Search
lxdream.org :: lxdream/src/pvr2/render.c
lxdream 0.9.1
released Jun 29
Download Now
filename src/pvr2/render.c
changeset 352:f0df7a6d4703
prev338:8c68d9097846
next429:e581b90c3fb3
author nkeynes
date Sun Feb 11 10:09:32 2007 +0000 (12 years ago)
permissions -rw-r--r--
last change Bug 27: Implement opengl framebuffer objects
Rewrite much of the final video output stage. Now uses generic "render
buffers", implemented on GL using framebuffer objects + textures.
view annotate diff log raw
     1 /**
     2  * $Id: render.c,v 1.24 2007-02-11 10:09:32 nkeynes Exp $
     3  *
     4  * PVR2 Renderer support. This part is primarily
     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 "pvr2/pvr2.h"
    20 #include "asic.h"
    23 int pvr2_render_font_list = -1;
    24 int pvr2_render_trace = 0;
    26 int glPrintf( int x, int y, const char *fmt, ... )
    27 {
    28     va_list ap;     /* our argument pointer */
    29     char buf[256];
    30     int len;
    31     if (fmt == NULL)    /* if there is no string to draw do nothing */
    32         return;
    33     va_start(ap, fmt); 
    34     len = vsnprintf(buf, sizeof(buf), fmt, ap);
    35     va_end(ap);
    38     glPushAttrib(GL_LIST_BIT);
    39     glDisable( GL_DEPTH_TEST );
    40     glDisable( GL_BLEND );
    41     glDisable( GL_TEXTURE_2D );
    42     glDisable( GL_ALPHA_TEST );
    43     glDisable( GL_CULL_FACE );
    44     glListBase(pvr2_render_font_list - 32);
    45     glColor3f( 1.0, 1.0, 1.0 );
    46     glRasterPos2i( x, y );
    47     glCallLists(len, GL_UNSIGNED_BYTE, buf);
    48     glPopAttrib();
    50     return len;
    51 }
    53 void glDrawGrid( int width, int height )
    54 {
    55     int i;
    56     glDisable( GL_DEPTH_TEST );
    57     glLineWidth(1);
    59     glBegin( GL_LINES );
    60     glColor4f( 1.0, 1.0, 1.0, 1.0 );
    61     for( i=32; i<width; i+=32 ) {
    62 	glVertex3f( i, 0.0, 3.0 );
    63 	glVertex3f( i,height-1, 3.0 );
    64     }
    66     for( i=32; i<height; i+=32 ) {
    67 	glVertex3f( 0.0, i, 3.0 );
    68 	glVertex3f( width, i, 3.0 );
    69     }
    70     glEnd();
    72 }
    74 /**
    75  * Prepare the OpenGL context to receive instructions for a new frame.
    76  */
    77 static void pvr2_render_prepare_context( render_buffer_t buffer,
    78 					 float bgplanez, float nearz ) 
    79 {
    80     /* Select and initialize the render context */
    81     display_driver->set_render_target(buffer);
    83     if( pvr2_render_font_list == -1 ) {
    84 	pvr2_render_font_list = video_glx_load_font( "-*-helvetica-*-r-normal--16-*-*-*-p-*-iso8859-1");
    85     }
    87     pvr2_check_palette_changed();
    89     /* Setup the display model */
    90     glShadeModel(GL_SMOOTH);
    91     glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
    92     glMatrixMode(GL_PROJECTION);
    93     glLoadIdentity();
    94     glOrtho( 0, buffer->width, buffer->height, 0, -bgplanez, -nearz );
    95     glMatrixMode(GL_MODELVIEW);
    96     glLoadIdentity();
    97     glCullFace( GL_BACK );
    98     glEnable( GL_BLEND );
   100     /* Clear out the buffers */
   101     glDisable( GL_SCISSOR_TEST );
   102     glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
   103     glClearDepth(0);
   104     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
   105 }
   107 /**
   108  * Render a complete scene into the OpenGL back buffer.
   109  * Note: this will probably need to be broken up eventually once timings are
   110  * determined.
   111  */
   112 void pvr2_render_scene( render_buffer_t buffer )
   113 {
   114     struct tile_descriptor *tile_desc =
   115 	(struct tile_descriptor *)mem_get_region(PVR2_RAM_BASE + MMIO_READ( PVR2, RENDER_TILEBASE ));
   117     float bgplanez = 1/MMIO_READF( PVR2, RENDER_FARCLIP );
   118     pvr2_render_prepare_context( buffer, bgplanez, 0 );
   120     int clip_x = MMIO_READ( PVR2, RENDER_HCLIP ) & 0x03FF;
   121     int clip_y = MMIO_READ( PVR2, RENDER_VCLIP ) & 0x03FF;
   122     int clip_width = ((MMIO_READ( PVR2, RENDER_HCLIP ) >> 16) & 0x03FF) - clip_x + 1;
   123     int clip_height= ((MMIO_READ( PVR2, RENDER_VCLIP ) >> 16) & 0x03FF) - clip_y + 1;
   125     /* Fog setup goes here? */
   127     /* Render the background plane */
   129     uint32_t bgplane_mode = MMIO_READ(PVR2, RENDER_BGPLANE);
   130     uint32_t *display_list = 
   131 	(uint32_t *)mem_get_region(PVR2_RAM_BASE + MMIO_READ( PVR2, RENDER_POLYBASE ));
   133     uint32_t *bgplane = display_list + (((bgplane_mode & 0x00FFFFFF)) >> 3) ;
   134     render_backplane( bgplane, buffer->width, buffer->height, bgplane_mode );
   136     pvr2_render_tilebuffer( buffer->width, buffer->height, clip_x, clip_y, 
   137 			    clip_x + clip_width, clip_y + clip_height );
   139     DEBUG( "Rendered frame %d to %08X", pvr2_get_frame_count(), buffer->address );
   140 }
.