nkeynes@352 | 1 | /**
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nkeynes@561 | 2 | * $Id$
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nkeynes@352 | 3 | *
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nkeynes@352 | 4 | * GL framebuffer-based driver shell. This requires the EXT_framebuffer_object
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nkeynes@352 | 5 | * extension, but is much nicer/faster/etc than pbuffers when it's available.
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nkeynes@352 | 6 | * This is (optionally) used indirectly by the top-level GLX driver.
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nkeynes@352 | 7 | *
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nkeynes@352 | 8 | * Strategy-wise, we maintain 2 framebuffers with up to 4 target colour
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nkeynes@352 | 9 | * buffers a piece. Effectively this reserves one fb for display output,
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nkeynes@352 | 10 | * and the other for texture output (each fb has a single size).
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nkeynes@352 | 11 | *
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nkeynes@352 | 12 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@352 | 13 | *
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nkeynes@352 | 14 | * This program is free software; you can redistribute it and/or modify
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nkeynes@352 | 15 | * it under the terms of the GNU General Public License as published by
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nkeynes@352 | 16 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@352 | 17 | * (at your option) any later version.
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nkeynes@352 | 18 | *
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nkeynes@352 | 19 | * This program is distributed in the hope that it will be useful,
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nkeynes@352 | 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@352 | 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@352 | 22 | * GNU General Public License for more details.
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nkeynes@352 | 23 | */
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nkeynes@352 | 24 |
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nkeynes@424 | 25 | #define GL_GLEXT_PROTOTYPES 1
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nkeynes@424 | 26 |
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nkeynes@477 | 27 | #include <stdlib.h>
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nkeynes@477 | 28 | #include "lxdream.h"
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nkeynes@352 | 29 | #include "display.h"
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nkeynes@635 | 30 | #include "drivers/video_gl.h"
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nkeynes@635 | 31 | #include "pvr2/glutil.h"
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nkeynes@352 | 32 |
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nkeynes@656 | 33 | #ifdef HAVE_OPENGL_FBO
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nkeynes@656 | 34 |
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nkeynes@352 | 35 | #define MAX_FRAMEBUFFERS 2
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nkeynes@798 | 36 | #define MAX_TEXTURES_PER_FB 16
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nkeynes@352 | 37 |
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nkeynes@352 | 38 | static render_buffer_t gl_fbo_create_render_buffer( uint32_t width, uint32_t height );
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nkeynes@352 | 39 | static void gl_fbo_destroy_render_buffer( render_buffer_t buffer );
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nkeynes@352 | 40 | static gboolean gl_fbo_set_render_target( render_buffer_t buffer );
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nkeynes@669 | 41 | static void gl_fbo_display_render_buffer( render_buffer_t buffer );
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nkeynes@477 | 42 | static void gl_fbo_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer );
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nkeynes@669 | 43 | static void gl_fbo_display_blank( uint32_t colour );
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nkeynes@477 | 44 | static gboolean gl_fbo_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format );
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nkeynes@352 | 45 |
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nkeynes@352 | 46 | extern uint32_t video_width, video_height;
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nkeynes@352 | 47 |
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nkeynes@352 | 48 | /**
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nkeynes@352 | 49 | * Framebuffer info structure
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nkeynes@352 | 50 | */
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nkeynes@352 | 51 | struct gl_fbo_info {
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nkeynes@352 | 52 | GLuint fb_id;
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nkeynes@352 | 53 | GLuint depth_id;
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nkeynes@352 | 54 | GLuint stencil_id;
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nkeynes@352 | 55 | GLuint tex_ids[MAX_TEXTURES_PER_FB];
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nkeynes@352 | 56 | int width, height;
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nkeynes@352 | 57 | };
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nkeynes@352 | 58 |
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nkeynes@798 | 59 | static GLint gl_fbo_max_attachments = 0;
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nkeynes@352 | 60 | static struct gl_fbo_info fbo[MAX_FRAMEBUFFERS];
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nkeynes@798 | 61 |
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nkeynes@798 | 62 | #define ATTACHMENT_POINT(n) (GL_COLOR_ATTACHMENT0_EXT+(n))
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nkeynes@352 | 63 | static int last_used_fbo;
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nkeynes@352 | 64 |
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nkeynes@352 | 65 | gboolean gl_fbo_is_supported()
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nkeynes@352 | 66 | {
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nkeynes@352 | 67 | return isGLExtensionSupported("GL_EXT_framebuffer_object");
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nkeynes@352 | 68 | }
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nkeynes@352 | 69 |
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nkeynes@352 | 70 | /**
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nkeynes@352 | 71 | * Construct the initial frame buffers and allocate ids for everything.
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nkeynes@352 | 72 | * The render handling driver methods are set to the fbo versions.
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nkeynes@352 | 73 | */
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nkeynes@352 | 74 | void gl_fbo_init( display_driver_t driver )
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nkeynes@352 | 75 | {
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nkeynes@352 | 76 | int i,j;
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nkeynes@424 | 77 | GLuint fbids[MAX_FRAMEBUFFERS];
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nkeynes@424 | 78 | GLuint rbids[MAX_FRAMEBUFFERS*2]; /* depth buffer, stencil buffer per fb */
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nkeynes@736 | 79 |
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nkeynes@798 | 80 | glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &gl_fbo_max_attachments);
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nkeynes@424 | 81 | glGenFramebuffersEXT( MAX_FRAMEBUFFERS, &fbids[0] );
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nkeynes@424 | 82 | glGenRenderbuffersEXT( MAX_FRAMEBUFFERS*2, &rbids[0] );
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nkeynes@352 | 83 | for( i=0; i<MAX_FRAMEBUFFERS; i++ ) {
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nkeynes@736 | 84 | fbo[i].fb_id = fbids[i];
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nkeynes@736 | 85 | fbo[i].depth_id = rbids[i*2];
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nkeynes@736 | 86 | fbo[i].stencil_id = rbids[i*2+1];
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nkeynes@736 | 87 | fbo[i].width = -1;
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nkeynes@736 | 88 | fbo[i].height = -1;
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nkeynes@736 | 89 | for( j=0; j<MAX_TEXTURES_PER_FB; j++ ) {
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nkeynes@736 | 90 | fbo[i].tex_ids[j] = -1;
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nkeynes@736 | 91 | }
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nkeynes@352 | 92 | }
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nkeynes@352 | 93 | last_used_fbo = 0;
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nkeynes@352 | 94 |
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nkeynes@352 | 95 | driver->create_render_buffer = gl_fbo_create_render_buffer;
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nkeynes@352 | 96 | driver->destroy_render_buffer = gl_fbo_destroy_render_buffer;
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nkeynes@352 | 97 | driver->set_render_target = gl_fbo_set_render_target;
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nkeynes@352 | 98 | driver->display_render_buffer = gl_fbo_display_render_buffer;
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nkeynes@477 | 99 | driver->load_frame_buffer = gl_fbo_load_frame_buffer;
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nkeynes@352 | 100 | driver->display_blank = gl_fbo_display_blank;
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nkeynes@352 | 101 | driver->read_render_buffer = gl_fbo_read_render_buffer;
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nkeynes@445 | 102 |
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nkeynes@445 | 103 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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nkeynes@445 | 104 | glDrawBuffer(GL_FRONT);
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nkeynes@445 | 105 | glReadBuffer(GL_FRONT);
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nkeynes@352 | 106 | }
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nkeynes@352 | 107 |
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nkeynes@352 | 108 | void gl_fbo_shutdown()
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nkeynes@352 | 109 | {
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nkeynes@352 | 110 | int i;
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nkeynes@352 | 111 | glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
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nkeynes@352 | 112 | for( i=0; i<MAX_FRAMEBUFFERS; i++ ) {
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nkeynes@736 | 113 | glDeleteFramebuffersEXT( 1, &fbo[i].fb_id );
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nkeynes@736 | 114 | glDeleteRenderbuffersEXT( 2, &fbo[i].depth_id );
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nkeynes@352 | 115 | }
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nkeynes@352 | 116 | }
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nkeynes@352 | 117 |
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nkeynes@352 | 118 | void gl_fbo_setup_framebuffer( int bufno, int width, int height )
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nkeynes@352 | 119 | {
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nkeynes@352 | 120 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo[bufno].fb_id);
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nkeynes@352 | 121 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fbo[bufno].depth_id);
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nkeynes@352 | 122 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, width, height);
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nkeynes@352 | 123 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
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nkeynes@736 | 124 | GL_RENDERBUFFER_EXT, fbo[bufno].depth_id);
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nkeynes@352 | 125 | /* Stencil doesn't work on ATI, and we're not using it at the moment anyway, so...
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nkeynes@352 | 126 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fbo[bufno].stencil_id);
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nkeynes@352 | 127 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX, width, height);
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nkeynes@352 | 128 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
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nkeynes@352 | 129 | GL_RENDERBUFFER_EXT, fbo[bufno].stencil_id);
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nkeynes@736 | 130 | */
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nkeynes@352 | 131 | fbo[bufno].width = width;
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nkeynes@352 | 132 | fbo[bufno].height = height;
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nkeynes@352 | 133 | }
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nkeynes@352 | 134 |
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nkeynes@352 | 135 | int gl_fbo_get_framebuffer( int width, int height )
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nkeynes@352 | 136 | {
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nkeynes@352 | 137 | int bufno = -1, i;
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nkeynes@352 | 138 | /* find a compatible framebuffer context */
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nkeynes@352 | 139 | for( i=0; i<MAX_FRAMEBUFFERS; i++ ) {
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nkeynes@736 | 140 | if( fbo[i].width == -1 && bufno == -1 ) {
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nkeynes@736 | 141 | bufno = i;
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nkeynes@736 | 142 | } else if( fbo[i].width == width && fbo[i].height == height ) {
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nkeynes@736 | 143 | bufno = i;
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nkeynes@736 | 144 | break;
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nkeynes@736 | 145 | }
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nkeynes@352 | 146 | }
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nkeynes@352 | 147 | if( bufno == -1 ) {
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nkeynes@736 | 148 | bufno = last_used_fbo + 1;
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nkeynes@736 | 149 | if( bufno > MAX_FRAMEBUFFERS ) {
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nkeynes@736 | 150 | bufno = 0;
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nkeynes@736 | 151 | }
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nkeynes@736 | 152 | last_used_fbo = bufno;
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nkeynes@352 | 153 | }
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nkeynes@352 | 154 | if( fbo[bufno].width == width && fbo[bufno].height == height ) {
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nkeynes@736 | 155 | glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, fbo[bufno].fb_id );
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nkeynes@352 | 156 | } else {
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nkeynes@736 | 157 | gl_fbo_setup_framebuffer( bufno, width, height );
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nkeynes@352 | 158 | }
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nkeynes@352 | 159 | return bufno;
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nkeynes@352 | 160 | }
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nkeynes@352 | 161 |
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nkeynes@352 | 162 | /**
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nkeynes@352 | 163 | * Attach a texture to the framebuffer. The texture must already be initialized
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nkeynes@352 | 164 | * to the correct dimensions etc.
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nkeynes@352 | 165 | */
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nkeynes@352 | 166 | static GLint gl_fbo_attach_texture( int fbo_no, GLint tex_id ) {
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nkeynes@352 | 167 | int attach = -1, i;
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nkeynes@798 | 168 | for( i=0; i<gl_fbo_max_attachments; i++ ) {
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nkeynes@736 | 169 | if( fbo[fbo_no].tex_ids[i] == tex_id ) {
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nkeynes@798 | 170 | glDrawBuffer(ATTACHMENT_POINT(i));
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nkeynes@798 | 171 | glReadBuffer(ATTACHMENT_POINT(i));
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nkeynes@798 | 172 | return ATTACHMENT_POINT(i); // already attached
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nkeynes@736 | 173 | } else if( fbo[fbo_no].tex_ids[i] == -1 && attach == -1 ) {
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nkeynes@736 | 174 | attach = i;
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nkeynes@736 | 175 | }
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nkeynes@352 | 176 | }
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nkeynes@352 | 177 | if( attach == -1 ) {
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nkeynes@736 | 178 | attach = 0;
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nkeynes@352 | 179 | }
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nkeynes@352 | 180 | fbo[fbo_no].tex_ids[attach] = tex_id;
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nkeynes@352 | 181 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, 0 ); // Ensure the output texture is unbound
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nkeynes@798 | 182 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, ATTACHMENT_POINT(attach),
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nkeynes@736 | 183 | GL_TEXTURE_RECTANGLE_ARB, tex_id, 0 );
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nkeynes@352 | 184 | /* Set draw/read buffers by default */
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nkeynes@798 | 185 | glDrawBuffer(ATTACHMENT_POINT(attach));
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nkeynes@798 | 186 | glReadBuffer(ATTACHMENT_POINT(attach));
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nkeynes@352 | 187 |
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nkeynes@352 | 188 |
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nkeynes@352 | 189 | GLint status = glGetError();
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nkeynes@352 | 190 | if( status != GL_NO_ERROR ) {
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nkeynes@736 | 191 | ERROR( "GL error setting render target (%x)!", status );
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nkeynes@352 | 192 | }
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nkeynes@352 | 193 | status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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nkeynes@352 | 194 | if( status != GL_FRAMEBUFFER_COMPLETE_EXT ) {
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nkeynes@736 | 195 | ERROR( "Framebuffer failure: %x", status );
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nkeynes@736 | 196 | exit(1);
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nkeynes@352 | 197 | }
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nkeynes@352 | 198 |
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nkeynes@798 | 199 | return ATTACHMENT_POINT(attach);
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nkeynes@352 | 200 | }
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nkeynes@352 | 201 |
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nkeynes@352 | 202 | static render_buffer_t gl_fbo_create_render_buffer( uint32_t width, uint32_t height )
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nkeynes@352 | 203 | {
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nkeynes@758 | 204 | GLuint tex;
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nkeynes@352 | 205 | render_buffer_t buffer = calloc( sizeof(struct render_buffer), 1 );
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nkeynes@352 | 206 | buffer->width = width;
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nkeynes@352 | 207 | buffer->height = height;
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nkeynes@758 | 208 | glGenTextures( 1, &tex );
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nkeynes@758 | 209 | buffer->buf_id = tex;
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nkeynes@758 | 210 | glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex );
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nkeynes@352 | 211 | glTexParameteri( GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP );
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nkeynes@352 | 212 | glTexParameteri( GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP );
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nkeynes@352 | 213 | glTexParameteri( GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
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nkeynes@352 | 214 | glTexParameteri( GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
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nkeynes@352 | 215 | glTexImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL );
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nkeynes@352 | 216 | return buffer;
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nkeynes@352 | 217 | }
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nkeynes@352 | 218 |
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nkeynes@352 | 219 | static void gl_fbo_destroy_render_buffer( render_buffer_t buffer )
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nkeynes@352 | 220 | {
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nkeynes@352 | 221 | int i,j;
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nkeynes@758 | 222 | GLuint tex = buffer->buf_id;
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nkeynes@352 | 223 | for( i=0; i<MAX_FRAMEBUFFERS; i++ ) {
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nkeynes@736 | 224 | for( j=0; j < MAX_TEXTURES_PER_FB; j++ ) {
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nkeynes@736 | 225 | if( fbo[i].tex_ids[j] == buffer->buf_id ) {
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nkeynes@736 | 226 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo[i].fb_id);
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nkeynes@798 | 227 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, ATTACHMENT_POINT(j),
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nkeynes@736 | 228 | GL_TEXTURE_RECTANGLE_ARB, GL_NONE, 0 );
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nkeynes@736 | 229 | fbo[i].tex_ids[j] = -1;
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nkeynes@736 | 230 | }
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nkeynes@736 | 231 | }
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nkeynes@352 | 232 | }
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nkeynes@736 | 233 |
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nkeynes@758 | 234 | glDeleteTextures( 1, &tex );
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nkeynes@352 | 235 | buffer->buf_id = 0;
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nkeynes@352 | 236 | free( buffer );
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nkeynes@352 | 237 | }
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nkeynes@352 | 238 |
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nkeynes@352 | 239 | static gboolean gl_fbo_set_render_target( render_buffer_t buffer )
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nkeynes@352 | 240 | {
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nkeynes@477 | 241 | glFinish();
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nkeynes@352 | 242 | glGetError();
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nkeynes@352 | 243 | int fb = gl_fbo_get_framebuffer( buffer->width, buffer->height );
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nkeynes@424 | 244 | gl_fbo_attach_texture( fb, buffer->buf_id );
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nkeynes@352 | 245 | /* setup the gl context */
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nkeynes@352 | 246 | glViewport( 0, 0, buffer->width, buffer->height );
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nkeynes@736 | 247 |
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nkeynes@352 | 248 | return TRUE;
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nkeynes@352 | 249 | }
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nkeynes@352 | 250 |
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nkeynes@352 | 251 | /**
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nkeynes@352 | 252 | * Render the texture holding the given buffer to the front window
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nkeynes@352 | 253 | * buffer.
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nkeynes@352 | 254 | */
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nkeynes@669 | 255 | static void gl_fbo_display_render_buffer( render_buffer_t buffer )
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nkeynes@352 | 256 | {
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nkeynes@352 | 257 | glFinish();
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nkeynes@477 | 258 | gl_fbo_detach();
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nkeynes@477 | 259 | gl_display_render_buffer( buffer );
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nkeynes@352 | 260 | }
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nkeynes@352 | 261 |
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nkeynes@477 | 262 | static void gl_fbo_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
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nkeynes@477 | 263 | {
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nkeynes@477 | 264 | glFinish();
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nkeynes@477 | 265 | gl_fbo_detach();
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nkeynes@545 | 266 | gl_load_frame_buffer( frame, buffer->buf_id );
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nkeynes@477 | 267 | }
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nkeynes@477 | 268 |
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nkeynes@669 | 269 | static void gl_fbo_display_blank( uint32_t colour )
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nkeynes@477 | 270 | {
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nkeynes@477 | 271 | glFinish();
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nkeynes@477 | 272 | gl_fbo_detach();
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nkeynes@669 | 273 | gl_display_blank( colour );
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nkeynes@477 | 274 | }
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nkeynes@477 | 275 |
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nkeynes@477 | 276 | void gl_fbo_detach()
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nkeynes@352 | 277 | {
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nkeynes@352 | 278 | glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 );
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nkeynes@352 | 279 | glDrawBuffer( GL_FRONT );
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nkeynes@352 | 280 | glReadBuffer( GL_FRONT );
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nkeynes@477 | 281 | }
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nkeynes@352 | 282 |
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nkeynes@477 | 283 | static gboolean gl_fbo_read_render_buffer( unsigned char *target, render_buffer_t buffer,
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nkeynes@736 | 284 | int rowstride, int format )
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nkeynes@352 | 285 | {
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nkeynes@352 | 286 | int fb = gl_fbo_get_framebuffer( buffer->width, buffer->height );
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nkeynes@424 | 287 | gl_fbo_attach_texture( fb, buffer->buf_id );
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nkeynes@477 | 288 | return gl_read_render_buffer( target, buffer, rowstride, format );
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nkeynes@352 | 289 | }
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nkeynes@352 | 290 |
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nkeynes@656 | 291 | #else
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nkeynes@656 | 292 | gboolean gl_fbo_is_supported()
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nkeynes@656 | 293 | {
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nkeynes@656 | 294 | return FALSE;
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nkeynes@656 | 295 | }
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nkeynes@656 | 296 |
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nkeynes@656 | 297 | void gl_fbo_init( display_driver_t driver )
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nkeynes@656 | 298 | {
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nkeynes@656 | 299 | }
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nkeynes@656 | 300 |
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nkeynes@656 | 301 | #endif
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