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 Hammons
   5 // (C) 2010 Underground Software
   6 //
   7 // JLH = James Hammons <jlhamm@acm.org>
   8 //
   9 // Who  When        What
  10 // ---  ----------  -------------------------------------------------------------
  11 // JLH  01/14/2010  Created this file
  12 // JLH  02/03/2013  Added "centered" fullscreen mode with correct aspect ratio
  13 //
  14
  15 #include "glwidget.h"
  16
  17 #include "jaguar.h"
  18 #include "settings.h"
  19 #include "tom.h"
  20
  21 #ifdef __GCCWIN32__
  22 // Apparently on win32, various OpenGL constants aren't pulled in.
  23 #include <GL/glext.h>
  24 #endif
  25
  26
  27 GLWidget::GLWidget(QWidget * parent/*= 0*/): QGLWidget(parent), texture(0),
  28         textureWidth(0), textureHeight(0), buffer(0), rasterWidth(340), rasterHeight(240),
  29         offset(0)
  30 {
  31         // Screen pitch has to be the texture width (in 32-bit pixels)...
  32         JaguarSetScreenPitch(1024);
  33 }
  34
  35
  36 GLWidget::~GLWidget()
  37 {
  38         if (buffer)
  39                 delete[] buffer;
  40 }
  41
  42
  43 void GLWidget::initializeGL()
  44 {
  45         format().setDoubleBuffer(true);
  46         resizeGL(rasterWidth, rasterHeight);
  47
  48         glDisable(GL_ALPHA_TEST);
  49         glDisable(GL_BLEND);
  50         glDisable(GL_DEPTH_TEST);
  51         glDisable(GL_POLYGON_SMOOTH);
  52         glDisable(GL_STENCIL_TEST);
  53         glEnable(GL_DITHER);
  54         glEnable(GL_TEXTURE_2D);
  55         glClearColor(0.0, 0.0, 0.0, 0.0);
  56 }
  57
  58
  59 void GLWidget::paintGL()
  60 {
  61 //kludge
  62 rasterHeight = (vjs.hardwareTypeNTSC ? VIRTUAL_SCREEN_HEIGHT_NTSC : VIRTUAL_SCREEN_HEIGHT_PAL);
  63
  64         // If we're in fullscreen mode, we take the value of the screen width as
  65         // set by MainWin, since it may be wider than what our aspect ratio allows.
  66         // In that case, we adjust the viewport over so that it's centered on the
  67         // screen. Otherwise, we simply take the width from our width() funtion
  68         // which will always be correct in windowed mode.
  69
  70 //      unsigned outputWidth  = width();
  71         if (!fullscreen)
  72                 outputWidth = width();
  73
  74         unsigned outputHeight = height();
  75
  76         glMatrixMode(GL_PROJECTION);
  77         glLoadIdentity();
  78         glOrtho(0, outputWidth, 0, outputHeight, -1.0, 1.0);
  79 //      glViewport(0, 0, outputWidth, outputHeight);
  80         glViewport(0 + offset, 0, outputWidth, outputHeight);
  81
  82         glMatrixMode(GL_MODELVIEW);
  83         glLoadIdentity();
  84
  85         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (vjs.glFilter ? GL_LINEAR : GL_NEAREST));
  86         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (vjs.glFilter ? GL_LINEAR : GL_NEAREST));
  87 //      glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rasterWidth, rasterHeight, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, buffer);
  88 //more kludge
  89         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, TOMGetVideoModeWidth(), rasterHeight, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, buffer);
  90 //      glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rasterWidth, rasterHeight, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, buffer);
  91
  92         double w = (double)TOMGetVideoModeWidth()  / (double)textureWidth;
  93 //      double w = (double)rasterWidth  / (double)textureWidth;
  94         double h = (double)rasterHeight / (double)textureHeight;
  95         unsigned u = outputWidth;
  96         unsigned v = outputHeight;
  97
  98         glBegin(GL_TRIANGLE_STRIP);
  99 #if 1
 100         glTexCoord2f(0, 0); glVertex3i(0, v, 0);
 101         glTexCoord2f(w, 0); glVertex3i(u, v, 0);
 102         glTexCoord2f(0, h); glVertex3i(0, 0, 0);
 103         glTexCoord2f(w, h); glVertex3i(u, 0, 0);
 104 #else
 105         glTexCoord2f(0, 0); glVertex3i(0 + offset, v, 0);
 106         glTexCoord2f(w, 0); glVertex3i(u + offset, v, 0);
 107         glTexCoord2f(0, h); glVertex3i(0 + offset, 0, 0);
 108         glTexCoord2f(w, h); glVertex3i(u + offset, 0, 0);
 109 #endif
 110         glEnd();
 111 }
 112
 113
 114 void GLWidget::resizeGL(int width, int height)
 115 {
 116         if (width > textureWidth || height > textureHeight)
 117         {
 118                 // Seems that power of 2 sizes are still mandatory...
 119                 textureWidth  = 1024;
 120                 textureHeight = 512;
 121 #if 0
 122 printf("Resizing: new texture width/height = %i x %i\n", textureWidth, textureHeight);
 123 printf("Resizing: new raster width/height = %i x %i\n", rasterWidth, rasterHeight);
 124 #endif
 125
 126                 if (buffer)
 127                 {
 128                         delete[] buffer;
 129                         glDeleteTextures(1, &texture);
 130                 }
 131
 132                 buffer = new uint32_t[textureWidth * textureHeight];
 133                 JaguarSetScreenBuffer(buffer);
 134
 135 //???
 136 memset(buffer, 0xFF, textureWidth * textureHeight * sizeof(uint32_t));
 137                 glGenTextures(1, &texture);
 138                 glBindTexture(GL_TEXTURE_2D, texture);
 139                 glPixelStorei(GL_UNPACK_ROW_LENGTH, textureWidth);
 140                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 141                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 142                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, textureWidth, textureHeight, 0, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, NULL);
 143         }
 144 }
 145
 146
 147 #if 0
 148 class RubyGLWidget: public QGLWidget
 149 {
 150   public:
 151     GLuint texture;
 152     unsigned textureWidth, textureHeight;
 153
 154     uint32_t * buffer;
 155     unsigned rasterWidth, rasterHeight;
 156
 157     bool synchronize;
 158     unsigned filter;
 159
 160     void updateSynchronization() {
 161       #ifdef __APPLE__
 162       makeCurrent();
 163       CGLContextObj context = CGLGetCurrentContext();
 164       GLint value = synchronize;  //0 = draw immediately (no vsync), 1 = draw once per frame (vsync)
 165       CGLSetParameter(context, kCGLCPSwapInterval, &value);
 166       #endif
 167     }
 168 } * widget;
 169 #endif