nkeynes@635 | 1 | /**
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nkeynes@635 | 2 | * $Id$
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nkeynes@635 | 3 | *
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nkeynes@635 | 4 | * Common GL code that doesn't depend on a specific implementation
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nkeynes@635 | 5 | *
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nkeynes@635 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@635 | 7 | *
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nkeynes@635 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@635 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@635 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@635 | 11 | * (at your option) any later version.
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nkeynes@635 | 12 | *
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nkeynes@635 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@635 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@635 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@635 | 16 | * GNU General Public License for more details.
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nkeynes@635 | 17 | */
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nkeynes@635 | 18 |
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nkeynes@635 | 19 | #include <sys/time.h>
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nkeynes@635 | 20 |
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nkeynes@635 | 21 | #include "display.h"
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nkeynes@635 | 22 | #include "pvr2/pvr2.h"
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nkeynes@635 | 23 | #include "drivers/video_gl.h"
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nkeynes@635 | 24 |
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nkeynes@635 | 25 | extern uint32_t video_width, video_height;
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nkeynes@635 | 26 |
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nkeynes@635 | 27 | /**
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nkeynes@635 | 28 | * Reset the gl state to simple orthographic projection with
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nkeynes@635 | 29 | * texturing, alpha/depth/scissor/cull tests disabled.
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nkeynes@635 | 30 | */
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nkeynes@635 | 31 | void gl_reset_state()
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nkeynes@635 | 32 | {
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nkeynes@635 | 33 | glViewport( 0, 0, video_width, video_height );
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nkeynes@635 | 34 | glMatrixMode(GL_PROJECTION);
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nkeynes@635 | 35 | glLoadIdentity();
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nkeynes@635 | 36 | glOrtho( 0, video_width, video_height, 0, 0, 65535 );
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nkeynes@635 | 37 | glMatrixMode(GL_MODELVIEW);
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nkeynes@635 | 38 | glLoadIdentity();
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nkeynes@681 | 39 | glEnable( GL_BLEND );
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nkeynes@635 | 40 | glDisable( GL_TEXTURE_2D );
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nkeynes@681 | 41 | glDisable( GL_TEXTURE_RECTANGLE_ARB );
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nkeynes@635 | 42 | glDisable( GL_ALPHA_TEST );
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nkeynes@635 | 43 | glDisable( GL_DEPTH_TEST );
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nkeynes@635 | 44 | glDisable( GL_SCISSOR_TEST );
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nkeynes@635 | 45 | glDisable( GL_CULL_FACE );
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nkeynes@635 | 46 | glDrawBuffer( GL_FRONT );
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nkeynes@635 | 47 | }
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nkeynes@635 | 48 |
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nkeynes@635 | 49 | void gl_display_render_buffer( render_buffer_t buffer )
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nkeynes@635 | 50 | {
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nkeynes@635 | 51 | gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
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nkeynes@635 | 52 | }
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nkeynes@635 | 53 |
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nkeynes@635 | 54 | void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
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nkeynes@635 | 55 | {
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nkeynes@635 | 56 | float top, bottom;
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nkeynes@635 | 57 | if( inverted ) {
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nkeynes@736 | 58 | top = ((float)height);
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nkeynes@736 | 59 | bottom = 0;
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nkeynes@635 | 60 | } else {
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nkeynes@736 | 61 | top = 0;
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nkeynes@736 | 62 | bottom = ((float)height);
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nkeynes@635 | 63 | }
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nkeynes@635 | 64 |
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nkeynes@635 | 65 | /* Reset display parameters */
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nkeynes@635 | 66 | gl_reset_state();
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nkeynes@635 | 67 | glColor3f( 0,0,0 );
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nkeynes@635 | 68 |
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nkeynes@635 | 69 | int x1=0,y1=0,x2=video_width,y2=video_height;
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nkeynes@635 | 70 |
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nkeynes@635 | 71 | int ah = video_width * 0.75;
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nkeynes@635 | 72 |
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nkeynes@635 | 73 | if( ah > video_height ) {
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nkeynes@736 | 74 | int w = (video_height/0.75);
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nkeynes@736 | 75 | x1 = (video_width - w)/2;
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nkeynes@736 | 76 | x2 -= x1;
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nkeynes@635 | 77 |
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nkeynes@736 | 78 | glBegin( GL_QUADS );
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nkeynes@736 | 79 | glVertex2f( 0, 0 );
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nkeynes@736 | 80 | glVertex2f( x1, 0 );
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nkeynes@736 | 81 | glVertex2f( x1, video_height );
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nkeynes@736 | 82 | glVertex2f( 0, video_height);
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nkeynes@736 | 83 | glVertex2f( x2, 0 );
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nkeynes@736 | 84 | glVertex2f( video_width, 0 );
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nkeynes@736 | 85 | glVertex2f( video_width, video_height );
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nkeynes@736 | 86 | glVertex2f( x2, video_height);
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nkeynes@736 | 87 | glEnd();
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nkeynes@635 | 88 | } else if( ah < video_height ) {
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nkeynes@736 | 89 | y1 = (video_height - ah)/2;
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nkeynes@736 | 90 | y2 -= y1;
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nkeynes@736 | 91 | glBegin( GL_QUADS );
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nkeynes@736 | 92 | glVertex2f( 0, 0 );
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nkeynes@736 | 93 | glVertex2f( video_width, 0 );
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nkeynes@736 | 94 | glVertex2f( video_width, y1 );
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nkeynes@736 | 95 | glVertex2f( 0, y1 );
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nkeynes@736 | 96 | glVertex2f( 0, y2 );
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nkeynes@736 | 97 | glVertex2f( video_width, y2 );
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nkeynes@736 | 98 | glVertex2f( video_width, video_height );
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nkeynes@736 | 99 | glVertex2f( 0, video_height );
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nkeynes@736 | 100 | glEnd();
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nkeynes@635 | 101 | }
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nkeynes@635 | 102 |
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nkeynes@635 | 103 | /* Render the textured rectangle */
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nkeynes@635 | 104 | glEnable( GL_TEXTURE_RECTANGLE_ARB );
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nkeynes@635 | 105 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
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nkeynes@635 | 106 | glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
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nkeynes@635 | 107 | glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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nkeynes@635 | 108 | glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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nkeynes@635 | 109 | glEnable( GL_BLEND );
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nkeynes@635 | 110 | glBlendFunc( GL_ONE, GL_ZERO );
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nkeynes@635 | 111 | glBegin( GL_QUADS );
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nkeynes@635 | 112 | glTexCoord2f( 0, top );
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nkeynes@635 | 113 | glVertex2f( x1, y1 );
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nkeynes@635 | 114 | glTexCoord2f( ((float)width), top );
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nkeynes@635 | 115 | glVertex2f( x2, y1 );
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nkeynes@635 | 116 | glTexCoord2f( ((float)width), bottom );
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nkeynes@635 | 117 | glVertex2f( x2, y2 );
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nkeynes@635 | 118 | glTexCoord2f( 0, bottom );
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nkeynes@635 | 119 | glVertex2f( x1, y2 );
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nkeynes@635 | 120 | glEnd();
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nkeynes@635 | 121 | glDisable( GL_TEXTURE_RECTANGLE_ARB );
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nkeynes@635 | 122 | glFlush();
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nkeynes@635 | 123 | }
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nkeynes@635 | 124 |
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nkeynes@635 | 125 | gboolean gl_load_frame_buffer( frame_buffer_t frame, int tex_id )
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nkeynes@635 | 126 | {
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nkeynes@635 | 127 | GLenum type = colour_formats[frame->colour_format].type;
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nkeynes@635 | 128 | GLenum format = colour_formats[frame->colour_format].format;
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nkeynes@635 | 129 | int bpp = colour_formats[frame->colour_format].bpp;
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nkeynes@635 | 130 | int rowstride = (frame->rowstride / bpp) - frame->width;
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nkeynes@736 | 131 |
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nkeynes@635 | 132 | glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
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nkeynes@635 | 133 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
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nkeynes@635 | 134 | glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
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nkeynes@736 | 135 | frame->width, frame->height, format, type, frame->data );
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nkeynes@635 | 136 | return TRUE;
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nkeynes@635 | 137 | }
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nkeynes@635 | 138 |
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nkeynes@669 | 139 | void gl_display_blank( uint32_t colour )
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nkeynes@635 | 140 | {
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nkeynes@635 | 141 | gl_reset_state();
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nkeynes@635 | 142 | glColor3ub( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
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nkeynes@635 | 143 | glRecti(0,0, video_width, video_height );
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nkeynes@635 | 144 | glFlush();
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nkeynes@635 | 145 | }
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nkeynes@635 | 146 |
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nkeynes@635 | 147 | /**
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nkeynes@635 | 148 | * Generic GL read_render_buffer. This function assumes that the caller
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nkeynes@635 | 149 | * has already set the appropriate glReadBuffer(); in other words, unless
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nkeynes@635 | 150 | * there's only one buffer this needs to be wrapped.
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nkeynes@635 | 151 | */
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nkeynes@635 | 152 | gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer,
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nkeynes@736 | 153 | int rowstride, int colour_format )
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nkeynes@635 | 154 | {
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nkeynes@635 | 155 | glFinish();
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nkeynes@635 | 156 | GLenum type = colour_formats[colour_format].type;
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nkeynes@635 | 157 | GLenum format = colour_formats[colour_format].format;
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nkeynes@635 | 158 | // int line_size = buffer->width * colour_formats[colour_format].bpp;
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nkeynes@635 | 159 | // int size = line_size * buffer->height;
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nkeynes@635 | 160 | int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
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nkeynes@635 | 161 | glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
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nkeynes@736 | 162 |
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nkeynes@635 | 163 | glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
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nkeynes@635 | 164 | return TRUE;
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nkeynes@635 | 165 | }
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