- v2f cursor;
- v2f invUv;
- v2_copy( origin, cursor );
-
- float invScale = (size / (float)font->size);
- invUv[0] = 1.0f / (float)font->width;
- invUv[1] = 1.0f / (float)font->height;
-
- u16 base_idx = start * 4;
-
- const char *_c = str;
- char c;
- while( (c = *(_c ++)) )
- {
- if( c == '\n' )
- {
- cursor[1] -= size * 1.25f;
- cursor[0] = origin[0];
- }
- else if( c >= 32 && c <= 126 )
- {
- struct sdf_char *pch = &font->characters[ c - ' ' ];
- struct vector_glyph_vert *vt = &text_buffers.buffer[ count * 4 ];
- u16 *ind = &text_buffers.indices[ count * 6 ];
-
- // Emit quad
- v2f p0; v2f uv0;
- v2f p1; v2f uv1;
-
- v2_muladds( cursor, (v2f){ pch->originX, -pch->originY }, -invScale, p0 );
- v2_muladds( p0, (v2f){ pch->w, -pch->h }, invScale, p1 );
-
- v2_mul( (v2f){ pch->uvx, pch->uvy }, invUv, uv0 );
- v2_muladd( uv0, (v2f){ pch->w, pch->h }, invUv, uv1 );
-
- v2_copy( p0, vt[0].co );
- v2_copy( uv0, vt[0].uv );
- vt[0].colour = 0xffffffff;
-
- v2_copy( (v2f){ p0[0], p1[1] }, vt[1].co );
- v2_copy( (v2f){ uv0[0], uv1[1] }, vt[1].uv );
- vt[1].colour = 0xffffffff;
-
- v2_copy( p1, vt[2].co );
- v2_copy( uv1, vt[2].uv );
- vt[2].colour = 0xffffffff;
-
- v2_copy( (v2f){ p1[0], p0[1] }, vt[3].co );
- v2_copy( (v2f){ uv1[0], uv0[1] }, vt[3].uv );
- vt[3].colour = 0xffffffff;
-
- // Emit indices
- ind[0] = base_idx+count*4;
- ind[1] = base_idx+count*4+1;
- ind[2] = base_idx+count*4+2;
- ind[3] = base_idx+count*4;
- ind[4] = base_idx+count*4+2;
- ind[5] = base_idx+count*4+3;
-
- cursor[0] += (float)pch->advance * invScale;
- count ++;
- }
- }
-
- glBindVertexArray( text_buffers.vao );
-
- glBindBuffer( GL_ARRAY_BUFFER, text_buffers.vbo );
- glBufferSubData( GL_ARRAY_BUFFER,
- start*4*sizeof( struct vector_glyph_vert ),
- count*4*sizeof( struct vector_glyph_vert ),
- text_buffers.buffer
- );
-
- glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, text_buffers.ebo );
- glBufferSubData( GL_ELEMENT_ARRAY_BUFFER, start*6*sizeof(u16), count*6*sizeof(u16), text_buffers.indices );
-
- return count;
-}