lxdream 0.9.1| filename | src/drivers/video_gl.c |
| changeset | 635:76c63aac3590 |
| next | 669:ab344e42bca9 |
| author | nkeynes |
| date | Wed Apr 02 01:46:58 2008 +0000 (16 years ago) |
| permissions | -rw-r--r-- |
| last change | Add configure-time checks for fbo and shader functions in libGL (so linking doesn't fail on really old libGL implementations) |
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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/video_gl.h"
25 extern uint32_t video_width, video_height;
27 /**
28 * Reset the gl state to simple orthographic projection with
29 * texturing, alpha/depth/scissor/cull tests disabled.
30 */
31 void gl_reset_state()
32 {
33 glViewport( 0, 0, video_width, video_height );
34 glMatrixMode(GL_PROJECTION);
35 glLoadIdentity();
36 glOrtho( 0, video_width, video_height, 0, 0, 65535 );
37 glMatrixMode(GL_MODELVIEW);
38 glLoadIdentity();
39 glDisable( GL_TEXTURE_2D );
40 glDisable( GL_ALPHA_TEST );
41 glDisable( GL_DEPTH_TEST );
42 glDisable( GL_SCISSOR_TEST );
43 glDisable( GL_CULL_FACE );
44 glDrawBuffer( GL_FRONT );
45 }
47 void gl_display_render_buffer( render_buffer_t buffer )
48 {
49 gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
50 }
52 void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
53 {
54 float top, bottom;
55 if( inverted ) {
56 top = ((float)height);
57 bottom = 0;
58 } else {
59 top = 0;
60 bottom = ((float)height);
61 }
63 /* Reset display parameters */
64 gl_reset_state();
65 glColor3f( 0,0,0 );
67 int x1=0,y1=0,x2=video_width,y2=video_height;
69 int ah = video_width * 0.75;
71 if( ah > video_height ) {
72 int w = (video_height/0.75);
73 x1 = (video_width - w)/2;
74 x2 -= x1;
76 glBegin( GL_QUADS );
77 glVertex2f( 0, 0 );
78 glVertex2f( x1, 0 );
79 glVertex2f( x1, video_height );
80 glVertex2f( 0, video_height);
81 glVertex2f( x2, 0 );
82 glVertex2f( video_width, 0 );
83 glVertex2f( video_width, video_height );
84 glVertex2f( x2, video_height);
85 glEnd();
86 } else if( ah < video_height ) {
87 y1 = (video_height - ah)/2;
88 y2 -= y1;
89 glBegin( GL_QUADS );
90 glVertex2f( 0, 0 );
91 glVertex2f( video_width, 0 );
92 glVertex2f( video_width, y1 );
93 glVertex2f( 0, y1 );
94 glVertex2f( 0, y2 );
95 glVertex2f( video_width, y2 );
96 glVertex2f( video_width, video_height );
97 glVertex2f( 0, video_height );
98 glEnd();
99 }
101 /* Render the textured rectangle */
102 glEnable( GL_TEXTURE_RECTANGLE_ARB );
103 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
104 glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
105 glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
106 glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
107 glEnable( GL_BLEND );
108 glBlendFunc( GL_ONE, GL_ZERO );
109 glBegin( GL_QUADS );
110 glTexCoord2f( 0, top );
111 glVertex2f( x1, y1 );
112 glTexCoord2f( ((float)width), top );
113 glVertex2f( x2, y1 );
114 glTexCoord2f( ((float)width), bottom );
115 glVertex2f( x2, y2 );
116 glTexCoord2f( 0, bottom );
117 glVertex2f( x1, y2 );
118 glEnd();
119 glDisable( GL_TEXTURE_RECTANGLE_ARB );
120 glFlush();
121 }
123 gboolean gl_load_frame_buffer( frame_buffer_t frame, int tex_id )
124 {
125 GLenum type = colour_formats[frame->colour_format].type;
126 GLenum format = colour_formats[frame->colour_format].format;
127 int bpp = colour_formats[frame->colour_format].bpp;
128 int rowstride = (frame->rowstride / bpp) - frame->width;
130 glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
131 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
132 glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
133 frame->width, frame->height, format, type, frame->data );
134 return TRUE;
135 }
137 gboolean gl_display_blank( uint32_t colour )
138 {
139 gl_reset_state();
140 glColor3ub( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
141 glRecti(0,0, video_width, video_height );
142 glFlush();
143 return TRUE;
144 }
146 /**
147 * Generic GL read_render_buffer. This function assumes that the caller
148 * has already set the appropriate glReadBuffer(); in other words, unless
149 * there's only one buffer this needs to be wrapped.
150 */
151 gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer,
152 int rowstride, int colour_format )
153 {
154 glFinish();
155 GLenum type = colour_formats[colour_format].type;
156 GLenum format = colour_formats[colour_format].format;
157 // int line_size = buffer->width * colour_formats[colour_format].bpp;
158 // int size = line_size * buffer->height;
159 int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
160 glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
162 glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
163 return TRUE;
164 }
.