filename | src/drivers/video_gl.c |
changeset | 1076:18c164e8aec4 |
prev | 854:130928a3cdcb |
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author | nkeynes |
date | Sun Dec 20 21:01:03 2009 +1000 (14 years ago) |
permissions | -rw-r--r-- |
last change | Fix 64-bit x86 disassembly Add crash-report hook to SIGILL and SIGBUS |
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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 glEnable( GL_BLEND );
40 glDisable( GL_TEXTURE_2D );
41 glDisable( GL_TEXTURE_RECTANGLE_ARB );
42 glDisable( GL_ALPHA_TEST );
43 glDisable( GL_DEPTH_TEST );
44 glDisable( GL_SCISSOR_TEST );
45 glDisable( GL_CULL_FACE );
46 }
48 void gl_display_render_buffer( render_buffer_t buffer )
49 {
50 gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
51 }
53 /**
54 * Convert window coordinates to dreamcast device coords (640x480) using the
55 * same viewable area as gl_texture_window.
56 * If the coordinates are outside the viewable area, the result is -1,-1.
57 */
58 void gl_window_to_system_coords( int *x, int *y )
59 {
60 int x1=0,y1=0,x2=video_width,y2=video_height;
62 int ah = video_width * 0.75;
64 if( ah > video_height ) {
65 int w = (video_height/0.75);
66 x1 = (video_width - w)/2;
67 x2 -= x1;
68 } else if( ah < video_height ) {
69 y1 = (video_height - ah)/2;
70 y2 -= y1;
71 }
72 if( *x < x1 || *x >= x2 || *y < y1 || *y >= y2 ) {
73 *x = -1;
74 *y = -1;
75 } else {
76 *x = (*x - x1) * DISPLAY_WIDTH / (x2-x1);
77 *y = (*y - y1) * DISPLAY_HEIGHT / (y2-y1);
78 }
79 }
81 void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
82 {
83 float top, bottom;
84 if( inverted ) {
85 top = ((float)height);
86 bottom = 0;
87 } else {
88 top = 0;
89 bottom = ((float)height);
90 }
92 /* Reset display parameters */
93 gl_reset_state();
94 glColor3f( 0,0,0 );
96 int x1=0,y1=0,x2=video_width,y2=video_height;
98 int ah = video_width * 0.75;
100 if( ah > video_height ) {
101 int w = (video_height/0.75);
102 x1 = (video_width - w)/2;
103 x2 -= x1;
105 glBegin( GL_QUADS );
106 glVertex2f( 0, 0 );
107 glVertex2f( x1, 0 );
108 glVertex2f( x1, video_height );
109 glVertex2f( 0, video_height);
110 glVertex2f( x2, 0 );
111 glVertex2f( video_width, 0 );
112 glVertex2f( video_width, video_height );
113 glVertex2f( x2, video_height);
114 glEnd();
115 } else if( ah < video_height ) {
116 y1 = (video_height - ah)/2;
117 y2 -= y1;
118 glBegin( GL_QUADS );
119 glVertex2f( 0, 0 );
120 glVertex2f( video_width, 0 );
121 glVertex2f( video_width, y1 );
122 glVertex2f( 0, y1 );
123 glVertex2f( 0, y2 );
124 glVertex2f( video_width, y2 );
125 glVertex2f( video_width, video_height );
126 glVertex2f( 0, video_height );
127 glEnd();
128 }
130 /* Render the textured rectangle */
131 glEnable( GL_TEXTURE_RECTANGLE_ARB );
132 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
133 glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
134 glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
135 glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
136 glEnable( GL_BLEND );
137 glBlendFunc( GL_ONE, GL_ZERO );
138 glBegin( GL_QUADS );
139 glTexCoord2f( 0, top );
140 glVertex2f( x1, y1 );
141 glTexCoord2f( ((float)width), top );
142 glVertex2f( x2, y1 );
143 glTexCoord2f( ((float)width), bottom );
144 glVertex2f( x2, y2 );
145 glTexCoord2f( 0, bottom );
146 glVertex2f( x1, y2 );
147 glEnd();
148 glDisable( GL_TEXTURE_RECTANGLE_ARB );
149 glFlush();
150 }
152 gboolean gl_load_frame_buffer( frame_buffer_t frame, int tex_id )
153 {
154 GLenum type = colour_formats[frame->colour_format].type;
155 GLenum format = colour_formats[frame->colour_format].format;
156 int bpp = colour_formats[frame->colour_format].bpp;
157 int rowstride = (frame->rowstride / bpp) - frame->width;
159 glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
160 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
161 glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
162 frame->width, frame->height, format, type, frame->data );
163 return TRUE;
164 }
166 void gl_display_blank( uint32_t colour )
167 {
168 gl_reset_state();
169 glColor3ub( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
170 glRecti(0,0, video_width, video_height );
171 glFlush();
172 }
174 /**
175 * Generic GL read_render_buffer. This function assumes that the caller
176 * has already set the appropriate glReadBuffer(); in other words, unless
177 * there's only one buffer this needs to be wrapped.
178 */
179 gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer,
180 int rowstride, int colour_format )
181 {
182 glFinish();
183 GLenum type = colour_formats[colour_format].type;
184 GLenum format = colour_formats[colour_format].format;
185 // int line_size = buffer->width * colour_formats[colour_format].bpp;
186 // int size = line_size * buffer->height;
187 int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
188 glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
190 glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
191 return TRUE;
192 }
.