lxdream 0.9.1| filename | src/drivers/video_glx.c |
| changeset | 635:76c63aac3590 |
| prev | 606:23029426ab8f |
| next | 639:162ee7614b60 |
| author | nkeynes |
| date | Thu Feb 14 13:54:11 2008 +0000 (15 years ago) |
| branch | lxdream-render |
| permissions | -rw-r--r-- |
| last change | Commit render work in progress. Main changes: * Preliminary OSMesa support * Move the generic gl code out to pvr2/ * Implement scene data structure + reader * Remove the 1/z adjustments |
| view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * Shared functions for all X11-based display drivers.
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
19 #include <string.h>
20 #include "display.h"
21 #include <X11/Xlib.h>
22 #include <GL/glx.h>
23 #include "pvr2/pvr2.h"
24 #include "pvr2/glutil.h"
25 #include "drivers/video_glx.h"
26 #include "drivers/video_gl.h"
28 /**
29 * General X11 parameters. The front-end driver is expected to set this up
30 * by calling video_glx_init after initializing itself.
31 */
32 Display *video_x11_display = NULL;
33 Window video_x11_window = 0;
34 static gboolean glsl_loaded = FALSE;
36 static int glx_version = 100;
37 static XVisualInfo *glx_visual = NULL;
38 static GLXFBConfig glx_fbconfig;
39 static GLXContext glx_context = NULL;
40 static gboolean glx_is_initialized = FALSE;
41 static gboolean glx_fbconfig_supported = FALSE;
42 static gboolean glx_pbuffer_supported = FALSE;
43 static int glx_pbuffer_texture = 0;
45 /* Prototypes for pbuffer support methods */
46 static void glx_pbuffer_init( display_driver_t driver );
47 static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height );
48 static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer );
49 static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer );
50 static gboolean glx_pbuffer_display_render_buffer( render_buffer_t buffer );
51 static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer );
52 static gboolean glx_pbuffer_display_blank( uint32_t colour );
53 static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format );
55 /**
56 * Test if a specific extension is supported. From opengl.org
57 * @param extension extension name to check for
58 * @return TRUE if supported, otherwise FALSE.
59 */
60 gboolean isServerGLXExtensionSupported( Display *display, int screen,
61 const char *extension )
62 {
63 const char *extensions = NULL;
64 const char *start;
65 char *where, *terminator;
67 /* Extension names should not have spaces. */
68 where = strchr(extension, ' ');
69 if (where || *extension == '\0')
70 return 0;
71 extensions = glXQueryServerString(display, screen, GLX_EXTENSIONS);
72 start = extensions;
73 for (;;) {
74 where = strstr((const char *) start, extension);
75 if (!where)
76 break;
77 terminator = where + strlen(extension);
78 if (where == start || *(where - 1) == ' ')
79 if (*terminator == ' ' || *terminator == '\0')
80 return TRUE;
81 start = terminator;
82 }
83 return FALSE;
84 }
86 gboolean video_glx_init( Display *display, int screen )
87 {
88 int major, minor;
90 if( glx_is_initialized ) {
91 return TRUE;
92 }
94 Bool result = glXQueryVersion( display, &major, &minor );
95 if( result != False ) {
96 glx_version = (major*100) + minor;
97 }
99 glx_fbconfig_supported = (glx_version >= 103 ||
100 isServerGLXExtensionSupported(display, screen,
101 "GLX_SGIX_fbconfig") );
102 glx_pbuffer_supported = (glx_version >= 103 ||
103 isServerGLXExtensionSupported(display, screen,
104 "GLX_SGIX_pbuffer") );
106 if( glx_fbconfig_supported ) {
107 int nelem;
108 int fb_attribs[] = { GLX_DRAWABLE_TYPE,
109 GLX_PBUFFER_BIT|GLX_WINDOW_BIT,
110 GLX_RENDER_TYPE, GLX_RGBA_BIT,
111 GLX_DEPTH_SIZE, 24, 0 };
112 GLXFBConfig *configs = glXChooseFBConfig( display, screen,
113 fb_attribs, &nelem );
115 if( configs == NULL || nelem == 0 ) {
116 /* Didn't work. Fallback to 1.2 methods */
117 glx_fbconfig_supported = FALSE;
118 glx_pbuffer_supported = FALSE;
119 } else {
120 glx_fbconfig = configs[0];
121 glx_visual = glXGetVisualFromFBConfig(display, glx_fbconfig);
122 XFree(configs);
123 }
124 }
126 if( !glx_fbconfig_supported ) {
127 int attribs[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, 0 };
128 glx_visual = glXChooseVisual( display, screen, attribs );
129 }
131 if( glx_visual == NULL ) {
132 return FALSE;
133 }
135 glx_is_initialized = TRUE;
136 return TRUE;
137 }
139 gboolean video_glx_init_context( Display *display, Window window )
140 {
141 if( glx_fbconfig_supported ) {
142 glx_context = glXCreateNewContext( display, glx_fbconfig,
143 GLX_RGBA_TYPE, NULL, True );
144 if( glx_context == NULL ) {
145 ERROR( "Unable to create a GLX Context.");
146 return FALSE;
147 }
149 if( glXMakeContextCurrent( display, window, window,
150 glx_context ) == False ) {
151 ERROR( "Unable to prepare GLX context for drawing" );
152 glXDestroyContext( display, glx_context );
153 return FALSE;
154 }
155 } else {
156 glx_context = glXCreateContext( display, glx_visual, None, True );
157 if( glx_context == NULL ) {
158 ERROR( "Unable to create a GLX Context.");
159 return FALSE;
160 }
162 if( glXMakeCurrent( display, window, glx_context ) == False ) {
163 ERROR( "Unable to prepare GLX context for drawing" );
164 glXDestroyContext( display, glx_context );
165 return FALSE;
166 }
167 }
169 if( !glXIsDirect(display, glx_context) ) {
170 WARN( "Not using direct rendering - this is likely to be slow" );
171 }
173 if( glsl_is_supported() ) {
174 //if( !glsl_load_shaders( glsl_vertex_shader_src, glsl_fragment_shader_src ) ) {
175 if( !glsl_load_shaders( glsl_vertex_shader_src, NULL ) ) {
176 WARN( "Unable to load GL shaders" );
177 }
178 }
180 texcache_gl_init();
181 video_x11_display = display;
182 video_x11_window = window;
184 return TRUE;
185 }
187 gboolean video_glx_init_driver( display_driver_t driver )
188 {
189 if( gl_fbo_is_supported() ) { // First preference
190 gl_fbo_init(driver);
191 } else if( glx_pbuffer_supported ) {
192 glx_pbuffer_init(driver);
193 } else {
194 ERROR( "Unable to create render buffers (requires either EXT_framebuffer_object or GLX 1.3+)" );
195 video_glx_shutdown();
196 return FALSE;
197 }
198 return TRUE;
199 }
202 void video_glx_shutdown()
203 {
204 // texcache_gl_shutdown();
205 glx_is_initialized = FALSE;
206 if( glx_context != NULL ) {
207 glXDestroyContext( video_x11_display, glx_context );
208 glx_context = NULL;
209 }
210 if( glx_visual != NULL ) {
211 XFree(glx_visual);
212 glx_visual = NULL;
213 }
214 }
217 XVisualInfo *video_glx_get_visual()
218 {
219 return glx_visual;
220 }
223 int video_glx_load_font( const gchar *font_name )
224 {
225 int lists;
226 XFontStruct *font = XLoadQueryFont(video_x11_display, font_name );
227 if (font == NULL)
228 return -1;
230 lists = glGenLists(96);
231 glXUseXFont(font->fid, 32, 96, lists);
232 XFreeFont(video_x11_display, font);
233 return lists;
234 }
237 void video_glx_swap_buffers( void )
238 {
239 glXSwapBuffers( video_x11_display, video_x11_window );
240 }
242 void video_glx_make_window_current( void )
243 {
244 glXMakeCurrent( video_x11_display, video_x11_window, glx_context );
245 }
248 // Pbuffer support
250 /**
251 * Construct the initial frame buffers and allocate ids for everything.
252 * The render handling driver methods are set to the fbo versions.
253 */
254 static void glx_pbuffer_init( display_driver_t driver )
255 {
256 glGenTextures( 1, &glx_pbuffer_texture );
257 driver->create_render_buffer = glx_pbuffer_create_render_buffer;
258 driver->destroy_render_buffer = glx_pbuffer_destroy_render_buffer;
259 driver->set_render_target = glx_pbuffer_set_render_target;
260 driver->display_render_buffer = glx_pbuffer_display_render_buffer;
261 driver->load_frame_buffer = glx_pbuffer_load_frame_buffer;
262 driver->display_blank = glx_pbuffer_display_blank;
263 driver->read_render_buffer = glx_pbuffer_read_render_buffer;
264 }
266 void glx_pbuffer_shutdown()
267 {
268 glDeleteTextures( 1, &glx_pbuffer_texture );
269 }
271 static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height )
272 {
273 int attribs[] = { GLX_PBUFFER_WIDTH, width, GLX_PBUFFER_HEIGHT, height,
274 GLX_PRESERVED_CONTENTS, True, 0 };
275 GLXPbuffer pb = glXCreatePbuffer( video_x11_display, glx_fbconfig, attribs );
276 if( pb == (GLXPbuffer)NULL ) {
277 ERROR( "Unable to create pbuffer" );
278 return NULL;
279 }
280 render_buffer_t buffer = calloc( sizeof(struct render_buffer), 1 );
281 buffer->width = width;
282 buffer->height = height;
283 buffer->buf_id = pb;
284 return buffer;
285 }
287 static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer )
288 {
289 glXDestroyPbuffer( video_x11_display, (GLXPbuffer)buffer->buf_id );
290 buffer->buf_id = 0;
291 free( buffer );
292 }
294 static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer )
295 {
296 glFinish();
297 if( glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context ) == False ) {
298 ERROR( "Make context current (pbuffer) failed!" );
299 }
300 /* setup the gl context */
301 glViewport( 0, 0, buffer->width, buffer->height );
302 glDrawBuffer(GL_FRONT);
304 return TRUE;
305 }
307 /**
308 * Render the texture holding the given buffer to the front window
309 * buffer.
310 */
311 static gboolean glx_pbuffer_display_render_buffer( render_buffer_t buffer )
312 {
313 glFinish();
314 glReadBuffer( GL_FRONT );
315 glDrawBuffer( GL_FRONT );
316 glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
317 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, glx_pbuffer_texture );
318 glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, 0, 0, buffer->width, buffer->height, 0 );
319 video_glx_make_window_current();
320 gl_texture_window( buffer->width, buffer->height, glx_pbuffer_texture, buffer->inverted );
321 return TRUE;
322 }
324 static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
325 {
326 glFinish();
327 glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
328 GLenum type = colour_formats[frame->colour_format].type;
329 GLenum format = colour_formats[frame->colour_format].format;
330 int bpp = colour_formats[frame->colour_format].bpp;
331 int rowstride = (frame->rowstride / bpp) - frame->width;
333 gl_reset_state();
334 glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
335 glRasterPos2f(0.375, frame->height-0.375);
336 glPixelZoom( 1.0, 1.0 );
337 glDrawPixels( frame->width, frame->height, format, type, frame->data );
338 glFlush();
339 }
341 static gboolean glx_pbuffer_display_blank( uint32_t colour )
342 {
343 glFinish();
344 video_glx_make_window_current();
345 return gl_display_blank( colour );
346 }
348 static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer,
349 int rowstride, int format )
350 {
351 glXMakeCurrent( video_x11_display, (GLXDrawable)buffer->buf_id, glx_context );
352 glReadBuffer( GL_FRONT );
353 return gl_read_render_buffer( target, buffer, rowstride, format );
354 }
.