LXR qemu/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
  33bool 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
  46void 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    if (surface->texture) {
  53        return;
  54    }
  55
  56    switch (surface->format) {
  57    case PIXMAN_BE_b8g8r8x8:
  58    case PIXMAN_BE_b8g8r8a8:
  59        surface->glformat = GL_BGRA_EXT;
  60        surface->gltype = GL_UNSIGNED_BYTE;
  61        break;
  62    case PIXMAN_BE_x8r8g8b8:
  63    case PIXMAN_BE_a8r8g8b8:
  64        surface->glformat = GL_RGBA;
  65        surface->gltype = GL_UNSIGNED_BYTE;
  66        break;
  67    case PIXMAN_r5g6b5:
  68        surface->glformat = GL_RGB;
  69        surface->gltype = GL_UNSIGNED_SHORT_5_6_5;
  70        break;
  71    default:
  72        g_assert_not_reached();
  73    }
  74
  75    glGenTextures(1, &surface->texture);
  76    glEnable(GL_TEXTURE_2D);
  77    glBindTexture(GL_TEXTURE_2D, surface->texture);
  78    glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
  79                  surface_stride(surface) / surface_bytes_per_pixel(surface));
  80    if (epoxy_is_desktop_gl()) {
  81        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
  82                     surface_width(surface),
  83                     surface_height(surface),
  84                     0, surface->glformat, surface->gltype,
  85                     surface_data(surface));
  86    } else {
  87        glTexImage2D(GL_TEXTURE_2D, 0, surface->glformat,
  88                     surface_width(surface),
  89                     surface_height(surface),
  90                     0, surface->glformat, surface->gltype,
  91                     surface_data(surface));
  92        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_A, GL_ONE);
  93    }
  94
  95    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  96    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  97}
  98
  99void surface_gl_update_texture(QemuGLShader *gls,
 100                               DisplaySurface *surface,
 101                               int x, int y, int w, int h)
 102{
 103    uint8_t *data = (void *)surface_data(surface);
 104
 105    assert(gls);
 106
 107    if (surface->texture) {
 108        glBindTexture(GL_TEXTURE_2D, surface->texture);
 109        glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
 110                      surface_stride(surface)
 111                      / surface_bytes_per_pixel(surface));
 112        glTexSubImage2D(GL_TEXTURE_2D, 0,
 113                        x, y, w, h,
 114                        surface->glformat, surface->gltype,
 115                        data + surface_stride(surface) * y
 116                        + surface_bytes_per_pixel(surface) * x);
 117    }
 118}
 119
 120void surface_gl_render_texture(QemuGLShader *gls,
 121                               DisplaySurface *surface)
 122{
 123    assert(gls);
 124
 125    glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
 126    glClear(GL_COLOR_BUFFER_BIT);
 127
 128    qemu_gl_run_texture_blit(gls, false);
 129}
 130
 131void surface_gl_destroy_texture(QemuGLShader *gls,
 132                                DisplaySurface *surface)
 133{
 134    if (!surface || !surface->texture) {
 135        return;
 136    }
 137    glDeleteTextures(1, &surface->texture);
 138    surface->texture = 0;
 139}
 140
 141void surface_gl_setup_viewport(QemuGLShader *gls,
 142                               DisplaySurface *surface,
 143                               int ww, int wh)
 144{
 145    int gw, gh, stripe;
 146    float sw, sh;
 147
 148    assert(gls);
 149
 150    gw = surface_width(surface);
 151    gh = surface_height(surface);
 152
 153    sw = (float)ww/gw;
 154    sh = (float)wh/gh;
 155    if (sw < sh) {
 156        stripe = wh - wh*sw/sh;
 157        glViewport(0, stripe / 2, ww, wh - stripe);
 158    } else {
 159        stripe = ww - ww*sh/sw;
 160        glViewport(stripe / 2, 0, ww - stripe, wh);
 161    }
 162}
 163