ui/console-gl.c

   1 /*
   2  * QEMU graphical console -- opengl helper bits
   3  *
   4  * Copyright (c) 2014 Red Hat
   5  *
   6  * Authors:
   7  *    Gerd Hoffmann <kraxel@redhat.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27 #include "qemu/osdep.h"
  28 #include "qemu-common.h"
  29 #include "ui/console.h"
  30 #include "ui/shader.h"
  31
  32 /* ---------------------------------------------------------------------- */
  33
  34 bool console_gl_check_format(DisplayChangeListener *dcl,
  35                              pixman_format_code_t format)
  36 {
  37     switch (format) {
  38     case PIXMAN_BE_b8g8r8x8:
  39     case PIXMAN_BE_b8g8r8a8:
  40     case PIXMAN_r5g6b5:
  41         return true;
  42     default:
  43         return false;
  44     }
  45 }
  46
  47 void surface_gl_create_texture(QemuGLShader *gls,
  48                                DisplaySurface *surface)
  49 {
  50     assert(gls);
  51     assert(QEMU_IS_ALIGNED(surface_stride(surface), surface_bytes_per_pixel(surface)));
  52
  53     switch (surface->format) {
  54     case PIXMAN_BE_b8g8r8x8:
  55     case PIXMAN_BE_b8g8r8a8:
  56         surface->glformat = GL_BGRA_EXT;
  57         surface->gltype = GL_UNSIGNED_BYTE;
  58         break;
  59     case PIXMAN_BE_x8r8g8b8:
  60     case PIXMAN_BE_a8r8g8b8:
  61         surface->glformat = GL_RGBA;
  62         surface->gltype = GL_UNSIGNED_BYTE;
  63         break;
  64     case PIXMAN_r5g6b5:
  65         surface->glformat = GL_RGB;
  66         surface->gltype = GL_UNSIGNED_SHORT_5_6_5;
  67         break;
  68     default:
  69         g_assert_not_reached();
  70     }
  71
  72     glGenTextures(1, &surface->texture);
  73     glEnable(GL_TEXTURE_2D);
  74     glBindTexture(GL_TEXTURE_2D, surface->texture);
  75     glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
  76                   surface_stride(surface) / surface_bytes_per_pixel(surface));
  77     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
  78                  surface_width(surface),
  79                  surface_height(surface),
  80                  0, surface->glformat, surface->gltype,
  81                  surface_data(surface));
  82
  83     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  84     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  85 }
  86
  87 void surface_gl_update_texture(QemuGLShader *gls,
  88                                DisplaySurface *surface,
  89                                int x, int y, int w, int h)
  90 {
  91     uint8_t *data = (void *)surface_data(surface);
  92
  93     assert(gls);
  94
  95     glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
  96                   surface_stride(surface) / surface_bytes_per_pixel(surface));
  97     glTexSubImage2D(GL_TEXTURE_2D, 0,
  98                     x, y, w, h,
  99                     surface->glformat, surface->gltype,
 100                     data + surface_stride(surface) * y
 101                     + surface_bytes_per_pixel(surface) * x);
 102 }
 103
 104 void surface_gl_render_texture(QemuGLShader *gls,
 105                                DisplaySurface *surface)
 106 {
 107     assert(gls);
 108
 109     glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
 110     glClear(GL_COLOR_BUFFER_BIT);
 111
 112     qemu_gl_run_texture_blit(gls, false);
 113 }
 114
 115 void surface_gl_destroy_texture(QemuGLShader *gls,
 116                                 DisplaySurface *surface)
 117 {
 118     if (!surface || !surface->texture) {
 119         return;
 120     }
 121     glDeleteTextures(1, &surface->texture);
 122     surface->texture = 0;
 123 }
 124
 125 void surface_gl_setup_viewport(QemuGLShader *gls,
 126                                DisplaySurface *surface,
 127                                int ww, int wh)
 128 {
 129     int gw, gh, stripe;
 130     float sw, sh;
 131
 132     assert(gls);
 133
 134     gw = surface_width(surface);
 135     gh = surface_height(surface);
 136
 137     sw = (float)ww/gw;
 138     sh = (float)wh/gh;
 139     if (sw < sh) {
 140         stripe = wh - wh*sw/sh;
 141         glViewport(0, stripe / 2, ww, wh - stripe);
 142     } else {
 143         stripe = ww - ww*sh/sw;
 144         glViewport(stripe / 2, 0, ww - stripe, wh);
 145     }
 146 }