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-rw-r--r--src/mesa/state_tracker/st_atom_shader.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_atom_shader.c b/src/mesa/state_tracker/st_atom_shader.c
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+/**************************************************************************
+ *
+ * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * State validation for vertex/fragment shaders.
+ * Note that we have to delay most vertex/fragment shader translation
+ * until rendering time since the linkage between the vertex outputs and
+ * fragment inputs can vary depending on the pairing of shaders.
+ *
+ * Authors:
+ * Brian Paul
+ */
+
+
+
+#include "main/imports.h"
+#include "main/mtypes.h"
+#include "main/macros.h"
+#include "shader/program.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_shader_tokens.h"
+
+#include "util/u_simple_shaders.h"
+
+#include "cso_cache/cso_context.h"
+
+#include "st_context.h"
+#include "st_atom.h"
+#include "st_program.h"
+#include "st_atom_shader.h"
+#include "st_mesa_to_tgsi.h"
+
+
+/**
+ * This represents a vertex program, especially translated to match
+ * the inputs of a particular fragment shader.
+ */
+struct translated_vertex_program
+{
+ struct st_vertex_program *master;
+
+ /** The fragment shader "signature" this vertex shader is meant for: */
+ GLbitfield frag_inputs;
+
+ /** Compared against master vertex program's serialNo: */
+ GLuint serialNo;
+
+ /** Maps VERT_RESULT_x to slot */
+ GLuint output_to_slot[VERT_RESULT_MAX];
+ ubyte output_to_semantic_name[VERT_RESULT_MAX];
+ ubyte output_to_semantic_index[VERT_RESULT_MAX];
+
+ /** Pointer to the translated vertex program */
+ struct st_vertex_program *vp;
+
+ struct translated_vertex_program *next; /**< next in linked list */
+};
+
+
+
+/**
+ * Given a vertex program output attribute, return the corresponding
+ * fragment program input attribute.
+ * \return -1 for vertex outputs that have no corresponding fragment input
+ */
+static GLint
+vp_out_to_fp_in(GLuint vertResult)
+{
+ if (vertResult >= VERT_RESULT_TEX0 &&
+ vertResult < VERT_RESULT_TEX0 + MAX_TEXTURE_COORD_UNITS)
+ return FRAG_ATTRIB_TEX0 + (vertResult - VERT_RESULT_TEX0);
+
+ if (vertResult >= VERT_RESULT_VAR0 &&
+ vertResult < VERT_RESULT_VAR0 + MAX_VARYING)
+ return FRAG_ATTRIB_VAR0 + (vertResult - VERT_RESULT_VAR0);
+
+ switch (vertResult) {
+ case VERT_RESULT_HPOS:
+ return FRAG_ATTRIB_WPOS;
+ case VERT_RESULT_COL0:
+ return FRAG_ATTRIB_COL0;
+ case VERT_RESULT_COL1:
+ return FRAG_ATTRIB_COL1;
+ case VERT_RESULT_FOGC:
+ return FRAG_ATTRIB_FOGC;
+ default:
+ /* Back-face colors, edge flags, etc */
+ return -1;
+ }
+}
+
+
+/**
+ * Find a translated vertex program that corresponds to stvp and
+ * has outputs matched to stfp's inputs.
+ * This performs vertex and fragment translation (to TGSI) when needed.
+ */
+static struct translated_vertex_program *
+find_translated_vp(struct st_context *st,
+ struct st_vertex_program *stvp,
+ struct st_fragment_program *stfp)
+{
+ static const GLuint UNUSED = ~0;
+ struct translated_vertex_program *xvp;
+ const GLbitfield fragInputsRead = stfp->Base.Base.InputsRead;
+
+ /*
+ * Translate fragment program if needed.
+ */
+ if (!stfp->state.tokens) {
+ GLuint inAttr, numIn = 0;
+
+ for (inAttr = 0; inAttr < FRAG_ATTRIB_MAX; inAttr++) {
+ if (fragInputsRead & (1 << inAttr)) {
+ stfp->input_to_slot[inAttr] = numIn;
+ numIn++;
+ }
+ else {
+ stfp->input_to_slot[inAttr] = UNUSED;
+ }
+ }
+
+ stfp->num_input_slots = numIn;
+
+ assert(stfp->Base.Base.NumInstructions > 1);
+
+ st_translate_fragment_program(st, stfp, stfp->input_to_slot);
+ }
+
+
+ /* See if we've got a translated vertex program whose outputs match
+ * the fragment program's inputs.
+ * XXX This could be a hash lookup, using InputsRead as the key.
+ */
+ for (xvp = stfp->vertex_programs; xvp; xvp = xvp->next) {
+ if (xvp->master == stvp && xvp->frag_inputs == fragInputsRead) {
+ break;
+ }
+ }
+
+ /* No? Allocate translated vp object now */
+ if (!xvp) {
+ xvp = CALLOC_STRUCT(translated_vertex_program);
+ xvp->frag_inputs = fragInputsRead;
+ xvp->master = stvp;
+
+ xvp->next = stfp->vertex_programs;
+ stfp->vertex_programs = xvp;
+ }
+
+ /* See if we need to translate vertex program to TGSI form */
+ if (xvp->serialNo != stvp->serialNo) {
+ GLuint outAttr, dummySlot;
+ const GLbitfield outputsWritten = stvp->Base.Base.OutputsWritten;
+ GLuint numVpOuts = 0;
+ GLboolean emitPntSize = GL_FALSE, emitBFC0 = GL_FALSE, emitBFC1 = GL_FALSE;
+ GLint maxGeneric;
+
+ /* Compute mapping of vertex program outputs to slots, which depends
+ * on the fragment program's input->slot mapping.
+ */
+ for (outAttr = 0; outAttr < VERT_RESULT_MAX; outAttr++) {
+ /* set defaults: */
+ xvp->output_to_slot[outAttr] = UNUSED;
+ xvp->output_to_semantic_name[outAttr] = TGSI_SEMANTIC_COUNT;
+ xvp->output_to_semantic_index[outAttr] = 99;
+
+ if (outAttr == VERT_RESULT_HPOS) {
+ /* always put xformed position into slot zero */
+ xvp->output_to_slot[VERT_RESULT_HPOS] = 0;
+ xvp->output_to_semantic_name[outAttr] = TGSI_SEMANTIC_POSITION;
+ xvp->output_to_semantic_index[outAttr] = 0;
+ numVpOuts++;
+ }
+ else if (outputsWritten & (1 << outAttr)) {
+ /* see if the frag prog wants this vert output */
+ GLint fpInAttrib = vp_out_to_fp_in(outAttr);
+ if (fpInAttrib >= 0) {
+ GLuint fpInSlot = stfp->input_to_slot[fpInAttrib];
+ if (fpInSlot != ~0) {
+ /* match this vp output to the fp input */
+ GLuint vpOutSlot = stfp->input_map[fpInSlot];
+ xvp->output_to_slot[outAttr] = vpOutSlot;
+ xvp->output_to_semantic_name[outAttr] = stfp->input_semantic_name[fpInSlot];
+ xvp->output_to_semantic_index[outAttr] = stfp->input_semantic_index[fpInSlot];
+ numVpOuts++;
+ }
+ }
+ else if (outAttr == VERT_RESULT_PSIZ)
+ emitPntSize = GL_TRUE;
+ else if (outAttr == VERT_RESULT_BFC0)
+ emitBFC0 = GL_TRUE;
+ else if (outAttr == VERT_RESULT_BFC1)
+ emitBFC1 = GL_TRUE;
+ }
+#if 0 /*debug*/
+ printf("assign vp output_to_slot[%d] = %d\n", outAttr,
+ xvp->output_to_slot[outAttr]);
+#endif
+ }
+
+ /* must do these last */
+ if (emitPntSize) {
+ xvp->output_to_slot[VERT_RESULT_PSIZ] = numVpOuts++;
+ xvp->output_to_semantic_name[VERT_RESULT_PSIZ] = TGSI_SEMANTIC_PSIZE;
+ xvp->output_to_semantic_index[VERT_RESULT_PSIZ] = 0;
+ }
+ if (emitBFC0) {
+ xvp->output_to_slot[VERT_RESULT_BFC0] = numVpOuts++;
+ xvp->output_to_semantic_name[VERT_RESULT_BFC0] = TGSI_SEMANTIC_COLOR;
+ xvp->output_to_semantic_index[VERT_RESULT_BFC0] = 0;
+ }
+ if (emitBFC1) {
+ xvp->output_to_slot[VERT_RESULT_BFC1] = numVpOuts++;
+ xvp->output_to_semantic_name[VERT_RESULT_BFC0] = TGSI_SEMANTIC_COLOR;
+ xvp->output_to_semantic_index[VERT_RESULT_BFC0] = 1;
+ }
+
+ /* Unneeded vertex program outputs will go to this slot.
+ * We could use this info to do dead code elimination in the
+ * vertex program.
+ */
+ dummySlot = numVpOuts;
+
+ /* find max GENERIC slot index */
+ maxGeneric = -1;
+ for (outAttr = 0; outAttr < VERT_RESULT_MAX; outAttr++) {
+ if (xvp->output_to_semantic_name[outAttr] == TGSI_SEMANTIC_GENERIC) {
+ maxGeneric = MAX2(maxGeneric,
+ xvp->output_to_semantic_index[outAttr]);
+ }
+ }
+
+ /* Map vert program outputs that aren't used to the dummy slot
+ * (and an unused generic attribute slot).
+ */
+ for (outAttr = 0; outAttr < VERT_RESULT_MAX; outAttr++) {
+ if (outputsWritten & (1 << outAttr)) {
+ if (xvp->output_to_slot[outAttr] == UNUSED) {
+ xvp->output_to_slot[outAttr] = dummySlot;
+ xvp->output_to_semantic_name[outAttr] = TGSI_SEMANTIC_GENERIC;
+ xvp->output_to_semantic_index[outAttr] = maxGeneric + 1;
+ }
+ }
+
+#if 0 /*debug*/
+ printf("vp output_to_slot[%d] = %d\n", outAttr,
+ xvp->output_to_slot[outAttr]);
+#endif
+ }
+
+ assert(stvp->Base.Base.NumInstructions > 1);
+
+ st_translate_vertex_program(st, stvp, xvp->output_to_slot,
+ xvp->output_to_semantic_name,
+ xvp->output_to_semantic_index);
+
+ xvp->vp = stvp;
+
+ /* translated VP is up to date now */
+ xvp->serialNo = stvp->serialNo;
+ }
+
+ return xvp;
+}
+
+
+void
+st_free_translated_vertex_programs(struct st_context *st,
+ struct translated_vertex_program *xvp)
+{
+ struct translated_vertex_program *next;
+
+ while (xvp) {
+ next = xvp->next;
+ free(xvp);
+ xvp = next;
+ }
+}
+
+
+static void *
+get_passthrough_fs(struct st_context *st)
+{
+ struct pipe_shader_state shader;
+
+ if (!st->passthrough_fs) {
+ st->passthrough_fs =
+ util_make_fragment_passthrough_shader(st->pipe, &shader);
+#if 0 /* We actually need to keep the tokens around at this time */
+ free((void *) shader.tokens);
+#endif
+ }
+
+ return st->passthrough_fs;
+}
+
+
+static void
+update_linkage( struct st_context *st )
+{
+ struct st_vertex_program *stvp;
+ struct st_fragment_program *stfp;
+ struct translated_vertex_program *xvp;
+
+ /* find active shader and params -- Should be covered by
+ * ST_NEW_VERTEX_PROGRAM
+ */
+ assert(st->ctx->VertexProgram._Current);
+ stvp = st_vertex_program(st->ctx->VertexProgram._Current);
+ assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
+
+ assert(st->ctx->FragmentProgram._Current);
+ stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
+ assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
+
+ xvp = find_translated_vp(st, stvp, stfp);
+
+ st_reference_vertprog(st, &st->vp, stvp);
+ st_reference_fragprog(st, &st->fp, stfp);
+
+ cso_set_vertex_shader_handle(st->cso_context, stvp->driver_shader);
+
+ if (st->missing_textures) {
+ /* use a pass-through frag shader that uses no textures */
+ void *fs = get_passthrough_fs(st);
+ cso_set_fragment_shader_handle(st->cso_context, fs);
+ }
+ else {
+ cso_set_fragment_shader_handle(st->cso_context, stfp->driver_shader);
+ }
+
+ st->vertex_result_to_slot = xvp->output_to_slot;
+}
+
+
+const struct st_tracked_state st_update_shader = {
+ "st_update_shader", /* name */
+ { /* dirty */
+ 0, /* mesa */
+ ST_NEW_VERTEX_PROGRAM | ST_NEW_FRAGMENT_PROGRAM /* st */
+ },
+ update_linkage /* update */
+};
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