Search
lxdream.org :: lxdream/src/drivers/video_gl.c
lxdream 0.9.1
released Jun 29
Download Now
filename src/drivers/video_gl.c
changeset 736:a02d1475ccfd
prev681:1755a126b109
next854:130928a3cdcb
author nkeynes
date Mon Jul 14 07:44:42 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Re-indent everything consistently
Fix include guards for consistency as well
view annotate diff log raw
     1 /**
     2  * $Id$
     3  *
     4  * Common GL code that doesn't depend on a specific implementation
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #include <sys/time.h>
    21 #include "display.h"
    22 #include "pvr2/pvr2.h"
    23 #include "drivers/video_gl.h"
    25 extern uint32_t video_width, video_height;
    27 /**
    28  * Reset the gl state to simple orthographic projection with 
    29  * texturing, alpha/depth/scissor/cull tests disabled.
    30  */
    31 void gl_reset_state()
    32 {
    33     glViewport( 0, 0, video_width, video_height );
    34     glMatrixMode(GL_PROJECTION);
    35     glLoadIdentity();
    36     glOrtho( 0, video_width, video_height, 0, 0, 65535 );
    37     glMatrixMode(GL_MODELVIEW);
    38     glLoadIdentity();
    39     glEnable( GL_BLEND );
    40     glDisable( GL_TEXTURE_2D );
    41     glDisable( GL_TEXTURE_RECTANGLE_ARB );
    42     glDisable( GL_ALPHA_TEST );
    43     glDisable( GL_DEPTH_TEST );
    44     glDisable( GL_SCISSOR_TEST );
    45     glDisable( GL_CULL_FACE );
    46     glDrawBuffer( GL_FRONT );
    47 }
    49 void gl_display_render_buffer( render_buffer_t buffer )
    50 {
    51     gl_texture_window( buffer->width, buffer->height, buffer->buf_id, buffer->inverted );
    52 }
    54 void gl_texture_window( int width, int height, int tex_id, gboolean inverted )
    55 {
    56     float top, bottom;
    57     if( inverted ) {
    58         top = ((float)height);
    59         bottom = 0;
    60     } else {
    61         top = 0;
    62         bottom = ((float)height);
    63     }
    65     /* Reset display parameters */
    66     gl_reset_state();
    67     glColor3f( 0,0,0 );    
    69     int x1=0,y1=0,x2=video_width,y2=video_height;
    71     int ah = video_width * 0.75;
    73     if( ah > video_height ) {
    74         int w = (video_height/0.75);
    75         x1 = (video_width - w)/2;
    76         x2 -= x1;
    78         glBegin( GL_QUADS );
    79         glVertex2f( 0, 0 );
    80         glVertex2f( x1, 0 );
    81         glVertex2f( x1, video_height );
    82         glVertex2f( 0, video_height);
    83         glVertex2f( x2, 0 );
    84         glVertex2f( video_width, 0 );
    85         glVertex2f( video_width, video_height );
    86         glVertex2f( x2, video_height);
    87         glEnd();
    88     } else if( ah < video_height ) {
    89         y1 = (video_height - ah)/2;
    90         y2 -= y1;
    91         glBegin( GL_QUADS );
    92         glVertex2f( 0, 0 );
    93         glVertex2f( video_width, 0 );
    94         glVertex2f( video_width, y1 );
    95         glVertex2f( 0, y1 );
    96         glVertex2f( 0, y2 );
    97         glVertex2f( video_width, y2 );
    98         glVertex2f( video_width, video_height );
    99         glVertex2f( 0, video_height );
   100         glEnd();
   101     }
   103     /* Render the textured rectangle */
   104     glEnable( GL_TEXTURE_RECTANGLE_ARB );
   105     glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
   106     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
   107     glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   108     glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   109     glEnable( GL_BLEND );
   110     glBlendFunc( GL_ONE, GL_ZERO );
   111     glBegin( GL_QUADS );
   112     glTexCoord2f( 0, top );
   113     glVertex2f( x1, y1 );
   114     glTexCoord2f( ((float)width), top );
   115     glVertex2f( x2, y1 );
   116     glTexCoord2f( ((float)width), bottom );
   117     glVertex2f( x2, y2 );
   118     glTexCoord2f( 0, bottom );
   119     glVertex2f( x1, y2 );
   120     glEnd();
   121     glDisable( GL_TEXTURE_RECTANGLE_ARB );
   122     glFlush();
   123 }
   125 gboolean gl_load_frame_buffer( frame_buffer_t frame, int tex_id )
   126 {
   127     GLenum type = colour_formats[frame->colour_format].type;
   128     GLenum format = colour_formats[frame->colour_format].format;
   129     int bpp = colour_formats[frame->colour_format].bpp;
   130     int rowstride = (frame->rowstride / bpp) - frame->width;
   132     glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
   133     glBindTexture( GL_TEXTURE_RECTANGLE_ARB, tex_id );
   134     glTexSubImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, 0,0,
   135                      frame->width, frame->height, format, type, frame->data );
   136     return TRUE;
   137 }
   139 void gl_display_blank( uint32_t colour )
   140 {
   141     gl_reset_state();
   142     glColor3ub( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );
   143     glRecti(0,0, video_width, video_height );
   144     glFlush();
   145 }
   147 /**
   148  * Generic GL read_render_buffer. This function assumes that the caller
   149  * has already set the appropriate glReadBuffer(); in other words, unless
   150  * there's only one buffer this needs to be wrapped.
   151  */
   152 gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer, 
   153                                 int rowstride, int colour_format ) 
   154 {
   155     glFinish();
   156     GLenum type = colour_formats[colour_format].type;
   157     GLenum format = colour_formats[colour_format].format;
   158     // int line_size = buffer->width * colour_formats[colour_format].bpp;
   159     // int size = line_size * buffer->height;
   160     int glrowstride = (rowstride / colour_formats[colour_format].bpp) - buffer->width;
   161     glPixelStorei( GL_PACK_ROW_LENGTH, glrowstride );
   163     glReadPixels( 0, 0, buffer->width, buffer->height, format, type, target );
   164     return TRUE;
   165 }
.