52         glClearColor(0.0, 0.0, 0.0, 0.0);
  53 }
  54
  55 void GLWidget::paintGL()
  56 {
  57 //kludge
  58 rasterHeight = (vjs.hardwareTypeNTSC ? 240 : 256);
  59
  60         unsigned outputWidth  = width();
  61         unsigned outputHeight = height();
  62
  63         glMatrixMode(GL_PROJECTION);
  64         glLoadIdentity();
  65         glOrtho(0, outputWidth, 0, outputHeight, -1.0, 1.0);
  66         glViewport(0, 0, outputWidth, outputHeight);
  67
  68         glMatrixMode(GL_MODELVIEW);
  69         glLoadIdentity();
  70
  71         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (vjs.glFilter ? GL_LINEAR : GL_NEAREST));
  72         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (vjs.glFilter ? GL_LINEAR : GL_NEAREST));
  73 //      glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rasterWidth, rasterHeight, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, buffer);
  74 //more kludge
  75         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, TOMGetVideoModeWidth(), rasterHeight, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, buffer);
  76 //      glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rasterWidth, rasterHeight, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, buffer);
  77
  78         double w = (double)TOMGetVideoModeWidth()  / (double)textureWidth;
  79 //      double w = (double)rasterWidth  / (double)textureWidth;
  80         double h = (double)rasterHeight / (double)textureHeight;
  81         unsigned u = outputWidth;
  82         unsigned v = outputHeight;
  83
  84         glBegin(GL_TRIANGLE_STRIP);
  85         glTexCoord2f(0, 0); glVertex3i(0, v, 0);
  86         glTexCoord2f(w, 0); glVertex3i(u, v, 0);
  87         glTexCoord2f(0, h); glVertex3i(0, 0, 0);
  88         glTexCoord2f(w, h); glVertex3i(u, 0, 0);
  89         glEnd();
  90 }
  91
  92 void GLWidget::resizeGL(int width, int height)
  93 {
  94         if (width > textureWidth || height > textureHeight)
  95         {
  96 //              textureWidth  = max(width,  textureWidth);
  97 //              textureHeight = max(height, textureHeight);
  98 // Seems that power of 2 sizes are still mandatory...
  99                 textureWidth  = 1024;//(width > textureWidth ? width : textureWidth);
 100                 textureHeight = 512;//(height > textureHeight ? height : textureHeight);
 101 //              textureWidth  = (width > textureWidth ? width : textureWidth);
 102 //              textureHeight = (height > textureHeight ? height : textureHeight);
 103 #if 0
 104 printf("Resizing: new texture width/height = %i x %i\n", textureWidth, textureHeight);
 105 printf("Resizing: new raster width/height = %i x %i\n", rasterWidth, rasterHeight);
 106 #endif
 107
 108                 if (buffer)
 109                 {
 110                         delete[] buffer;
 111                         glDeleteTextures(1, &texture);
 112                 }
 113
 114                 buffer = new uint32_t[textureWidth * textureHeight];
 115                 glGenTextures(1, &texture);
 116                 glBindTexture(GL_TEXTURE_2D, texture);
 117                 glPixelStorei(GL_UNPACK_ROW_LENGTH, textureWidth);
 118                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 119                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 120 //              glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, textureWidth, textureHeight, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);
 121                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, textureWidth, textureHeight, 0, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, NULL);
 122         }
 123 }
 124
 125 #if 0
 126 class RubyGLWidget: public QGLWidget
 127 {
 128   public:
 129     GLuint texture;
 130     unsigned textureWidth, textureHeight;
 131
 132     uint32_t * buffer;
 133     unsigned rasterWidth, rasterHeight;
 134
 135     bool synchronize;
 136     unsigned filter;
 137
 138     void updateSynchronization() {
 139       #ifdef __APPLE__
 140       makeCurrent();
 141       CGLContextObj context = CGLGetCurrentContext();
 142       GLint value = synchronize;  //0 = draw immediately (no vsync), 1 = draw once per frame (vsync)
 143       CGLSetParameter(context, kCGLCPSwapInterval, &value);
 144       #endif
 145     }
 146 } * widget;
 147 #endif