diff options
Diffstat (limited to 'src/mesa/drivers')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_wm_glsl.c | 46 |
1 files changed, 43 insertions, 3 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_wm_glsl.c b/src/mesa/drivers/dri/i965/brw_wm_glsl.c index c98fd90699..bc82c0100d 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_glsl.c +++ b/src/mesa/drivers/dri/i965/brw_wm_glsl.c @@ -41,6 +41,10 @@ GLboolean brw_wm_is_glsl(const struct gl_fragment_program *fp) return GL_FALSE; } + +/** + * Record the mapping of a Mesa register to a hardware register. + */ static void set_reg(struct brw_wm_compile *c, int file, int index, int component, struct brw_reg reg) { @@ -48,6 +52,10 @@ static void set_reg(struct brw_wm_compile *c, int file, int index, c->wm_regs[file][index][component].inited = GL_TRUE; } +/** + * Examine instruction's write mask to find index of first component + * enabled for writing. + */ static int get_scalar_dst_index(struct prog_instruction *inst) { int i; @@ -67,6 +75,10 @@ static struct brw_reg alloc_tmp(struct brw_wm_compile *c) return reg; } +/** + * Save current temp register info. + * There must be a matching call to release_tmps(). + */ static int mark_tmps(struct brw_wm_compile *c) { return c->tmp_index; @@ -84,6 +96,10 @@ static void release_tmps(struct brw_wm_compile *c, int mark) /** * Convert Mesa src register to brw register. + * + * Since we're running in SOA mode each Mesa register corresponds to four + * hardware registers. We allocate the hardware registers as needed here. + * * \param file register file, one of PROGRAM_x * \param index register number * \param component src component (X=0, Y=1, Z=2, W=3) @@ -108,11 +124,17 @@ get_reg(struct brw_wm_compile *c, int file, int index, int component, break; } - if (c->wm_regs[file][index][component].inited) + /* see if we've already allocated a HW register for this Mesa register */ + if (c->wm_regs[file][index][component].inited) { + /* yes, re-use */ reg = c->wm_regs[file][index][component].reg; - else + } + else { + /* no, allocate new register */ reg = brw_vec8_grf(c->reg_index, 0); + } + /* if this is a new register allocation, record it in the table */ if (!c->wm_regs[file][index][component].inited) { set_reg(c, file, index, component, reg); c->reg_index++; @@ -126,6 +148,12 @@ get_reg(struct brw_wm_compile *c, int file, int index, int component, return reg; } + +/** + * Preallocate registers. This sets up the Mesa to hardware register + * mapping for certain registers, such as constants (uniforms/state vars) + * and shader inputs. + */ static void prealloc_reg(struct brw_wm_compile *c) { int i, j; @@ -139,6 +167,8 @@ static void prealloc_reg(struct brw_wm_compile *c) set_reg(c, PROGRAM_PAYLOAD, PAYLOAD_DEPTH, i, reg); } c->reg_index += 2*c->key.nr_depth_regs; + + /* constants */ { int nr_params = c->fp->program.Base.Parameters->NumParameters; struct gl_program_parameter_list *plist = @@ -157,6 +187,8 @@ static void prealloc_reg(struct brw_wm_compile *c) c->nr_creg = 2*((4*nr_params+15)/16); c->reg_index += c->nr_creg; } + + /* fragment shader inputs */ for (i = 0; i < FRAG_ATTRIB_MAX; i++) { if (inputs & (1<<i)) { nr_interp_regs++; @@ -164,9 +196,9 @@ static void prealloc_reg(struct brw_wm_compile *c) for (j = 0; j < 4; j++) set_reg(c, PROGRAM_PAYLOAD, i, j, reg); c->reg_index += 2; - } } + c->prog_data.first_curbe_grf = c->key.nr_depth_regs * 2; c->prog_data.urb_read_length = nr_interp_regs * 2; c->prog_data.curb_read_length = c->nr_creg; @@ -176,6 +208,10 @@ static void prealloc_reg(struct brw_wm_compile *c) c->reg_index += 2; } + +/** + * Convert Mesa dst register to brw register. + */ static struct brw_reg get_dst_reg(struct brw_wm_compile *c, struct prog_instruction *inst, int component, int nr) { @@ -183,6 +219,10 @@ static struct brw_reg get_dst_reg(struct brw_wm_compile *c, 0, 0); } + +/** + * Convert Mesa src register to brw register. + */ static struct brw_reg get_src_reg(struct brw_wm_compile *c, struct prog_src_register *src, int index, int nr) { |