X-Git-Url: https://harrygodden.com/git/?p=csRadar.git;a=blobdiff_plain;f=csrDraw.h;h=a3f601e722575d887b965ccd1865f4f64f86ac8d;hp=e0d125e7482b0334a156b6c0f33516a99f98f892;hb=HEAD;hpb=0399aad1d7374badf037a2696d9e276d71b7a297

diff --git a/csrDraw.h b/csrDraw.h
index e0d125e..a3f601e 100644
--- a/csrDraw.h
+++ b/csrDraw.h
@@ -1,27 +1,239 @@
-typedef struct csr_frag csr_frag;
+// Copyright (C) 2021 Harry Godden (hgn)
 
-struct csr_frag
+// Extremely simple software renderer. Only supports orthographic
+//=======================================================================================================================
+
+typedef struct csr_target csr_target;
+typedef struct csr_filter csr_filter;
+typedef struct csr_shader csr_shader;
+typedef enum EMSAA EMSAA;
+
+typedef void (* csr_frag_program)( void *, vmf_vert[3], float, float, float );
+typedef void (* csr_frag_clear)( void * );
+
+// API
+//=======================================================================================================================
+
+// Create a render target. Resolution, msaa, and shader must be known at this point!
+void csr_create_target( csr_target *rt, u32 x, u32 y, EMSAA aa, csr_shader *shader );
+void csr_rt_clear( csr_target *rt );
+void csr_rt_free( csr_target *rt );
+
+// Refit bounds so that it is square, and crops to center with padding
+void csr_auto_fit( csr_target *rt, float padding );
+
+// Run this after bounds have been adjusted on the RT to update the size of the msaa
+// Auto fit will call this.
+void csr_update_subsamples( csr_target *rt );
+
+// Write CS:GO radar txt
+void csr_write_txt( char const *path, const char *name, csr_target *rt  );
+
+// Render calls
+// ------------
+
+// Render a finalzied triangle into target. Coordinates are world space
+void simple_raster( csr_target *rt, vmf_vert tri[3] );
+
+// Draw a batch of triangles with an affine world transformation
+void csr_draw( csr_target *rt, vmf_vert *triangles, u32 triangle_count, m4x3f transform );
+
+// Draw VMF with filtering options. Will automatically branch into instances
+// You should call this with the last two recursive arguments (prev,inst), set to NULL
+//
+// Filter is optional, it can be st to NULL to just render everything.
+void csr_vmf_render( csr_target *rt, vmf_map *map, vdf_node *root, csr_filter *filter, m4x3f prev, m4x3f inst );
+
+void csr_rt_save_tga( csr_target *rt, const char *path, u32 offset, u32 nc );
+void csr_rt_save_c32f( csr_target *rt, const char *path, u32 offset );
+
+
+// Implementation
+//=======================================================================================================================
+
+struct csr_shader
+{
+	u32 stride;
+	csr_frag_program frag;
+	csr_frag_clear clear;
+};
+
+struct csr_target
+{
+	void  *colour;
+	float *depth;
+	
+	u32 x, y; 
+	boxf bounds;
+	float scale;
+	
+	v2f subsamples[ 8 ];
+	int num_samples;
+	v2f *sample_src;
+	
+	csr_shader *shader;
+};
+
+struct csr_filter
 {
-	u32 id;	// Triangle index
-	float qa, qb;	// Quantities
+	const char *visgroup;		// Limit to this visgroup only
+	const char *classname;		// Limit to this exact classname. will not draw world
 	
-	float depth;	// 'depth testing'
+	int compute_bounds_only;
+};
+
+enum EMSAA
+{
+	k_EMSAA_none,
+	k_EMSAA_2x2,
+	k_EMSAA_RGSS,
+	k_EMSAA_8R
+};
+
+#ifdef CSR_EXECUTABLE
+
+// MSAA patterns
+v2f csr_msaa_1[] =
+{
+	{0.f, 0.f}
+};
+
+// XX
+// XX
+v2f csr_msaa_2x2[] =
+{
+	{  0x0.4p0f,  0x0.4p0f },
+	{  0x0.4p0f, -0x0.4p0f },
+	{ -0x0.4p0f, -0x0.4p0f },
+	{ -0x0.4p0f,  0x0.4p0f }
 };
 
-void clear_depth( csr_frag fragments[], u32 x, u32 y )
+//   X 
+// X   
+//    X
+// X   
+v2f csr_msaa_2x2rgss[] =
 {
-	for( u32 i = 0; i < x*y; i ++ )
+	{  0x0.2p0f,  0x0.6p0f },
+	{ -0x0.6p0f,  0x0.2p0f },
+	{ -0x0.2p0f, -0x0.6p0f },
+	{  0x0.6p0f, -0x0.2p0f }
+};
+
+//     X   
+//   X     
+// X       
+//       X 
+//  X      
+//        X
+//      X  
+//    X    
+v2f csr_msaa_8rook[] = 
+{
+	{  0x0.1p0f,  0x0.7p0f },
+	{  0x0.5p0f,  0x0.1p0f },
+	{  0x0.7p0f, -0x0.3p0f },
+	{  0x0.3p0f, -0x0.5p0f },
+	{ -0x0.1p0f, -0x0.7p0f },
+	{ -0x0.5p0f, -0x0.1p0f },
+	{ -0x0.7p0f,  0x0.3p0f },
+	{ -0x0.3p0f,  0x0.5p0f }
+};
+
+
+void csr_create_target( csr_target *rt, u32 x, u32 y, EMSAA aa, csr_shader *shader )
+{
+	rt->x = x;
+	rt->y = y;
+	
+	switch( aa )
 	{
-		fragments[ i ].depth = INFINITY;
+		default:
+		case k_EMSAA_none:
+			rt->num_samples = 1;
+			rt->sample_src = csr_msaa_1;
+			break;
+			
+		case k_EMSAA_2x2:
+			rt->num_samples = 4;
+			rt->sample_src = csr_msaa_2x2;
+			break;
+			
+		case k_EMSAA_RGSS:
+			rt->num_samples = 4;
+			rt->sample_src = csr_msaa_2x2rgss;
+			break;
+			
+		case k_EMSAA_8R:
+			rt->num_samples = 8;
+			rt->sample_src = csr_msaa_8rook;
+			break;
 	}
+	
+	rt->shader = shader;
+	rt->depth = (float *)csr_malloc( x*y*rt->num_samples * sizeof(float) );
+	rt->colour = csr_malloc( x * y * rt->shader->stride * rt->num_samples );
+	
+	v3_fill( rt->bounds[0], INFINITY );
+	v3_fill( rt->bounds[1], -INFINITY );
+}
+
+void csr_update_subsamples( csr_target *rt )
+{
+	float range_x = (rt->bounds[1][0]-rt->bounds[0][0]);
+	float range_y = (rt->bounds[1][1]-rt->bounds[0][1]);
+
+	v2f pixel_size = { range_x/(float)rt->x, range_y/(float)rt->y };
+
+	for( int i = 0; i < rt->num_samples; i ++ )
+	{
+		v2_mul( rt->sample_src[i], pixel_size, rt->subsamples[i] );
+	}
+}
+
+void csr_rt_free( csr_target *rt )
+{
+	free( rt->depth );
+	free( rt->colour );
 }
 
-void simple_raster( csr_frag fragments[], u32 x, u32 y, v4f cam_bounds, vmf_vert tri[3], int id )
+void csr_rt_clear( csr_target *rt )
 {
-	// Very simplified tracing algorithm
+	for( u32 i = 0; i < rt->x*rt->y*rt->num_samples; i ++ )
+	{
+		rt->shader->clear( rt->colour + i * rt->shader->stride );	
+		rt->depth[i] = 0.f;
+	}
+}
+
+void csr_auto_fit( csr_target *rt, float padding )
+{
+	// Correct aspect ratio to be square
+	float dx, dy, l, cx, cy;
+
+	dx = rt->bounds[1][0] - rt->bounds[0][0];
+	dy = rt->bounds[1][1] - rt->bounds[0][1];
+	
+	l = fmaxf( dx, dy ) * .5f;
+		
+	cx = (rt->bounds[1][0] + rt->bounds[0][0]) * .5f;
+	cy = (rt->bounds[1][1] + rt->bounds[0][1]) * .5f;
+
+	rt->bounds[0][0] = cx - l - padding;
+	rt->bounds[1][0] = cx + l + padding;
+	rt->bounds[0][1] = cy - l - padding;
+	rt->bounds[1][1] = cy + l + padding;
+	
+	rt->scale = l + padding;
+	
+	csr_update_subsamples( rt );
+}
 
+void simple_raster( csr_target *rt, vmf_vert tri[3] )
+{
+	// Very very simplified rasterizing algorithm
 	v2f bmin = { 0.f, 0.f };
-	v2f bmax = { x, y };
+	v2f bmax = { rt->x, rt->y };
 	
 	v2_minv( tri[0].co, tri[1].co, bmin );
 	v2_minv( tri[2].co, bmin, bmin );
@@ -29,47 +241,331 @@ void simple_raster( csr_frag fragments[], u32 x, u32 y, v4f cam_bounds, vmf_vert
 	v2_maxv( tri[0].co, tri[1].co, bmax );
 	v2_maxv( tri[2].co, bmax, bmax );
 
-	float range_x = (cam_bounds[2]-cam_bounds[0])/(float)x;
-	float range_y = (cam_bounds[3]-cam_bounds[1])/(float)y;
-
-	int start_x = csr_max( 0, floorf( (bmin[0]-cam_bounds[0])/range_x));
-	int end_x =   csr_min( x, floorf( (bmax[0]-cam_bounds[0])/range_x ));
-	int start_y = csr_max( 0, ceilf( (bmin[1]-cam_bounds[1])/range_y ));
-	int end_y =   csr_min( y, ceilf( (bmax[1]-cam_bounds[1])/range_y ));
+	float range_x = (rt->bounds[1][0]-rt->bounds[0][0])/(float)rt->x;
+	float range_y = (rt->bounds[1][1]-rt->bounds[0][1])/(float)rt->y;
+	
+	int start_x = csr_min( rt->x-1, csr_max( 0,       floorf( (bmin[0]-rt->bounds[0][0])/range_x)));
+	int end_x =   csr_max( 0,       csr_min( rt->x-1,  ceilf( (bmax[0]-rt->bounds[0][0])/range_x)));
+	int start_y = csr_min( rt->y-1, csr_max( 0,       floorf( (bmin[1]-rt->bounds[0][1])/range_y)));
+	int end_y =   csr_max( 0,       csr_min( rt->y-1,  ceilf( (bmax[1]-rt->bounds[0][1])/range_y)));
 	
-	v3f trace_dir = { 0.f, 0.f, -1.f };
-	v3f trace_origin = { 0.f, 0.f, 16385.f };
+	v2f v0, v1, v2, vp;
+	float d, bca = 0.f, bcb = 0.f, bcc = 0.f;
+	
+	v2_sub( tri[1].co, tri[0].co, v0 );
+	v2_sub( tri[2].co, tri[0].co, v1 );
+	v2_sub( tri[1].co, tri[2].co, v2 );
+	d = 1.f / (v0[0]*v1[1] - v1[0]*v0[1]);
+
+	// Backface culling
+	if( v2_cross( v0, v1 ) > 0.f )
+		return;
+
+	v2f trace_origin;
 
-	for( u32 py = start_y; py < end_y; py ++ )
+	for( u32 py = start_y; py <= end_y; py ++ )
 	{
-		trace_origin[1] = csr_lerpf( cam_bounds[1], cam_bounds[3], (float)py/(float)y );
+		trace_origin[1] = csr_lerpf( rt->bounds[0][1], rt->bounds[1][1], (float)py/(float)rt->y );
 		
-		for( u32 px = start_x; px < end_x; px ++ )
+		for( u32 px = start_x; px <= end_x; px ++ )
 		{
-			trace_origin[0] = csr_lerpf( cam_bounds[0], cam_bounds[2], (float)px/(float)x );
-			
-			csr_frag *frag = &fragments[ py*y + px ];
+			u32 sample_index = ((rt->y-py-1)*rt->x+px) * rt->num_samples;
+		
+			void *frag = rt->colour + sample_index*rt->shader->stride;
+			float *depth = &rt->depth[ sample_index ];
 
-			float tqa = 0.f, tqb = 0.f;
-			float tdepth = csr_ray_tri( trace_origin, trace_dir, tri[0].co, tri[1].co, tri[2].co, &tqa, &tqb );
+			trace_origin[0] = csr_lerpf( rt->bounds[0][0], rt->bounds[1][0], (float)px/(float)rt->x );
 			
-			if( tdepth < frag->depth )
+			// Determine coverage
+			for( int i = 0; i < rt->num_samples; i ++ )
 			{
-				frag->depth = tdepth;
-				frag->id = id;
-				frag->qa = tqa;
-				frag->qb = tqb;
+				v3f sample_origin;
+				
+				v2_add( rt->subsamples[ i ], trace_origin, sample_origin );
+				v2_sub( sample_origin, tri[0].co, vp );
+				
+				if( v2_cross( v0, vp ) > 0.f )
+					continue;
+				if( v2_cross( vp, v1 ) > 0.f )
+					continue;
+				
+				v2f vp2;
+				v2_sub( sample_origin, tri[2].co, vp2 );
+				
+				if( v2_cross( vp2, v2 ) > 0.f )
+					continue;
+
+				bcb = (vp[0]*v1[1] - v1[0]*vp[1]) * d;
+				bcc = (v0[0]*vp[1] - vp[0]*v0[1]) * d;
+				bca = 1.f - bcb - bcc;
+				
+				float hit = tri[0].co[2] * bca + tri[1].co[2] * bcb + tri[2].co[2] * bcc;
+				float hit_depth = hit + 16385.f;
+				
+				if( hit_depth > depth[i] && hit >= rt->bounds[0][2] && hit <= rt->bounds[1][2] )
+				{
+					depth[i] = hit_depth;
+					rt->shader->frag( frag+i*rt->shader->stride, tri, bca, bcb, bcc );
+				}
 			}
 		}
 	}
 }
 
-// First pass 'fragmentize'
-void draw_buffers( csr_frag fragments[], u32 x, u32 y, v4f cam_bounds, vmf_vert *triangles, u32 triangle_count )
+void csr_draw( csr_target *rt, vmf_vert *triangles, u32 triangle_count, m4x3f transform )
 {
+	m3x3f normal;
+	vmf_vert new_tri[3];
+
+	// Derive normal matrix
+	m4x3_to_3x3( transform, normal );
+	m3x3_inv_transpose( normal, normal );
+
 	for( u32 i = 0; i < triangle_count; i ++ )
 	{
 		vmf_vert *triangle = triangles + i*3;
-		simple_raster( fragments, x, y, cam_bounds, triangle, i );
+		
+		m4x3_mulv( transform, triangle[0].co, new_tri[0].co );
+		m4x3_mulv( transform, triangle[1].co, new_tri[1].co );
+		m4x3_mulv( transform, triangle[2].co, new_tri[2].co );
+
+		m3x3_mulv( normal, triangle[0].nrm, new_tri[0].nrm );
+		m3x3_mulv( normal, triangle[1].nrm, new_tri[1].nrm );
+		m3x3_mulv( normal, triangle[2].nrm, new_tri[2].nrm );
+		
+		v3_normalize( new_tri[0].nrm );
+		v3_normalize( new_tri[1].nrm );
+		v3_normalize( new_tri[2].nrm );
+		
+		m4x3_mulv( transform, triangles[0].origin, new_tri[0].origin );
+		
+		simple_raster( rt, new_tri );
+	}
+}
+
+void csr_vmf_render( csr_target *rt, vmf_map *map, vdf_node *root, csr_filter *filter, m4x3f prev, m4x3f inst )
+{
+	m4x3f transform = M4X3_IDENTITY;
+	vmf_solid solid;
+	vmf_vert tri[3];
+	boxf trf_bounds;
+
+	u32 group_id = 0;
+	int filter_visgroups = 0, filter_classname = 0, compute_bounds_only = 0;
+	
+	if( filter )
+	{
+		if( filter->visgroup )
+		{
+			filter_visgroups = 1;
+			group_id = vmf_visgroup_id( root, filter->visgroup );
+		}
+		
+		if( filter->classname )
+		{
+			filter_classname = 1;
+		}
+		
+		compute_bounds_only = filter->compute_bounds_only;
+	}
+	
+	// Multiply previous transform with instance transform to create basis
+	if( prev )
+	{
+		m4x3_mul( prev, inst, transform );
+	}
+
+	// Gather world brushes
+	solidgen_ctx_init( &solid );
+	
+	if( !filter_classname )
+	{
+		vdf_node *world = vdf_next( root, "world", NULL );
+		
+		vdf_foreach( world, "solid", brush )
+		{
+			if( filter_visgroups && !vmf_visgroup_match( brush, group_id ) )
+				continue;
+			
+			// TODO: heap-use-after-free
+			solidgen_push( &solid, brush );
+		}
+	}
+		
+	// Actual entity loop
+	m4x3f model;
+	
+	vdf_foreach( root, "entity", ent )
+	{
+		if( filter_visgroups && !vmf_visgroup_match( ent, group_id ) )
+			continue;
+	
+		if( filter_classname )
+			if( strcmp( kv_get( ent, "classname", "" ), filter->classname ) )
+				continue;
+	
+		if( ent->user & VMF_FLAG_IS_PROP )
+		{
+			// Create model transform
+			m4x3_identity( model );
+			
+			vmf_entity_transform( ent, model );
+			m4x3_mul( transform, model, model );
+			
+			// Draw model
+			mdl_mesh_t *mdl = &map->models[ ent->user1 ].mdl;
+			
+			if( compute_bounds_only )
+			{
+				map->models[ ent->user1 ].need_load = 1;
+				m4x3_expand_aabb_point( model, rt->bounds, (v3f){0.f,0.f,0.f} );
+			}
+			else
+			{
+				for( int i = 0; i < mdl->num_indices/3; i ++ )
+				{
+					for( int j = 0; j < 3; j ++ )
+					{
+						v3_copy( &mdl->vertices[ mdl->indices[ i*3+j ] *8 ],   tri[j].co );
+						v3_copy( &mdl->vertices[ mdl->indices[ i*3+j ] *8+3 ], tri[j].nrm );
+						v3_zero( tri[j].origin );
+					}
+					
+					csr_draw( rt, tri, 1, model );
+				}
+			}
+		} 
+		else if( ent->user & VMF_FLAG_IS_INSTANCE )
+		{
+			m4x3_identity( model );
+			vmf_entity_transform( ent, model );
+			
+			csr_vmf_render( rt, map, map->cache[ ent->user1 ].root, filter, transform, model );
+		}
+		else
+		{
+			// Brush entity
+			vdf_foreach( ent, "solid", ent_solid )
+			{
+				solidgen_push( &solid, ent_solid );
+			}
+		}
 	}
+	
+	if( compute_bounds_only )
+	{
+		solidgen_bounds( &solid, trf_bounds );
+		m4x3_transform_aabb( transform, trf_bounds );
+		box_concat( rt->bounds, trf_bounds );
+	}
+	else
+	{
+		// Draw brushes
+		for( int i = 0; i < csr_sb_count( solid.indices )/3; i ++ )
+		{
+			u32 * base = solid.indices + i*3;
+			
+			tri[0] = solid.verts[ base[0] ];
+			tri[1] = solid.verts[ base[1] ];
+			tri[2] = solid.verts[ base[2] ];
+			
+			csr_draw( rt, tri, 1, transform );
+		}	
+	}
+	
+	solidgen_ctx_reset( &solid );
+	solidgen_ctx_free( &solid );
+}
+
+void csr_write_filerr( const char *path )
+{
+	log_error( "File write error (No such file or directory): '%s'\n", path );
 }
+
+void csr_write_txt( char const *path, const char *name, csr_target *rt  )
+{
+	FILE *write_ptr;
+	
+	write_ptr = fopen( path, "w" );
+	
+	if( write_ptr )
+	{
+		fprintf( write_ptr, "\"%s\"\n\{\n", name );
+		fprintf( write_ptr, "\t\"material\" \"overviews/%s\"\n", name );
+		fprintf( write_ptr, "\t\"pos_x\" \"%.8f\"\n", rt->bounds[0][0] );
+		fprintf( write_ptr, "\t\"pos_y\" \"%.8f\"\n", rt->bounds[0][1] );
+		fprintf( write_ptr, "\t\"scale\" \"%.8f\"\n", rt->scale / (float)rt->x );
+		fprintf( write_ptr, "}\n" );
+		
+		fclose( write_ptr );
+	}
+	else
+	{
+		csr_write_filerr( path );
+	}
+}
+
+// ALWAYS RGB32
+void csr_rt_save_c32f( csr_target *rt, const char *path, u32 offset )
+{
+	float *image = (float *)csr_malloc( rt->x*rt->y*3*sizeof(float) );
+	
+	float contrib = 1.f/(float)rt->num_samples;
+	
+	for( int i = 0; i < rt->x*rt->y; i ++ )
+	{
+		void *src = rt->colour + offset + i * rt->num_samples * rt->shader->stride;
+		float *dst = image + i*3;
+		
+		v3_zero( dst );
+		for( int k = 0; k < rt->num_samples; k ++ )
+		{
+			v3_muladds( dst, (float *)(src + k*rt->shader->stride), contrib, dst );
+		}
+	}
+	
+	if( !csr_32f_write( path, rt->x, rt->y, image ) )
+		csr_write_filerr( path );
+		
+	free( image );
+}
+
+// Save floating point buffer to tga. Must be in range (0-1)
+// Offset and stride are in bytes
+void csr_rt_save_tga( csr_target *rt, const char *path, u32 offset, u32 nc )
+{
+	u8 *image = (u8 *)csr_malloc( rt->x*rt->y * 4 );
+	
+	float contrib = 255.f/(float)rt->num_samples;
+	
+	for( int i = 0; i < rt->x*rt->y; i ++ )
+	{
+		void *src = rt->colour + offset + i * rt->num_samples * rt->shader->stride;
+		u8 *dst = image + i*4;
+		
+		v4f accum = { 0.f, 0.f, 0.f, 0.f };
+		
+		for( int k = 0; k < rt->num_samples; k ++ )
+		{
+			float *src_sample = (float *)(src + k*rt->shader->stride);
+		
+			for( int j = 0; j < nc; j ++ )
+			{
+				accum[ j ] += src_sample[ j ] * contrib;
+			}
+		}
+		
+		// TODO: Clamp this value
+		dst[0] = accum[0];
+		dst[1] = accum[1];
+		dst[2] = accum[2];
+		dst[3] = accum[3];
+	}
+	
+	if( !csr_tga_write( path, rt->x, rt->y, nc, image ) )
+		csr_write_filerr( path );
+		
+	free( image );
+}
+
+#endif