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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 308:10a5b5475fb0
prev298:44d94dd0e8aa
next318:363935d31859
author nkeynes
date Sun Jan 21 11:28:43 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Enable blend by default - remove toggle on tex-alpha bit as its just plain
wrong
Implement UV clamping
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     1 /**
     2  * $Id: rendcore.c,v 1.10 2007-01-21 11:28:43 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_MODULATE, 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_ZCLEAR      0x40000000
    47 #define SEGMENT_SORT_TRANS  0x20000000
    48 #define SEGMENT_START       0x10000000
    49 #define SEGMENT_X(c)        (((c) >> 2) & 0x3F)
    50 #define SEGMENT_Y(c)        (((c) >> 8) & 0x3F)
    51 #define NO_POINTER          0x80000000
    53 extern char *video_base;
    55 struct tile_segment {
    56     uint32_t control;
    57     pvraddr_t opaque_ptr;
    58     pvraddr_t opaquemod_ptr;
    59     pvraddr_t trans_ptr;
    60     pvraddr_t transmod_ptr;
    61     pvraddr_t punchout_ptr;
    62 };
    64 /**
    65  * Convert a half-float (16-bit) FP number to a regular 32-bit float.
    66  * Source is 1-bit sign, 5-bit exponent, 10-bit mantissa.
    67  * TODO: Check the correctness of this.
    68  */
    69 float halftofloat( uint16_t half )
    70 {
    71     union {
    72         float f;
    73         uint32_t i;
    74     } temp;
    75     /* int e = ((half & 0x7C00) >> 10) - 15 + 127;
    77     temp.i = ((half & 0x8000) << 16) | (e << 23) |
    78     ((half & 0x03FF) << 13); */
    79     temp.i = ((uint32_t)half)<<16;
    80     return temp.f;
    81 }
    84 /**
    85  * Setup the GL context for the supplied polygon context.
    86  * @param context pointer to 3 or 5 words of polygon context
    87  * @param modified boolean flag indicating that the modified
    88  *  version should be used, rather than the normal version.
    89  */
    90 void render_set_context( uint32_t *context, int render_mode )
    91 {
    92     uint32_t poly1 = context[0], poly2, texture;
    93     if( render_mode == RENDER_FULLMOD ) {
    94 	poly2 = context[3];
    95 	texture = context[4];
    96     } else {
    97 	poly2 = context[1];
    98 	texture = context[2];
    99     }
   101     if( POLY1_DEPTH_ENABLE(poly1) ) {
   102 	glEnable( GL_DEPTH_TEST );
   103 	glDepthFunc( POLY1_DEPTH_MODE(poly1) );
   104     } else {
   105 	glDisable( GL_DEPTH_TEST );
   106     }
   108     switch( POLY1_CULL_MODE(poly1) ) {
   109     case CULL_NONE:
   110     case CULL_SMALL:
   111 	glDisable( GL_CULL_FACE );
   112 	break;
   113     case CULL_CCW:
   114 	glEnable( GL_CULL_FACE );
   115 	glFrontFace( GL_CW );
   116 	break;
   117     case CULL_CW:
   118 	glEnable( GL_CULL_FACE );
   119 	glFrontFace( GL_CCW );
   120 	break;
   121     }
   123     if( POLY1_TEXTURED(poly1) ) {
   124 	int width = POLY2_TEX_WIDTH(poly2);
   125 	int height = POLY2_TEX_HEIGHT(poly2);
   126 	glEnable(GL_TEXTURE_2D);
   127 	texcache_get_texture( (texture&0x000FFFFF)<<3, width, height, texture );
   128 	glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, POLY2_TEX_BLEND(poly2) );
   129 	if( POLY2_TEX_CLAMP_U(poly2) ) {
   130 	    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
   131 	} else {
   132 	    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
   133 	}	    
   134 	if( POLY2_TEX_CLAMP_V(poly2) ) {
   135 	    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
   136 	} else {
   137 	    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
   138 	}
   139     } else {
   140 	glDisable( GL_TEXTURE_2D );
   141     }
   143     glShadeModel( POLY1_SHADE_MODEL(poly1) );
   145     int srcblend = POLY2_SRC_BLEND(poly2);
   146     int destblend = POLY2_DEST_BLEND(poly2);
   147     glBlendFunc( srcblend, destblend );
   148 }
   150 void render_vertexes( uint32_t poly1, uint32_t *vertexes, int num_vertexes, int vertex_size,
   151 		      int render_mode ) 
   152 {
   153     int i, m=0;
   155     if( render_mode == RENDER_FULLMOD ) {
   156 	m = (vertex_size - 3)/2;
   157     }
   159     glBegin( GL_TRIANGLE_STRIP );
   161     for( i=0; i<num_vertexes; i++ ) {
   162 	float *vertexf = (float *)vertexes;
   163 	uint32_t argb;
   164 	if( POLY1_TEXTURED(poly1) ) {
   165 	    if( POLY1_UV16(poly1) ) {
   166 		glTexCoord2f( halftofloat(vertexes[m+3]>>16),
   167 			      halftofloat(vertexes[m+3]) );
   168 		argb = vertexes[m+4];
   169 	    } else {
   170 		glTexCoord2f( vertexf[m+3], vertexf[m+4] );
   171 		argb = vertexes[m+5];
   172 	    }
   173 	} else {
   174 	    argb = vertexes[m+3];
   175 	}
   177 	glColor4ub( (GLubyte)(argb >> 16), (GLubyte)(argb >> 8), 
   178 		    (GLubyte)argb, (GLubyte)(argb >> 24) );
   179 	glVertex3f( vertexf[0], vertexf[1], vertexf[2] );
   180 	vertexes += vertex_size;
   181     }
   183     glEnd();
   184 }
   186 /**
   187  * Render a simple (not auto-sorted) tile
   188  */
   189 void render_tile( pvraddr_t tile_entry, int render_mode, gboolean cheap_modifier_mode ) {
   190     uint32_t poly_bank = MMIO_READ(PVR2,RENDER_POLYBASE);
   191     uint32_t *tile_list = (uint32_t *)(video_base+tile_entry);
   192     do {
   193 	uint32_t entry = *tile_list++;
   194 	if( entry >> 28 == 0x0F ) {
   195 	    break;
   196 	} else if( entry >> 28 == 0x0E ) {
   197 	    tile_list = (uint32_t *)(video_base + (entry&0x007FFFFF));
   198 	} else {
   199 	    uint32_t *polygon = (uint32_t *)(video_base + poly_bank + ((entry & 0x000FFFFF) << 2));
   200 	    int is_modified = entry & 0x01000000;
   201 	    int vertex_length = (entry >> 21) & 0x07;
   202 	    int context_length = 3;
   203 	    if( is_modified && !cheap_modifier_mode ) {
   204 		context_length = 5;
   205 		vertex_length *= 2 ;
   206 	    }
   207 	    vertex_length += 3;
   209 	    if( (entry & 0xE0000000) == 0x80000000 ) {
   210 		/* Triangle(s) */
   211 		int strip_count = ((entry >> 25) & 0x0F)+1;
   212 		int polygon_length = 3 * vertex_length + context_length;
   213 		int i;
   214 		for( i=0; i<strip_count; i++ ) {
   215 		    render_set_context( polygon, render_mode );
   216 		    render_vertexes( *polygon, polygon+context_length, 3, vertex_length,
   217 				     render_mode );
   218 		    polygon += polygon_length;
   219 		}
   220 	    } else if( (entry & 0xE0000000) == 0xA0000000 ) {
   221 		/* Sprite(s) */
   222 		int strip_count = (entry >> 25) & 0x0F;
   223 		int polygon_length = 4 * vertex_length + context_length;
   224 		int i;
   225 		for( i=0; i<strip_count; i++ ) {
   226 		    render_set_context( polygon, render_mode );
   227 		    render_vertexes( *polygon, polygon+context_length, 4, vertex_length,
   228 				     render_mode );
   229 		    polygon += polygon_length;
   230 		}
   231 	    } else {
   232 		/* Polygon */
   233 		int i, first=-1, last = -1;
   234 		for( i=0; i<6; i++ ) {
   235 		    if( entry & (0x40000000>>i) ) {
   236 			if( first == -1 ) first = i;
   237 			last = i;
   238 		    }
   239 		}
   240 		if( first != -1 ) {
   241 		    first = 0;
   242 		    render_set_context(polygon, render_mode);
   243 		    render_vertexes( *polygon, polygon+context_length + (first*vertex_length),
   244 				     (last-first+3), vertex_length, render_mode );
   245 		}
   246 	    }
   247 	}
   248     } while( 1 );
   249 }
   251 void pvr2_render_tilebuffer( int width, int height, int clipx1, int clipy1, 
   252 			int clipx2, int clipy2 ) {
   254     pvraddr_t segmentbase = MMIO_READ( PVR2, RENDER_TILEBASE );
   255     int tile_sort;
   256     gboolean cheap_shadow;
   258     int obj_config = MMIO_READ( PVR2, RENDER_OBJCFG );
   259     int isp_config = MMIO_READ( PVR2, RENDER_ISPCFG );
   260     int shadow_cfg = MMIO_READ( PVR2, RENDER_SHADOW );
   262     if( (obj_config & 0x00200000) == 0 ) {
   263 	if( isp_config & 1 ) {
   264 	    tile_sort = 0;
   265 	} else {
   266 	    tile_sort = 2;
   267 	}
   268     } else {
   269 	tile_sort = 1;
   270     }
   272     cheap_shadow = shadow_cfg & 0x100 ? TRUE : FALSE;
   274     struct tile_segment *segment = (struct tile_segment *)(video_base + segmentbase);
   276     struct timeval tv_start, tv_end;
   277     gettimeofday(&tv_start, NULL);
   278     glEnable( GL_SCISSOR_TEST );
   279     do {
   280 	// fwrite_dump32v( (uint32_t *)segment, sizeof(struct tile_segment), 6, stderr );
   281 	int tilex = SEGMENT_X(segment->control);
   282 	int tiley = SEGMENT_Y(segment->control);
   284 	int x1 = tilex << 5;
   285 	int y1 = tiley << 5;
   286 	if( x1 + 32 <= clipx1 ||
   287 	    y1 + 32 <= clipy1 ||
   288 	    x1 >= clipx2 ||
   289 	    y1 >= clipy2 ) {
   290 	    /* Tile completely clipped, skip */
   291 	    continue;
   292 	}
   294 	/* Set a scissor on the visible part of the tile */
   295 	int w = MIN(x1+32, clipx2) - x1;
   296 	int h = MIN(y1+32, clipy2) - y1;
   297 	x1 = MAX(x1,clipx1);
   298 	y1 = MAX(y1,clipy1);
   299 	glScissor( x1, height-y1-h, w, h );
   301 	if( (segment->opaque_ptr & NO_POINTER) == 0 ) {
   302 	    if( (segment->opaquemod_ptr & NO_POINTER) == 0 ) {
   303 		/* TODO */
   304 	    }
   305 	    render_tile( segment->opaque_ptr, RENDER_NORMAL, cheap_shadow );
   306 	}
   308 	if( (segment->trans_ptr & NO_POINTER) == 0 ) {
   309 	    if( (segment->transmod_ptr & NO_POINTER) == 0 ) {
   310 		/* TODO */
   311 	    } 
   312 	    if( tile_sort == 2 || 
   313 		(tile_sort == 1 && ((segment->control & SEGMENT_SORT_TRANS)==0)) ) {
   314 		render_autosort_tile( segment->trans_ptr, RENDER_NORMAL, cheap_shadow );
   315 	    } else {
   316 		render_tile( segment->trans_ptr, RENDER_NORMAL, cheap_shadow );
   317 	    }
   318 	}
   320 	if( (segment->punchout_ptr & NO_POINTER) == 0 ) {
   321 	    render_tile( segment->punchout_ptr, RENDER_NORMAL, cheap_shadow );
   322 	}
   323     } while( ((segment++)->control & SEGMENT_END) == 0 );
   324     glDisable( GL_SCISSOR_TEST );
   326     gettimeofday(&tv_end, NULL);
   327     timersub(&tv_end,&tv_start, &tv_start);
   328 }
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