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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 268:1ba7e5a7a3f7
prev223:f6c28fa9076b
next286:0fa5aae66f31
author nkeynes
date Wed Jan 10 08:38:02 2007 +0000 (13 years ago)
permissions -rw-r--r--
last change Fix last tile not actually being rendered
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     1 /**
     2  * $Id: rendcore.c,v 1.7 2007-01-10 08:38:02 nkeynes Exp $
     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"
    22 int pvr2_poly_depthmode[8] = { GL_NEVER, GL_LESS, GL_EQUAL, GL_LEQUAL,
    23 				      GL_GREATER, GL_NOTEQUAL, GL_GEQUAL, 
    24 				      GL_ALWAYS };
    25 int pvr2_poly_srcblend[8] = { 
    26     GL_ZERO, GL_ONE, GL_DST_COLOR, GL_ONE_MINUS_DST_COLOR,
    27     GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_DST_ALPHA, 
    28     GL_ONE_MINUS_DST_ALPHA };
    29 int pvr2_poly_dstblend[8] = {
    30     GL_ZERO, GL_ONE, GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR,
    31     GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_DST_ALPHA,
    32     GL_ONE_MINUS_DST_ALPHA };
    33 int pvr2_poly_texblend[4] = {
    34     GL_REPLACE, GL_BLEND, GL_DECAL, GL_MODULATE };
    35 int pvr2_render_colour_format[8] = {
    36     COLFMT_ARGB1555, COLFMT_RGB565, COLFMT_ARGB4444, COLFMT_ARGB1555,
    37     COLFMT_RGB888, COLFMT_ARGB8888, COLFMT_ARGB8888, COLFMT_ARGB4444 };
    40 #define CULL_NONE 0
    41 #define CULL_SMALL 1
    42 #define CULL_CCW 2
    43 #define CULL_CW 3
    45 #define SEGMENT_END         0x80000000
    46 #define SEGMENT_SORT_TRANS  0x20000000
    47 #define SEGMENT_START       0x10000000
    48 #define SEGMENT_X(c)        (((c) >> 2) & 0x3F)
    49 #define SEGMENT_Y(c)        (((c) >> 8) & 0x3F)
    50 #define NO_POINTER          0x80000000
    52 extern char *video_base;
    54 struct tile_segment {
    55     uint32_t control;
    56     pvraddr_t opaque_ptr;
    57     pvraddr_t opaquemod_ptr;
    58     pvraddr_t trans_ptr;
    59     pvraddr_t transmod_ptr;
    60     pvraddr_t punchout_ptr;
    61 };
    63 /**
    64  * Convert a half-float (16-bit) FP number to a regular 32-bit float.
    65  * Source is 1-bit sign, 5-bit exponent, 10-bit mantissa.
    66  * TODO: Check the correctness of this.
    67  */
    68 float halftofloat( uint16_t half )
    69 {
    70     union {
    71         float f;
    72         uint32_t i;
    73     } temp;
    74     int e = ((half & 0x7C00) >> 10) - 15 + 127;
    76     temp.i = ((half & 0x8000) << 16) | (e << 23) |
    77              ((half & 0x03FF) << 13);
    78     return temp.f;
    79 }
    82 /**
    83  * Setup the GL context for the supplied polygon context.
    84  * @param context pointer to 3 or 5 words of polygon context
    85  * @param modified boolean flag indicating that the modified
    86  *  version should be used, rather than the normal version.
    87  */
    88 void render_set_context( uint32_t *context, int render_mode )
    89 {
    90     uint32_t poly1 = context[0], poly2, texture;
    91     if( render_mode == RENDER_FULLMOD ) {
    92 	poly2 = context[3];
    93 	texture = context[4];
    94     } else {
    95 	poly2 = context[1];
    96 	texture = context[2];
    97     }
    99     if( POLY1_DEPTH_ENABLE(poly1) ) {
   100 	glEnable( GL_DEPTH_TEST );
   101 	glDepthFunc( POLY1_DEPTH_MODE(poly1) );
   102     } else {
   103 	glDisable( GL_DEPTH_TEST );
   104     }
   106     switch( POLY1_CULL_MODE(poly1) ) {
   107     case CULL_NONE:
   108     case CULL_SMALL:
   109 	glDisable( GL_CULL_FACE );
   110 	break;
   111     case CULL_CCW:
   112 	glEnable( GL_CULL_FACE );
   113 	glFrontFace( GL_CW );
   114 	break;
   115     case CULL_CW:
   116 	glEnable( GL_CULL_FACE );
   117 	glFrontFace( GL_CCW );
   118 	break;
   119     }
   121     if( POLY1_TEXTURED(poly1) ) {
   122 	int width = POLY2_TEX_WIDTH(poly2);
   123 	int height = POLY2_TEX_HEIGHT(poly2);
   124 	glEnable(GL_TEXTURE_2D);
   125 	texcache_get_texture( (texture&0x001FFFFF)<<3, width, height, texture );
   126 	glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, POLY2_TEX_BLEND(poly2) );
   127     } else {
   128 	glDisable( GL_TEXTURE_2D );
   129     }
   131     glShadeModel( POLY1_SHADE_MODEL(poly1) );
   133     int srcblend = POLY2_SRC_BLEND(poly2);
   134     int destblend = POLY2_DEST_BLEND(poly2);
   135     glBlendFunc( srcblend, destblend );
   136     if( POLY2_TEX_ALPHA_ENABLE(poly2) ) {
   137 	glEnable(GL_BLEND);
   138     } else {
   139 	glDisable(GL_BLEND);
   140     }
   141 }
   143 void render_vertexes( uint32_t poly1, uint32_t *vertexes, int num_vertexes, int vertex_size,
   144 		      int render_mode ) 
   145 {
   146     int i, m=0;
   148     if( render_mode == RENDER_FULLMOD ) {
   149 	m = (vertex_size - 3)/2;
   150     }
   152     glBegin( GL_TRIANGLE_STRIP );
   154     for( i=0; i<num_vertexes; i++ ) {
   155 	float *vertexf = (float *)vertexes;
   156 	uint32_t argb;
   157 	if( POLY1_TEXTURED(poly1) ) {
   158 	    if( POLY1_UV16(poly1) ) {
   159 		glTexCoord2f( halftofloat(vertexes[m+3]>>16),
   160 			      halftofloat(vertexes[m+3]) );
   161 		argb = vertexes[m+4];
   162 	    } else {
   163 		glTexCoord2f( vertexf[m+3], vertexf[m+4] );
   164 		argb = vertexes[m+5];
   165 	    }
   166 	} else {
   167 	    argb = vertexes[m+3];
   168 	}
   170 	glColor4ub( (GLubyte)(argb >> 16), (GLubyte)(argb >> 8), 
   171 		    (GLubyte)argb, (GLubyte)(argb >> 24) );
   172 	glVertex3f( vertexf[0], vertexf[1], vertexf[2] );
   173 	vertexes += vertex_size;
   174     }
   176     glEnd();
   177 }
   179 /**
   180  * Render a simple (not auto-sorted) tile
   181  */
   182 void render_tile( pvraddr_t tile_entry, int render_mode, gboolean cheap_modifier_mode ) {
   183     uint32_t poly_bank = MMIO_READ(PVR2,RENDER_POLYBASE);
   184     uint32_t *tile_list = (uint32_t *)(video_base+tile_entry);
   185     do {
   186 	uint32_t entry = *tile_list++;
   187 	if( entry >> 28 == 0x0F ) {
   188 	    break;
   189 	} else if( entry >> 28 == 0x0E ) {
   190 	    tile_list = (uint32_t *)(video_base + (entry&0x007FFFFF));
   191 	} else {
   192 	    uint32_t *polygon = (uint32_t *)(video_base + poly_bank + ((entry & 0x000FFFFF) << 2));
   193 	    int is_modified = entry & 0x01000000;
   194 	    int vertex_length = (entry >> 21) & 0x07;
   195 	    int context_length = 3;
   196 	    if( is_modified && !cheap_modifier_mode ) {
   197 		context_length = 5;
   198 		vertex_length *= 2 ;
   199 	    }
   200 	    vertex_length += 3;
   202 	    if( (entry & 0xE0000000) == 0x80000000 ) {
   203 		/* Triangle(s) */
   204 		int strip_count = ((entry >> 25) & 0x0F)+1;
   205 		int polygon_length = 3 * vertex_length + context_length;
   206 		int i;
   207 		for( i=0; i<strip_count; i++ ) {
   208 		    render_set_context( polygon, render_mode );
   209 		    render_vertexes( *polygon, polygon+context_length, 3, vertex_length,
   210 				     render_mode );
   211 		    polygon += polygon_length;
   212 		}
   213 	    } else if( (entry & 0xE0000000) == 0xA0000000 ) {
   214 		/* Sprite(s) */
   215 		int strip_count = (entry >> 25) & 0x0F;
   216 		int polygon_length = 4 * vertex_length + context_length;
   217 		int i;
   218 		for( i=0; i<strip_count; i++ ) {
   219 		    render_set_context( polygon, render_mode );
   220 		    render_vertexes( *polygon, polygon+context_length, 4, vertex_length,
   221 				     render_mode );
   222 		    polygon += polygon_length;
   223 		}
   224 	    } else {
   225 		/* Polygon */
   226 		int i, first=-1, last = -1;
   227 		for( i=0; i<6; i++ ) {
   228 		    if( entry & (0x40000000>>i) ) {
   229 			if( first == -1 ) first = i;
   230 			last = i;
   231 		    }
   232 		}
   233 		if( first != -1 ) {
   234 		    first = 0;
   235 		    render_set_context(polygon, render_mode);
   236 		    render_vertexes( *polygon, polygon+context_length + (first*vertex_length),
   237 				     (last-first+3), vertex_length, render_mode );
   238 		}
   239 	    }
   240 	}
   241     } while( 1 );
   242 }
   244 void pvr2_render_tilebuffer( int width, int height, int clipx1, int clipy1, 
   245 			int clipx2, int clipy2 ) {
   247     pvraddr_t segmentbase = MMIO_READ( PVR2, RENDER_TILEBASE );
   248     int tile_sort;
   249     gboolean cheap_shadow;
   251     int obj_config = MMIO_READ( PVR2, RENDER_OBJCFG );
   252     int isp_config = MMIO_READ( PVR2, RENDER_ISPCFG );
   253     int shadow_cfg = MMIO_READ( PVR2, RENDER_SHADOW );
   255     if( (obj_config & 0x00200000) == 0 ) {
   256 	if( isp_config & 1 ) {
   257 	    tile_sort = 0;
   258 	} else {
   259 	    tile_sort = 2;
   260 	}
   261     } else {
   262 	tile_sort = 1;
   263     }
   265     cheap_shadow = shadow_cfg & 0x100 ? TRUE : FALSE;
   267     struct tile_segment *segment = (struct tile_segment *)(video_base + segmentbase);
   269     struct timeval tv_start, tv_end;
   270     gettimeofday(&tv_start, NULL);
   271     glEnable( GL_SCISSOR_TEST );
   272     do {
   273 	// fwrite_dump32v( (uint32_t *)segment, sizeof(struct tile_segment), 6, stderr );
   274 	int tilex = SEGMENT_X(segment->control);
   275 	int tiley = SEGMENT_Y(segment->control);
   277 	int x1 = tilex << 5;
   278 	int y1 = tiley << 5;
   279 	if( x1 + 32 <= clipx1 ||
   280 	    y1 + 32 <= clipy1 ||
   281 	    x1 >= clipx2 ||
   282 	    y1 >= clipy2 ) {
   283 	    /* Tile completely clipped, skip */
   284 	    continue;
   285 	}
   287 	/* Set a scissor on the visible part of the tile */
   288 	int w = MIN(x1+32, clipx2) - x1;
   289 	int h = MIN(y1+32, clipy2) - y1;
   290 	x1 = MAX(x1,clipx1);
   291 	y1 = MAX(y1,clipy1);
   292 	glScissor( x1, height-y1-h, w, h );
   294 	if( (segment->opaque_ptr & NO_POINTER) == 0 ) {
   295 	    if( (segment->opaquemod_ptr & NO_POINTER) == 0 ) {
   296 		/* TODO */
   297 	    }
   298 	    render_tile( segment->opaque_ptr, RENDER_NORMAL, cheap_shadow );
   299 	}
   301 	if( (segment->trans_ptr & NO_POINTER) == 0 ) {
   302 	    if( (segment->transmod_ptr & NO_POINTER) == 0 ) {
   303 		/* TODO */
   304 	    } 
   305 	    if( tile_sort == 2 || 
   306 		(tile_sort == 1 && ((segment->control & SEGMENT_SORT_TRANS)==0)) ) {
   307 		render_autosort_tile( segment->trans_ptr, RENDER_NORMAL, cheap_shadow );
   308 	    } else {
   309 		render_tile( segment->trans_ptr, RENDER_NORMAL, cheap_shadow );
   310 	    }
   311 	}
   313 	if( (segment->punchout_ptr & NO_POINTER) == 0 ) {
   314 	    render_tile( segment->punchout_ptr, RENDER_NORMAL, cheap_shadow );
   315 	}
   316     } while( ((segment++)->control & SEGMENT_END) == 0 );
   317     glDisable( GL_SCISSOR_TEST );
   319     gettimeofday(&tv_end, NULL);
   320     timersub(&tv_end,&tv_start, &tv_start);
   321 }
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