filename | src/drivers/gl_common.c |
changeset | 540:a3767018a96d |
prev | 481:3b2d6c5a19ad |
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author | nkeynes |
date | Thu Nov 22 11:10:15 2007 +0000 (16 years ago) |
permissions | -rw-r--r-- |
last change | Re-add "Load Binary" menu item (misplaced in GUI rewrite) Prevent running with no code loaded |
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1 /**
2 * $Id: gl_common.c,v 1.7 2007-10-31 12:05:23 nkeynes Exp $
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;
26 static uint32_t frame_colour = 0;
28 char *required_extensions[] = { "GL_EXT_framebuffer_object", NULL };
30 /**
31 * Test if a specific extension is supported. From opengl.org
32 * @param extension extension name to check for
33 * @return TRUE if supported, otherwise FALSE.
34 */
35 gboolean isGLExtensionSupported( const char *extension )
36 {
37 const GLubyte *extensions = NULL;
38 const GLubyte *start;
39 GLubyte *where, *terminator;
41 /* Extension names should not have spaces. */
42 where = (GLubyte *) strchr(extension, ' ');
43 if (where || *extension == '\0')
44 return 0;
45 extensions = glGetString(GL_EXTENSIONS);
46 /* It takes a bit of care to be fool-proof about parsing the
47 OpenGL extensions string. Don't be fooled by sub-strings,
48 etc. */
49 start = extensions;
50 for (;;) {
51 where = (GLubyte *) strstr((const char *) start, extension);
52 if (!where)
53 break;
54 terminator = where + strlen(extension);
55 if (where == start || *(where - 1) == ' ')
56 if (*terminator == ' ' || *terminator == '\0')
57 return TRUE;
58 start = terminator;
59 }
60 return FALSE;
61 }
63 gboolean hasRequiredGLExtensions( )
64 {
65 int i;
66 gboolean isOK = TRUE;
68 for( i=0; required_extensions[i] != NULL; i++ ) {
69 if( !isGLExtensionSupported(required_extensions[i]) ) {
70 ERROR( "Required OpenGL extension not supported: %s", required_extensions[i] );
71 isOK = FALSE;
72 }
73 }
74 return isOK;
75 }
77 void gl_display_render_buffer( render_buffer_t buffer )
78 {
79 float top, bottom;
80 if( buffer->inverted ) {
81 top = ((float)buffer->height) - 0.5;
82 bottom = 0.5;
83 } else {
84 top = 0.5;
85 bottom = ((float)buffer->height) - 0.5;
86 }
88 /* Reset display parameters */
89 glViewport( 0, 0, video_width, video_height );
90 glMatrixMode(GL_PROJECTION);
91 glLoadIdentity();
92 glOrtho( 0, video_width, video_height, 0, 0, -65535 );
93 glMatrixMode(GL_MODELVIEW);
94 glLoadIdentity();
95 glDisable( GL_TEXTURE_2D );
96 glDisable( GL_ALPHA_TEST );
97 glDisable( GL_DEPTH_TEST );
98 glDisable( GL_SCISSOR_TEST );
99 glDisable( GL_CULL_FACE );
100 glColor3f( 0,0,0 );
103 int x1=0,y1=0,x2=video_width,y2=video_height;
105 int ah = video_width * 0.75;
107 if( ah > video_height ) {
108 int w = (video_height/0.75);
109 x1 = (video_width - w)/2;
110 x2 -= x1;
112 glBegin( GL_QUADS );
113 glVertex2f( 0, 0 );
114 glVertex2f( x1, 0 );
115 glVertex2f( x1, video_height );
116 glVertex2f( 0, video_height);
117 glVertex2f( x2, 0 );
118 glVertex2f( video_width, 0 );
119 glVertex2f( video_width, video_height );
120 glVertex2f( x2, video_height);
121 glEnd();
122 } else if( ah < video_height ) {
123 y1 = (video_height - ah)/2;
124 y2 -= y1;
125 glBegin( GL_QUADS );
126 glVertex2f( 0, 0 );
127 glVertex2f( video_width, 0 );
128 glVertex2f( video_width, y1 );
129 glVertex2f( 0, y1 );
130 glVertex2f( 0, y2 );
131 glVertex2f( video_width, y2 );
132 glVertex2f( video_width, video_height );
133 glVertex2f( 0, video_height );
134 glEnd();
135 }
137 /* Render the textured rectangle */
138 glEnable( GL_TEXTURE_RECTANGLE_ARB );
139 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, buffer->buf_id );
140 glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
141 glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
142 glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
143 glEnable( GL_BLEND );
144 glBlendFunc( GL_ONE, GL_ZERO );
145 glBegin( GL_QUADS );
146 glTexCoord2f( 0.5, top );
147 glVertex2f( x1, y1 );
148 glTexCoord2f( ((float)buffer->width)-0.5, top );
149 glVertex2f( x2, y1 );
150 glTexCoord2f( ((float)buffer->width)-0.5, bottom );
151 glVertex2f( x2, y2 );
152 glTexCoord2f( 0.5, bottom );
153 glVertex2f( x1, y2 );
154 glEnd();
155 glDisable( GL_TEXTURE_RECTANGLE_ARB );
156 glFlush();
157 }
159 gboolean gl_load_frame_buffer( frame_buffer_t frame, render_buffer_t render )
160 {
161 GLenum type = colour_formats[frame->colour_format].type;
162 GLenum format = colour_formats[frame->colour_format].format;
163 int bpp = colour_formats[frame->colour_format].bpp;
164 int rowstride = (frame->rowstride / bpp) - frame->width;
166 glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
167 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, render->buf_id );
168 glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
169 frame->width, frame->height, format, type, frame->data );
170 return TRUE;
171 }
173 gboolean gl_display_blank( uint32_t colour )
174 {
175 glViewport( 0, 0, video_width, video_height );
176 glMatrixMode( GL_PROJECTION );
177 glLoadIdentity();
178 glOrtho( 0, video_width, video_height, 0, 0, -65535 );
179 glMatrixMode(GL_MODELVIEW);
180 glLoadIdentity();
181 glColor3b( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
182 glRecti(0,0, video_width, video_height );
183 glFlush();
184 frame_colour = colour;
185 return TRUE;
186 }
188 void gl_redisplay_last()
189 {
190 render_buffer_t buffer = pvr2_get_front_buffer();
191 if( buffer == NULL ) {
192 gl_display_blank( frame_colour );
193 } else {
194 gl_display_render_buffer( buffer );
195 }
196 }
198 /**
199 * Generic GL read_render_buffer. This function assumes that the caller
200 * has already set the appropriate glReadBuffer(); in other words, unless
201 * there's only one buffer this needs to be wrapped.
202 */
203 gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer,
204 int rowstride, int colour_format )
205 {
206 glFinish();
207 GLenum type = colour_formats[colour_format].type;
208 GLenum format = colour_formats[colour_format].format;
209 // int line_size = buffer->width * colour_formats[colour_format].bpp;
210 // int size = line_size * buffer->height;
211 int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
212 glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
214 glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
215 return TRUE;
216 }
.