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authorBrian Paul <brian.paul@tungstengraphics.com>2006-10-30 00:22:28 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2006-10-30 00:22:28 +0000
commit075fae52001cfd2f99c2c9310208a9a615316454 (patch)
treefdabccb4d357c00e5cdffc0b2496712463249646 /src/mesa/shader
parent0f8405365f199b8d41974ac9cbe945f4dbf2c2bb (diff)
code tweaks, remove old comments
Diffstat (limited to 'src/mesa/shader')
-rw-r--r--src/mesa/shader/nvvertexec.c81
1 files changed, 16 insertions, 65 deletions
diff --git a/src/mesa/shader/nvvertexec.c b/src/mesa/shader/nvvertexec.c
index f00f1e86571..10962d7e14a 100644
--- a/src/mesa/shader/nvvertexec.c
+++ b/src/mesa/shader/nvvertexec.c
@@ -289,18 +289,16 @@ fetch_vector4( GLcontext *ctx,
GLfloat result[4] )
{
const GLfloat *src = get_register_pointer(ctx, source, machine, program);
-
+ ASSERT(src);
+ result[0] = src[GET_SWZ(source->Swizzle, 0)];
+ result[1] = src[GET_SWZ(source->Swizzle, 1)];
+ result[2] = src[GET_SWZ(source->Swizzle, 2)];
+ result[3] = src[GET_SWZ(source->Swizzle, 3)];
if (source->NegateBase) {
- result[0] = -src[GET_SWZ(source->Swizzle, 0)];
- result[1] = -src[GET_SWZ(source->Swizzle, 1)];
- result[2] = -src[GET_SWZ(source->Swizzle, 2)];
- result[3] = -src[GET_SWZ(source->Swizzle, 3)];
- }
- else {
- result[0] = src[GET_SWZ(source->Swizzle, 0)];
- result[1] = src[GET_SWZ(source->Swizzle, 1)];
- result[2] = src[GET_SWZ(source->Swizzle, 2)];
- result[3] = src[GET_SWZ(source->Swizzle, 3)];
+ result[0] = -result[0];
+ result[1] = -result[1];
+ result[2] = -result[2];
+ result[3] = -result[3];
}
}
@@ -317,11 +315,10 @@ fetch_vector1( GLcontext *ctx,
GLfloat result[4] )
{
const GLfloat *src = get_register_pointer(ctx, source, machine, program);
+ ASSERT(src);
+ result[0] = src[GET_SWZ(source->Swizzle, 0)];
if (source->NegateBase) {
- result[0] = -src[GET_SWZ(source->Swizzle, 0)];
- }
- else {
- result[0] = src[GET_SWZ(source->Swizzle, 0)];
+ result[0] = -result[0];
}
}
@@ -337,13 +334,14 @@ store_vector4( const struct prog_instruction *inst,
const struct prog_dst_register *dest = &(inst->DstReg);
GLfloat *dst;
switch (dest->File) {
- case PROGRAM_TEMPORARY:
- dst = machine->Temporaries[dest->Index];
- break;
case PROGRAM_OUTPUT:
dst = machine->Outputs[dest->Index];
break;
+ case PROGRAM_TEMPORARY:
+ dst = machine->Temporaries[dest->Index];
+ break;
case PROGRAM_ENV_PARAM:
+ /* Only for VP state programs */
{
/* a slight hack */
GET_CURRENT_CONTEXT(ctx);
@@ -835,50 +833,3 @@ _mesa_exec_vertex_state_program(GLcontext *ctx,
COPY_4V(machine.Inputs[VERT_ATTRIB_POS], params);
_mesa_exec_vertex_program(ctx, &machine, vprog);
}
-
-
-
-/**
-Thoughts on vertex program optimization:
-
-The obvious thing to do is to compile the vertex program into X86/SSE/3DNow!
-assembly code. That will probably be a lot of work.
-
-Another approach might be to replace the vp_instruction->Opcode field with
-a pointer to a specialized C function which executes the instruction.
-In particular we can write functions which skip swizzling, negating,
-masking, relative addressing, etc. when they're not needed.
-
-For example:
-
-void simple_add( struct prog_instruction *inst )
-{
- GLfloat *sum = machine->Registers[inst->DstReg.Register];
- GLfloat *a = machine->Registers[inst->SrcReg[0].Register];
- GLfloat *b = machine->Registers[inst->SrcReg[1].Register];
- sum[0] = a[0] + b[0];
- sum[1] = a[1] + b[1];
- sum[2] = a[2] + b[2];
- sum[3] = a[3] + b[3];
-}
-
-*/
-
-/*
-
-KW:
-
-A first step would be to 'vectorize' the programs in the same way as
-the normal transformation code in the tnl module. Thus each opcode
-takes zero or more input vectors (registers) and produces one or more
-output vectors.
-
-These operations would intially be coded in C, with machine-specific
-assembly following, as is currently the case for matrix
-transformations in the math/ directory. The preprocessing scheme for
-selecting simpler operations Brian describes above would also work
-here.
-
-This should give reasonable performance without excessive effort.
-
-*/