2 * Mesa 3-D graphics library
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28 * \file swrast/swrast.h
29 * \brief Public interface to the software rasterization functions.
30 * \author Keith Whitwell <keith@tungstengraphics.com>
36 #include "main/mtypes.h"
37 #include "swrast/s_chan.h"
41 * If non-zero use GLdouble for walking triangle edges, for better accuracy.
43 #define TRIANGLE_WALK_DOUBLE 0
47 * Bits per depth buffer value (max is 32).
49 #ifndef DEFAULT_SOFTWARE_DEPTH_BITS
50 #define DEFAULT_SOFTWARE_DEPTH_BITS 16
52 /** Depth buffer data type */
53 #if DEFAULT_SOFTWARE_DEPTH_BITS <= 16
54 #define DEFAULT_SOFTWARE_DEPTH_TYPE GLushort
56 #define DEFAULT_SOFTWARE_DEPTH_TYPE GLuint
61 * Max image/surface/texture size.
63 #define SWRAST_MAX_WIDTH 16384
64 #define SWRAST_MAX_HEIGHT 16384
69 * \brief Data-structure to handle vertices in the software rasterizer.
71 * The software rasterizer now uses this format for vertices. Thus a
72 * 'RasterSetup' stage or other translation is required between the
73 * tnl module and the swrast rasterization functions. This serves to
74 * isolate the swrast module from the internals of the tnl module, and
75 * improve its usefulness as a fallback mechanism for hardware
78 * wpos = attr[VARYING_SLOT_POS] and MUST BE THE FIRST values in the
79 * vertex because of the tnl clipping code.
81 * wpos[0] and [1] are the screen-coords of SWvertex.
82 * wpos[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]).
83 * wpos[3] is 1/w where w is the clip-space W coord. This is the value
84 * that clip{XYZ} were multiplied by to get ndc{XYZ}.
86 * Full software drivers:
87 * - Register the rastersetup and triangle functions from
88 * utils/software_helper.
89 * - On statechange, update the rasterization pointers in that module.
91 * Rasterization hardware drivers:
92 * - Keep native rastersetup.
93 * - Implement native twoside,offset and unfilled triangle setup.
94 * - Implement a translator from native vertices to swrast vertices.
95 * - On partial fallback (mix of accelerated and unaccelerated
96 * prims), call a pass-through function which translates native
97 * vertices to SWvertices and calls the appropriate swrast function.
98 * - On total fallback (vertex format insufficient for state or all
99 * primitives unaccelerated), hook in swrast_setup instead.
102 GLfloat attrib[VARYING_SLOT_MAX][4];
103 GLchan color[4]; /** integer color */
108 #define VARYING_SLOT_CI VARYING_SLOT_COL0
111 struct swrast_device_driver;
114 /* These are the public-access functions exported from swrast.
118 _swrast_CreateContext( struct gl_context *ctx );
121 _swrast_DestroyContext( struct gl_context *ctx );
123 /* Get a (non-const) reference to the device driver struct for swrast.
125 extern struct swrast_device_driver *
126 _swrast_GetDeviceDriverReference( struct gl_context *ctx );
129 _swrast_Bitmap( struct gl_context *ctx,
131 GLsizei width, GLsizei height,
132 const struct gl_pixelstore_attrib *unpack,
133 const GLubyte *bitmap );
136 _swrast_CopyPixels( struct gl_context *ctx,
137 GLint srcx, GLint srcy,
138 GLint destx, GLint desty,
139 GLsizei width, GLsizei height,
143 swrast_fast_copy_pixels(struct gl_context *ctx,
144 GLint srcX, GLint srcY, GLsizei width, GLsizei height,
145 GLint dstX, GLint dstY, GLenum type);
148 _swrast_DrawPixels( struct gl_context *ctx,
150 GLsizei width, GLsizei height,
151 GLenum format, GLenum type,
152 const struct gl_pixelstore_attrib *unpack,
153 const GLvoid *pixels );
156 _swrast_BlitFramebuffer(struct gl_context *ctx,
157 GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
158 GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
159 GLbitfield mask, GLenum filter);
162 _swrast_Clear(struct gl_context *ctx, GLbitfield buffers);
166 /* Reset the stipple counter
169 _swrast_ResetLineStipple( struct gl_context *ctx );
172 * Indicates front/back facing for subsequent points/lines when drawing
173 * unfilled polygons. Needed for two-side stencil.
176 _swrast_SetFacing(struct gl_context *ctx, GLuint facing);
178 /* These will always render the correct point/line/triangle for the
181 * For flatshaded primitives, the provoking vertex is the final one.
184 _swrast_Point( struct gl_context *ctx, const SWvertex *v );
187 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 );
190 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
191 const SWvertex *v1, const SWvertex *v2 );
194 _swrast_Quad( struct gl_context *ctx,
195 const SWvertex *v0, const SWvertex *v1,
196 const SWvertex *v2, const SWvertex *v3);
199 _swrast_flush( struct gl_context *ctx );
202 _swrast_render_primitive( struct gl_context *ctx, GLenum mode );
205 _swrast_render_start( struct gl_context *ctx );
208 _swrast_render_finish( struct gl_context *ctx );
210 extern struct gl_texture_image *
211 _swrast_new_texture_image( struct gl_context *ctx );
214 _swrast_delete_texture_image(struct gl_context *ctx,
215 struct gl_texture_image *texImage);
218 _swrast_alloc_texture_image_buffer(struct gl_context *ctx,
219 struct gl_texture_image *texImage);
222 _swrast_init_texture_image(struct gl_texture_image *texImage);
225 _swrast_free_texture_image_buffer(struct gl_context *ctx,
226 struct gl_texture_image *texImage);
229 _swrast_map_teximage(struct gl_context *ctx,
230 struct gl_texture_image *texImage,
232 GLuint x, GLuint y, GLuint w, GLuint h,
235 GLint *rowStrideOut);
238 _swrast_unmap_teximage(struct gl_context *ctx,
239 struct gl_texture_image *texImage,
242 /* Tell the software rasterizer about core state changes.
245 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state );
247 /* Configure software rasterizer to match hardware rasterizer characteristics:
250 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value );
253 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value );
258 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v );
263 _swrast_eject_texture_images(struct gl_context *ctx);
267 _swrast_render_texture(struct gl_context *ctx,
268 struct gl_framebuffer *fb,
269 struct gl_renderbuffer_attachment *att);
272 _swrast_finish_render_texture(struct gl_context *ctx,
273 struct gl_renderbuffer *rb);
277 * The driver interface for the software rasterizer.
278 * XXX this may go away.
279 * We may move these functions to ctx->Driver.RenderStart, RenderEnd.
281 struct swrast_device_driver {
283 * These are called before and after accessing renderbuffers during
284 * software rasterization.
286 * These are a suitable place for grabbing/releasing hardware locks.
288 * NOTE: The swrast triangle/line/point routines *DO NOT* call
289 * these functions. Locking in that case must be organized by the
290 * driver by other mechanisms.
292 void (*SpanRenderStart)(struct gl_context *ctx);
293 void (*SpanRenderFinish)(struct gl_context *ctx);