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