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 "ui/console.h"
  29 #include "ui/shader.h"
  30
  31 /* ---------------------------------------------------------------------- */
  32
  33 bool console_gl_check_format(DisplayChangeListener *dcl,
  34                              pixman_format_code_t format)
  35 {
  36     switch (format) {
  37     case PIXMAN_BE_b8g8r8x8:
  38     case PIXMAN_BE_b8g8r8a8:
  39     case PIXMAN_r5g6b5:
  40         return true;
  41     default:
  42         return false;
  43     }
  44 }
  45
  46 void surface_gl_create_texture(QemuGLShader *gls,
  47                                DisplaySurface *surface)
  48 {
  49     assert(gls);
  50     assert(QEMU_IS_ALIGNED(surface_stride(surface), surface_bytes_per_pixel(surface)));
  51
  52     switch (surface->format) {
  53     case PIXMAN_BE_b8g8r8x8:
  54     case PIXMAN_BE_b8g8r8a8:
  55         surface->glformat = GL_BGRA_EXT;
  56         surface->gltype = GL_UNSIGNED_BYTE;
  57         break;
  58     case PIXMAN_BE_x8r8g8b8:
  59     case PIXMAN_BE_a8r8g8b8:
  60         surface->glformat = GL_RGBA;
  61         surface->gltype = GL_UNSIGNED_BYTE;
  62         break;
  63     case PIXMAN_r5g6b5:
  64         surface->glformat = GL_RGB;
  65         surface->gltype = GL_UNSIGNED_SHORT_5_6_5;
  66         break;
  67     default:
  68         g_assert_not_reached();
  69     }
  70
  71     glGenTextures(1, &surface->texture);
  72     glEnable(GL_TEXTURE_2D);
  73     glBindTexture(GL_TEXTURE_2D, surface->texture);
  74     glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
  75                   surface_stride(surface) / surface_bytes_per_pixel(surface));
  76     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
  77                  surface_width(surface),
  78                  surface_height(surface),
  79                  0, surface->glformat, surface->gltype,
  80                  surface_data(surface));
  81
  82     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  83     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  84 }
  85
  86 void surface_gl_update_texture(QemuGLShader *gls,
  87                                DisplaySurface *surface,
  88                                int x, int y, int w, int h)
  89 {
  90     uint8_t *data = (void *)surface_data(surface);
  91
  92     assert(gls);
  93
  94     if (surface->texture) {
  95         glBindTexture(GL_TEXTURE_2D, surface->texture);
  96         glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
  97                       surface_stride(surface)
  98                       / surface_bytes_per_pixel(surface));
  99         glTexSubImage2D(GL_TEXTURE_2D, 0,
 100                         x, y, w, h,
 101                         surface->glformat, surface->gltype,
 102                         data + surface_stride(surface) * y
 103                         + surface_bytes_per_pixel(surface) * x);
 104     }
 105 }
 106
 107 void surface_gl_render_texture(QemuGLShader *gls,
 108                                DisplaySurface *surface)
 109 {
 110     assert(gls);
 111
 112     glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
 113     glClear(GL_COLOR_BUFFER_BIT);
 114
 115     qemu_gl_run_texture_blit(gls, false);
 116 }
 117
 118 void surface_gl_destroy_texture(QemuGLShader *gls,
 119                                 DisplaySurface *surface)
 120 {
 121     if (!surface || !surface->texture) {
 122         return;
 123     }
 124     glDeleteTextures(1, &surface->texture);
 125     surface->texture = 0;
 126 }
 127
 128 void surface_gl_setup_viewport(QemuGLShader *gls,
 129                                DisplaySurface *surface,
 130                                int ww, int wh)
 131 {
 132     int gw, gh, stripe;
 133     float sw, sh;
 134
 135     assert(gls);
 136
 137     gw = surface_width(surface);
 138     gh = surface_height(surface);
 139
 140     sw = (float)ww/gw;
 141     sh = (float)wh/gh;
 142     if (sw < sh) {
 143         stripe = wh - wh*sw/sh;
 144         glViewport(0, stripe / 2, ww, wh - stripe);
 145     } else {
 146         stripe = ww - ww*sh/sw;
 147         glViewport(stripe / 2, 0, ww - stripe, wh);
 148     }
 149 }