use EMIT_1F or EMIT_4F for fog depending on fragment program (bug 10788)
[mesa.git] / src / mesa / swrast_setup / ss_context.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.5.3
4 *
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 * Keith Whitwell <keith@tungstengraphics.com>
26 */
27
28 #include "glheader.h"
29 #include "imports.h"
30 #include "colormac.h"
31 #include "ss_context.h"
32 #include "ss_triangle.h"
33 #include "swrast_setup.h"
34 #include "tnl/tnl.h"
35 #include "tnl/t_context.h"
36 #include "tnl/t_pipeline.h"
37 #include "tnl/t_vertex.h"
38
39 /* Need to check lighting state and vertex program state to know
40 * if two-sided lighting is in effect.
41 */
42 #define _SWSETUP_NEW_RENDERINDEX (_NEW_POLYGON|_NEW_LIGHT|_NEW_PROGRAM)
43
44
45 #define VARYING_EMIT_STYLE EMIT_4F
46
47
48 GLboolean
49 _swsetup_CreateContext( GLcontext *ctx )
50 {
51 SScontext *swsetup = (SScontext *)CALLOC(sizeof(SScontext));
52
53 if (!swsetup)
54 return GL_FALSE;
55
56 ctx->swsetup_context = swsetup;
57
58 swsetup->NewState = ~0;
59 _swsetup_trifuncs_init( ctx );
60
61 _tnl_init_vertices( ctx, ctx->Const.MaxArrayLockSize + 12,
62 sizeof(SWvertex) );
63
64
65 return GL_TRUE;
66 }
67
68 void
69 _swsetup_DestroyContext( GLcontext *ctx )
70 {
71 SScontext *swsetup = SWSETUP_CONTEXT(ctx);
72
73 if (swsetup) {
74 FREE(swsetup);
75 ctx->swsetup_context = 0;
76 }
77
78 _tnl_free_vertices( ctx );
79 }
80
81 static void
82 _swsetup_RenderPrimitive( GLcontext *ctx, GLenum mode )
83 {
84 SWSETUP_CONTEXT(ctx)->render_prim = mode;
85 _swrast_render_primitive( ctx, mode );
86 }
87
88
89 /**
90 * Helper macros for setup_vertex_format()
91 */
92 #define SWZ ((SWvertex *)0)
93 #define SWOffset(MEMBER) (((char *)&(SWZ->MEMBER)) - ((char *)SWZ))
94
95 #define EMIT_ATTR( ATTR, STYLE, MEMBER ) \
96 do { \
97 map[e].attrib = (ATTR); \
98 map[e].format = (STYLE); \
99 map[e].offset = SWOffset(MEMBER); \
100 e++; \
101 } while (0)
102
103
104 /**
105 * Tell the tnl module how to build SWvertex objects for swrast.
106 * We'll build the map[] array with that info and pass it to
107 * _tnl_install_attrs().
108 */
109 static void
110 setup_vertex_format(GLcontext *ctx)
111 {
112 TNLcontext *tnl = TNL_CONTEXT(ctx);
113 SScontext *swsetup = SWSETUP_CONTEXT(ctx);
114
115 if (!RENDERINPUTS_EQUAL(tnl->render_inputs_bitset,
116 swsetup->last_index_bitset)) {
117 DECLARE_RENDERINPUTS(index_bitset);
118 struct tnl_attr_map map[_TNL_ATTRIB_MAX];
119 int i, e = 0;
120
121 RENDERINPUTS_COPY( index_bitset, tnl->render_inputs_bitset );
122
123 EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, win );
124
125 if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR0 ))
126 EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4CHAN_4F_RGBA, color );
127
128 if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR1 ))
129 EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_4CHAN_4F_RGBA, specular);
130
131 if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR_INDEX ))
132 EMIT_ATTR( _TNL_ATTRIB_COLOR_INDEX, EMIT_1F, index );
133
134 if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG )) {
135 const GLint emit = ctx->FragmentProgram._Current ? EMIT_4F : EMIT_1F;
136 EMIT_ATTR( _TNL_ATTRIB_FOG, emit, attrib[FRAG_ATTRIB_FOGC]);
137 }
138
139 if (RENDERINPUTS_TEST_RANGE(index_bitset, _TNL_FIRST_TEX, _TNL_LAST_TEX))
140 {
141 for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
142 if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX(i) )) {
143 EMIT_ATTR( _TNL_ATTRIB_TEX(i), EMIT_4F,
144 attrib[FRAG_ATTRIB_TEX0 + i] );
145 }
146 }
147 }
148
149 /* shader varying vars */
150 if (RENDERINPUTS_TEST_RANGE( index_bitset,
151 _TNL_FIRST_GENERIC, _TNL_LAST_GENERIC )) {
152 for (i = 0; i < ctx->Const.MaxVarying; i++) {
153 if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_GENERIC(i) )) {
154 EMIT_ATTR( _TNL_ATTRIB_GENERIC(i), VARYING_EMIT_STYLE,
155 attrib[FRAG_ATTRIB_VAR0 + i] );
156 }
157 }
158 }
159
160 if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_POINTSIZE ))
161 EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, pointSize );
162
163 _tnl_install_attrs( ctx, map, e,
164 ctx->Viewport._WindowMap.m,
165 sizeof(SWvertex) );
166
167 RENDERINPUTS_COPY( swsetup->last_index_bitset, index_bitset );
168 }
169 }
170
171
172 /**
173 * Prepare to render a vertex buffer.
174 * Called via tnl->Driver.Render.Start.
175 */
176 static void
177 _swsetup_RenderStart( GLcontext *ctx )
178 {
179 SScontext *swsetup = SWSETUP_CONTEXT(ctx);
180 TNLcontext *tnl = TNL_CONTEXT(ctx);
181 struct vertex_buffer *VB = &tnl->vb;
182
183 if (swsetup->NewState & _SWSETUP_NEW_RENDERINDEX) {
184 _swsetup_choose_trifuncs(ctx);
185 }
186
187 swsetup->NewState = 0;
188
189 _swrast_render_start(ctx);
190
191 /* Important */
192 VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
193
194 setup_vertex_format(ctx);
195 }
196
197
198 /*
199 * We patch this function into tnl->Driver.Render.Finish.
200 * It's called when we finish rendering a vertex buffer.
201 */
202 static void
203 _swsetup_RenderFinish( GLcontext *ctx )
204 {
205 _swrast_render_finish( ctx );
206 }
207
208 void
209 _swsetup_InvalidateState( GLcontext *ctx, GLuint new_state )
210 {
211 SScontext *swsetup = SWSETUP_CONTEXT(ctx);
212 swsetup->NewState |= new_state;
213 _tnl_invalidate_vertex_state( ctx, new_state );
214 }
215
216
217 void
218 _swsetup_Wakeup( GLcontext *ctx )
219 {
220 TNLcontext *tnl = TNL_CONTEXT(ctx);
221 SScontext *swsetup = SWSETUP_CONTEXT(ctx);
222
223 tnl->Driver.Render.Start = _swsetup_RenderStart;
224 tnl->Driver.Render.Finish = _swsetup_RenderFinish;
225 tnl->Driver.Render.PrimitiveNotify = _swsetup_RenderPrimitive;
226 tnl->Driver.Render.Interp = _tnl_interp;
227 tnl->Driver.Render.CopyPV = _tnl_copy_pv;
228 tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon; /* new */
229 tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine; /* new */
230 /* points */
231 /* line */
232 /* triangle */
233 /* quad */
234 tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
235 tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
236 tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
237 tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
238 tnl->Driver.Render.Multipass = 0;
239
240 _tnl_invalidate_vertices( ctx, ~0 );
241 _tnl_need_projected_coords( ctx, GL_TRUE );
242 _swsetup_InvalidateState( ctx, ~0 );
243
244 swsetup->verts = (SWvertex *)tnl->clipspace.vertex_buf;
245 RENDERINPUTS_ZERO( swsetup->last_index_bitset );
246 }
247
248
249 /**
250 * Populate a swrast SWvertex from an attrib-style vertex.
251 */
252 void
253 _swsetup_Translate( GLcontext *ctx, const void *vertex, SWvertex *dest )
254 {
255 const GLfloat *m = ctx->Viewport._WindowMap.m;
256 GLfloat tmp[4];
257 GLuint i;
258
259 _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POS, tmp );
260
261 dest->win[0] = m[0] * tmp[0] + m[12];
262 dest->win[1] = m[5] * tmp[1] + m[13];
263 dest->win[2] = m[10] * tmp[2] + m[14];
264 dest->win[3] = tmp[3];
265
266
267 for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
268 _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_TEX0+i,
269 dest->attrib[FRAG_ATTRIB_TEX0 + i] );
270
271 for (i = 0 ; i < ctx->Const.MaxVarying ; i++)
272 _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_GENERIC0+i,
273 dest->attrib[FRAG_ATTRIB_VAR0 + i] );
274
275 _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR0, tmp );
276 UNCLAMPED_FLOAT_TO_RGBA_CHAN( dest->color, tmp );
277
278 _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR1, tmp );
279 UNCLAMPED_FLOAT_TO_RGBA_CHAN( dest->specular, tmp );
280
281 _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_FOG, tmp );
282 dest->attrib[FRAG_ATTRIB_FOGC][0] = tmp[0];
283
284 _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_COLOR_INDEX, tmp );
285 dest->index = tmp[0];
286
287 _tnl_get_attr( ctx, vertex, _TNL_ATTRIB_POINTSIZE, tmp );
288 dest->pointSize = tmp[0];
289 }
290