nkeynes@352 | 1 | /**
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nkeynes@481 | 2 | * $Id: gl_common.c,v 1.7 2007-10-31 12:05:23 nkeynes Exp $
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nkeynes@352 | 3 | *
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nkeynes@352 | 4 | * Common GL code that doesn't depend on a specific implementation
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nkeynes@352 | 5 | *
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nkeynes@352 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@352 | 7 | *
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nkeynes@352 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@352 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@352 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@352 | 11 | * (at your option) any later version.
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nkeynes@352 | 12 | *
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nkeynes@352 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@352 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@352 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@352 | 16 | * GNU General Public License for more details.
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nkeynes@352 | 17 | */
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nkeynes@352 | 18 |
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nkeynes@443 | 19 | #include <sys/time.h>
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nkeynes@443 | 20 |
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nkeynes@352 | 21 | #include <GL/gl.h>
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nkeynes@352 | 22 | #include "dream.h"
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nkeynes@481 | 23 | #include "pvr2/pvr2.h"
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nkeynes@352 | 24 | #include "drivers/gl_common.h"
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nkeynes@352 | 25 |
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nkeynes@352 | 26 | extern uint32_t video_width, video_height;
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nkeynes@443 | 27 | static uint32_t frame_colour = 0;
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nkeynes@352 | 28 |
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nkeynes@352 | 29 | char *required_extensions[] = { "GL_EXT_framebuffer_object", NULL };
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nkeynes@352 | 30 |
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nkeynes@352 | 31 | /**
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nkeynes@352 | 32 | * Test if a specific extension is supported. From opengl.org
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nkeynes@352 | 33 | * @param extension extension name to check for
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nkeynes@352 | 34 | * @return TRUE if supported, otherwise FALSE.
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nkeynes@352 | 35 | */
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nkeynes@352 | 36 | gboolean isGLExtensionSupported( const char *extension )
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nkeynes@352 | 37 | {
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nkeynes@352 | 38 | const GLubyte *extensions = NULL;
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nkeynes@352 | 39 | const GLubyte *start;
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nkeynes@352 | 40 | GLubyte *where, *terminator;
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nkeynes@352 | 41 |
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nkeynes@352 | 42 | /* Extension names should not have spaces. */
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nkeynes@352 | 43 | where = (GLubyte *) strchr(extension, ' ');
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nkeynes@352 | 44 | if (where || *extension == '\0')
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nkeynes@352 | 45 | return 0;
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nkeynes@352 | 46 | extensions = glGetString(GL_EXTENSIONS);
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nkeynes@352 | 47 | /* It takes a bit of care to be fool-proof about parsing the
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nkeynes@352 | 48 | OpenGL extensions string. Don't be fooled by sub-strings,
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nkeynes@352 | 49 | etc. */
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nkeynes@352 | 50 | start = extensions;
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nkeynes@352 | 51 | for (;;) {
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nkeynes@352 | 52 | where = (GLubyte *) strstr((const char *) start, extension);
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nkeynes@352 | 53 | if (!where)
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nkeynes@352 | 54 | break;
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nkeynes@352 | 55 | terminator = where + strlen(extension);
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nkeynes@352 | 56 | if (where == start || *(where - 1) == ' ')
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nkeynes@352 | 57 | if (*terminator == ' ' || *terminator == '\0')
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nkeynes@352 | 58 | return TRUE;
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nkeynes@352 | 59 | start = terminator;
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nkeynes@352 | 60 | }
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nkeynes@352 | 61 | return FALSE;
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nkeynes@352 | 62 | }
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nkeynes@352 | 63 |
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nkeynes@352 | 64 | gboolean hasRequiredGLExtensions( )
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nkeynes@352 | 65 | {
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nkeynes@352 | 66 | int i;
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nkeynes@352 | 67 | gboolean isOK = TRUE;
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nkeynes@352 | 68 |
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nkeynes@352 | 69 | for( i=0; required_extensions[i] != NULL; i++ ) {
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nkeynes@352 | 70 | if( !isGLExtensionSupported(required_extensions[i]) ) {
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nkeynes@352 | 71 | ERROR( "Required OpenGL extension not supported: %s", required_extensions[i] );
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nkeynes@352 | 72 | isOK = FALSE;
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nkeynes@352 | 73 | }
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nkeynes@352 | 74 | }
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nkeynes@352 | 75 | return isOK;
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nkeynes@352 | 76 | }
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nkeynes@352 | 77 |
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nkeynes@477 | 78 | void gl_display_render_buffer( render_buffer_t buffer )
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nkeynes@443 | 79 | {
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nkeynes@443 | 80 | float top, bottom;
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nkeynes@477 | 81 | if( buffer->inverted ) {
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nkeynes@477 | 82 | top = ((float)buffer->height) - 0.5;
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nkeynes@443 | 83 | bottom = 0.5;
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nkeynes@443 | 84 | } else {
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nkeynes@443 | 85 | top = 0.5;
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nkeynes@477 | 86 | bottom = ((float)buffer->height) - 0.5;
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nkeynes@443 | 87 | }
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nkeynes@443 | 88 |
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nkeynes@443 | 89 | /* Reset display parameters */
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nkeynes@352 | 90 | glViewport( 0, 0, video_width, video_height );
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nkeynes@352 | 91 | glMatrixMode(GL_PROJECTION);
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nkeynes@352 | 92 | glLoadIdentity();
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nkeynes@352 | 93 | glOrtho( 0, video_width, video_height, 0, 0, -65535 );
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nkeynes@352 | 94 | glMatrixMode(GL_MODELVIEW);
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nkeynes@352 | 95 | glLoadIdentity();
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nkeynes@352 | 96 | glDisable( GL_TEXTURE_2D );
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nkeynes@352 | 97 | glDisable( GL_ALPHA_TEST );
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nkeynes@352 | 98 | glDisable( GL_DEPTH_TEST );
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nkeynes@352 | 99 | glDisable( GL_SCISSOR_TEST );
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nkeynes@352 | 100 | glDisable( GL_CULL_FACE );
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nkeynes@444 | 101 | glColor3f( 0,0,0 );
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nkeynes@444 | 102 |
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nkeynes@444 | 103 |
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nkeynes@444 | 104 | int x1=0,y1=0,x2=video_width,y2=video_height;
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nkeynes@444 | 105 |
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nkeynes@444 | 106 | int ah = video_width * 0.75;
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nkeynes@444 | 107 |
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nkeynes@444 | 108 | if( ah > video_height ) {
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nkeynes@444 | 109 | int w = (video_height/0.75);
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nkeynes@444 | 110 | x1 = (video_width - w)/2;
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nkeynes@444 | 111 | x2 -= x1;
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nkeynes@444 | 112 |
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nkeynes@444 | 113 | glBegin( GL_QUADS );
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nkeynes@444 | 114 | glVertex2f( 0, 0 );
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nkeynes@444 | 115 | glVertex2f( x1, 0 );
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nkeynes@444 | 116 | glVertex2f( x1, video_height );
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nkeynes@444 | 117 | glVertex2f( 0, video_height);
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nkeynes@444 | 118 | glVertex2f( x2, 0 );
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nkeynes@444 | 119 | glVertex2f( video_width, 0 );
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nkeynes@444 | 120 | glVertex2f( video_width, video_height );
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nkeynes@444 | 121 | glVertex2f( x2, video_height);
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nkeynes@444 | 122 | glEnd();
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nkeynes@444 | 123 | } else if( ah < video_height ) {
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nkeynes@444 | 124 | y1 = (video_height - ah)/2;
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nkeynes@444 | 125 | y2 -= y1;
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nkeynes@444 | 126 | glBegin( GL_QUADS );
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nkeynes@444 | 127 | glVertex2f( 0, 0 );
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nkeynes@444 | 128 | glVertex2f( video_width, 0 );
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nkeynes@444 | 129 | glVertex2f( video_width, y1 );
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nkeynes@444 | 130 | glVertex2f( 0, y1 );
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nkeynes@444 | 131 | glVertex2f( 0, y2 );
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nkeynes@444 | 132 | glVertex2f( video_width, y2 );
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nkeynes@444 | 133 | glVertex2f( video_width, video_height );
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nkeynes@444 | 134 | glVertex2f( 0, video_height );
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nkeynes@444 | 135 | glEnd();
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nkeynes@444 | 136 | }
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nkeynes@352 | 137 |
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nkeynes@443 | 138 | /* Render the textured rectangle */
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nkeynes@443 | 139 | glEnable( GL_TEXTURE_RECTANGLE_ARB );
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nkeynes@477 | 140 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, buffer->buf_id );
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nkeynes@443 | 141 | glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
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nkeynes@443 | 142 | glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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nkeynes@443 | 143 | glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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nkeynes@443 | 144 | glEnable( GL_BLEND );
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nkeynes@443 | 145 | glBlendFunc( GL_ONE, GL_ZERO );
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nkeynes@352 | 146 | glBegin( GL_QUADS );
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nkeynes@443 | 147 | glTexCoord2f( 0.5, top );
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nkeynes@444 | 148 | glVertex2f( x1, y1 );
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nkeynes@477 | 149 | glTexCoord2f( ((float)buffer->width)-0.5, top );
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nkeynes@444 | 150 | glVertex2f( x2, y1 );
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nkeynes@477 | 151 | glTexCoord2f( ((float)buffer->width)-0.5, bottom );
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nkeynes@444 | 152 | glVertex2f( x2, y2 );
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nkeynes@443 | 153 | glTexCoord2f( 0.5, bottom );
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nkeynes@444 | 154 | glVertex2f( x1, y2 );
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nkeynes@352 | 155 | glEnd();
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nkeynes@443 | 156 | glDisable( GL_TEXTURE_RECTANGLE_ARB );
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nkeynes@352 | 157 | glFlush();
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nkeynes@443 | 158 | }
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nkeynes@443 | 159 |
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nkeynes@477 | 160 | gboolean gl_load_frame_buffer( frame_buffer_t frame, render_buffer_t render )
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nkeynes@443 | 161 | {
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nkeynes@477 | 162 | GLenum type = colour_formats[frame->colour_format].type;
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nkeynes@477 | 163 | GLenum format = colour_formats[frame->colour_format].format;
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nkeynes@477 | 164 | int bpp = colour_formats[frame->colour_format].bpp;
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nkeynes@477 | 165 | int rowstride = (frame->rowstride / bpp) - frame->width;
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nkeynes@477 | 166 |
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nkeynes@477 | 167 | glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
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nkeynes@477 | 168 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, render->buf_id );
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nkeynes@477 | 169 | glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
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nkeynes@481 | 170 | frame->width, frame->height, format, type, frame->data );
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nkeynes@481 | 171 | return TRUE;
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nkeynes@352 | 172 | }
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nkeynes@352 | 173 |
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nkeynes@352 | 174 | gboolean gl_display_blank( uint32_t colour )
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nkeynes@352 | 175 | {
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nkeynes@352 | 176 | glViewport( 0, 0, video_width, video_height );
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nkeynes@352 | 177 | glMatrixMode( GL_PROJECTION );
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nkeynes@352 | 178 | glLoadIdentity();
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nkeynes@352 | 179 | glOrtho( 0, video_width, video_height, 0, 0, -65535 );
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nkeynes@352 | 180 | glMatrixMode(GL_MODELVIEW);
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nkeynes@352 | 181 | glLoadIdentity();
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nkeynes@352 | 182 | glColor3b( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
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nkeynes@352 | 183 | glRecti(0,0, video_width, video_height );
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nkeynes@352 | 184 | glFlush();
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nkeynes@443 | 185 | frame_colour = colour;
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nkeynes@352 | 186 | return TRUE;
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nkeynes@352 | 187 | }
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nkeynes@352 | 188 |
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nkeynes@443 | 189 | void gl_redisplay_last()
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nkeynes@443 | 190 | {
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nkeynes@477 | 191 | render_buffer_t buffer = pvr2_get_front_buffer();
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nkeynes@477 | 192 | if( buffer == NULL ) {
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nkeynes@443 | 193 | gl_display_blank( frame_colour );
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nkeynes@443 | 194 | } else {
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nkeynes@477 | 195 | gl_display_render_buffer( buffer );
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nkeynes@443 | 196 | }
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nkeynes@443 | 197 | }
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nkeynes@443 | 198 |
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nkeynes@352 | 199 | /**
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nkeynes@352 | 200 | * Generic GL read_render_buffer. This function assumes that the caller
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nkeynes@352 | 201 | * has already set the appropriate glReadBuffer(); in other words, unless
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nkeynes@352 | 202 | * there's only one buffer this needs to be wrapped.
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nkeynes@352 | 203 | */
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nkeynes@477 | 204 | gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer,
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nkeynes@477 | 205 | int rowstride, int colour_format )
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nkeynes@352 | 206 | {
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nkeynes@352 | 207 | glFinish();
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nkeynes@477 | 208 | GLenum type = colour_formats[colour_format].type;
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nkeynes@477 | 209 | GLenum format = colour_formats[colour_format].format;
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nkeynes@477 | 210 | // int line_size = buffer->width * colour_formats[colour_format].bpp;
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nkeynes@424 | 211 | // int size = line_size * buffer->height;
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nkeynes@477 | 212 | int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
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nkeynes@477 | 213 | glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
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nkeynes@352 | 214 |
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nkeynes@352 | 215 | glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
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nkeynes@352 | 216 | return TRUE;
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nkeynes@352 | 217 | }
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