nkeynes@352 | 1 | /**
|
nkeynes@586 | 2 | * $Id$
|
nkeynes@352 | 3 | *
|
nkeynes@352 | 4 | * Common GL code that doesn't depend on a specific implementation
|
nkeynes@352 | 5 | *
|
nkeynes@352 | 6 | * Copyright (c) 2005 Nathan Keynes.
|
nkeynes@352 | 7 | *
|
nkeynes@352 | 8 | * This program is free software; you can redistribute it and/or modify
|
nkeynes@352 | 9 | * it under the terms of the GNU General Public License as published by
|
nkeynes@352 | 10 | * the Free Software Foundation; either version 2 of the License, or
|
nkeynes@352 | 11 | * (at your option) any later version.
|
nkeynes@352 | 12 | *
|
nkeynes@352 | 13 | * This program is distributed in the hope that it will be useful,
|
nkeynes@352 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
nkeynes@352 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
nkeynes@352 | 16 | * GNU General Public License for more details.
|
nkeynes@352 | 17 | */
|
nkeynes@352 | 18 |
|
nkeynes@443 | 19 | #include <sys/time.h>
|
nkeynes@443 | 20 |
|
nkeynes@540 | 21 | #include "display.h"
|
nkeynes@481 | 22 | #include "pvr2/pvr2.h"
|
nkeynes@352 | 23 | #include "drivers/gl_common.h"
|
nkeynes@352 | 24 |
|
nkeynes@352 | 25 | extern uint32_t video_width, video_height;
|
nkeynes@352 | 26 |
|
nkeynes@352 | 27 | char *required_extensions[] = { "GL_EXT_framebuffer_object", NULL };
|
nkeynes@352 | 28 |
|
nkeynes@352 | 29 | /**
|
nkeynes@352 | 30 | * Test if a specific extension is supported. From opengl.org
|
nkeynes@352 | 31 | * @param extension extension name to check for
|
nkeynes@352 | 32 | * @return TRUE if supported, otherwise FALSE.
|
nkeynes@352 | 33 | */
|
nkeynes@352 | 34 | gboolean isGLExtensionSupported( const char *extension )
|
nkeynes@352 | 35 | {
|
nkeynes@352 | 36 | const GLubyte *extensions = NULL;
|
nkeynes@352 | 37 | const GLubyte *start;
|
nkeynes@352 | 38 | GLubyte *where, *terminator;
|
nkeynes@352 | 39 |
|
nkeynes@352 | 40 | /* Extension names should not have spaces. */
|
nkeynes@352 | 41 | where = (GLubyte *) strchr(extension, ' ');
|
nkeynes@352 | 42 | if (where || *extension == '\0')
|
nkeynes@352 | 43 | return 0;
|
nkeynes@352 | 44 | extensions = glGetString(GL_EXTENSIONS);
|
nkeynes@352 | 45 | /* It takes a bit of care to be fool-proof about parsing the
|
nkeynes@352 | 46 | OpenGL extensions string. Don't be fooled by sub-strings,
|
nkeynes@352 | 47 | etc. */
|
nkeynes@352 | 48 | start = extensions;
|
nkeynes@352 | 49 | for (;;) {
|
nkeynes@352 | 50 | where = (GLubyte *) strstr((const char *) start, extension);
|
nkeynes@352 | 51 | if (!where)
|
nkeynes@352 | 52 | break;
|
nkeynes@352 | 53 | terminator = where + strlen(extension);
|
nkeynes@352 | 54 | if (where == start || *(where - 1) == ' ')
|
nkeynes@352 | 55 | if (*terminator == ' ' || *terminator == '\0')
|
nkeynes@352 | 56 | return TRUE;
|
nkeynes@352 | 57 | start = terminator;
|
nkeynes@352 | 58 | }
|
nkeynes@352 | 59 | return FALSE;
|
nkeynes@352 | 60 | }
|
nkeynes@352 | 61 |
|
nkeynes@352 | 62 | gboolean hasRequiredGLExtensions( )
|
nkeynes@352 | 63 | {
|
nkeynes@352 | 64 | int i;
|
nkeynes@352 | 65 | gboolean isOK = TRUE;
|
nkeynes@352 | 66 |
|
nkeynes@352 | 67 | for( i=0; required_extensions[i] != NULL; i++ ) {
|
nkeynes@352 | 68 | if( !isGLExtensionSupported(required_extensions[i]) ) {
|
nkeynes@352 | 69 | ERROR( "Required OpenGL extension not supported: %s", required_extensions[i] );
|
nkeynes@352 | 70 | isOK = FALSE;
|
nkeynes@352 | 71 | }
|
nkeynes@352 | 72 | }
|
nkeynes@352 | 73 | return isOK;
|
nkeynes@352 | 74 | }
|
nkeynes@352 | 75 |
|
nkeynes@545 | 76 | /**
|
nkeynes@545 | 77 | * Reset the gl state to simple orthographic projection with
|
nkeynes@545 | 78 | * texturing, alpha/depth/scissor/cull tests disabled.
|
nkeynes@545 | 79 | */
|
nkeynes@545 | 80 | void gl_reset_state()
|
nkeynes@443 | 81 | {
|
nkeynes@352 | 82 | glViewport( 0, 0, video_width, video_height );
|
nkeynes@352 | 83 | glMatrixMode(GL_PROJECTION);
|
nkeynes@352 | 84 | glLoadIdentity();
|
nkeynes@352 | 85 | glOrtho( 0, video_width, video_height, 0, 0, -65535 );
|
nkeynes@352 | 86 | glMatrixMode(GL_MODELVIEW);
|
nkeynes@352 | 87 | glLoadIdentity();
|
nkeynes@352 | 88 | glDisable( GL_TEXTURE_2D );
|
nkeynes@352 | 89 | glDisable( GL_ALPHA_TEST );
|
nkeynes@352 | 90 | glDisable( GL_DEPTH_TEST );
|
nkeynes@352 | 91 | glDisable( GL_SCISSOR_TEST );
|
nkeynes@352 | 92 | glDisable( GL_CULL_FACE );
|
nkeynes@545 | 93 | glDrawBuffer( GL_FRONT );
|
nkeynes@545 | 94 | }
|
nkeynes@545 | 95 |
|
nkeynes@545 | 96 | void gl_display_render_buffer( render_buffer_t buffer )
|
nkeynes@545 | 97 | {
|
nkeynes@545 | 98 | gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
|
nkeynes@545 | 99 | }
|
nkeynes@545 | 100 |
|
nkeynes@545 | 101 | void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
|
nkeynes@545 | 102 | {
|
nkeynes@545 | 103 | float top, bottom;
|
nkeynes@545 | 104 | if( inverted ) {
|
nkeynes@586 | 105 | top = ((float)height);
|
nkeynes@586 | 106 | bottom = 0;
|
nkeynes@545 | 107 | } else {
|
nkeynes@586 | 108 | top = 0;
|
nkeynes@586 | 109 | bottom = ((float)height);
|
nkeynes@545 | 110 | }
|
nkeynes@545 | 111 |
|
nkeynes@545 | 112 | /* Reset display parameters */
|
nkeynes@545 | 113 | gl_reset_state();
|
nkeynes@545 | 114 | glColor3f( 0,0,0 );
|
nkeynes@444 | 115 |
|
nkeynes@444 | 116 | int x1=0,y1=0,x2=video_width,y2=video_height;
|
nkeynes@444 | 117 |
|
nkeynes@444 | 118 | int ah = video_width * 0.75;
|
nkeynes@444 | 119 |
|
nkeynes@444 | 120 | if( ah > video_height ) {
|
nkeynes@444 | 121 | int w = (video_height/0.75);
|
nkeynes@444 | 122 | x1 = (video_width - w)/2;
|
nkeynes@444 | 123 | x2 -= x1;
|
nkeynes@444 | 124 |
|
nkeynes@444 | 125 | glBegin( GL_QUADS );
|
nkeynes@444 | 126 | glVertex2f( 0, 0 );
|
nkeynes@444 | 127 | glVertex2f( x1, 0 );
|
nkeynes@444 | 128 | glVertex2f( x1, video_height );
|
nkeynes@444 | 129 | glVertex2f( 0, video_height);
|
nkeynes@444 | 130 | glVertex2f( x2, 0 );
|
nkeynes@444 | 131 | glVertex2f( video_width, 0 );
|
nkeynes@444 | 132 | glVertex2f( video_width, video_height );
|
nkeynes@444 | 133 | glVertex2f( x2, video_height);
|
nkeynes@444 | 134 | glEnd();
|
nkeynes@444 | 135 | } else if( ah < video_height ) {
|
nkeynes@444 | 136 | y1 = (video_height - ah)/2;
|
nkeynes@444 | 137 | y2 -= y1;
|
nkeynes@444 | 138 | glBegin( GL_QUADS );
|
nkeynes@444 | 139 | glVertex2f( 0, 0 );
|
nkeynes@444 | 140 | glVertex2f( video_width, 0 );
|
nkeynes@444 | 141 | glVertex2f( video_width, y1 );
|
nkeynes@444 | 142 | glVertex2f( 0, y1 );
|
nkeynes@444 | 143 | glVertex2f( 0, y2 );
|
nkeynes@444 | 144 | glVertex2f( video_width, y2 );
|
nkeynes@444 | 145 | glVertex2f( video_width, video_height );
|
nkeynes@444 | 146 | glVertex2f( 0, video_height );
|
nkeynes@444 | 147 | glEnd();
|
nkeynes@444 | 148 | }
|
nkeynes@352 | 149 |
|
nkeynes@443 | 150 | /* Render the textured rectangle */
|
nkeynes@443 | 151 | glEnable( GL_TEXTURE_RECTANGLE_ARB );
|
nkeynes@545 | 152 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
|
nkeynes@443 | 153 | glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
|
nkeynes@443 | 154 | glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
nkeynes@443 | 155 | glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
nkeynes@443 | 156 | glEnable( GL_BLEND );
|
nkeynes@443 | 157 | glBlendFunc( GL_ONE, GL_ZERO );
|
nkeynes@352 | 158 | glBegin( GL_QUADS );
|
nkeynes@586 | 159 | glTexCoord2f( 0, top );
|
nkeynes@444 | 160 | glVertex2f( x1, y1 );
|
nkeynes@586 | 161 | glTexCoord2f( ((float)width), top );
|
nkeynes@444 | 162 | glVertex2f( x2, y1 );
|
nkeynes@586 | 163 | glTexCoord2f( ((float)width), bottom );
|
nkeynes@444 | 164 | glVertex2f( x2, y2 );
|
nkeynes@586 | 165 | glTexCoord2f( 0, bottom );
|
nkeynes@444 | 166 | glVertex2f( x1, y2 );
|
nkeynes@352 | 167 | glEnd();
|
nkeynes@443 | 168 | glDisable( GL_TEXTURE_RECTANGLE_ARB );
|
nkeynes@352 | 169 | glFlush();
|
nkeynes@443 | 170 | }
|
nkeynes@443 | 171 |
|
nkeynes@545 | 172 | gboolean gl_load_frame_buffer( frame_buffer_t frame, int tex_id )
|
nkeynes@443 | 173 | {
|
nkeynes@477 | 174 | GLenum type = colour_formats[frame->colour_format].type;
|
nkeynes@477 | 175 | GLenum format = colour_formats[frame->colour_format].format;
|
nkeynes@477 | 176 | int bpp = colour_formats[frame->colour_format].bpp;
|
nkeynes@477 | 177 | int rowstride = (frame->rowstride / bpp) - frame->width;
|
nkeynes@477 | 178 |
|
nkeynes@477 | 179 | glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
|
nkeynes@545 | 180 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
|
nkeynes@477 | 181 | glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
|
nkeynes@481 | 182 | frame->width, frame->height, format, type, frame->data );
|
nkeynes@481 | 183 | return TRUE;
|
nkeynes@352 | 184 | }
|
nkeynes@352 | 185 |
|
nkeynes@352 | 186 | gboolean gl_display_blank( uint32_t colour )
|
nkeynes@352 | 187 | {
|
nkeynes@545 | 188 | gl_reset_state();
|
nkeynes@545 | 189 | glColor3ub( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
|
nkeynes@352 | 190 | glRecti(0,0, video_width, video_height );
|
nkeynes@352 | 191 | glFlush();
|
nkeynes@352 | 192 | return TRUE;
|
nkeynes@352 | 193 | }
|
nkeynes@352 | 194 |
|
nkeynes@352 | 195 | /**
|
nkeynes@352 | 196 | * Generic GL read_render_buffer. This function assumes that the caller
|
nkeynes@352 | 197 | * has already set the appropriate glReadBuffer(); in other words, unless
|
nkeynes@352 | 198 | * there's only one buffer this needs to be wrapped.
|
nkeynes@352 | 199 | */
|
nkeynes@477 | 200 | gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer,
|
nkeynes@477 | 201 | int rowstride, int colour_format )
|
nkeynes@352 | 202 | {
|
nkeynes@352 | 203 | glFinish();
|
nkeynes@477 | 204 | GLenum type = colour_formats[colour_format].type;
|
nkeynes@477 | 205 | GLenum format = colour_formats[colour_format].format;
|
nkeynes@477 | 206 | // int line_size = buffer->width * colour_formats[colour_format].bpp;
|
nkeynes@424 | 207 | // int size = line_size * buffer->height;
|
nkeynes@477 | 208 | int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
|
nkeynes@477 | 209 | glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
|
nkeynes@352 | 210 |
|
nkeynes@352 | 211 | glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
|
nkeynes@352 | 212 | return TRUE;
|
nkeynes@352 | 213 | }
|