Search
lxdream.org :: lxdream/src/drivers/gl_common.c :: diff
Latest Version
lxdream 0.9.1
released Jun 29
Download Now
Navigation
News Download Mailing Lists Mercurial Issues Dreamcast Wiki FAQ Forums
tree revision 443:1163eb5c0590
Jump to:
summary | tree | shortlog | changelog | graph | changeset

 

filename src/drivers/gl_common.c
changeset 443:1163eb5c0590
prev429:e581b90c3fb3
next444:74c38d57eb11
author nkeynes
date Sat Oct 13 04:01:02 2007 +0000 (16 years ago)
permissions -rw-r--r--
last change Add ability to track the last displayed buffer, and handle expose/resize
events appropriately
file annotate diff log raw 
     1.1 --- a/src/drivers/gl_common.c	Mon Oct 08 11:52:13 2007 +0000

     1.2 +++ b/src/drivers/gl_common.c	Sat Oct 13 04:01:02 2007 +0000

     1.3 @@ -1,5 +1,5 @@

     1.4  /**

     1.5 - * $Id: gl_common.c,v 1.3 2007-10-08 11:49:35 nkeynes Exp $

     1.6 + * $Id: gl_common.c,v 1.4 2007-10-13 04:01:02 nkeynes Exp $

     1.7   *

     1.8   * Common GL code that doesn't depend on a specific implementation

     1.9   *

    1.10 @@ -16,11 +16,20 @@

    1.11   * GNU General Public License for more details.

    1.12   */

    1.13  

    1.14 +#include <sys/time.h>

    1.15 +

    1.16  #include <GL/gl.h>

    1.17  #include "dream.h"

    1.18  #include "drivers/gl_common.h"

    1.19  

    1.20  extern uint32_t video_width, video_height;

    1.21 +static GLuint frame_last_texid = 0, fbuf_id = 0;

    1.22 +static uint32_t frame_width = 0;

    1.23 +static uint32_t frame_height = 0;

    1.24 +static uint32_t frame_colour = 0;

    1.25 +static gboolean frame_inverted = FALSE;

    1.26 +

    1.27 +

    1.28  

    1.29  char *required_extensions[] = { "GL_EXT_framebuffer_object", NULL };

    1.30  

    1.31 @@ -71,55 +80,76 @@

    1.32      return isOK;

    1.33  }

    1.34  

    1.35 -

    1.36 -gboolean gl_display_frame_buffer( frame_buffer_t frame )

    1.37 +void gl_frame_buffer_to_tex_rectangle( frame_buffer_t frame, GLuint texid )

    1.38  {

    1.39      GLenum type = colour_formats[frame->colour_format].type;

    1.40      GLenum format = colour_formats[frame->colour_format].format;

    1.41      int bpp = colour_formats[frame->colour_format].bpp;

    1.42 +    int rowstride = (frame->rowstride / bpp) - frame->width;

    1.43 +    

    1.44 +    glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );

    1.45 +    glBindTexture( GL_TEXTURE_RECTANGLE_ARB, texid );

    1.46 +    glTexImage2D( GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGB,

    1.47 +		  frame->width, frame->height, 0, format, type, frame->data );

    1.48 +}

    1.49  

    1.50 +void gl_display_tex_rectangle( GLuint texid, uint32_t tex_width, uint32_t tex_height, gboolean invert )

    1.51 +{

    1.52 +    float top, bottom;

    1.53 +    if( invert ) {

    1.54 +	top = ((float)tex_height) - 0.5;

    1.55 +	bottom = 0.5;

    1.56 +    } else {

    1.57 +	top = 0.5;

    1.58 +	bottom = ((float)tex_height) - 0.5;

    1.59 +    }

    1.60 +

    1.61 +    /* Reset display parameters */

    1.62      glViewport( 0, 0, video_width, video_height );

    1.63      glMatrixMode(GL_PROJECTION);

    1.64      glLoadIdentity();

    1.65      glOrtho( 0, video_width, video_height, 0, 0, -65535 );

    1.66      glMatrixMode(GL_MODELVIEW);

    1.67      glLoadIdentity();

    1.68 -    

    1.69 -    /* Disable everything */

    1.70      glDisable( GL_TEXTURE_2D );

    1.71      glDisable( GL_ALPHA_TEST );

    1.72      glDisable( GL_DEPTH_TEST );

    1.73      glDisable( GL_SCISSOR_TEST );

    1.74      glDisable( GL_CULL_FACE );

    1.75  

    1.76 -    float scale = ((float)video_height) / frame->height;

    1.77 -    int rowstride = (frame->rowstride / bpp) - frame->width;

    1.78 -    

    1.79 -    

    1.80 -    /*

    1.81 -    glGenTextures( 1, &texid );

    1.82 -    glBindTexture( GL_TEXTURE_2D, texid );

    1.83 -    glTexImage2D( GL_TEXTURE_2D, 0, colour_formats[frame->colour_format].int_format,

    1.84 -		  frame->width, frame->height, 0, format, type, frame->data );

    1.85 +    /* Render the textured rectangle */

    1.86 +    glEnable( GL_TEXTURE_RECTANGLE_ARB );

    1.87 +    glBindTexture( GL_TEXTURE_RECTANGLE_ARB, texid );

    1.88 +    glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );

    1.89 +    glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    1.90 +    glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    1.91 +    glEnable( GL_BLEND );

    1.92 +    glBlendFunc( GL_ONE, GL_ZERO );

    1.93      glBegin( GL_QUADS );

    1.94 -    glTexCoord2i( 0, 1.0 );

    1.95 +    glTexCoord2f( 0.5, top );

    1.96      glVertex2f( 0.0, 0.0 );

    1.97 -    glTexCoord2i( 1.0, 1.0 );

    1.98 -    glVertex2f( frame->width, 0.0 );

    1.99 -    glTexCoord2i( 1.0, 0.0 );

   1.100 -    glVertex2f( frame->width, frame->height );

   1.101 -    glTexCoord2i( 0, 0.0 );

   1.102 -    glVertex2f( 0.0, frame->height );

   1.103 +    glTexCoord2f( ((float)tex_width)-0.5, top );

   1.104 +    glVertex2f( video_width, 0.0 );

   1.105 +    glTexCoord2f( ((float)tex_width)-0.5, bottom );

   1.106 +    glVertex2f( video_width, video_height );

   1.107 +    glTexCoord2f( 0.5, bottom );

   1.108 +    glVertex2f( 0.0, video_height );

   1.109      glEnd();

   1.110 -    glDeleteTextures( 1, &texid );

   1.111 -    */

   1.112 -    glRasterPos2i( 0, 0 );

   1.113 -    glPixelZoom( 1.0f, -scale );

   1.114 -    glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );

   1.115 -    glDrawPixels( frame->width, frame->height, format, type,

   1.116 -		  frame->data );

   1.117 -    

   1.118 +    glDisable( GL_TEXTURE_RECTANGLE_ARB );

   1.119      glFlush();

   1.120 +    frame_last_texid = texid;

   1.121 +    frame_width = tex_width;

   1.122 +    frame_height = tex_height;

   1.123 +    frame_inverted = invert;

   1.124 +}

   1.125 +

   1.126 +gboolean gl_display_frame_buffer( frame_buffer_t frame )

   1.127 +{

   1.128 +    if( fbuf_id == 0 ) {

   1.129 +	glGenTextures( 1, &fbuf_id );

   1.130 +    }

   1.131 +    gl_frame_buffer_to_tex_rectangle( frame, fbuf_id );

   1.132 +    gl_display_tex_rectangle( fbuf_id, frame->width, frame->height, FALSE );

   1.133      return TRUE;

   1.134  }

   1.135  

   1.136 @@ -134,9 +164,20 @@

   1.137      glColor3b( (colour >> 16) & 0xFF, (colour >> 8) & 0xFF, colour & 0xFF );

   1.138      glRecti(0,0, video_width, video_height );

   1.139      glFlush();

   1.140 +    frame_colour = colour;

   1.141 +    frame_last_texid = 0;

   1.142      return TRUE;

   1.143  }

   1.144  

   1.145 +void gl_redisplay_last()

   1.146 +{

   1.147 +    if( frame_last_texid == 0 ) {

   1.148 +	gl_display_blank( frame_colour );

   1.149 +    } else {

   1.150 +	gl_display_tex_rectangle( frame_last_texid, frame_width, frame_height, frame_inverted );

   1.151 +    }

   1.152 +}

   1.153 +

   1.154  /**

   1.155   * Generic GL read_render_buffer. This function assumes that the caller

   1.156   * has already set the appropriate glReadBuffer(); in other words, unless
.