2 * Copyright (C) 2009 Maciej Cencora <m.cencora@gmail.com>
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a 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, sublicense, 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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial
16 * portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 * Fragment program compiler. Perform transformations on the intermediate
32 * representation until the program is in a form where we can translate
33 * it more or less directly into machine-readable form.
35 * \author Ben Skeggs <darktama@iinet.net.au>
36 * \author Jerome Glisse <j.glisse@gmail.com>
39 #include "r300_fragprog_common.h"
41 #include "program/prog_print.h"
43 #include "compiler/radeon_compiler.h"
45 #include "radeon_mesa_to_rc.h"
48 static GLuint build_dts(GLuint depthmode)
52 case GL_LUMINANCE: return RC_SWIZZLE_XYZZ;
53 case GL_INTENSITY: return RC_SWIZZLE_XYZW;
54 case GL_ALPHA: return RC_SWIZZLE_WWWW;
58 static GLuint build_func(GLuint comparefunc)
60 return comparefunc - GL_NEVER;
64 * Collect all external state that is relevant for compiling the given
67 static void build_state(
69 struct gl_fragment_program *fp,
70 struct r300_fragment_program_external_state *state)
74 memset(state, 0, sizeof(*state));
76 for(unit = 0; unit < 16; ++unit) {
77 if (fp->Base.ShadowSamplers & (1 << unit)) {
78 struct gl_texture_object* tex = r300->radeon.glCtx->Texture.Unit[unit]._Current;
80 state->unit[unit].texture_swizzle = build_dts(tex->Sampler.DepthMode);
81 state->unit[unit].texture_compare_func = build_func(tex->Sampler.CompareFunc);
88 * Transform the program to support fragment.position.
90 * Introduce a small fragment at the start of the program that will be
91 * the only code that directly reads the FRAG_ATTRIB_WPOS input.
92 * All other code pieces that reference that input will be rewritten
93 * to read from a newly allocated temporary.
96 static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler, struct r300_fragment_program * fp)
100 fp->wpos_attr = FRAG_ATTRIB_MAX;
101 if (!(compiler->Base.Program.InputsRead & FRAG_BIT_WPOS)) {
105 for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
107 if (!(compiler->Base.Program.InputsRead & (1 << i))) {
113 /* No free texcoord found, fall-back to software rendering */
114 if (fp->wpos_attr == FRAG_ATTRIB_MAX)
116 compiler->Base.Error = 1;
120 rc_transform_fragment_wpos(&compiler->Base, FRAG_ATTRIB_WPOS, fp->wpos_attr, GL_FALSE);
124 * Rewrite fragment.fogcoord to use a texture coordinate slot.
125 * Note that fogcoord is forced into an X001 pattern, and this enforcement
128 * See also the counterpart rewriting for vertex programs.
130 static void rewriteFog(struct r300_fragment_program_compiler *compiler, struct r300_fragment_program * fp)
132 struct rc_src_register src;
135 fp->fog_attr = FRAG_ATTRIB_MAX;
136 if (!(compiler->Base.Program.InputsRead & FRAG_BIT_FOGC)) {
140 for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
142 if (!(compiler->Base.Program.InputsRead & (1 << i))) {
148 /* No free texcoord found, fall-back to software rendering */
149 if (fp->fog_attr == FRAG_ATTRIB_MAX)
151 compiler->Base.Error = 1;
155 memset(&src, 0, sizeof(src));
156 src.File = RC_FILE_INPUT;
157 src.Index = fp->fog_attr;
158 src.Swizzle = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, SWIZZLE_ZERO, SWIZZLE_ONE);
159 rc_move_input(&compiler->Base, FRAG_ATTRIB_FOGC, src);
164 * Reserve hardware temporary registers for the program inputs.
166 * @note This allocation is performed explicitly, because the order of inputs
167 * is determined by the RS hardware.
169 static void allocate_hw_inputs(
170 struct r300_fragment_program_compiler * c,
171 void (*allocate)(void * data, unsigned input, unsigned hwreg),
174 GLuint InputsRead = c->Base.Program.InputsRead;
179 if (InputsRead & FRAG_BIT_COL0)
180 allocate(mydata, FRAG_ATTRIB_COL0, hwindex++);
181 InputsRead &= ~FRAG_BIT_COL0;
183 /* Secondary color */
184 if (InputsRead & FRAG_BIT_COL1)
185 allocate(mydata, FRAG_ATTRIB_COL1, hwindex++);
186 InputsRead &= ~FRAG_BIT_COL1;
189 for (i = 0; i < 8; i++) {
190 if (InputsRead & (FRAG_BIT_TEX0 << i))
191 allocate(mydata, FRAG_ATTRIB_TEX0+i, hwindex++);
193 InputsRead &= ~FRAG_BITS_TEX_ANY;
195 /* Fogcoords treated as a texcoord */
196 if (InputsRead & FRAG_BIT_FOGC)
197 allocate(mydata, FRAG_ATTRIB_FOGC, hwindex++);
198 InputsRead &= ~FRAG_BIT_FOGC;
200 /* fragment position treated as a texcoord */
201 if (InputsRead & FRAG_BIT_WPOS)
202 allocate(mydata, FRAG_ATTRIB_WPOS, hwindex++);
203 InputsRead &= ~FRAG_BIT_WPOS;
207 rc_error(&c->Base, "Don't know how to handle inputs 0x%x\n", InputsRead);
211 static void translate_fragment_program(struct gl_context *ctx, struct r300_fragment_program_cont *cont, struct r300_fragment_program *fp)
213 r300ContextPtr r300 = R300_CONTEXT(ctx);
214 struct r300_fragment_program_compiler compiler;
216 memset(&compiler, 0, sizeof(compiler));
217 rc_init(&compiler.Base);
218 compiler.Base.Debug = (RADEON_DEBUG & RADEON_PIXEL) ? GL_TRUE : GL_FALSE;
220 compiler.code = &fp->code;
221 compiler.state = fp->state;
222 compiler.enable_shadow_ambient = GL_TRUE;
223 compiler.Base.is_r500 = (r300->radeon.radeonScreen->chip_family >= CHIP_FAMILY_RV515) ? GL_TRUE : GL_FALSE;
224 compiler.Base.disable_optimizations = 0;
225 compiler.Base.has_half_swizzles = 1;
226 compiler.Base.max_temp_regs = (compiler.Base.is_r500) ? 128 : 32;
227 compiler.Base.max_constants = compiler.Base.is_r500 ? 256 : 32;
228 compiler.Base.max_alu_insts = compiler.Base.is_r500 ? 512 : 64;
229 compiler.Base.max_tex_insts = compiler.Base.is_r500 ? 512 : 32;
230 compiler.OutputDepth = FRAG_RESULT_DEPTH;
231 memset(compiler.OutputColor, 0, 4 * sizeof(unsigned));
232 compiler.OutputColor[0] = FRAG_RESULT_COLOR;
233 compiler.AllocateHwInputs = &allocate_hw_inputs;
235 if (compiler.Base.Debug) {
237 printf("Fragment Program: Initial program:\n");
238 _mesa_print_program(&cont->Base.Base);
242 radeon_mesa_to_rc_program(&compiler.Base, &cont->Base.Base);
244 insert_WPOS_trailer(&compiler, fp);
246 rewriteFog(&compiler, fp);
248 r3xx_compile_fragment_program(&compiler);
250 if (compiler.Base.is_r500) {
251 /* We need to support the non-KMS DRM interface, which
252 * artificially limits the number of instructions and
253 * constants which are available to us.
255 * See also the comment in r300_context.c where we
256 * set the MAX_NATIVE_xxx values.
258 if (fp->code.code.r500.inst_end >= 255 || fp->code.constants.Count > 255)
259 rc_error(&compiler.Base, "Program is too big (upgrade to r300g to avoid this limitation).\n");
262 fp->error = compiler.Base.Error;
264 fp->InputsRead = compiler.Base.Program.InputsRead;
266 /* Clear the fog/wpos_attr if code accessing these
267 * attributes has been removed during compilation
269 if (fp->fog_attr != FRAG_ATTRIB_MAX) {
270 if (!(fp->InputsRead & (1 << fp->fog_attr)))
271 fp->fog_attr = FRAG_ATTRIB_MAX;
274 if (fp->wpos_attr != FRAG_ATTRIB_MAX) {
275 if (!(fp->InputsRead & (1 << fp->wpos_attr)))
276 fp->wpos_attr = FRAG_ATTRIB_MAX;
279 rc_destroy(&compiler.Base);
282 struct r300_fragment_program *r300SelectAndTranslateFragmentShader(struct gl_context *ctx)
284 r300ContextPtr r300 = R300_CONTEXT(ctx);
285 struct r300_fragment_program_cont *fp_list;
286 struct r300_fragment_program *fp;
287 struct r300_fragment_program_external_state state;
289 fp_list = (struct r300_fragment_program_cont *)ctx->FragmentProgram._Current;
290 build_state(r300, ctx->FragmentProgram._Current, &state);
294 if (memcmp(&fp->state, &state, sizeof(state)) == 0) {
295 return r300->selected_fp = fp;
300 fp = calloc(1, sizeof(struct r300_fragment_program));
304 fp->next = fp_list->progs;
307 translate_fragment_program(ctx, fp_list, fp);
309 return r300->selected_fp = fp;