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#include "shader/texture-blit-vert.h"
  33#include "shader/texture-blit-frag.h"
  34
  35struct ConsoleGLState {
  36    GLint texture_blit_prog;
  37    GLint texture_blit_vao;
  38};
  39
  40/* ---------------------------------------------------------------------- */
  41
  42ConsoleGLState *console_gl_init_context(void)
  43{
  44    ConsoleGLState *gls = g_new0(ConsoleGLState, 1);
  45
  46    gls->texture_blit_prog = qemu_gl_create_compile_link_program
  47        (texture_blit_vert_src, texture_blit_frag_src);
  48    if (!gls->texture_blit_prog) {
  49        exit(1);
  50    }
  51
  52    gls->texture_blit_vao =
  53        qemu_gl_init_texture_blit(gls->texture_blit_prog);
  54
  55    return gls;
  56}
  57
  58void console_gl_fini_context(ConsoleGLState *gls)
  59{
  60    if (!gls) {
  61        return;
  62    }
  63    g_free(gls);
  64}
  65
  66bool console_gl_check_format(DisplayChangeListener *dcl,
  67                             pixman_format_code_t format)
  68{
  69    switch (format) {
  70    case PIXMAN_BE_b8g8r8x8:
  71    case PIXMAN_BE_b8g8r8a8:
  72    case PIXMAN_r5g6b5:
  73        return true;
  74    default:
  75        return false;
  76    }
  77}
  78
  79void surface_gl_create_texture(ConsoleGLState *gls,
  80                               DisplaySurface *surface)
  81{
  82    assert(gls);
  83    assert(surface_stride(surface) % surface_bytes_per_pixel(surface) == 0);
  84
  85    switch (surface->format) {
  86    case PIXMAN_BE_b8g8r8x8:
  87    case PIXMAN_BE_b8g8r8a8:
  88        surface->glformat = GL_BGRA_EXT;
  89        surface->gltype = GL_UNSIGNED_BYTE;
  90        break;
  91    case PIXMAN_r5g6b5:
  92        surface->glformat = GL_RGB;
  93        surface->gltype = GL_UNSIGNED_SHORT_5_6_5;
  94        break;
  95    default:
  96        g_assert_not_reached();
  97    }
  98
  99    glGenTextures(1, &surface->texture);
 100    glEnable(GL_TEXTURE_2D);
 101    glBindTexture(GL_TEXTURE_2D, surface->texture);
 102    glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
 103                  surface_stride(surface) / surface_bytes_per_pixel(surface));
 104    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
 105                 surface_width(surface),
 106                 surface_height(surface),
 107                 0, surface->glformat, surface->gltype,
 108                 surface_data(surface));
 109
 110    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 111    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 112}
 113
 114void surface_gl_update_texture(ConsoleGLState *gls,
 115                               DisplaySurface *surface,
 116                               int x, int y, int w, int h)
 117{
 118    uint8_t *data = (void *)surface_data(surface);
 119
 120    assert(gls);
 121
 122    glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
 123                  surface_stride(surface) / surface_bytes_per_pixel(surface));
 124    glTexSubImage2D(GL_TEXTURE_2D, 0,
 125                    x, y, w, h,
 126                    surface->glformat, surface->gltype,
 127                    data + surface_stride(surface) * y
 128                    + surface_bytes_per_pixel(surface) * x);
 129}
 130
 131void surface_gl_render_texture(ConsoleGLState *gls,
 132                               DisplaySurface *surface)
 133{
 134    assert(gls);
 135
 136    glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
 137    glClear(GL_COLOR_BUFFER_BIT);
 138
 139    qemu_gl_run_texture_blit(gls->texture_blit_prog,
 140                             gls->texture_blit_vao);
 141}
 142
 143void surface_gl_destroy_texture(ConsoleGLState *gls,
 144                                DisplaySurface *surface)
 145{
 146    if (!surface || !surface->texture) {
 147        return;
 148    }
 149    glDeleteTextures(1, &surface->texture);
 150    surface->texture = 0;
 151}
 152
 153void surface_gl_setup_viewport(ConsoleGLState *gls,
 154                               DisplaySurface *surface,
 155                               int ww, int wh)
 156{
 157    int gw, gh, stripe;
 158    float sw, sh;
 159
 160    assert(gls);
 161
 162    gw = surface_width(surface);
 163    gh = surface_height(surface);
 164
 165    sw = (float)ww/gw;
 166    sh = (float)wh/gh;
 167    if (sw < sh) {
 168        stripe = wh - wh*sw/sh;
 169        glViewport(0, stripe / 2, ww, wh - stripe);
 170    } else {
 171        stripe = ww - ww*sh/sw;
 172        glViewport(stripe / 2, 0, ww - stripe, wh);
 173    }
 174}
 175