// license:BSD-3-Clause // copyright-holders:Ville Linde, Aaron Giles /*************************************************************************** polylgcy.h Legacy polygon helper routines. **************************************************************************** Pixel model: (0.0,0.0) (1.0,0.0) (2.0,0.0) (3.0,0.0) +---------------+---------------+---------------+ | | | | | | | | | (0.5,0.5) | (1.5,0.5) | (2.5,0.5) | | * | * | * | | | | | | | | | (0.0,1.0) (1.0,1.0) (2.0,1.0) (3.0,1.0) +---------------+---------------+---------------+ | | | | | | | | | (0.5,1.5) | (1.5,1.5) | (2.5,1.5) | | * | * | * | | | | | | | | | | | | | +---------------+---------------+---------------+ (0.0,2.0) (1.0,2.0) (2.0,2.0) (3.0,2.0) ***************************************************************************/ #ifndef MAME_VIDEO_POLYLGCY_H #define MAME_VIDEO_POLYLGCY_H #pragma once /*************************************************************************** CONSTANTS ***************************************************************************/ static constexpr unsigned POLYLGCY_MAX_VERTEX_PARAMS = 6; static constexpr unsigned POLYLGCY_MAX_POLYGON_VERTS = 32; static constexpr uint8_t POLYLGCY_FLAG_INCLUDE_BOTTOM_EDGE = 0x01; static constexpr uint8_t POLYLGCY_FLAG_INCLUDE_RIGHT_EDGE = 0x02; static constexpr uint8_t POLYLGCY_FLAG_NO_WORK_QUEUE = 0x04; static constexpr uint8_t POLYLGCY_FLAG_ALLOW_QUADS = 0x08; /*************************************************************************** TYPE DEFINITIONS ***************************************************************************/ /* opaque reference to the poly manager */ struct legacy_poly_manager; /* input vertex data */ struct poly_vertex { float x; /* X coordinate */ float y; /* Y coordinate */ float p[POLYLGCY_MAX_VERTEX_PARAMS]; /* interpolated parameter values */ }; /* poly_param_extent describes information for a single parameter in an extent */ struct poly_param_extent { float start; /* parameter value at starting X,Y */ float dpdx; /* dp/dx relative to starting X */ }; /* poly_extent describes start/end points for a scanline, along with per-scanline parameters */ struct poly_extent { int16_t startx; /* starting X coordinate (inclusive) */ int16_t stopx; /* ending X coordinate (exclusive) */ poly_param_extent param[POLYLGCY_MAX_VERTEX_PARAMS]; /* starting and dx values for each parameter */ }; /* callback routine to process a batch of scanlines in a triangle */ typedef void (*poly_draw_scanline_func)(void *dest, int32_t scanline, const poly_extent *extent, const void *extradata, int threadid); /*************************************************************************** TYPE DEFINITIONS ***************************************************************************/ /* ----- initialization/teardown ----- */ /* allocate a new poly manager that can render triangles */ legacy_poly_manager *poly_alloc(running_machine &machine, int max_polys, size_t extra_data_size, uint8_t flags); /* free a poly manager */ void poly_free(legacy_poly_manager *poly); /* ----- common functions ----- */ /* wait until all polygons in the queue have been rendered */ void poly_wait(legacy_poly_manager *poly, const char *debug_reason); /* get a pointer to the extra data for the next polygon */ void *poly_get_extra_data(legacy_poly_manager *poly); /* ----- core triangle rendering ----- */ /* render a single triangle given 3 vertexes */ uint32_t poly_render_triangle(legacy_poly_manager *poly, void *dest, const rectangle &cliprect, poly_draw_scanline_func callback, int paramcount, const poly_vertex *v1, const poly_vertex *v2, const poly_vertex *v3); /* render a set of triangles in a fan */ uint32_t poly_render_triangle_fan(legacy_poly_manager *poly, void *dest, const rectangle &cliprect, poly_draw_scanline_func callback, int paramcount, int numverts, const poly_vertex *v); /* perform a custom render of an object, given specific extents */ uint32_t poly_render_triangle_custom(legacy_poly_manager *poly, void *dest, const rectangle &cliprect, poly_draw_scanline_func callback, int startscanline, int numscanlines, const poly_extent *extents); /* ----- core quad rendering ----- */ /* render a single quad given 4 vertexes */ uint32_t poly_render_quad(legacy_poly_manager *poly, void *dest, const rectangle &cliprect, poly_draw_scanline_func callback, int paramcount, const poly_vertex *v1, const poly_vertex *v2, const poly_vertex *v3, const poly_vertex *v4); /* render a set of quads in a fan */ uint32_t poly_render_quad_fan(legacy_poly_manager *poly, void *dest, const rectangle &cliprect, poly_draw_scanline_func callback, int paramcount, int numverts, const poly_vertex *v); /* ----- core polygon rendering ----- */ /* render a single polygon up to 32 vertices */ uint32_t poly_render_polygon(legacy_poly_manager *poly, void *dest, const rectangle &cliprect, poly_draw_scanline_func callback, int paramcount, int numverts, const poly_vertex *v); /* ----- clipping ----- */ /* zclip (assumes p[0] == z) a polygon */ int poly_zclip_if_less(int numverts, const poly_vertex *v, poly_vertex *outv, int paramcount, float clipval); #endif // MAME_VIDEO_POLYLGCY_H