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
  35 struct ConsoleGLState {
  36     GLint texture_blit_prog;
  37     GLint texture_blit_vao;
  38 };
  39
  40 /* ---------------------------------------------------------------------- */
  41
  42 ConsoleGLState *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
  58 void console_gl_fini_context(ConsoleGLState *gls)
  59 {
  60     if (!gls) {
  61         return;
  62     }
  63     g_free(gls);
  64 }
  65
  66 bool 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
  79 void 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
 114 void 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
 131 void 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
 143 void 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
 153 void 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 }