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 | }
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nkeynes@635 | 47 |
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nkeynes@635 | 48 | void gl_display_render_buffer( render_buffer_t buffer )
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nkeynes@635 | 49 | {
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nkeynes@635 | 50 | gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
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nkeynes@635 | 51 | }
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nkeynes@635 | 52 |
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nkeynes@854 | 53 | /**
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nkeynes@854 | 54 | * Convert window coordinates to dreamcast device coords (640x480) using the
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nkeynes@854 | 55 | * same viewable area as gl_texture_window.
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nkeynes@854 | 56 | * If the coordinates are outside the viewable area, the result is -1,-1.
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nkeynes@854 | 57 | */
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nkeynes@854 | 58 | void gl_window_to_system_coords( int *x, int *y )
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nkeynes@854 | 59 | {
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nkeynes@854 | 60 | int x1=0,y1=0,x2=video_width,y2=video_height;
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nkeynes@854 | 61 |
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nkeynes@854 | 62 | int ah = video_width * 0.75;
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nkeynes@854 | 63 |
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nkeynes@854 | 64 | if( ah > video_height ) {
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nkeynes@854 | 65 | int w = (video_height/0.75);
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nkeynes@854 | 66 | x1 = (video_width - w)/2;
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nkeynes@854 | 67 | x2 -= x1;
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nkeynes@854 | 68 | } else if( ah < video_height ) {
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nkeynes@854 | 69 | y1 = (video_height - ah)/2;
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nkeynes@854 | 70 | y2 -= y1;
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nkeynes@854 | 71 | }
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nkeynes@854 | 72 | if( *x < x1 || *x >= x2 || *y < y1 || *y >= y2 ) {
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nkeynes@854 | 73 | *x = -1;
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nkeynes@854 | 74 | *y = -1;
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nkeynes@854 | 75 | } else {
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nkeynes@854 | 76 | *x = (*x - x1) * DISPLAY_WIDTH / (x2-x1);
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nkeynes@854 | 77 | *y = (*y - y1) * DISPLAY_HEIGHT / (y2-y1);
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nkeynes@854 | 78 | }
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nkeynes@854 | 79 | }
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nkeynes@854 | 80 |
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nkeynes@635 | 81 | void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
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nkeynes@635 | 82 | {
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nkeynes@635 | 83 | float top, bottom;
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nkeynes@635 | 84 | if( inverted ) {
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nkeynes@736 | 85 | top = ((float)height);
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nkeynes@736 | 86 | bottom = 0;
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nkeynes@635 | 87 | } else {
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nkeynes@736 | 88 | top = 0;
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nkeynes@736 | 89 | bottom = ((float)height);
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nkeynes@635 | 90 | }
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nkeynes@635 | 91 |
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nkeynes@635 | 92 | /* Reset display parameters */
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nkeynes@635 | 93 | gl_reset_state();
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nkeynes@635 | 94 | glColor3f( 0,0,0 );
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nkeynes@635 | 95 |
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nkeynes@635 | 96 | int x1=0,y1=0,x2=video_width,y2=video_height;
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nkeynes@635 | 97 |
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nkeynes@635 | 98 | int ah = video_width * 0.75;
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nkeynes@635 | 99 |
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nkeynes@635 | 100 | if( ah > video_height ) {
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nkeynes@736 | 101 | int w = (video_height/0.75);
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nkeynes@736 | 102 | x1 = (video_width - w)/2;
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nkeynes@736 | 103 | x2 -= x1;
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nkeynes@635 | 104 |
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nkeynes@736 | 105 | glBegin( GL_QUADS );
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nkeynes@736 | 106 | glVertex2f( 0, 0 );
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nkeynes@736 | 107 | glVertex2f( x1, 0 );
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nkeynes@736 | 108 | glVertex2f( x1, video_height );
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nkeynes@736 | 109 | glVertex2f( 0, video_height);
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nkeynes@736 | 110 | glVertex2f( x2, 0 );
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nkeynes@736 | 111 | glVertex2f( video_width, 0 );
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nkeynes@736 | 112 | glVertex2f( video_width, video_height );
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nkeynes@736 | 113 | glVertex2f( x2, video_height);
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nkeynes@736 | 114 | glEnd();
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nkeynes@635 | 115 | } else if( ah < video_height ) {
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nkeynes@736 | 116 | y1 = (video_height - ah)/2;
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nkeynes@736 | 117 | y2 -= y1;
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nkeynes@736 | 118 | glBegin( GL_QUADS );
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nkeynes@736 | 119 | glVertex2f( 0, 0 );
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nkeynes@736 | 120 | glVertex2f( video_width, 0 );
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nkeynes@736 | 121 | glVertex2f( video_width, y1 );
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nkeynes@736 | 122 | glVertex2f( 0, y1 );
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nkeynes@736 | 123 | glVertex2f( 0, y2 );
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nkeynes@736 | 124 | glVertex2f( video_width, y2 );
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nkeynes@736 | 125 | glVertex2f( video_width, video_height );
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nkeynes@736 | 126 | glVertex2f( 0, video_height );
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nkeynes@736 | 127 | glEnd();
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nkeynes@635 | 128 | }
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nkeynes@635 | 129 |
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nkeynes@635 | 130 | /* Render the textured rectangle */
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nkeynes@635 | 131 | glEnable( GL_TEXTURE_RECTANGLE_ARB );
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nkeynes@635 | 132 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
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nkeynes@635 | 133 | glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
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nkeynes@635 | 134 | glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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nkeynes@635 | 135 | glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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nkeynes@635 | 136 | glEnable( GL_BLEND );
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nkeynes@635 | 137 | glBlendFunc( GL_ONE, GL_ZERO );
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nkeynes@635 | 138 | glBegin( GL_QUADS );
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nkeynes@635 | 139 | glTexCoord2f( 0, top );
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nkeynes@635 | 140 | glVertex2f( x1, y1 );
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nkeynes@635 | 141 | glTexCoord2f( ((float)width), top );
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nkeynes@635 | 142 | glVertex2f( x2, y1 );
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nkeynes@635 | 143 | glTexCoord2f( ((float)width), bottom );
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nkeynes@635 | 144 | glVertex2f( x2, y2 );
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nkeynes@635 | 145 | glTexCoord2f( 0, bottom );
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nkeynes@635 | 146 | glVertex2f( x1, y2 );
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nkeynes@635 | 147 | glEnd();
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nkeynes@635 | 148 | glDisable( GL_TEXTURE_RECTANGLE_ARB );
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nkeynes@635 | 149 | glFlush();
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nkeynes@635 | 150 | }
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nkeynes@635 | 151 |
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nkeynes@635 | 152 | gboolean gl_load_frame_buffer( frame_buffer_t frame, int tex_id )
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nkeynes@635 | 153 | {
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nkeynes@635 | 154 | GLenum type = colour_formats[frame->colour_format].type;
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nkeynes@635 | 155 | GLenum format = colour_formats[frame->colour_format].format;
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nkeynes@635 | 156 | int bpp = colour_formats[frame->colour_format].bpp;
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nkeynes@635 | 157 | int rowstride = (frame->rowstride / bpp) - frame->width;
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nkeynes@736 | 158 |
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nkeynes@635 | 159 | glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
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nkeynes@635 | 160 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
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nkeynes@635 | 161 | glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
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nkeynes@736 | 162 | frame->width, frame->height, format, type, frame->data );
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nkeynes@635 | 163 | return TRUE;
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nkeynes@635 | 164 | }
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nkeynes@635 | 165 |
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nkeynes@669 | 166 | void gl_display_blank( uint32_t colour )
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nkeynes@635 | 167 | {
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nkeynes@635 | 168 | gl_reset_state();
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nkeynes@635 | 169 | glColor3ub( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
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nkeynes@635 | 170 | glRecti(0,0, video_width, video_height );
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nkeynes@635 | 171 | glFlush();
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nkeynes@635 | 172 | }
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nkeynes@635 | 173 |
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nkeynes@635 | 174 | /**
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nkeynes@635 | 175 | * Generic GL read_render_buffer. This function assumes that the caller
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nkeynes@635 | 176 | * has already set the appropriate glReadBuffer(); in other words, unless
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nkeynes@635 | 177 | * there's only one buffer this needs to be wrapped.
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nkeynes@635 | 178 | */
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nkeynes@635 | 179 | gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer,
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nkeynes@736 | 180 | int rowstride, int colour_format )
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nkeynes@635 | 181 | {
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nkeynes@635 | 182 | glFinish();
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nkeynes@635 | 183 | GLenum type = colour_formats[colour_format].type;
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nkeynes@635 | 184 | GLenum format = colour_formats[colour_format].format;
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nkeynes@635 | 185 | // int line_size = buffer->width * colour_formats[colour_format].bpp;
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nkeynes@635 | 186 | // int size = line_size * buffer->height;
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nkeynes@635 | 187 | int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
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nkeynes@635 | 188 | glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
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nkeynes@736 | 189 |
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nkeynes@635 | 190 | glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
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nkeynes@635 | 191 | return TRUE;
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nkeynes@635 | 192 | }
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