/*
* Mesa 3-D graphics library
- * Version: 7.1
*
* Copyright (C) 2005-2008 Brian Paul All Rights Reserved.
+ * Copyright (C) 2008 VMware, Inc. 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"),
struct gl_program **Subroutines;
GLuint NumSubroutines;
+ GLuint MaxInstructions; /**< size of prog->Instructions[] buffer */
+
/* code-gen options */
GLboolean EmitHighLevelInstructions;
GLboolean EmitCondCodes;
}
+/**
+ * Return the default swizzle mask for accessing a variable of the
+ * given size (in floats). If size = 1, comp is used to identify
+ * which component [0..3] of the register holds the variable.
+ */
+GLuint
+_slang_var_swizzle(GLint size, GLint comp)
+{
+ switch (size) {
+ case 1:
+ return MAKE_SWIZZLE4(comp, comp, comp, comp);
+ case 2:
+ return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_NIL, SWIZZLE_NIL);
+ case 3:
+ return MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_NIL);
+ default:
+ return SWIZZLE_XYZW;
+ }
+}
+
+
+
/**
* Allocate storage for the given node (if it hasn't already been allocated).
*
static void
storage_to_dst_reg(struct prog_dst_register *dst, const slang_ir_storage *st)
{
+ const GLboolean relAddr = st->RelAddr;
const GLint size = st->Size;
GLint index = st->Index;
GLuint swizzle = st->Swizzle;
+ assert(index >= 0);
/* if this is storage relative to some parent storage, walk up the tree */
while (st->Parent) {
st = st->Parent;
+ assert(st->Index >= 0);
index += st->Index;
swizzle = _slang_swizzle_swizzle(st->Swizzle, swizzle);
}
}
dst->WriteMask = writemask;
}
+
+ dst->RelAddr = relAddr;
}
GLuint swizzle = st->Swizzle;
/* if this is storage relative to some parent storage, walk up the tree */
+ assert(index >= 0);
while (st->Parent) {
st = st->Parent;
+ if (st->Index < 0) {
+ /* an error should have been reported already */
+ return;
+ }
+ assert(st->Index >= 0);
index += st->Index;
swizzle = _slang_swizzle_swizzle(fix_swizzle(st->Swizzle), swizzle);
}
_mesa_print_instruction(prog->Instructions + prog->NumInstructions - 1);
}
#endif
- prog->Instructions = _mesa_realloc_instructions(prog->Instructions,
- prog->NumInstructions,
- prog->NumInstructions + 1);
+ assert(prog->NumInstructions <= emitInfo->MaxInstructions);
+
+ if (prog->NumInstructions == emitInfo->MaxInstructions) {
+ /* grow the instruction buffer */
+ emitInfo->MaxInstructions += 20;
+ prog->Instructions =
+ _mesa_realloc_instructions(prog->Instructions,
+ prog->NumInstructions,
+ emitInfo->MaxInstructions);
+ }
+
inst = prog->Instructions + prog->NumInstructions;
prog->NumInstructions++;
_mesa_init_instructions(inst, 1);
}
+static struct prog_instruction *
+emit_arl_load(slang_emit_info *emitInfo,
+ enum register_file file, GLint index, GLuint swizzle)
+{
+ struct prog_instruction *inst = new_instruction(emitInfo, OPCODE_ARL);
+ inst->SrcReg[0].File = file;
+ inst->SrcReg[0].Index = index;
+ inst->SrcReg[0].Swizzle = swizzle;
+ inst->DstReg.File = PROGRAM_ADDRESS;
+ inst->DstReg.Index = 0;
+ inst->DstReg.WriteMask = WRITEMASK_X;
+ return inst;
+}
+
+
/**
* Emit a new instruction with given opcode, operands.
+ * At this point the instruction may have multiple indirect register
+ * loads/stores. We convert those into ARL loads and address-relative
+ * operands. See comments inside.
+ * At some point in the future we could directly emit indirectly addressed
+ * registers in Mesa GPU instructions.
*/
static struct prog_instruction *
emit_instruction(slang_emit_info *emitInfo,
gl_inst_opcode opcode,
const slang_ir_storage *dst,
+ const slang_ir_storage *src0,
const slang_ir_storage *src1,
- const slang_ir_storage *src2,
- const slang_ir_storage *src3)
+ const slang_ir_storage *src2)
{
- struct gl_program *prog = emitInfo->prog;
struct prog_instruction *inst;
+ GLuint numIndirect = 0;
+ const slang_ir_storage *src[3];
+ slang_ir_storage newSrc[3], newDst;
+ GLuint i;
+ GLboolean isTemp[3];
+
+ isTemp[0] = isTemp[1] = isTemp[2] = GL_FALSE;
+
+ src[0] = src0;
+ src[1] = src1;
+ src[2] = src2;
+
+ /* count up how many operands are indirect loads */
+ for (i = 0; i < 3; i++) {
+ if (src[i] && src[i]->IsIndirect)
+ numIndirect++;
+ }
+ if (dst && dst->IsIndirect)
+ numIndirect++;
+
+ /* Take special steps for indirect register loads.
+ * If we had multiple address registers this would be simpler.
+ * For example, this GLSL code:
+ * x[i] = y[j] + z[k];
+ * would translate into something like:
+ * ARL ADDR.x, i;
+ * ARL ADDR.y, j;
+ * ARL ADDR.z, k;
+ * ADD TEMP[ADDR.x+5], TEMP[ADDR.y+9], TEMP[ADDR.z+4];
+ * But since we currently only have one address register we have to do this:
+ * ARL ADDR.x, i;
+ * MOV t1, TEMP[ADDR.x+9];
+ * ARL ADDR.x, j;
+ * MOV t2, TEMP[ADDR.x+4];
+ * ARL ADDR.x, k;
+ * ADD TEMP[ADDR.x+5], t1, t2;
+ * The code here figures this out...
+ */
+ if (numIndirect > 0) {
+ for (i = 0; i < 3; i++) {
+ if (src[i] && src[i]->IsIndirect) {
+ /* load the ARL register with the indirect register */
+ emit_arl_load(emitInfo,
+ src[i]->IndirectFile,
+ src[i]->IndirectIndex,
+ src[i]->IndirectSwizzle);
+
+ if (numIndirect > 1) {
+ /* Need to load src[i] into a temporary register */
+ slang_ir_storage srcRelAddr;
+ alloc_local_temp(emitInfo, &newSrc[i], src[i]->Size);
+ isTemp[i] = GL_TRUE;
+
+ /* set RelAddr flag on src register */
+ srcRelAddr = *src[i];
+ srcRelAddr.RelAddr = GL_TRUE;
+ srcRelAddr.IsIndirect = GL_FALSE; /* not really needed */
+
+ /* MOV newSrc, srcRelAddr; */
+ inst = emit_instruction(emitInfo,
+ OPCODE_MOV,
+ &newSrc[i],
+ &srcRelAddr,
+ NULL,
+ NULL);
+
+ src[i] = &newSrc[i];
+ }
+ else {
+ /* just rewrite the src[i] storage to be ARL-relative */
+ newSrc[i] = *src[i];
+ newSrc[i].RelAddr = GL_TRUE;
+ newSrc[i].IsIndirect = GL_FALSE; /* not really needed */
+ src[i] = &newSrc[i];
+ }
+ }
+ }
+ }
- prog->Instructions = _mesa_realloc_instructions(prog->Instructions,
- prog->NumInstructions,
- prog->NumInstructions + 1);
- inst = prog->Instructions + prog->NumInstructions;
- prog->NumInstructions++;
+ /* Take special steps for indirect dest register write */
+ if (dst && dst->IsIndirect) {
+ /* load the ARL register with the indirect register */
+ emit_arl_load(emitInfo,
+ dst->IndirectFile,
+ dst->IndirectIndex,
+ dst->IndirectSwizzle);
+ newDst = *dst;
+ newDst.RelAddr = GL_TRUE;
+ newDst.IsIndirect = GL_FALSE;
+ dst = &newDst;
+ }
- _mesa_init_instructions(inst, 1);
- inst->Opcode = opcode;
- inst->BranchTarget = -1; /* invalid */
+ /* OK, emit the instruction and its dst, src regs */
+ inst = new_instruction(emitInfo, opcode);
+ if (!inst)
+ return NULL;
if (dst)
storage_to_dst_reg(&inst->DstReg, dst);
- if (src1)
- storage_to_src_reg(&inst->SrcReg[0], src1);
- if (src2)
- storage_to_src_reg(&inst->SrcReg[1], src2);
- if (src3)
- storage_to_src_reg(&inst->SrcReg[2], src3);
-
- return inst;
-}
-
+ for (i = 0; i < 3; i++) {
+ if (src[i])
+ storage_to_src_reg(&inst->SrcReg[i], src[i]);
+ }
-/**
- * Emit an ARL instruction.
- */
-static struct prog_instruction *
-emit_arl_instruction(slang_emit_info *emitInfo,
- GLint addrReg,
- const slang_ir_storage *src)
-{
- struct prog_instruction *inst;
+ /* Free any temp registers that we allocated above */
+ for (i = 0; i < 3; i++) {
+ if (isTemp[i])
+ _slang_free_temp(emitInfo->vt, &newSrc[i]);
+ }
- assert(addrReg == 0); /* only one addr reg at this time */
- inst = new_instruction(emitInfo, OPCODE_ARL);
- storage_to_src_reg(&inst->SrcReg[0], src);
- inst->DstReg.File = PROGRAM_ADDRESS;
- inst->DstReg.Index = addrReg;
- inst->DstReg.WriteMask = WRITEMASK_X;
return inst;
}
struct gl_program *progSave;
struct prog_instruction *inst;
GLuint subroutineId;
+ GLuint maxInstSave;
assert(n->Opcode == IR_CALL);
assert(n->Label);
/* save/push cur program */
+ maxInstSave = emitInfo->MaxInstructions;
progSave = emitInfo->prog;
+
emitInfo->prog = new_subroutine(emitInfo, &subroutineId);
+ emitInfo->MaxInstructions = emitInfo->prog->NumInstructions;
_slang_label_set_location(n->Label, emitInfo->prog->NumInstructions,
emitInfo->prog);
/* pop/restore cur program */
emitInfo->prog = progSave;
+ emitInfo->MaxInstructions = maxInstSave;
/* emit the function call */
inst = new_instruction(emitInfo, OPCODE_CAL);
if (inst &&
_slang_is_temp(emitInfo->vt, n->Children[1]->Store) &&
(inst->DstReg.File == n->Children[1]->Store->File) &&
- (inst->DstReg.Index == n->Children[1]->Store->Index)) {
+ (inst->DstReg.Index == n->Children[1]->Store->Index) &&
+ !n->Children[0]->Store->IsIndirect &&
+ n->Children[0]->Store->Size <= 4) {
/* Peephole optimization:
* The Right-Hand-Side has its results in a temporary place.
* Modify the RHS (and the prev instruction) to store its results
inst = emit(emitInfo, n->Children[0]);
- /* setup storage info, if needed */
- if (!n->Store->Parent)
- n->Store->Parent = n->Children[0]->Store;
-
+#if 0
assert(n->Store->Parent);
-
+ /* Apply this node's swizzle to parent's storage */
+ GLuint swizzle = n->Store->Swizzle;
+ _slang_copy_ir_storage(n->Store, n->Store->Parent);
+ n->Store->Swizzle = _slang_swizzle_swizzle(n->Store->Swizzle, swizzle);
+ assert(!n->Store->Parent);
+#endif
return inst;
}
/**
- * Move a block registers from src to dst (or move a single register).
- * \param size size of block, in floats (<=4 means one register)
+ * Dereference array element: element == array[index]
+ * This basically involves emitting code for computing the array index
+ * and updating the node/element's storage info.
*/
static struct prog_instruction *
-move_block(slang_emit_info *emitInfo,
- GLuint size, GLboolean relAddr,
- const slang_ir_storage *dst,
- const slang_ir_storage *src)
+emit_array_element(slang_emit_info *emitInfo, slang_ir_node *n)
{
+ slang_ir_storage *arrayStore, *indexStore;
+ const int elemSize = n->Store->Size; /* number of floats */
+ const GLint elemSizeVec = (elemSize + 3) / 4; /* number of vec4 */
struct prog_instruction *inst;
- if (size > 4) {
- /* move matrix/struct etc (block of registers) */
- slang_ir_storage dstStore = *dst;
- slang_ir_storage srcStore = *src;
-
- dstStore.Size = 4;
- srcStore.Size = 4;
- while (size >= 4) {
- inst = emit_instruction(emitInfo, OPCODE_MOV,
- &dstStore,
- &srcStore,
- NULL,
- NULL);
- inst->SrcReg[0].RelAddr = relAddr;
- inst_comment(inst, "IR_COPY block");
- srcStore.Index++;
- dstStore.Index++;
- size -= 4;
- }
- }
- else {
- /* single register move */
- inst = emit_instruction(emitInfo,
- OPCODE_MOV,
- dst,
- src,
- NULL,
- NULL);
- inst->SrcReg[0].RelAddr = relAddr;
- }
- return inst;
-}
-
-
-
-/**
- * Dereference array element. Just resolve storage for the array
- * element represented by this node.
- * This is typically where Indirect addressing comes into play.
- * See comments on struct slang_ir_storage.
- */
-static struct prog_instruction *
-emit_array_element(slang_emit_info *emitInfo, slang_ir_node *n)
-{
assert(n->Opcode == IR_ELEMENT);
- assert(n->Store);
- assert(n->Store->File == PROGRAM_UNDEFINED);
- assert(n->Store->Parent);
- assert(n->Store->Size > 0);
+ assert(elemSize > 0);
+ /* special case for built-in state variables, like light state */
{
slang_ir_storage *root = n->Store;
+ assert(!root->Parent);
while (root->Parent)
root = root->Parent;
if (root->File == PROGRAM_STATE_VAR) {
- GLint index = _slang_alloc_statevar(n, emitInfo->prog->Parameters);
- assert(n->Store->Index == index);
- return NULL;
+ GLboolean direct;
+ GLint index =
+ _slang_alloc_statevar(n, emitInfo->prog->Parameters, &direct);
+ if (index < 0) {
+ /* error */
+ return NULL;
+ }
+ if (direct) {
+ n->Store->Index = index;
+ return NULL; /* all done */
+ }
}
}
- /* do codegen for array */
+ /* do codegen for array itself */
emit(emitInfo, n->Children[0]);
+ arrayStore = n->Children[0]->Store;
+
+ /* The initial array element storage is the array's storage,
+ * then modified below.
+ */
+ _slang_copy_ir_storage(n->Store, arrayStore);
+
if (n->Children[1]->Opcode == IR_FLOAT) {
- /* Constant array index.
- * Set Store's index to be the offset of the array element in
- * the register file.
- */
+ /* Constant array index */
const GLint element = (GLint) n->Children[1]->Value[0];
- const GLint sz = (n->Store->Size + 3) / 4; /* size in slots/registers */
- n->Store->Index = sz * element;
- assert(n->Store->Parent);
+ /* this element's storage is the array's storage, plus constant offset */
+ n->Store->Index += elemSizeVec * element;
}
else {
/* Variable array index */
- struct prog_instruction *inst;
/* do codegen for array index expression */
emit(emitInfo, n->Children[1]);
+ indexStore = n->Children[1]->Store;
+
+ if (indexStore->IsIndirect) {
+ /* need to put the array index into a temporary since we can't
+ * directly support a[b[i]] constructs.
+ */
+
- /* allocate temp storage for the array element */
- assert(n->Store->Index < 0);
- n->Store->File = PROGRAM_TEMPORARY;
- n->Store->Parent = NULL;
- alloc_node_storage(emitInfo, n, -1);
+ /*indexStore = tempstore();*/
+ }
- if (n->Store->Size > 4) {
- /* need to multiply the index by the element size */
- const GLint elemSize = (n->Store->Size + 3) / 4;
- slang_ir_storage indexTemp, elemSizeStore;
- /* constant containing the element size */
- constant_to_storage(emitInfo, (float) elemSize, &elemSizeStore);
+ if (elemSize > 4) {
+ /* need to multiply array index by array element size */
+ struct prog_instruction *inst;
+ slang_ir_storage *indexTemp;
+ slang_ir_storage elemSizeStore;
/* allocate 1 float indexTemp */
- alloc_local_temp(emitInfo, &indexTemp, 1);
+ indexTemp = _slang_new_ir_storage(PROGRAM_TEMPORARY, -1, 1);
+ _slang_alloc_temp(emitInfo->vt, indexTemp);
- /* MUL temp, index, elemSize */
- inst = emit_instruction(emitInfo, OPCODE_MUL,
- &indexTemp, /* dest */
- n->Children[1]->Store, /* the index */
+ /* allocate a constant containing the element size */
+ constant_to_storage(emitInfo, (float) elemSizeVec, &elemSizeStore);
+
+ /* multiply array index by element size */
+ inst = emit_instruction(emitInfo,
+ OPCODE_MUL,
+ indexTemp, /* dest */
+ indexStore, /* the index */
&elemSizeStore,
NULL);
- /* load ADDR[0].X = temp */
- inst = emit_arl_instruction(emitInfo, 0, &indexTemp);
-
- _slang_free_temp(emitInfo->vt, &indexTemp);
+ indexStore = indexTemp;
}
- else {
- /* simply load address reg w/ array index */
- inst = emit_arl_instruction(emitInfo, 0, n->Children[1]->Store);
+
+ if (arrayStore->IsIndirect) {
+ /* ex: in a[i][j], a[i] (the arrayStore) is indirect */
+ /* Need to add indexStore to arrayStore->Indirect store */
+ slang_ir_storage indirectArray;
+ slang_ir_storage *indexTemp;
+
+ _slang_init_ir_storage(&indirectArray,
+ arrayStore->IndirectFile,
+ arrayStore->IndirectIndex,
+ 1,
+ arrayStore->IndirectSwizzle);
+
+ /* allocate 1 float indexTemp */
+ indexTemp = _slang_new_ir_storage(PROGRAM_TEMPORARY, -1, 1);
+ _slang_alloc_temp(emitInfo->vt, indexTemp);
+
+ inst = emit_instruction(emitInfo,
+ OPCODE_ADD,
+ indexTemp, /* dest */
+ indexStore, /* the index */
+ &indirectArray, /* indirect array base */
+ NULL);
+
+ indexStore = indexTemp;
}
- /* copy from array element to temp storage */
- move_block(emitInfo, n->Store->Size, GL_TRUE,
- n->Store, n->Children[0]->Store);
+ /* update the array element storage info */
+ n->Store->IsIndirect = GL_TRUE;
+ n->Store->IndirectFile = indexStore->File;
+ n->Store->IndirectIndex = indexStore->Index;
+ n->Store->IndirectSwizzle = indexStore->Swizzle;
}
- /* if array element size is one, make sure we only access X */
- if (n->Store->Size == 1)
- n->Store->Swizzle = SWIZZLE_XXXX;
+ n->Store->Size = elemSize;
+ n->Store->Swizzle = _slang_var_swizzle(elemSize, 0);
return NULL; /* no instruction */
}
emit_struct_field(slang_emit_info *emitInfo, slang_ir_node *n)
{
slang_ir_storage *root = n->Store;
+ GLint fieldOffset, fieldSize;
assert(n->Opcode == IR_FIELD);
+ assert(!root->Parent);
while (root->Parent)
root = root->Parent;
* space for the ones that we actually use!
*/
if (root->File == PROGRAM_STATE_VAR) {
- root->Index = _slang_alloc_statevar(n, emitInfo->prog->Parameters);
- if (root->Index < 0) {
+ GLboolean direct;
+ GLint index = _slang_alloc_statevar(n, emitInfo->prog->Parameters, &direct);
+ if (index < 0) {
slang_info_log_error(emitInfo->log, "Error parsing state variable");
return NULL;
}
+ if (direct) {
+ root->Index = index;
+ return NULL; /* all done */
+ }
}
- else {
- /* do codegen for struct */
- emit(emitInfo, n->Children[0]);
+
+ /* do codegen for struct */
+ emit(emitInfo, n->Children[0]);
+ assert(n->Children[0]->Store->Index >= 0);
+
+
+ fieldOffset = n->Store->Index;
+ fieldSize = n->Store->Size;
+
+ _slang_copy_ir_storage(n->Store, n->Children[0]->Store);
+
+ n->Store->Index = n->Children[0]->Store->Index + fieldOffset / 4;
+ n->Store->Size = fieldSize;
+
+ switch (fieldSize) {
+ case 1:
+ {
+ GLint swz = fieldOffset % 4;
+ n->Store->Swizzle = MAKE_SWIZZLE4(swz, swz, swz, swz);
+ }
+ break;
+ case 2:
+ n->Store->Swizzle = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y,
+ SWIZZLE_NIL, SWIZZLE_NIL);
+ break;
+ case 3:
+ n->Store->Swizzle = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y,
+ SWIZZLE_Z, SWIZZLE_NIL);
+ break;
+ default:
+ n->Store->Swizzle = SWIZZLE_XYZW;
}
+ assert(n->Store->Index >= 0);
+
return NULL; /* no instruction */
}
printf("IR_VAR_DECL %s %d store %p\n",
(char*) n->Var->a_name, n->Store->Index, (void*) n->Store);
*/
- assert(n->Var->aux == n->Store);
+ assert(n->Var->store == n->Store);
}
if (emitInfo->EmitComments) {
/* emit NOP with comment describing the variable's storage location */
/**
* Emit code for a reference to a variable.
- * Actually, no code is generated but we may do some memory alloation.
+ * Actually, no code is generated but we may do some memory allocation.
* In particular, state vars (uniforms) are allocated on an as-needed basis.
*/
static struct prog_instruction *
assert(n->Store->File != PROGRAM_UNDEFINED);
if (n->Store->File == PROGRAM_STATE_VAR && n->Store->Index < 0) {
- n->Store->Index = _slang_alloc_statevar(n, emitInfo->prog->Parameters);
+ GLboolean direct;
+ GLint index = _slang_alloc_statevar(n, emitInfo->prog->Parameters, &direct);
+ if (index < 0) {
+ /* error */
+ char s[100];
+ snprintf(s, sizeof(s), "Undefined variable '%s'",
+ (char *) n->Var->a_name);
+ slang_info_log_error(emitInfo->log, s);
+ return NULL;
+ }
+
+ n->Store->Index = index;
}
else if (n->Store->File == PROGRAM_UNIFORM) {
/* mark var as used */
total += emitInfo->Subroutines[i]->NumInstructions;
}
- /* adjust BrancTargets within the functions */
+ /* adjust BranchTargets within the functions */
for (i = 0; i < emitInfo->NumSubroutines; i++) {
struct gl_program *sub = emitInfo->Subroutines[i];
GLuint j;
emitInfo.prog = prog;
emitInfo.Subroutines = NULL;
emitInfo.NumSubroutines = 0;
+ emitInfo.MaxInstructions = prog->NumInstructions;
emitInfo.EmitHighLevelInstructions = ctx->Shader.EmitHighLevelInstructions;
emitInfo.EmitCondCodes = ctx->Shader.EmitCondCodes;
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