filename | src/drivers/gl_common.c |
changeset | 586:2a3ba82cf243 |
prev | 545:fdcdcd8b9fd1 |
author | bhaal22 |
date | Tue Feb 26 01:10:48 2008 +0000 (16 years ago) |
permissions | -rw-r--r-- |
last change | Commit initial ALSA audio driver Add init/shutdown stubs to audio driver structure |
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1 /**
2 * $Id$
3 *
4 * Common GL code that doesn't depend on a specific implementation
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 <sys/time.h>
21 #include "display.h"
22 #include "pvr2/pvr2.h"
23 #include "drivers/gl_common.h"
25 extern uint32_t video_width, video_height;
27 char *required_extensions[] = { "GL_EXT_framebuffer_object", NULL };
29 /**
30 * Test if a specific extension is supported. From opengl.org
31 * @param extension extension name to check for
32 * @return TRUE if supported, otherwise FALSE.
33 */
34 gboolean isGLExtensionSupported( const char *extension )
35 {
36 const GLubyte *extensions = NULL;
37 const GLubyte *start;
38 GLubyte *where, *terminator;
40 /* Extension names should not have spaces. */
41 where = (GLubyte *) strchr(extension, ' ');
42 if (where || *extension == '\0')
43 return 0;
44 extensions = glGetString(GL_EXTENSIONS);
45 /* It takes a bit of care to be fool-proof about parsing the
46 OpenGL extensions string. Don't be fooled by sub-strings,
47 etc. */
48 start = extensions;
49 for (;;) {
50 where = (GLubyte *) strstr((const char *) start, extension);
51 if (!where)
52 break;
53 terminator = where + strlen(extension);
54 if (where == start || *(where - 1) == ' ')
55 if (*terminator == ' ' || *terminator == '\0')
56 return TRUE;
57 start = terminator;
58 }
59 return FALSE;
60 }
62 gboolean hasRequiredGLExtensions( )
63 {
64 int i;
65 gboolean isOK = TRUE;
67 for( i=0; required_extensions[i] != NULL; i++ ) {
68 if( !isGLExtensionSupported(required_extensions[i]) ) {
69 ERROR( "Required OpenGL extension not supported: %s", required_extensions[i] );
70 isOK = FALSE;
71 }
72 }
73 return isOK;
74 }
76 /**
77 * Reset the gl state to simple orthographic projection with
78 * texturing, alpha/depth/scissor/cull tests disabled.
79 */
80 void gl_reset_state()
81 {
82 glViewport( 0, 0, video_width, video_height );
83 glMatrixMode(GL_PROJECTION);
84 glLoadIdentity();
85 glOrtho( 0, video_width, video_height, 0, 0, -65535 );
86 glMatrixMode(GL_MODELVIEW);
87 glLoadIdentity();
88 glDisable( GL_TEXTURE_2D );
89 glDisable( GL_ALPHA_TEST );
90 glDisable( GL_DEPTH_TEST );
91 glDisable( GL_SCISSOR_TEST );
92 glDisable( GL_CULL_FACE );
93 glDrawBuffer( GL_FRONT );
94 }
96 void gl_display_render_buffer( render_buffer_t buffer )
97 {
98 gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
99 }
101 void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
102 {
103 float top, bottom;
104 if( inverted ) {
105 top = ((float)height);
106 bottom = 0;
107 } else {
108 top = 0;
109 bottom = ((float)height);
110 }
112 /* Reset display parameters */
113 gl_reset_state();
114 glColor3f( 0,0,0 );
116 int x1=0,y1=0,x2=video_width,y2=video_height;
118 int ah = video_width * 0.75;
120 if( ah > video_height ) {
121 int w = (video_height/0.75);
122 x1 = (video_width - w)/2;
123 x2 -= x1;
125 glBegin( GL_QUADS );
126 glVertex2f( 0, 0 );
127 glVertex2f( x1, 0 );
128 glVertex2f( x1, video_height );
129 glVertex2f( 0, video_height);
130 glVertex2f( x2, 0 );
131 glVertex2f( video_width, 0 );
132 glVertex2f( video_width, video_height );
133 glVertex2f( x2, video_height);
134 glEnd();
135 } else if( ah < video_height ) {
136 y1 = (video_height - ah)/2;
137 y2 -= y1;
138 glBegin( GL_QUADS );
139 glVertex2f( 0, 0 );
140 glVertex2f( video_width, 0 );
141 glVertex2f( video_width, y1 );
142 glVertex2f( 0, y1 );
143 glVertex2f( 0, y2 );
144 glVertex2f( video_width, y2 );
145 glVertex2f( video_width, video_height );
146 glVertex2f( 0, video_height );
147 glEnd();
148 }
150 /* Render the textured rectangle */
151 glEnable( GL_TEXTURE_RECTANGLE_ARB );
152 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
153 glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
154 glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
155 glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
156 glEnable( GL_BLEND );
157 glBlendFunc( GL_ONE, GL_ZERO );
158 glBegin( GL_QUADS );
159 glTexCoord2f( 0, top );
160 glVertex2f( x1, y1 );
161 glTexCoord2f( ((float)width), top );
162 glVertex2f( x2, y1 );
163 glTexCoord2f( ((float)width), bottom );
164 glVertex2f( x2, y2 );
165 glTexCoord2f( 0, bottom );
166 glVertex2f( x1, y2 );
167 glEnd();
168 glDisable( GL_TEXTURE_RECTANGLE_ARB );
169 glFlush();
170 }
172 gboolean gl_load_frame_buffer( frame_buffer_t frame, int tex_id )
173 {
174 GLenum type = colour_formats[frame->colour_format].type;
175 GLenum format = colour_formats[frame->colour_format].format;
176 int bpp = colour_formats[frame->colour_format].bpp;
177 int rowstride = (frame->rowstride / bpp) - frame->width;
179 glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
180 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
181 glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
182 frame->width, frame->height, format, type, frame->data );
183 return TRUE;
184 }
186 gboolean gl_display_blank( uint32_t colour )
187 {
188 gl_reset_state();
189 glColor3ub( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
190 glRecti(0,0, video_width, video_height );
191 glFlush();
192 return TRUE;
193 }
195 /**
196 * Generic GL read_render_buffer. This function assumes that the caller
197 * has already set the appropriate glReadBuffer(); in other words, unless
198 * there's only one buffer this needs to be wrapped.
199 */
200 gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer,
201 int rowstride, int colour_format )
202 {
203 glFinish();
204 GLenum type = colour_formats[colour_format].type;
205 GLenum format = colour_formats[colour_format].format;
206 // int line_size = buffer->width * colour_formats[colour_format].bpp;
207 // int size = line_size * buffer->height;
208 int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
209 glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
211 glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
212 return TRUE;
213 }
.