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lxdream.org :: lxdream/src/pvr2/rendcore.c
lxdream 0.9.1
released Jun 29
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filename src/pvr2/rendcore.c
changeset 561:533f6b478071
prev540:a3767018a96d
next635:76c63aac3590
author nkeynes
date Tue Jan 01 05:08:38 2008 +0000 (12 years ago)
branchlxdream-mmu
permissions -rw-r--r--
last change Enable Id keyword on all source files
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     1 /**
     2  * $Id$
     3  *
     4  * PVR2 renderer core.
     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  */
    18 #include <sys/time.h>
    19 #include "pvr2/pvr2.h"
    20 #include "asic.h"
    21 #include "display.h"
    23 int pvr2_poly_depthmode[8] = { GL_NEVER, GL_LESS, GL_EQUAL, GL_LEQUAL,
    24 				      GL_GREATER, GL_NOTEQUAL, GL_GEQUAL, 
    25 				      GL_ALWAYS };
    26 int pvr2_poly_srcblend[8] = { 
    27     GL_ZERO, GL_ONE, GL_DST_COLOR, GL_ONE_MINUS_DST_COLOR,
    28     GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_DST_ALPHA, 
    29     GL_ONE_MINUS_DST_ALPHA };
    30 int pvr2_poly_dstblend[8] = {
    31     GL_ZERO, GL_ONE, GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR,
    32     GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_DST_ALPHA,
    33     GL_ONE_MINUS_DST_ALPHA };
    34 int pvr2_poly_texblend[4] = {
    35     GL_REPLACE, 
    36     GL_MODULATE,  
    37     GL_DECAL, 
    38     GL_MODULATE 
    39 };
    40 int pvr2_render_colour_format[8] = {
    41     COLFMT_BGRA1555, COLFMT_RGB565, COLFMT_BGRA4444, COLFMT_BGRA1555,
    42     COLFMT_BGR888, COLFMT_BGRA8888, COLFMT_BGRA8888, COLFMT_BGRA4444 };
    45 #define CULL_NONE 0
    46 #define CULL_SMALL 1
    47 #define CULL_CCW 2
    48 #define CULL_CW 3
    50 #define SEGMENT_END         0x80000000
    51 #define SEGMENT_ZCLEAR      0x40000000
    52 #define SEGMENT_SORT_TRANS  0x20000000
    53 #define SEGMENT_START       0x10000000
    54 #define SEGMENT_X(c)        (((c) >> 2) & 0x3F)
    55 #define SEGMENT_Y(c)        (((c) >> 8) & 0x3F)
    56 #define NO_POINTER          0x80000000
    58 extern char *video_base;
    60 gboolean pvr2_force_fragment_alpha = FALSE;
    61 gboolean pvr2_debug_render = FALSE;
    63 struct tile_segment {
    64     uint32_t control;
    65     pvraddr_t opaque_ptr;
    66     pvraddr_t opaquemod_ptr;
    67     pvraddr_t trans_ptr;
    68     pvraddr_t transmod_ptr;
    69     pvraddr_t punchout_ptr;
    70 };
    72 void render_print_tilelist( FILE *f, uint32_t tile_entry );
    74 /**
    75  * Convert a half-float (16-bit) FP number to a regular 32-bit float.
    76  * Source is 1-bit sign, 5-bit exponent, 10-bit mantissa.
    77  * TODO: Check the correctness of this.
    78  */
    79 float halftofloat( uint16_t half )
    80 {
    81     union {
    82         float f;
    83         uint32_t i;
    84     } temp;
    85     /* int e = ((half & 0x7C00) >> 10) - 15 + 127;
    87     temp.i = ((half & 0x8000) << 16) | (e << 23) |
    88     ((half & 0x03FF) << 13); */
    89     temp.i = ((uint32_t)half)<<16;
    90     return temp.f;
    91 }
    94 /**
    95  * Setup the GL context for the supplied polygon context.
    96  * @param context pointer to 3 or 5 words of polygon context
    97  * @param modified boolean flag indicating that the modified
    98  *  version should be used, rather than the normal version.
    99  */
   100 void render_set_context( uint32_t *context, int render_mode )
   101 {
   102     uint32_t poly1 = context[0], poly2, texture;
   103     if( render_mode == RENDER_FULLMOD ) {
   104 	poly2 = context[3];
   105 	texture = context[4];
   106     } else {
   107 	poly2 = context[1];
   108 	texture = context[2];
   109     }
   111     if( POLY1_DEPTH_ENABLE(poly1) ) {
   112 	glEnable( GL_DEPTH_TEST );
   113 	glDepthFunc( POLY1_DEPTH_MODE(poly1) );
   114     } else {
   115 	glDisable( GL_DEPTH_TEST );
   116     }
   118     switch( POLY1_CULL_MODE(poly1) ) {
   119     case CULL_NONE:
   120     case CULL_SMALL:
   121 	glDisable( GL_CULL_FACE );
   122 	break;
   123     case CULL_CCW:
   124 	glEnable( GL_CULL_FACE );
   125 	glFrontFace( GL_CW );
   126 	break;
   127     case CULL_CW:
   128 	glEnable( GL_CULL_FACE );
   129 	glFrontFace( GL_CCW );
   130 	break;
   131     }
   133     if( POLY1_SPECULAR(poly1) ) {
   134 	glEnable(GL_COLOR_SUM);
   135     } else {
   136 	glDisable(GL_COLOR_SUM);
   137     }
   139     pvr2_force_fragment_alpha = POLY2_ALPHA_ENABLE(poly2) ? FALSE : TRUE;
   141     if( POLY1_TEXTURED(poly1) ) {
   142 	int width = POLY2_TEX_WIDTH(poly2);
   143 	int height = POLY2_TEX_HEIGHT(poly2);
   144 	glEnable(GL_TEXTURE_2D);
   145 	texcache_get_texture( (texture&0x000FFFFF)<<3, width, height, texture );
   146 	switch( POLY2_TEX_BLEND(poly2) ) {
   147 	case 0: /* Replace */
   148 	    glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
   149 	    break;
   150 	case 2:/* Decal */
   151 	    glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );
   152 	    break;
   153 	case 1: /* Modulate RGB */
   154 	    /* This is not directly supported by opengl (other than by mucking
   155 	     * with the texture format), but we get the same effect by forcing
   156 	     * the fragment alpha to 1.0 and using GL_MODULATE.
   157 	     */
   158 	    pvr2_force_fragment_alpha = TRUE;
   159 	case 3: /* Modulate RGBA */
   160 	    glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
   161 	    break;
   162 	}
   164 	if( POLY2_TEX_CLAMP_U(poly2) ) {
   165 	    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
   166 	} else {
   167 	    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
   168 	}	    
   169 	if( POLY2_TEX_CLAMP_V(poly2) ) {
   170 	    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
   171 	} else {
   172 	    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
   173 	}
   174     } else {
   175 	glDisable( GL_TEXTURE_2D );
   176     }
   178     glShadeModel( POLY1_SHADE_MODEL(poly1) );
   180     int srcblend = POLY2_SRC_BLEND(poly2);
   181     int destblend = POLY2_DEST_BLEND(poly2);
   182     glBlendFunc( srcblend, destblend );
   184     if( POLY2_SRC_BLEND_TARGET(poly2) || POLY2_DEST_BLEND_TARGET(poly2) ) {
   185 	ERROR( "Accumulation buffer not supported" );
   186     }
   189 }
   191 #define FARGB_A(x) (((float)(((x)>>24)+1))/256.0)
   192 #define FARGB_R(x) (((float)((((x)>>16)&0xFF)+1))/256.0)
   193 #define FARGB_G(x) (((float)((((x)>>8)&0xFF)+1))/256.0)
   194 #define FARGB_B(x) (((float)(((x)&0xFF)+1))/256.0)
   196 void render_unpack_vertexes( struct vertex_unpacked *out, uint32_t poly1, 
   197 			     uint32_t *vertexes, int num_vertexes,
   198 			     int vertex_size, int render_mode )
   199 {
   200     int m = 0, i;
   201     if( render_mode == RENDER_FULLMOD ) {
   202 	m = (vertex_size - 3)/2;
   203     }
   205     for( i=0; i<num_vertexes; i++ ) {
   206 	float *vertexf = (float *)vertexes;
   207 	int k = m + 3;
   208 	out[i].x = vertexf[0];
   209 	out[i].y = vertexf[1];
   210 	out[i].z = vertexf[2];
   211     	if( POLY1_TEXTURED(poly1) ) {
   212 	    if( POLY1_UV16(poly1) ) {
   213 		out[i].u = halftofloat(vertexes[k]>>16);
   214 		out[i].v = halftofloat(vertexes[k]);
   215 		k++;
   216 	    } else {
   217 		out[i].u = vertexf[k];
   218 		out[i].v = vertexf[k+1];
   219 		k+=2;
   220 	    }
   221 	} else {
   222 	    out[i].u = 0;
   223 	    out[i].v = 0;
   224 	}
   225 	uint32_t argb = vertexes[k++];
   226 	out[i].rgba[0] = FARGB_R(argb);
   227 	out[i].rgba[1] = FARGB_G(argb);
   228         out[i].rgba[2] = FARGB_B(argb);
   229 	out[i].rgba[3] = FARGB_A(argb);
   230 	if( POLY1_SPECULAR(poly1) ) {
   231 	    uint32_t offset = vertexes[k++];
   232 	    out[i].offset_rgba[0] = FARGB_R(offset);
   233 	    out[i].offset_rgba[1] = FARGB_G(offset);
   234 	    out[i].offset_rgba[2] = FARGB_B(offset);
   235 	    out[i].offset_rgba[3] = FARGB_A(offset);
   236 	}
   237 	vertexes += vertex_size;
   238     }
   239 }
   241 /**
   242  * Unpack the vertexes for a quad, calculating the values for the last
   243  * vertex.
   244  * FIXME: Integrate this with rendbkg somehow
   245  */
   246 void render_unpack_quad( struct vertex_unpacked *unpacked, uint32_t poly1, 
   247 			 uint32_t *vertexes, int vertex_size,
   248 			 int render_mode )
   249 {
   250     int i;
   251     struct vertex_unpacked diff0, diff1;
   253     render_unpack_vertexes( unpacked, poly1, vertexes, 3, vertex_size, render_mode );
   255     diff0.x = unpacked[0].x - unpacked[1].x;
   256     diff0.y = unpacked[0].y - unpacked[1].y;
   257     diff1.x = unpacked[2].x - unpacked[1].x;
   258     diff1.y = unpacked[2].y - unpacked[1].y;
   260     float detxy = ((diff1.y) * (diff0.x)) - ((diff0.y) * (diff1.x));
   261     float *vertexf = (float *)(vertexes+(vertex_size*3));
   262     if( detxy == 0 ) {
   263 	memcpy( &unpacked[3], &unpacked[2], sizeof(struct vertex_unpacked) );
   264 	unpacked[3].x = vertexf[0];
   265 	unpacked[3].y = vertexf[1];
   266 	return;
   267     }	
   269     unpacked[3].x = vertexf[0];
   270     unpacked[3].y = vertexf[1];
   271     float t = ((unpacked[3].x - unpacked[1].x) * diff1.y -
   272 	       (unpacked[3].y - unpacked[1].y) * diff1.x) / detxy;
   273     float s = ((unpacked[3].y - unpacked[1].y) * diff0.x -
   274 	       (unpacked[3].x - unpacked[1].x) * diff0.y) / detxy;
   275     diff0.z = (1/unpacked[0].z) - (1/unpacked[1].z);
   276     diff1.z = (1/unpacked[2].z) - (1/unpacked[1].z);
   277     unpacked[3].z = 1/((1/unpacked[1].z) + (t*diff0.z) + (s*diff1.z));
   279     diff0.u = unpacked[0].u - unpacked[1].u;
   280     diff0.v = unpacked[0].v - unpacked[1].v;
   281     diff1.u = unpacked[2].u - unpacked[1].u;
   282     diff1.v = unpacked[2].v - unpacked[1].v;
   283     unpacked[3].u = unpacked[1].u + (t*diff0.u) + (s*diff1.u);
   284     unpacked[3].v = unpacked[1].v + (t*diff0.v) + (s*diff1.v);
   286     if( !POLY1_GOURAUD_SHADED(poly1) ) {
   287 	memcpy( unpacked[3].rgba, unpacked[2].rgba, sizeof(unpacked[2].rgba) );
   288 	memcpy( unpacked[3].offset_rgba, unpacked[2].offset_rgba, sizeof(unpacked[2].offset_rgba) );
   289     } else {
   290 	for( i=0; i<4; i++ ) {
   291 	    float d0 = unpacked[0].rgba[i] - unpacked[1].rgba[i];
   292 	    float d1 = unpacked[2].rgba[i] - unpacked[1].rgba[i];
   293 	    unpacked[3].rgba[i] = unpacked[1].rgba[i] + (t*d0) + (s*d1);
   294 	    d0 = unpacked[0].offset_rgba[i] - unpacked[1].offset_rgba[i];
   295 	    d1 = unpacked[2].offset_rgba[i] - unpacked[1].offset_rgba[i];
   296 	    unpacked[3].offset_rgba[i] = unpacked[1].offset_rgba[i] + (t*d0) + (s*d1);
   297 	}
   298     }    
   299 }
   301 void render_unpacked_vertex_array( uint32_t poly1, struct vertex_unpacked *vertexes[], 
   302 				   int num_vertexes ) {
   303     int i;
   305     glBegin( GL_TRIANGLE_STRIP );
   307     for( i=0; i<num_vertexes; i++ ) {
   308 	if( POLY1_TEXTURED(poly1) ) {
   309 	    glTexCoord2f( vertexes[i]->u, vertexes[i]->v );
   310 	}
   312 	if( pvr2_force_fragment_alpha ) {
   313 	    glColor4f( vertexes[i]->rgba[0], vertexes[i]->rgba[1], vertexes[i]->rgba[2], 1.0 );
   314 	} else {
   315 	    glColor4f( vertexes[i]->rgba[0], vertexes[i]->rgba[1], vertexes[i]->rgba[2],
   316 		       vertexes[i]->rgba[3] );
   317 	}
   318 	if( POLY1_SPECULAR(poly1) ) {
   319 	    glSecondaryColor3fEXT( vertexes[i]->offset_rgba[0],
   320 				   vertexes[i]->offset_rgba[1],
   321 				   vertexes[i]->offset_rgba[2] );
   322 	}
   323 	glVertex3f( vertexes[i]->x, vertexes[i]->y, 1/vertexes[i]->z );
   324     }
   326     glEnd();
   327 }
   329 void render_quad_vertexes( uint32_t poly1, uint32_t *vertexes, int vertex_size, int render_mode )
   330 {
   331     struct vertex_unpacked unpacked[4];
   332     struct vertex_unpacked *pt[4] = {&unpacked[0], &unpacked[1], &unpacked[3], &unpacked[2]};
   333     render_unpack_quad( unpacked, poly1, vertexes, vertex_size, render_mode );
   334     render_unpacked_vertex_array( poly1, pt, 4 );
   335 }
   337 void render_vertex_array( uint32_t poly1, uint32_t *vert_array[], int num_vertexes, int vertex_size,
   338 			  int render_mode ) 
   339 {
   340     int i, m=0;
   342     if( render_mode == RENDER_FULLMOD ) {
   343 	m = (vertex_size - 3)/2;
   344     }
   346     glBegin( GL_TRIANGLE_STRIP );
   348     for( i=0; i<num_vertexes; i++ ) {
   349 	uint32_t *vertexes = vert_array[i];
   350 	float *vertexf = (float *)vert_array[i];
   351 	uint32_t argb;
   352 	int k = m + 3;
   353 	if( POLY1_TEXTURED(poly1) ) {
   354 	    if( POLY1_UV16(poly1) ) {
   355 		glTexCoord2f( halftofloat(vertexes[k]>>16),
   356 			      halftofloat(vertexes[k]) );
   357 		k++;
   358 	    } else {
   359 		glTexCoord2f( vertexf[k], vertexf[k+1] );
   360 		k+=2;
   361 	    }
   362 	}
   364 	argb = vertexes[k++];
   365 	if( pvr2_force_fragment_alpha ) {
   366 	    glColor4ub( (GLubyte)(argb >> 16), (GLubyte)(argb >> 8), 
   367 			(GLubyte)argb, 0xFF );
   368 	} else {
   369 	    glColor4ub( (GLubyte)(argb >> 16), (GLubyte)(argb >> 8), 
   370 			(GLubyte)argb, (GLubyte)(argb >> 24) );
   371 	}
   373 	if( POLY1_SPECULAR(poly1) ) {
   374 	    uint32_t spec = vertexes[k++];
   375 	    glSecondaryColor3ubEXT( (GLubyte)(spec >> 16), (GLubyte)(spec >> 8), 
   376 				 (GLubyte)spec );
   377 	}
   378 	glVertex3f( vertexf[0], vertexf[1], 1/vertexf[2] );
   379 	vertexes += vertex_size;
   380     }
   382     glEnd();
   383 }
   385 void render_vertexes( uint32_t poly1, uint32_t *vertexes, int num_vertexes, int vertex_size,
   386 		      int render_mode )
   387 {
   388     uint32_t *vert_array[num_vertexes];
   389     int i;
   390     for( i=0; i<num_vertexes; i++ ) {
   391 	vert_array[i] = vertexes;
   392 	vertexes += vertex_size;
   393     }
   394     render_vertex_array( poly1, vert_array, num_vertexes, vertex_size, render_mode );
   395 }
   397 /**
   398  * Render a simple (not auto-sorted) tile
   399  */
   400 void render_tile( pvraddr_t tile_entry, int render_mode, gboolean cheap_modifier_mode ) {
   401     uint32_t poly_bank = MMIO_READ(PVR2,RENDER_POLYBASE);
   402     uint32_t *tile_list = (uint32_t *)(video_base+tile_entry);
   403     do {
   404 	uint32_t entry = *tile_list++;
   405 	if( entry >> 28 == 0x0F ) {
   406 	    break;
   407 	} else if( entry >> 28 == 0x0E ) {
   408 	    tile_list = (uint32_t *)(video_base + (entry&0x007FFFFF));
   409 	} else {
   410 	    uint32_t *polygon = (uint32_t *)(video_base + poly_bank + ((entry & 0x000FFFFF) << 2));
   411 	    int is_modified = entry & 0x01000000;
   412 	    int vertex_length = (entry >> 21) & 0x07;
   413 	    int context_length = 3;
   414 	    if( is_modified && !cheap_modifier_mode ) {
   415 		context_length = 5;
   416 		vertex_length *= 2 ;
   417 	    }
   418 	    vertex_length += 3;
   420 	    if( (entry & 0xE0000000) == 0x80000000 ) {
   421 		/* Triangle(s) */
   422 		int strip_count = ((entry >> 25) & 0x0F)+1;
   423 		int polygon_length = 3 * vertex_length + context_length;
   424 		int i;
   425 		for( i=0; i<strip_count; i++ ) {
   426 		    render_set_context( polygon, render_mode );
   427 		    render_vertexes( *polygon, polygon+context_length, 3, vertex_length,
   428 		    		     render_mode );
   429 		    polygon += polygon_length;
   430 		}
   431 	    } else if( (entry & 0xE0000000) == 0xA0000000 ) {
   432 		/* Sprite(s) */
   433 		int strip_count = ((entry >> 25) & 0x0F)+1;
   434 		int polygon_length = 4 * vertex_length + context_length;
   435 		int i;
   436 		for( i=0; i<strip_count; i++ ) {
   437 		    render_set_context( polygon, render_mode );
   438 		    render_quad_vertexes( *polygon, polygon+context_length, vertex_length,
   439 		    			  render_mode );
   440 		    polygon += polygon_length;
   441 		}
   442 	    } else {
   443 		/* Polygon */
   444 		int i, first=-1, last = -1;
   445 		for( i=0; i<6; i++ ) {
   446 		    if( entry & (0x40000000>>i) ) {
   447 			if( first == -1 ) first = i;
   448 			last = i;
   449 		    }
   450 		}
   451 		if( first != -1 ) {
   452 		    first = 0;
   453 		    render_set_context(polygon, render_mode);
   454 		    render_vertexes( *polygon, polygon+context_length + (first*vertex_length),
   455 		    		     (last-first+3), vertex_length, render_mode );
   456 		}
   457 	    }
   458 	}
   459     } while( 1 );
   460 }
   462 void pvr2_render_tilebuffer( int width, int height, int clipx1, int clipy1, 
   463 			int clipx2, int clipy2 ) {
   465     pvraddr_t segmentbase = MMIO_READ( PVR2, RENDER_TILEBASE );
   466     int tile_sort;
   467     gboolean cheap_shadow;
   469     int obj_config = MMIO_READ( PVR2, RENDER_OBJCFG );
   470     int isp_config = MMIO_READ( PVR2, RENDER_ISPCFG );
   471     int shadow_cfg = MMIO_READ( PVR2, RENDER_SHADOW );
   473     if( (obj_config & 0x00200000) == 0 ) {
   474 	if( isp_config & 1 ) {
   475 	    tile_sort = 0;
   476 	} else {
   477 	    tile_sort = 2;
   478 	}
   479     } else {
   480 	tile_sort = 1;
   481     }
   483     cheap_shadow = shadow_cfg & 0x100 ? TRUE : FALSE;
   485     struct tile_segment *segment = (struct tile_segment *)(video_base + segmentbase);
   487     glEnable( GL_SCISSOR_TEST );
   488     do {
   489 	// fwrite_dump32v( (uint32_t *)segment, sizeof(struct tile_segment), 6, stderr );
   490 	int tilex = SEGMENT_X(segment->control);
   491 	int tiley = SEGMENT_Y(segment->control);
   493 	int x1 = tilex << 5;
   494 	int y1 = tiley << 5;
   495 	if( x1 + 32 <= clipx1 ||
   496 	    y1 + 32 <= clipy1 ||
   497 	    x1 >= clipx2 ||
   498 	    y1 >= clipy2 ) {
   499 	    /* Tile completely clipped, skip */
   500 	    continue;
   501 	}
   503 	/* Set a scissor on the visible part of the tile */
   504 	int w = MIN(x1+32, clipx2) - x1;
   505 	int h = MIN(y1+32, clipy2) - y1;
   506 	x1 = MAX(x1,clipx1);
   507 	y1 = MAX(y1,clipy1);
   508 	glScissor( x1, height-y1-h, w, h );
   510 	if( (segment->opaque_ptr & NO_POINTER) == 0 ) {
   511 	    if( pvr2_debug_render ) {
   512 		fprintf( stderr, "Tile %d,%d Opaque\n", tilex, tiley );
   513 		render_print_tilelist( stderr, segment->opaque_ptr );
   514 	    }
   515 	    if( (segment->opaquemod_ptr & NO_POINTER) == 0 ) {
   516 		/* TODO */
   517 	    }
   518 	    render_tile( segment->opaque_ptr, RENDER_NORMAL, cheap_shadow );
   519 	}
   521 	if( (segment->trans_ptr & NO_POINTER) == 0 ) {
   522 	    if( pvr2_debug_render ) {
   523 		fprintf( stderr, "Tile %d,%d Trans\n", tilex, tiley );
   524 		render_print_tilelist( stderr, segment->trans_ptr );
   525 	    }
   526 	    if( (segment->transmod_ptr & NO_POINTER) == 0 ) {
   527 		/* TODO */
   528 	    } 
   529 	    if( tile_sort == 2 || 
   530 		(tile_sort == 1 && ((segment->control & SEGMENT_SORT_TRANS)==0)) ) {
   531 		render_autosort_tile( segment->trans_ptr, RENDER_NORMAL, cheap_shadow );
   532 	    } else {
   533 		render_tile( segment->trans_ptr, RENDER_NORMAL, cheap_shadow );
   534 	    }
   535 	}
   537 	if( (segment->punchout_ptr & NO_POINTER) == 0 ) {
   538 	    if( pvr2_debug_render ) {
   539 		fprintf( stderr, "Tile %d,%d Punchout\n", tilex, tiley );
   540 		render_print_tilelist( stderr, segment->punchout_ptr );
   541 	    }
   542 	    render_tile( segment->punchout_ptr, RENDER_NORMAL, cheap_shadow );
   543 	}
   544     } while( ((segment++)->control & SEGMENT_END) == 0 );
   545     glDisable( GL_SCISSOR_TEST );
   546 }
   548 static float render_find_maximum_tile_z( pvraddr_t tile_entry, float inputz )
   549 {
   550     uint32_t poly_bank = MMIO_READ(PVR2,RENDER_POLYBASE);
   551     uint32_t *tile_list = (uint32_t *)(video_base+tile_entry);
   552     int shadow_cfg = MMIO_READ( PVR2, RENDER_SHADOW ) & 0x100;
   553     int i, j;
   554     float z = inputz;
   555     do {
   556 	uint32_t entry = *tile_list++;
   557 	if( entry >> 28 == 0x0F ) {
   558 	    break;
   559 	} else if( entry >> 28 == 0x0E ) {
   560 	    tile_list = (uint32_t *)(video_base + (entry&0x007FFFFF));
   561 	} else {
   562 	    uint32_t *polygon = (uint32_t *)(video_base + poly_bank + ((entry & 0x000FFFFF) << 2));
   563 	    int vertex_length = (entry >> 21) & 0x07;
   564 	    int context_length = 3;
   565 	    if( (entry & 0x01000000) && (shadow_cfg==0) ) {
   566 		context_length = 5;
   567 		vertex_length *= 2 ;
   568 	    }
   569 	    vertex_length += 3;
   570 	    if( (entry & 0xE0000000) == 0x80000000 ) {
   571 		/* Triangle(s) */
   572 		int strip_count = ((entry >> 25) & 0x0F)+1;
   573 		float *vertexz = (float *)(polygon+context_length+2);
   574 		for( i=0; i<strip_count; i++ ) {
   575 		    for( j=0; j<3; j++ ) {
   576 			if( *vertexz > z ) {
   577 			    z = *vertexz;
   578 			}
   579 			vertexz += vertex_length;
   580 		    }
   581 		    vertexz += context_length;
   582 		}
   583 	    } else if( (entry & 0xE0000000) == 0xA0000000 ) {
   584 		/* Sprite(s) */
   585 		int strip_count = ((entry >> 25) & 0x0F)+1;
   586 		int i;
   587 		float *vertexz = (float *)(polygon+context_length+2);
   588 		for( i=0; i<strip_count; i++ ) {
   589 		    for( j=0; j<4; j++ ) {
   590 			if( *vertexz > z ) {
   591 			    z = *vertexz;
   592 			}
   593 			vertexz += vertex_length;
   594 		    }
   595 		    vertexz+=context_length;
   596 		}
   597 	    } else {
   598 		/* Polygon */
   599 		int i;
   600 		float *vertexz = (float *)polygon+context_length+2;
   601 		for( i=0; i<6; i++ ) {
   602 		    if( (entry & (0x40000000>>i)) && *vertexz > z ) {
   603 			z = *vertexz;
   604 		    }
   605 		    vertexz += vertex_length;
   606 		}
   607 	    }
   608 	}
   609     } while(1);
   610     return z;
   611 }
   613 /**
   614  * Scan through the scene to determine the largest z value (in order to set up
   615  * an appropriate near clip plane).
   616  */
   617 float pvr2_render_find_maximum_z( )
   618 {
   619     pvraddr_t segmentbase = MMIO_READ( PVR2, RENDER_TILEBASE );
   620     float maximumz = MMIO_READF( PVR2, RENDER_FARCLIP ); /* Initialize to the far clip plane */
   622     struct tile_segment *segment = (struct tile_segment *)(video_base + segmentbase);
   623     do {
   625 	if( (segment->opaque_ptr & NO_POINTER) == 0 ) {
   626 	    maximumz = render_find_maximum_tile_z(segment->opaque_ptr, maximumz);
   627 	}
   628 	if( (segment->opaquemod_ptr & NO_POINTER) == 0 ) {
   629 	    maximumz = render_find_maximum_tile_z(segment->opaquemod_ptr, maximumz);
   630 	}
   631 	if( (segment->trans_ptr & NO_POINTER) == 0 ) {
   632 	    maximumz = render_find_maximum_tile_z(segment->trans_ptr, maximumz);
   633 	}
   634 	if( (segment->transmod_ptr & NO_POINTER) == 0 ) {
   635 	    maximumz = render_find_maximum_tile_z(segment->transmod_ptr, maximumz);
   636 	}
   637 	if( (segment->punchout_ptr & NO_POINTER) == 0 ) {
   638 	    maximumz = render_find_maximum_tile_z(segment->punchout_ptr, maximumz);
   639 	}
   641     } while( ((segment++)->control & SEGMENT_END) == 0 );
   643     return 1/maximumz;
   644 }
   646 /**
   647  * Scan the segment info to determine the width and height of the render (in 
   648  * pixels).
   649  * @param x,y output values to receive the width and height info.
   650  */
   651 void pvr2_render_getsize( int *x, int *y ) 
   652 {
   653     pvraddr_t segmentbase = MMIO_READ( PVR2, RENDER_TILEBASE );
   654     int maxx = 0, maxy = 0;
   656     struct tile_segment *segment = (struct tile_segment *)(video_base + segmentbase);
   657     do {
   658 	int tilex = SEGMENT_X(segment->control);
   659 	int tiley = SEGMENT_Y(segment->control);
   660 	if( tilex > maxx ) {
   661 	    maxx = tilex;
   662 	} 
   663 	if( tiley > maxy ) {
   664 	    maxy = tiley;
   665 	}
   666     } while( ((segment++)->control & SEGMENT_END) == 0 );
   668     *x = (maxx+1)<<5;
   669     *y = (maxy+1)<<5;
   670 }
   672 void render_print_vertexes( FILE *f, uint32_t poly1, uint32_t *vert_array[], 
   673 			    int num_vertexes, int vertex_size )
   674 {
   675     char buf[256], *p;
   676     int i, k;
   677     for( i=0; i<num_vertexes; i++ ) {
   678 	p = buf;
   679 	float *vertf = (float *)vert_array[i];
   680 	uint32_t *verti = (uint32_t *)vert_array[i];
   681 	p += sprintf( p, "  V %9.5f,%9.5f,%9.5f  ", vertf[0], vertf[1], vertf[2] );
   682 	k = 3;
   683 	if( POLY1_TEXTURED(poly1) ) {
   684 	    if( POLY1_UV16(poly1) ) {
   685 		p += sprintf( p, "uv=%9.5f,%9.5f  ",
   686 			       halftofloat(verti[k]>>16),
   687 			       halftofloat(verti[k]) );
   688 		k++;
   689 	    } else {
   690 		p += sprintf( p, "uv=%9.5f,%9.5f  ", vertf[k], vertf[k+1] );
   691 		k+=2;
   692 	    }
   693 	}
   695 	p += sprintf( p, "%08X ", verti[k++] );
   696 	if( POLY1_SPECULAR(poly1) ) {
   697 	    p += sprintf( p, "%08X", verti[k++] );
   698 	}
   699 	p += sprintf( p, "\n" );
   700 	fprintf( f, buf );
   701     }
   702 }
   704 void render_print_polygon( FILE *f, uint32_t entry )
   705 {
   706     uint32_t poly_bank = MMIO_READ(PVR2,RENDER_POLYBASE);
   707     int shadow_cfg = MMIO_READ( PVR2, RENDER_SHADOW ) & 0x100;
   708     int i;
   710     if( entry >> 28 == 0x0F ) {
   711 	fprintf( f, "EOT\n" );
   712     } else if( entry >> 28 == 0x0E ) {
   713 	fprintf( f, "LINK %08X\n", entry &0x7FFFFF );
   714     } else {
   715 	uint32_t *polygon = (uint32_t *)(video_base + poly_bank + ((entry & 0x000FFFFF) << 2));
   716 	int vertex_length = (entry >> 21) & 0x07;
   717 	int context_length = 3;
   718 	if( (entry & 0x01000000) && (shadow_cfg==0) ) {
   719 	    context_length = 5;
   720 	    vertex_length *= 2 ;
   721 	}
   722 	vertex_length += 3;
   723 	if( (entry & 0xE0000000) == 0x80000000 ) {
   724 	    /* Triangle(s) */
   725 	    int strip_count = ((entry >> 25) & 0x0F)+1;
   726 	    for( i=0; i<strip_count; i++ ) {
   727 		fprintf( f, "TRI  %08X %08X %08X\n", polygon[0], polygon[1], polygon[2] ); 
   728 		uint32_t *array[3];
   729 		array[0] = polygon + context_length;
   730 		array[1] = array[0] + vertex_length;
   731 		array[2] = array[1] + vertex_length;
   732 		render_print_vertexes( f, *polygon, array, 3, vertex_length );
   733 		polygon = array[2] + vertex_length;
   734 	    }
   735 	} else if( (entry & 0xE0000000) == 0xA0000000 ) {
   736 	    /* Sprite(s) */
   737 	    int strip_count = ((entry >> 25) & 0x0F)+1;
   738 	    for( i=0; i<strip_count; i++ ) {
   739 		fprintf( f, "QUAD %08X %08X %08X\n", polygon[0], polygon[1], polygon[2] ); 
   740 		uint32_t *array[4];
   741 		array[0] = polygon + context_length;
   742 		array[1] = array[0] + vertex_length;
   743 		array[2] = array[1] + vertex_length;
   744 		array[3] = array[2] + vertex_length;
   745 		render_print_vertexes( f, *polygon, array, 4, vertex_length );
   746 		polygon = array[3] + vertex_length;
   747 	    }
   748 	} else {
   749 	    /* Polygon */
   750 	    int last = -1;
   751 	    uint32_t *array[8];
   752 	    for( i=0; i<6; i++ ) {
   753 		if( entry & (0x40000000>>i) ) {
   754 		    last = i;
   755 		}
   756 	    }
   757 	    fprintf( f, "POLY %08X %08X %08X\n", polygon[0], polygon[1], polygon[2] );
   758 	    for( i=0; i<last+2; i++ ) {
   759 		array[i] = polygon + context_length + vertex_length*i;
   760 	    }
   761 	    render_print_vertexes( f, *polygon, array, last+2, vertex_length );
   762 	}
   763     }
   764 }
   766 void render_print_tilelist( FILE *f, uint32_t tile_entry )
   767 {
   768     uint32_t *tile_list = (uint32_t *)(video_base+tile_entry);
   769     do {
   770 	uint32_t entry = *tile_list++;
   771 	if( entry >> 28 == 0x0F ) {
   772 	    break;
   773 	} else if( entry >> 28 == 0x0E ) {
   774 	    tile_list = (uint32_t *)(video_base + (entry&0x007FFFFF));
   775 	} else {
   776 	    render_print_polygon(f, entry);
   777 	}
   778     } while( 1 );
   779 }
.