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-common.h"
  28 #include "ui/console.h"
  29 #include "ui/shader.h"
  30
  31 #include "shader/texture-blit-vert.h"
  32 #include "shader/texture-blit-frag.h"
  33
  34 struct ConsoleGLState {
  35     GLint texture_blit_prog;
  36 };
  37
  38 /* ---------------------------------------------------------------------- */
  39
  40 ConsoleGLState *console_gl_init_context(void)
  41 {
  42     ConsoleGLState *gls = g_new0(ConsoleGLState, 1);
  43
  44     gls->texture_blit_prog = qemu_gl_create_compile_link_program
  45         (texture_blit_vert_src, texture_blit_frag_src);
  46     if (!gls->texture_blit_prog) {
  47         exit(1);
  48     }
  49
  50     return gls;
  51 }
  52
  53 void console_gl_fini_context(ConsoleGLState *gls)
  54 {
  55     if (!gls) {
  56         return;
  57     }
  58     g_free(gls);
  59 }
  60
  61 bool console_gl_check_format(DisplayChangeListener *dcl,
  62                              pixman_format_code_t format)
  63 {
  64     switch (format) {
  65     case PIXMAN_BE_b8g8r8x8:
  66     case PIXMAN_BE_b8g8r8a8:
  67     case PIXMAN_r5g6b5:
  68         return true;
  69     default:
  70         return false;
  71     }
  72 }
  73
  74 void surface_gl_create_texture(ConsoleGLState *gls,
  75                                DisplaySurface *surface)
  76 {
  77     assert(gls);
  78     assert(surface_stride(surface) % surface_bytes_per_pixel(surface) == 0);
  79
  80     switch (surface->format) {
  81     case PIXMAN_BE_b8g8r8x8:
  82     case PIXMAN_BE_b8g8r8a8:
  83         surface->glformat = GL_BGRA_EXT;
  84         surface->gltype = GL_UNSIGNED_BYTE;
  85         break;
  86     case PIXMAN_r5g6b5:
  87         surface->glformat = GL_RGB;
  88         surface->gltype = GL_UNSIGNED_SHORT_5_6_5;
  89         break;
  90     default:
  91         g_assert_not_reached();
  92     }
  93
  94     glGenTextures(1, &surface->texture);
  95     glEnable(GL_TEXTURE_2D);
  96     glBindTexture(GL_TEXTURE_2D, surface->texture);
  97     glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
  98                   surface_stride(surface) / surface_bytes_per_pixel(surface));
  99     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
 100                  surface_width(surface),
 101                  surface_height(surface),
 102                  0, surface->glformat, surface->gltype,
 103                  surface_data(surface));
 104
 105     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 106     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 107 }
 108
 109 void surface_gl_update_texture(ConsoleGLState *gls,
 110                                DisplaySurface *surface,
 111                                int x, int y, int w, int h)
 112 {
 113     uint8_t *data = (void *)surface_data(surface);
 114
 115     assert(gls);
 116
 117     glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT,
 118                   surface_stride(surface) / surface_bytes_per_pixel(surface));
 119     glTexSubImage2D(GL_TEXTURE_2D, 0,
 120                     x, y, w, h,
 121                     surface->glformat, surface->gltype,
 122                     data + surface_stride(surface) * y
 123                     + surface_bytes_per_pixel(surface) * x);
 124 }
 125
 126 void surface_gl_render_texture(ConsoleGLState *gls,
 127                                DisplaySurface *surface)
 128 {
 129     assert(gls);
 130
 131     glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
 132     glClear(GL_COLOR_BUFFER_BIT);
 133
 134     qemu_gl_run_texture_blit(gls->texture_blit_prog);
 135 }
 136
 137 void surface_gl_destroy_texture(ConsoleGLState *gls,
 138                                 DisplaySurface *surface)
 139 {
 140     if (!surface || !surface->texture) {
 141         return;
 142     }
 143     glDeleteTextures(1, &surface->texture);
 144     surface->texture = 0;
 145 }
 146
 147 void surface_gl_setup_viewport(ConsoleGLState *gls,
 148                                DisplaySurface *surface,
 149                                int ww, int wh)
 150 {
 151     int gw, gh, stripe;
 152     float sw, sh;
 153
 154     assert(gls);
 155
 156     gw = surface_width(surface);
 157     gh = surface_height(surface);
 158
 159     sw = (float)ww/gw;
 160     sh = (float)wh/gh;
 161     if (sw < sh) {
 162         stripe = wh - wh*sw/sh;
 163         glViewport(0, stripe / 2, ww, wh - stripe);
 164     } else {
 165         stripe = ww - ww*sh/sw;
 166         glViewport(stripe / 2, 0, ww - stripe, wh);
 167     }
 168 }