diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_wm_glsl.c | 54 |
1 files changed, 37 insertions, 17 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_wm_glsl.c b/src/mesa/drivers/dri/i965/brw_wm_glsl.c index 66c80f1291..0d3e2eb770 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_glsl.c +++ b/src/mesa/drivers/dri/i965/brw_wm_glsl.c @@ -8,12 +8,17 @@ enum _subroutine { SUB_NOISE1, SUB_NOISE2, SUB_NOISE3, SUB_NOISE4 }; -/* Only guess, need a flag in gl_fragment_program later */ + +/** + * Determine if the given fragment program uses GLSL features such + * as flow conditionals, loops, subroutines. + * Some GLSL shaders may use these features, others might not. + */ GLboolean brw_wm_is_glsl(const struct gl_fragment_program *fp) { int i; for (i = 0; i < fp->Base.NumInstructions; i++) { - struct prog_instruction *inst = &fp->Base.Instructions[i]; + const struct prog_instruction *inst = &fp->Base.Instructions[i]; switch (inst->Opcode) { case OPCODE_IF: case OPCODE_TRUNC: @@ -176,13 +181,15 @@ static struct brw_reg get_src_reg(struct brw_wm_compile *c, src->NegateBase, src->Abs); } -/* Subroutines are minimal support for resusable instruction sequences. - They are implemented as simply as possible to minimise overhead: there - is no explicit support for communication between the caller and callee - other than saving the return address in a temporary register, nor is - there any automatic local storage. This implies that great care is - required before attempting reentrancy or any kind of nested - subroutine invocations. */ +/** + * Subroutines are minimal support for resusable instruction sequences. + * They are implemented as simply as possible to minimise overhead: there + * is no explicit support for communication between the caller and callee + * other than saving the return address in a temporary register, nor is + * there any automatic local storage. This implies that great care is + * required before attempting reentrancy or any kind of nested + * subroutine invocations. + */ static void invoke_subroutine( struct brw_wm_compile *c, enum _subroutine subroutine, void (*emit)( struct brw_wm_compile * ) ) @@ -1363,9 +1370,11 @@ static void emit_noise2( struct brw_wm_compile *c, release_tmps( c, mark ); } -/* The three-dimensional case is much like the one- and two- versions above, - but since the number of corners is rapidly growing we now pack 16 16-bit - hashes into each register to extract more parallelism from the EUs. */ +/** + * The three-dimensional case is much like the one- and two- versions above, + * but since the number of corners is rapidly growing we now pack 16 16-bit + * hashes into each register to extract more parallelism from the EUs. + */ static void noise3_sub( struct brw_wm_compile *c ) { struct brw_compile *p = &c->func; @@ -1667,11 +1676,13 @@ static void emit_noise3( struct brw_wm_compile *c, release_tmps( c, mark ); } -/* For the four-dimensional case, the little micro-optimisation benefits - we obtain by unrolling all the loops aren't worth the massive bloat it - now causes. Instead, we loop twice around performing a similar operation - to noise3, once for the w=0 cube and once for the w=1, with a bit more - code to glue it all together. */ +/** + * For the four-dimensional case, the little micro-optimisation benefits + * we obtain by unrolling all the loops aren't worth the massive bloat it + * now causes. Instead, we loop twice around performing a similar operation + * to noise3, once for the w=0 cube and once for the w=1, with a bit more + * code to glue it all together. + */ static void noise4_sub( struct brw_wm_compile *c ) { struct brw_compile *p = &c->func; @@ -2511,10 +2522,19 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c) c->fp->program.Base.Instructions[i].Data = NULL; } + +/** + * Do GPU code generation for shaders that use GLSL features such as + * flow control. Other shaders will be compiled with the + */ void brw_wm_glsl_emit(struct brw_context *brw, struct brw_wm_compile *c) { + /* initial instruction translation/simplification */ brw_wm_pass_fp(c); + + /* actual code generation */ brw_wm_emit_glsl(brw, c); + c->prog_data.total_grf = c->reg_index; c->prog_data.total_scratch = 0; } |