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 "qemu-common.h"
  29#include "ui/console.h"
  30#include "ui/shader.h"
  31
  32/* ---------------------------------------------------------------------- */
  33
  34bool 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
  47void 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
  87void 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
 104void 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
 115void 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
 125void 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}
 147