1/**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28/*
29 * Generate fragment programs to implement pixel transfer ops, such as
30 * scale/bias, colortable, convolution...
31 *
32 * Authors:
33 *   Brian Paul
34 */
35
36#include "main/imports.h"
37#include "main/image.h"
38#include "main/macros.h"
39#include "program/program.h"
40#include "program/prog_cache.h"
41#include "program/prog_instruction.h"
42#include "program/prog_parameter.h"
43#include "program/prog_print.h"
44
45#include "st_context.h"
46#include "st_format.h"
47#include "st_texture.h"
48
49#include "pipe/p_screen.h"
50#include "pipe/p_context.h"
51#include "util/u_inlines.h"
52#include "util/u_pack_color.h"
53
54
55struct state_key
56{
57   GLuint scaleAndBias:1;
58   GLuint pixelMaps:1;
59
60#if 0
61   GLfloat Maps[3][256][4];
62   int NumMaps;
63   GLint NumStages;
64   pipeline_stage Stages[STAGE_MAX];
65   GLboolean StagesUsed[STAGE_MAX];
66   GLfloat Scale1[4], Bias1[4];
67   GLfloat Scale2[4], Bias2[4];
68#endif
69};
70
71static void
72make_state_key(struct gl_context *ctx,  struct state_key *key)
73{
74   memset(key, 0, sizeof(*key));
75
76   if (ctx->Pixel.RedBias != 0.0 || ctx->Pixel.RedScale != 1.0 ||
77       ctx->Pixel.GreenBias != 0.0 || ctx->Pixel.GreenScale != 1.0 ||
78       ctx->Pixel.BlueBias != 0.0 || ctx->Pixel.BlueScale != 1.0 ||
79       ctx->Pixel.AlphaBias != 0.0 || ctx->Pixel.AlphaScale != 1.0) {
80      key->scaleAndBias = 1;
81   }
82
83   key->pixelMaps = ctx->Pixel.MapColorFlag;
84}
85
86
87/**
88 * Update the pixelmap texture with the contents of the R/G/B/A pixel maps.
89 */
90static void
91load_color_map_texture(struct gl_context *ctx, struct pipe_resource *pt)
92{
93   struct st_context *st = st_context(ctx);
94   struct pipe_context *pipe = st->pipe;
95   struct pipe_transfer *transfer;
96   const GLuint rSize = ctx->PixelMaps.RtoR.Size;
97   const GLuint gSize = ctx->PixelMaps.GtoG.Size;
98   const GLuint bSize = ctx->PixelMaps.BtoB.Size;
99   const GLuint aSize = ctx->PixelMaps.AtoA.Size;
100   const uint texSize = pt->width0;
101   uint *dest;
102   uint i, j;
103
104   transfer = pipe_get_transfer(pipe,
105                                pt, 0, 0, PIPE_TRANSFER_WRITE,
106                                0, 0, texSize, texSize);
107   dest = (uint *) pipe_transfer_map(pipe, transfer);
108
109   /* Pack four 1D maps into a 2D texture:
110    * R map is placed horizontally, indexed by S, in channel 0
111    * G map is placed vertically, indexed by T, in channel 1
112    * B map is placed horizontally, indexed by S, in channel 2
113    * A map is placed vertically, indexed by T, in channel 3
114    */
115   for (i = 0; i < texSize; i++) {
116      for (j = 0; j < texSize; j++) {
117         union util_color uc;
118         int k = (i * texSize + j);
119         float rgba[4];
120         rgba[0] = ctx->PixelMaps.RtoR.Map[j * rSize / texSize];
121         rgba[1] = ctx->PixelMaps.GtoG.Map[i * gSize / texSize];
122         rgba[2] = ctx->PixelMaps.BtoB.Map[j * bSize / texSize];
123         rgba[3] = ctx->PixelMaps.AtoA.Map[i * aSize / texSize];
124         util_pack_color(rgba, pt->format, &uc);
125         *(dest + k) = uc.ui;
126      }
127   }
128
129   pipe_transfer_unmap(pipe, transfer);
130   pipe->transfer_destroy(pipe, transfer);
131}
132
133
134
135#define MAX_INST 100
136
137/**
138 * Returns a fragment program which implements the current pixel transfer ops.
139 */
140static struct gl_fragment_program *
141get_pixel_transfer_program(struct gl_context *ctx, const struct state_key *key)
142{
143   struct st_context *st = st_context(ctx);
144   struct prog_instruction inst[MAX_INST];
145   struct gl_program_parameter_list *params;
146   struct gl_fragment_program *fp;
147   GLuint ic = 0;
148   const GLuint colorTemp = 0;
149
150   fp = (struct gl_fragment_program *)
151      ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
152   if (!fp)
153      return NULL;
154
155   params = _mesa_new_parameter_list();
156
157   /*
158    * Get initial pixel color from the texture.
159    * TEX colorTemp, fragment.texcoord[0], texture[0], 2D;
160    */
161   _mesa_init_instructions(inst + ic, 1);
162   inst[ic].Opcode = OPCODE_TEX;
163   inst[ic].DstReg.File = PROGRAM_TEMPORARY;
164   inst[ic].DstReg.Index = colorTemp;
165   inst[ic].SrcReg[0].File = PROGRAM_INPUT;
166   inst[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
167   inst[ic].TexSrcUnit = 0;
168   inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
169   ic++;
170   fp->Base.InputsRead = BITFIELD64_BIT(FRAG_ATTRIB_TEX0);
171   fp->Base.OutputsWritten = BITFIELD64_BIT(FRAG_RESULT_COLOR);
172   fp->Base.SamplersUsed = 0x1;  /* sampler 0 (bit 0) is used */
173
174   if (key->scaleAndBias) {
175      static const gl_state_index scale_state[STATE_LENGTH] =
176         { STATE_INTERNAL, STATE_PT_SCALE, 0, 0, 0 };
177      static const gl_state_index bias_state[STATE_LENGTH] =
178         { STATE_INTERNAL, STATE_PT_BIAS, 0, 0, 0 };
179      GLint scale_p, bias_p;
180
181      scale_p = _mesa_add_state_reference(params, scale_state);
182      bias_p = _mesa_add_state_reference(params, bias_state);
183
184      /* MAD colorTemp, colorTemp, scale, bias; */
185      _mesa_init_instructions(inst + ic, 1);
186      inst[ic].Opcode = OPCODE_MAD;
187      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
188      inst[ic].DstReg.Index = colorTemp;
189      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
190      inst[ic].SrcReg[0].Index = colorTemp;
191      inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
192      inst[ic].SrcReg[1].Index = scale_p;
193      inst[ic].SrcReg[2].File = PROGRAM_STATE_VAR;
194      inst[ic].SrcReg[2].Index = bias_p;
195      ic++;
196   }
197
198   if (key->pixelMaps) {
199      const GLuint temp = 1;
200
201      /* create the colormap/texture now if not already done */
202      if (!st->pixel_xfer.pixelmap_texture) {
203         st->pixel_xfer.pixelmap_texture = st_create_color_map_texture(ctx);
204         st->pixel_xfer.pixelmap_sampler_view =
205            st_create_texture_sampler_view(st->pipe,
206                                           st->pixel_xfer.pixelmap_texture);
207      }
208
209      /* with a little effort, we can do four pixel map look-ups with
210       * two TEX instructions:
211       */
212
213      /* TEX temp.rg, colorTemp.rgba, texture[1], 2D; */
214      _mesa_init_instructions(inst + ic, 1);
215      inst[ic].Opcode = OPCODE_TEX;
216      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
217      inst[ic].DstReg.Index = temp;
218      inst[ic].DstReg.WriteMask = WRITEMASK_XY; /* write R,G */
219      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
220      inst[ic].SrcReg[0].Index = colorTemp;
221      inst[ic].TexSrcUnit = 1;
222      inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
223      ic++;
224
225      /* TEX temp.ba, colorTemp.baba, texture[1], 2D; */
226      _mesa_init_instructions(inst + ic, 1);
227      inst[ic].Opcode = OPCODE_TEX;
228      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
229      inst[ic].DstReg.Index = temp;
230      inst[ic].DstReg.WriteMask = WRITEMASK_ZW; /* write B,A */
231      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
232      inst[ic].SrcReg[0].Index = colorTemp;
233      inst[ic].SrcReg[0].Swizzle = MAKE_SWIZZLE4(SWIZZLE_Z, SWIZZLE_W,
234                                                 SWIZZLE_Z, SWIZZLE_W);
235      inst[ic].TexSrcUnit = 1;
236      inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
237      ic++;
238
239      /* MOV colorTemp, temp; */
240      _mesa_init_instructions(inst + ic, 1);
241      inst[ic].Opcode = OPCODE_MOV;
242      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
243      inst[ic].DstReg.Index = colorTemp;
244      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
245      inst[ic].SrcReg[0].Index = temp;
246      ic++;
247
248      fp->Base.SamplersUsed |= (1 << 1);  /* sampler 1 is used */
249   }
250
251   /* Modify last instruction's dst reg to write to result.color */
252   {
253      struct prog_instruction *last = &inst[ic - 1];
254      last->DstReg.File = PROGRAM_OUTPUT;
255      last->DstReg.Index = FRAG_RESULT_COLOR;
256   }
257
258   /* END; */
259   _mesa_init_instructions(inst + ic, 1);
260   inst[ic].Opcode = OPCODE_END;
261   ic++;
262
263   assert(ic <= MAX_INST);
264
265
266   fp->Base.Instructions = _mesa_alloc_instructions(ic);
267   if (!fp->Base.Instructions) {
268      _mesa_error(ctx, GL_OUT_OF_MEMORY,
269                  "generating pixel transfer program");
270      _mesa_free_parameter_list(params);
271      return NULL;
272   }
273
274   _mesa_copy_instructions(fp->Base.Instructions, inst, ic);
275   fp->Base.NumInstructions = ic;
276   fp->Base.Parameters = params;
277
278#if 0
279   printf("========= pixel transfer prog\n");
280   _mesa_print_program(&fp->Base);
281   _mesa_print_parameter_list(fp->Base.Parameters);
282#endif
283
284   return fp;
285}
286
287
288
289/**
290 * Update st->pixel_xfer.program in response to new pixel-transfer state.
291 */
292static void
293update_pixel_transfer(struct st_context *st)
294{
295   struct gl_context *ctx = st->ctx;
296   struct state_key key;
297   struct gl_fragment_program *fp;
298
299   make_state_key(st->ctx, &key);
300
301   fp = (struct gl_fragment_program *)
302      _mesa_search_program_cache(st->pixel_xfer.cache, &key, sizeof(key));
303   if (!fp) {
304      fp = get_pixel_transfer_program(st->ctx, &key);
305      _mesa_program_cache_insert(st->ctx, st->pixel_xfer.cache,
306                                 &key, sizeof(key), &fp->Base);
307   }
308
309   if (ctx->Pixel.MapColorFlag) {
310      load_color_map_texture(ctx, st->pixel_xfer.pixelmap_texture);
311   }
312   st->pixel_xfer.pixelmap_enabled = ctx->Pixel.MapColorFlag;
313
314   st->pixel_xfer.program = (struct st_fragment_program *) fp;
315}
316
317
318
319const struct st_tracked_state st_update_pixel_transfer = {
320   "st_update_pixel_transfer",				/* name */
321   {							/* dirty */
322      _NEW_PIXEL,					/* mesa */
323      0,						/* st */
324   },
325   update_pixel_transfer				/* update */
326};
327