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264 lines
8 KiB
C
264 lines
8 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.5
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*
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* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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/**
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* \file swrast/swrast.h
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* \brief Public interface to the software rasterization functions.
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* \author Keith Whitwell <keith@tungstengraphics.com>
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*/
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#ifndef SWRAST_H
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#define SWRAST_H
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#include "main/mtypes.h"
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#include "swrast/s_chan.h"
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/**
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* \struct SWvertex
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* \brief Data-structure to handle vertices in the software rasterizer.
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*
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* The software rasterizer now uses this format for vertices. Thus a
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* 'RasterSetup' stage or other translation is required between the
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* tnl module and the swrast rasterization functions. This serves to
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* isolate the swrast module from the internals of the tnl module, and
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* improve its usefulness as a fallback mechanism for hardware
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* drivers.
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*
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* wpos = attr[FRAG_ATTRIB_WPOS] and MUST BE THE FIRST values in the
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* vertex because of the tnl clipping code.
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* wpos[0] and [1] are the screen-coords of SWvertex.
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* wpos[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]).
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* wpos[3] is 1/w where w is the clip-space W coord. This is the value
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* that clip{XYZ} were multiplied by to get ndc{XYZ}.
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*
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* Full software drivers:
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* - Register the rastersetup and triangle functions from
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* utils/software_helper.
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* - On statechange, update the rasterization pointers in that module.
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*
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* Rasterization hardware drivers:
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* - Keep native rastersetup.
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* - Implement native twoside,offset and unfilled triangle setup.
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* - Implement a translator from native vertices to swrast vertices.
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* - On partial fallback (mix of accelerated and unaccelerated
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* prims), call a pass-through function which translates native
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* vertices to SWvertices and calls the appropriate swrast function.
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* - On total fallback (vertex format insufficient for state or all
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* primitives unaccelerated), hook in swrast_setup instead.
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*/
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typedef struct {
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GLfloat attrib[FRAG_ATTRIB_MAX][4];
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GLchan color[4]; /** integer color */
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GLfloat pointSize;
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} SWvertex;
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#define FRAG_ATTRIB_CI FRAG_ATTRIB_COL
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struct swrast_device_driver;
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/* These are the public-access functions exported from swrast.
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*/
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extern GLboolean
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_swrast_CreateContext( struct gl_context *ctx );
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extern void
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_swrast_DestroyContext( struct gl_context *ctx );
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/* Get a (non-const) reference to the device driver struct for swrast.
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*/
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extern struct swrast_device_driver *
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_swrast_GetDeviceDriverReference( struct gl_context *ctx );
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extern void
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_swrast_Bitmap( struct gl_context *ctx,
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GLint px, GLint py,
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GLsizei width, GLsizei height,
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const struct gl_pixelstore_attrib *unpack,
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const GLubyte *bitmap );
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extern void
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_swrast_CopyPixels( struct gl_context *ctx,
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GLint srcx, GLint srcy,
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GLint destx, GLint desty,
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GLsizei width, GLsizei height,
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GLenum type );
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extern GLboolean
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swrast_fast_copy_pixels(struct gl_context *ctx,
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GLint srcX, GLint srcY, GLsizei width, GLsizei height,
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GLint dstX, GLint dstY, GLenum type);
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extern void
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_swrast_DrawPixels( struct gl_context *ctx,
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GLint x, GLint y,
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GLsizei width, GLsizei height,
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GLenum format, GLenum type,
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const struct gl_pixelstore_attrib *unpack,
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const GLvoid *pixels );
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extern void
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_swrast_Clear(struct gl_context *ctx, GLbitfield buffers);
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/* Reset the stipple counter
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*/
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extern void
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_swrast_ResetLineStipple( struct gl_context *ctx );
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/* These will always render the correct point/line/triangle for the
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* current state.
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*
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* For flatshaded primitives, the provoking vertex is the final one.
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*/
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extern void
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_swrast_Point( struct gl_context *ctx, const SWvertex *v );
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extern void
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_swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 );
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extern void
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_swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
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const SWvertex *v1, const SWvertex *v2 );
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extern void
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_swrast_Quad( struct gl_context *ctx,
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const SWvertex *v0, const SWvertex *v1,
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const SWvertex *v2, const SWvertex *v3);
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extern void
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_swrast_flush( struct gl_context *ctx );
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extern void
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_swrast_render_primitive( struct gl_context *ctx, GLenum mode );
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extern void
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_swrast_render_start( struct gl_context *ctx );
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extern void
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_swrast_render_finish( struct gl_context *ctx );
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extern struct gl_texture_image *
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_swrast_new_texture_image( struct gl_context *ctx );
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extern void
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_swrast_delete_texture_image(struct gl_context *ctx,
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struct gl_texture_image *texImage);
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extern GLboolean
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_swrast_alloc_texture_image_buffer(struct gl_context *ctx,
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struct gl_texture_image *texImage,
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gl_format format, GLsizei width,
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GLsizei height, GLsizei depth);
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extern void
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_swrast_init_texture_image(struct gl_texture_image *texImage, GLsizei width,
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GLsizei height, GLsizei depth);
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extern void
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_swrast_free_texture_image_buffer(struct gl_context *ctx,
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struct gl_texture_image *texImage);
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extern void
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_swrast_map_teximage(struct gl_context *ctx,
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struct gl_texture_image *texImage,
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GLuint slice,
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GLuint x, GLuint y, GLuint w, GLuint h,
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GLbitfield mode,
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GLubyte **mapOut,
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GLint *rowStrideOut);
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extern void
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_swrast_unmap_teximage(struct gl_context *ctx,
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struct gl_texture_image *texImage,
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GLuint slice);
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/* Tell the software rasterizer about core state changes.
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*/
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extern void
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_swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state );
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/* Configure software rasterizer to match hardware rasterizer characteristics:
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*/
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extern void
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_swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value );
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extern void
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_swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value );
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/* Debug:
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*/
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extern void
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_swrast_print_vertex( struct gl_context *ctx, const SWvertex *v );
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extern void
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_swrast_eject_texture_images(struct gl_context *ctx);
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extern void
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_swrast_render_texture(struct gl_context *ctx,
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struct gl_framebuffer *fb,
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struct gl_renderbuffer_attachment *att);
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extern GLboolean
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_swrast_AllocTextureStorage(struct gl_context *ctx,
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struct gl_texture_object *texObj,
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GLsizei levels, GLsizei width,
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GLsizei height, GLsizei depth);
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/**
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* The driver interface for the software rasterizer.
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* XXX this may go away.
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* We may move these functions to ctx->Driver.RenderStart, RenderEnd.
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*/
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struct swrast_device_driver {
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/*
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* These are called before and after accessing renderbuffers during
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* software rasterization.
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*
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* These are a suitable place for grabbing/releasing hardware locks.
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*
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* NOTE: The swrast triangle/line/point routines *DO NOT* call
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* these functions. Locking in that case must be organized by the
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* driver by other mechanisms.
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*/
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void (*SpanRenderStart)(struct gl_context *ctx);
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void (*SpanRenderFinish)(struct gl_context *ctx);
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};
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#endif
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