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mesa: added OPCODE_NRM3/NRM4 instructions for vector normalization.

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We may emit these instructions from GLSL instead of DP3/RCP/MUL.

Also, implement SSG (set sign) instruction in the interpreter.
This commit is contained in:
Brian Paul 2008-11-07 08:51:31 -07:00
parent 4550b0562d
commit f6ead50827
3 changed files with 45 additions and 0 deletions
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41
src/mesa/shader/prog_execute.c
View file

@ -1019,6 +1019,36 @@ _mesa_execute_program(GLcontext * ctx,
break;
case OPCODE_NOP:
break;
case OPCODE_NRM3: /* 3-component normalization */
{
GLfloat a[4], result[4];
GLfloat tmp;
fetch_vector4(&inst->SrcReg[0], machine, a);
tmp = a[0] * a[0] + a[1] * a[1] + a[2] * a[2];
if (tmp != 0.0F)
tmp = 1.0F / tmp;
result[0] = tmp * a[0];
result[1] = tmp * a[1];
result[2] = tmp * a[2];
result[3] = 0.0; /* undefined, but prevent valgrind warnings */
store_vector4(inst, machine, result);
}
break;
case OPCODE_NRM4: /* 4-component normalization */
{
GLfloat a[4], result[4];
GLfloat tmp;
fetch_vector4(&inst->SrcReg[0], machine, a);
tmp = a[0] * a[0] + a[1] * a[1] + a[2] * a[2] + a[3] * a[3];
if (tmp != 0.0F)
tmp = 1.0F / tmp;
result[0] = tmp * a[0];
result[1] = tmp * a[1];
result[2] = tmp * a[2];
result[3] = tmp * a[3];
store_vector4(inst, machine, result);
}
break;
case OPCODE_PK2H: /* pack two 16-bit floats in one 32-bit float */
{
GLfloat a[4], result[4];
@ -1277,6 +1307,17 @@ _mesa_execute_program(GLcontext * ctx,
}
}
break;
case OPCODE_SSG: /* set sign (-1, 0 or +1) */
{
GLfloat a[4], result[4];
fetch_vector4(&inst->SrcReg[0], machine, a);
result[0] = (GLfloat) ((a[0] > 0.0F) - (a[0] < 0.0F));
result[1] = (GLfloat) ((a[1] > 0.0F) - (a[1] < 0.0F));
result[2] = (GLfloat) ((a[2] > 0.0F) - (a[2] < 0.0F));
result[3] = (GLfloat) ((a[3] > 0.0F) - (a[3] < 0.0F));
store_vector4(inst, machine, result);
}
break;
case OPCODE_STR: /* set true, operands ignored */
{
static const GLfloat result[4] = { 1.0F, 1.0F, 1.0F, 1.0F };

2
src/mesa/shader/prog_instruction.c
View file

@ -197,6 +197,8 @@ static const struct instruction_info InstInfo[MAX_OPCODE] = {
{ OPCODE_NOISE2, "NOISE2", 1, 1 },
{ OPCODE_NOISE3, "NOISE3", 1, 1 },
{ OPCODE_NOISE4, "NOISE4", 1, 1 },
{ OPCODE_NRM3, "NRM3", 1, 1 },
{ OPCODE_NRM4, "NRM4", 1, 1 },
{ OPCODE_PK2H, "PK2H", 1, 1 },
{ OPCODE_PK2US, "PK2US", 1, 1 },
{ OPCODE_PK4B, "PK4B", 1, 1 },

2
src/mesa/shader/prog_instruction.h
View file

@ -188,6 +188,8 @@ typedef enum prog_opcode {
OPCODE_NOISE2, /* X */
OPCODE_NOISE3, /* X */
OPCODE_NOISE4, /* X */
OPCODE_NRM3, /* */
OPCODE_NRM4, /* */
OPCODE_PK2H, /* X */
OPCODE_PK2US, /* X */
OPCODE_PK4B, /* X */