/**************************************************************************
*
* Copyright 2009 VMware, Inc.
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright 2007 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
}
+/**
+ * Fetch the specified lp_jit_viewport structure for a given viewport_index.
+ */
+static LLVMValueRef
+lp_llvm_viewport(LLVMValueRef context_ptr,
+ struct gallivm_state *gallivm,
+ LLVMValueRef viewport_index)
+{
+ LLVMBuilderRef builder = gallivm->builder;
+ LLVMValueRef ptr;
+ LLVMValueRef res;
+ struct lp_type viewport_type =
+ lp_type_float_vec(32, 32 * LP_JIT_VIEWPORT_NUM_FIELDS);
+
+ ptr = lp_jit_context_viewports(gallivm, context_ptr);
+ ptr = LLVMBuildPointerCast(builder, ptr,
+ LLVMPointerType(lp_build_vec_type(gallivm, viewport_type), 0), "");
+
+ res = lp_build_pointer_get(builder, ptr, viewport_index);
+
+ return res;
+}
+
+
/**
* Generate the fragment shader, depth/stencil test, and alpha tests.
*/
const struct tgsi_token *tokens = shader->base.tokens;
LLVMTypeRef vec_type;
LLVMValueRef mask_ptr, mask_val;
- LLVMValueRef consts_ptr;
+ LLVMValueRef consts_ptr, num_consts_ptr;
LLVMValueRef z;
LLVMValueRef z_value, s_value;
LLVMValueRef z_fb, s_fb;
assert(zs_format_desc);
if (!shader->info.base.writes_z) {
- if (key->alpha.enabled || shader->info.base.uses_kill) {
+ if (key->alpha.enabled ||
+ key->blend.alpha_to_coverage ||
+ shader->info.base.uses_kill) {
/* With alpha test and kill, can do the depth test early
* and hopefully eliminate some quads. But need to do a
* special deferred depth write once the final mask value
vec_type = lp_build_vec_type(gallivm, type);
consts_ptr = lp_jit_context_constants(gallivm, context_ptr);
+ num_consts_ptr = lp_jit_context_num_constants(gallivm, context_ptr);
lp_build_for_loop_begin(&loop_state, gallivm,
lp_build_const_int32(gallivm, 0),
/* Build the actual shader */
lp_build_tgsi_soa(gallivm, tokens, type, &mask,
- consts_ptr, &system_values,
+ consts_ptr, num_consts_ptr, &system_values,
interp->inputs,
outputs, sampler, &shader->info.base, NULL);
}
}
+ /* Emulate Alpha to Coverage with Alpha test */
+ if (key->blend.alpha_to_coverage) {
+ int color0 = find_output_by_semantic(&shader->info.base,
+ TGSI_SEMANTIC_COLOR,
+ 0);
+
+ if (color0 != -1 && outputs[color0][3]) {
+ LLVMValueRef alpha = LLVMBuildLoad(builder, outputs[color0][3], "alpha");
+
+ lp_build_alpha_to_coverage(gallivm, type,
+ &mask, alpha,
+ (depth_mode & LATE_DEPTH_TEST) != 0);
+ }
+ }
+
/* Late Z test */
if (depth_mode & LATE_DEPTH_TEST) {
int pos0 = find_output_by_semantic(&shader->info.base,
if (pos0 != -1 && outputs[pos0][2]) {
z = LLVMBuildLoad(builder, outputs[pos0][2], "output.z");
+
+ /*
+ * Clamp according to ARB_depth_clamp semantics.
+ */
+ if (key->depth_clamp) {
+ LLVMValueRef viewport, min_depth, max_depth;
+ LLVMValueRef viewport_index;
+ struct lp_build_context f32_bld;
+
+ assert(type.floating);
+ lp_build_context_init(&f32_bld, gallivm, type);
+
+ /*
+ * Assumes clamping of the viewport index will occur in setup/gs. Value
+ * is passed through the rasterization stage via lp_rast_shader_inputs.
+ *
+ * See: draw_clamp_viewport_idx and lp_clamp_viewport_idx for clamping
+ * semantics.
+ */
+ viewport_index = lp_jit_thread_data_raster_state_viewport_index(gallivm,
+ thread_data_ptr);
+
+ /*
+ * Load the min and max depth from the lp_jit_context.viewports
+ * array of lp_jit_viewport structures.
+ */
+ viewport = lp_llvm_viewport(context_ptr, gallivm, viewport_index);
+
+ /* viewports[viewport_index].min_depth */
+ min_depth = LLVMBuildExtractElement(builder, viewport,
+ lp_build_const_int32(gallivm, LP_JIT_VIEWPORT_MIN_DEPTH),
+ "");
+ min_depth = lp_build_broadcast_scalar(&f32_bld, min_depth);
+
+ /* viewports[viewport_index].max_depth */
+ max_depth = LLVMBuildExtractElement(builder, viewport,
+ lp_build_const_int32(gallivm, LP_JIT_VIEWPORT_MAX_DEPTH),
+ "");
+ max_depth = lp_build_broadcast_scalar(&f32_bld, max_depth);
+
+ /*
+ * Clamp to the min and max depth values for the given viewport.
+ */
+ z = lp_build_clamp(&f32_bld, z, min_depth, max_depth);
+ }
}
lp_build_depth_stencil_load_swizzled(gallivm, type,
}
+/**
+ * Checks if this format requires special handling due to required expansion
+ * to floats for blending, and furthermore has "natural" packed AoS -> unpacked
+ * SoA conversion.
+ */
+static INLINE boolean
+format_expands_to_float_soa(const struct util_format_description *format_desc)
+{
+ if (format_desc->format == PIPE_FORMAT_R11G11B10_FLOAT ||
+ format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
+ return true;
+ }
+ return false;
+}
+
+
/**
* Retrieves the type representing the memory layout for a format
*
unsigned i;
unsigned chan;
- if (format_desc->format == PIPE_FORMAT_R11G11B10_FLOAT) {
+ if (format_expands_to_float_soa(format_desc)) {
/* just make this a 32bit uint */
type->floating = false;
type->fixed = false;
unsigned i;
unsigned chan;
- if (format_desc->format == PIPE_FORMAT_R11G11B10_FLOAT) {
+ if (format_expands_to_float_soa(format_desc)) {
/* always use ordinary floats for blending */
type->floating = true;
type->fixed = false;
/**
- * Scale a normalized value from src_bits to dst_bits
+ * Scale a normalized value from src_bits to dst_bits.
+ *
+ * The exact calculation is
+ *
+ * dst = iround(src * dst_mask / src_mask)
+ *
+ * or with integer rounding
+ *
+ * dst = src * (2*dst_mask + sign(src)*src_mask) / (2*src_mask)
+ *
+ * where
+ *
+ * src_mask = (1 << src_bits) - 1
+ * dst_mask = (1 << dst_bits) - 1
+ *
+ * but we try to avoid division and multiplication through shifts.
*/
static INLINE LLVMValueRef
scale_bits(struct gallivm_state *gallivm,
LLVMValueRef result = src;
if (dst_bits < src_bits) {
- /* Scale down by LShr */
- result = LLVMBuildLShr(builder,
- src,
- lp_build_const_int_vec(gallivm, src_type, src_bits - dst_bits),
- "");
+ int delta_bits = src_bits - dst_bits;
+
+ if (delta_bits <= dst_bits) {
+ /*
+ * Approximate the rescaling with a single shift.
+ *
+ * This gives the wrong rounding.
+ */
+
+ result = LLVMBuildLShr(builder,
+ src,
+ lp_build_const_int_vec(gallivm, src_type, delta_bits),
+ "");
+
+ } else {
+ /*
+ * Try more accurate rescaling.
+ */
+
+ /*
+ * Drop the least significant bits to make space for the multiplication.
+ *
+ * XXX: A better approach would be to use a wider integer type as intermediate. But
+ * this is enough to convert alpha from 16bits -> 2 when rendering to
+ * PIPE_FORMAT_R10G10B10A2_UNORM.
+ */
+ result = LLVMBuildLShr(builder,
+ src,
+ lp_build_const_int_vec(gallivm, src_type, dst_bits),
+ "");
+
+
+ result = LLVMBuildMul(builder,
+ result,
+ lp_build_const_int_vec(gallivm, src_type, (1LL << dst_bits) - 1),
+ "");
+
+ /*
+ * Add a rounding term before the division.
+ *
+ * TODO: Handle signed integers too.
+ */
+ if (!src_type.sign) {
+ result = LLVMBuildAdd(builder,
+ result,
+ lp_build_const_int_vec(gallivm, src_type, (1LL << (delta_bits - 1))),
+ "");
+ }
+
+ /*
+ * Approximate the division by src_mask with a src_bits shift.
+ *
+ * Given the src has already been shifted by dst_bits, all we need
+ * to do is to shift by the difference.
+ */
+
+ result = LLVMBuildLShr(builder,
+ result,
+ lp_build_const_int_vec(gallivm, src_type, delta_bits),
+ "");
+ }
+
} else if (dst_bits > src_bits) {
/* Scale up bits */
int db = dst_bits - src_bits;
return result;
}
+/**
+ * If RT is a smallfloat (needing denorms) format
+ */
+static INLINE int
+have_smallfloat_format(struct lp_type dst_type,
+ enum pipe_format format)
+{
+ return ((dst_type.floating && dst_type.width != 32) ||
+ /* due to format handling hacks this format doesn't have floating set
+ * here (and actually has width set to 32 too) so special case this. */
+ (format == PIPE_FORMAT_R11G11B10_FLOAT));
+}
+
/**
* Convert from memory format to blending format
bool is_arith;
/*
- * full custom path for packed floats - none of the later functions would do
- * anything useful, and given the lp_type representation they can't be fixed.
+ * full custom path for packed floats and srgb formats - none of the later
+ * functions would do anything useful, and given the lp_type representation they
+ * can't be fixed. Should really have some SoA blend path for these kind of
+ * formats rather than hacking them in here.
*/
- if (src_fmt->format == PIPE_FORMAT_R11G11B10_FLOAT) {
+ if (format_expands_to_float_soa(src_fmt)) {
LLVMValueRef tmpsrc[4];
/*
* This is pretty suboptimal for this case blending in SoA would be much
tmps = LLVMBuildShuffleVector(builder, tmps, tmps,
LLVMConstVector(shuffles, 8), "");
}
- lp_build_r11g11b10_to_float(gallivm, tmps, tmpsoa);
+ if (src_fmt->format == PIPE_FORMAT_R11G11B10_FLOAT) {
+ lp_build_r11g11b10_to_float(gallivm, tmps, tmpsoa);
+ }
+ else {
+ lp_build_unpack_rgba_soa(gallivm, src_fmt, dst_type, tmps, tmpsoa);
+ }
lp_build_transpose_aos(gallivm, dst_type, tmpsoa, &src[i * 4]);
}
return;
bool is_arith;
/*
- * full custom path for packed floats - none of the later functions would do
- * anything useful, and given the lp_type representation they can't be fixed.
+ * full custom path for packed floats and srgb formats - none of the later
+ * functions would do anything useful, and given the lp_type representation they
+ * can't be fixed. Should really have some SoA blend path for these kind of
+ * formats rather than hacking them in here.
*/
- if (src_fmt->format == PIPE_FORMAT_R11G11B10_FLOAT) {
+ if (format_expands_to_float_soa(src_fmt)) {
/*
* This is pretty suboptimal for this case blending in SoA would be much
* better - we need to transpose the AoS values back to SoA values for
for (i = 0; i < num_srcs / 4; i++) {
LLVMValueRef tmpsoa[4], tmpdst;
lp_build_transpose_aos(gallivm, src_type, &src[i * 4], tmpsoa);
- tmpdst = lp_build_float_to_r11g11b10(gallivm, tmpsoa);
+ /* really really need SoA here */
+
+ if (src_fmt->format == PIPE_FORMAT_R11G11B10_FLOAT) {
+ tmpdst = lp_build_float_to_r11g11b10(gallivm, tmpsoa);
+ }
+ else {
+ tmpdst = lp_build_float_to_srgb_packed(gallivm, src_fmt,
+ src_type, tmpsoa);
+ }
+
if (src_type.length == 8) {
LLVMValueRef tmpaos, shuffles[8];
unsigned j;
const boolean is_1d = variant->key.resource_1d;
unsigned num_fullblock_fs = is_1d ? 2 * num_fs : num_fs;
+ LLVMValueRef fpstate = 0;
+
+ /* Get type from output format */
+ lp_blend_type_from_format_desc(out_format_desc, &row_type);
+ lp_mem_type_from_format_desc(out_format_desc, &dst_type);
+
+ /*
+ * Technically this code should go into lp_build_smallfloat_to_float
+ * and lp_build_float_to_smallfloat but due to the
+ * http://llvm.org/bugs/show_bug.cgi?id=6393
+ * llvm reorders the mxcsr intrinsics in a way that breaks the code.
+ * So the ordering is important here and there shouldn't be any
+ * llvm ir instrunctions in this function before
+ * this, otherwise half-float format conversions won't work
+ * (again due to llvm bug #6393).
+ */
+ if (have_smallfloat_format(dst_type, out_format)) {
+ /* We need to make sure that denorms are ok for half float
+ conversions */
+ fpstate = lp_build_fpstate_get(gallivm);
+ lp_build_fpstate_set_denorms_zero(gallivm, FALSE);
+ }
mask_type = lp_int32_vec4_type();
mask_type.length = fs_type.length;
undef_src_val = lp_build_undef(gallivm, fs_type);
#endif
-
- /* Get type from output format */
- lp_blend_type_from_format_desc(out_format_desc, &row_type);
- lp_mem_type_from_format_desc(out_format_desc, &dst_type);
-
row_type.length = fs_type.length;
vector_width = dst_type.floating ? lp_native_vector_width : lp_integer_vector_width;
}
}
- if (out_format == PIPE_FORMAT_R11G11B10_FLOAT) {
- /* the code above can't work for layout_other */
+ if (format_expands_to_float_soa(out_format_desc)) {
+ /*
+ * the code above can't work for layout_other
+ * for srgb it would sort of work but we short-circuit swizzles, etc.
+ * as that is done as part of unpack / pack.
+ */
dst_channels = 4; /* HACK: this is fake 4 really but need it due to transpose stuff later */
has_alpha = true;
swizzle[0] = 0;
/* Convert */
lp_build_conv(gallivm, fs_type, blend_type, &blend_color, 1, &blend_color, 1);
+ if (out_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
+ /*
+ * since blending is done with floats, there was no conversion.
+ * However, the rules according to fixed point renderbuffers still
+ * apply, that is we must clamp inputs to 0.0/1.0.
+ * (This would apply to separate alpha conversion too but we currently
+ * force has_alpha to be true.)
+ * TODO: should skip this with "fake" blend, since post-blend conversion
+ * will clamp anyway.
+ * TODO: could also skip this if fragment color clamping is enabled. We
+ * don't support it natively so it gets baked into the shader however, so
+ * can't really tell here.
+ */
+ struct lp_build_context f32_bld;
+ assert(row_type.floating);
+ lp_build_context_init(&f32_bld, gallivm, row_type);
+ for (i = 0; i < src_count; i++) {
+ src[i] = lp_build_clamp_zero_one_nanzero(&f32_bld, src[i]);
+ }
+ if (dual_source_blend) {
+ for (i = 0; i < src_count; i++) {
+ src1[i] = lp_build_clamp_zero_one_nanzero(&f32_bld, src1[i]);
+ }
+ }
+ /* probably can't be different than row_type but better safe than sorry... */
+ lp_build_context_init(&f32_bld, gallivm, blend_type);
+ blend_color = lp_build_clamp(&f32_bld, blend_color, f32_bld.zero, f32_bld.one);
+ }
+
/* Extract alpha */
blend_alpha = lp_build_extract_broadcast(gallivm, blend_type, row_type, blend_color, lp_build_const_int32(gallivm, 3));
dst_type.length *= block_size / dst_count;
- if (out_format == PIPE_FORMAT_R11G11B10_FLOAT) {
+ if (format_expands_to_float_soa(out_format_desc)) {
/*
* we need multiple values at once for the conversion, so can as well
* load them vectorized here too instead of concatenating later.
*/
convert_to_blend_type(gallivm, block_size, out_format_desc, dst_type, row_type, dst, src_count);
+ /*
+ * FIXME: Really should get logic ops / masks out of generic blend / row
+ * format. Logic ops will definitely not work on the blend float format
+ * used for SRGB here and I think OpenGL expects this to work as expected
+ * (that is incoming values converted to srgb then logic op applied).
+ */
for (i = 0; i < src_count; ++i) {
dst[i] = lp_build_blend_aos(gallivm,
&variant->key.blend,
dst, dst_type, dst_count, dst_alignment);
}
+ if (have_smallfloat_format(dst_type, out_format)) {
+ lp_build_fpstate_set(gallivm, fpstate);
+ }
+
if (do_branch) {
lp_build_mask_end(&mask_ctx);
}
/* Loop over color outputs / color buffers to do blending.
*/
for(cbuf = 0; cbuf < key->nr_cbufs; cbuf++) {
- LLVMValueRef color_ptr;
- LLVMValueRef stride;
- LLVMValueRef index = lp_build_const_int32(gallivm, cbuf);
+ if (key->cbuf_format[cbuf] != PIPE_FORMAT_NONE) {
+ LLVMValueRef color_ptr;
+ LLVMValueRef stride;
+ LLVMValueRef index = lp_build_const_int32(gallivm, cbuf);
- boolean do_branch = ((key->depth.enabled
- || key->stencil[0].enabled
- || key->alpha.enabled)
- && !shader->info.base.uses_kill);
+ boolean do_branch = ((key->depth.enabled
+ || key->stencil[0].enabled
+ || key->alpha.enabled)
+ && !shader->info.base.uses_kill);
- color_ptr = LLVMBuildLoad(builder,
- LLVMBuildGEP(builder, color_ptr_ptr, &index, 1, ""),
- "");
+ color_ptr = LLVMBuildLoad(builder,
+ LLVMBuildGEP(builder, color_ptr_ptr,
+ &index, 1, ""),
+ "");
- lp_build_name(color_ptr, "color_ptr%d", cbuf);
+ lp_build_name(color_ptr, "color_ptr%d", cbuf);
- stride = LLVMBuildLoad(builder,
- LLVMBuildGEP(builder, stride_ptr, &index, 1, ""),
- "");
+ stride = LLVMBuildLoad(builder,
+ LLVMBuildGEP(builder, stride_ptr, &index, 1, ""),
+ "");
- generate_unswizzled_blend(gallivm, cbuf, variant, key->cbuf_format[cbuf],
- num_fs, fs_type, fs_mask, fs_out_color,
- context_ptr, color_ptr, stride, partial_mask, do_branch);
+ generate_unswizzled_blend(gallivm, cbuf, variant,
+ key->cbuf_format[cbuf],
+ num_fs, fs_type, fs_mask, fs_out_color,
+ context_ptr, color_ptr, stride,
+ partial_mask, do_branch);
+ }
}
LLVMBuildRetVoid(builder);
debug_printf("blend.alpha_dst_factor = %s\n", util_dump_blend_factor(key->blend.rt[0].alpha_dst_factor, TRUE));
}
debug_printf("blend.colormask = 0x%x\n", key->blend.rt[0].colormask);
+ if (key->blend.alpha_to_coverage) {
+ debug_printf("blend.alpha_to_coverage is enabled\n");
+ }
for (i = 0; i < key->nr_samplers; ++i) {
const struct lp_static_sampler_state *sampler = &key->state[i].sampler_state;
debug_printf("sampler[%u] = \n", i);
fullcolormask &&
!key->stencil[0].enabled &&
!key->alpha.enabled &&
+ !key->blend.alpha_to_coverage &&
!key->depth.enabled &&
!shader->info.base.uses_kill
- ? TRUE : FALSE;
+ ? TRUE : FALSE;
+
+ if ((shader->info.base.num_tokens <= 1) &&
+ !key->depth.enabled && !key->stencil[0].enabled) {
+ variant->ps_inv_multiplier = 0;
+ } else {
+ variant->ps_inv_multiplier = 1;
+ }
if ((LP_DEBUG & DEBUG_FS) || (gallivm_debug & GALLIVM_DEBUG_IR)) {
lp_debug_fs_variant(variant);
* Return the blend factor equivalent to a destination alpha of one.
*/
static INLINE unsigned
-force_dst_alpha_one(unsigned factor)
+force_dst_alpha_one(unsigned factor, boolean clamped_zero)
{
switch(factor) {
case PIPE_BLENDFACTOR_DST_ALPHA:
case PIPE_BLENDFACTOR_INV_DST_ALPHA:
return PIPE_BLENDFACTOR_ZERO;
case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
- return PIPE_BLENDFACTOR_ZERO;
+ if (clamped_zero)
+ return PIPE_BLENDFACTOR_ZERO;
+ else
+ return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE;
}
return factor;
}
}
+ /*
+ * Propagate the depth clamp setting from the rasterizer state.
+ * depth_clip == 0 implies depth clamping is enabled.
+ *
+ * When clip_halfz is enabled, then always clamp the depth values.
+ */
+ if (lp->rasterizer->clip_halfz) {
+ key->depth_clamp = 1;
+ } else {
+ key->depth_clamp = (lp->rasterizer->depth_clip == 0) ? 1 : 0;
+ }
+
/* alpha test only applies if render buffer 0 is non-integer (or does not exist) */
if (!lp->framebuffer.nr_cbufs ||
+ !lp->framebuffer.cbufs[0] ||
!util_format_is_pure_integer(lp->framebuffer.cbufs[0]->format)) {
key->alpha.enabled = lp->depth_stencil->alpha.enabled;
}
}
for (i = 0; i < lp->framebuffer.nr_cbufs; i++) {
- enum pipe_format format = lp->framebuffer.cbufs[i]->format;
struct pipe_rt_blend_state *blend_rt = &key->blend.rt[i];
- const struct util_format_description *format_desc;
- key->cbuf_format[i] = format;
+ if (lp->framebuffer.cbufs[i]) {
+ enum pipe_format format = lp->framebuffer.cbufs[i]->format;
+ const struct util_format_description *format_desc;
- /*
- * Figure out if this is a 1d resource. Note that OpenGL allows crazy
- * mixing of 2d textures with height 1 and 1d textures, so make sure
- * we pick 1d if any cbuf or zsbuf is 1d.
- */
- if (llvmpipe_resource_is_1d(lp->framebuffer.cbufs[0]->texture)) {
- key->resource_1d = TRUE;
- }
+ key->cbuf_format[i] = format;
- format_desc = util_format_description(format);
- assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
- format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB);
+ /*
+ * Figure out if this is a 1d resource. Note that OpenGL allows crazy
+ * mixing of 2d textures with height 1 and 1d textures, so make sure
+ * we pick 1d if any cbuf or zsbuf is 1d.
+ */
+ if (llvmpipe_resource_is_1d(lp->framebuffer.cbufs[i]->texture)) {
+ key->resource_1d = TRUE;
+ }
- /*
- * Mask out color channels not present in the color buffer.
- */
- blend_rt->colormask &= util_format_colormask(format_desc);
+ format_desc = util_format_description(format);
+ assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
+ format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB);
- /*
- * Disable blend for integer formats.
- */
- if (util_format_is_pure_integer(format)) {
- blend_rt->blend_enable = 0;
- }
+ /*
+ * Mask out color channels not present in the color buffer.
+ */
+ blend_rt->colormask &= util_format_colormask(format_desc);
- /*
- * Our swizzled render tiles always have an alpha channel, but the linear
- * render target format often does not, so force here the dst alpha to be
- * one.
- *
- * This is not a mere optimization. Wrong results will be produced if the
- * dst alpha is used, the dst format does not have alpha, and the previous
- * rendering was not flushed from the swizzled to linear buffer. For
- * example, NonPowTwo DCT.
- *
- * TODO: This should be generalized to all channels for better
- * performance, but only alpha causes correctness issues.
- *
- * Also, force rgb/alpha func/factors match, to make AoS blending easier.
- */
- if (format_desc->swizzle[3] > UTIL_FORMAT_SWIZZLE_W ||
- format_desc->swizzle[3] == format_desc->swizzle[0]) {
- blend_rt->rgb_src_factor = force_dst_alpha_one(blend_rt->rgb_src_factor);
- blend_rt->rgb_dst_factor = force_dst_alpha_one(blend_rt->rgb_dst_factor);
- blend_rt->alpha_func = blend_rt->rgb_func;
- blend_rt->alpha_src_factor = blend_rt->rgb_src_factor;
- blend_rt->alpha_dst_factor = blend_rt->rgb_dst_factor;
+ /*
+ * Disable blend for integer formats.
+ */
+ if (util_format_is_pure_integer(format)) {
+ blend_rt->blend_enable = 0;
+ }
+
+ /*
+ * Our swizzled render tiles always have an alpha channel, but the
+ * linear render target format often does not, so force here the dst
+ * alpha to be one.
+ *
+ * This is not a mere optimization. Wrong results will be produced if
+ * the dst alpha is used, the dst format does not have alpha, and the
+ * previous rendering was not flushed from the swizzled to linear
+ * buffer. For example, NonPowTwo DCT.
+ *
+ * TODO: This should be generalized to all channels for better
+ * performance, but only alpha causes correctness issues.
+ *
+ * Also, force rgb/alpha func/factors match, to make AoS blending
+ * easier.
+ */
+ if (format_desc->swizzle[3] > UTIL_FORMAT_SWIZZLE_W ||
+ format_desc->swizzle[3] == format_desc->swizzle[0]) {
+ /* Doesn't cover mixed snorm/unorm but can't render to them anyway */
+ boolean clamped_zero = !util_format_is_float(format) &&
+ !util_format_is_snorm(format);
+ blend_rt->rgb_src_factor =
+ force_dst_alpha_one(blend_rt->rgb_src_factor, clamped_zero);
+ blend_rt->rgb_dst_factor =
+ force_dst_alpha_one(blend_rt->rgb_dst_factor, clamped_zero);
+ blend_rt->alpha_func = blend_rt->rgb_func;
+ blend_rt->alpha_src_factor = blend_rt->rgb_src_factor;
+ blend_rt->alpha_dst_factor = blend_rt->rgb_dst_factor;
+ }
+ }
+ else {
+ /* no color buffer for this fragment output */
+ key->cbuf_format[i] = PIPE_FORMAT_NONE;
+ blend_rt->colormask = 0x0;
+ blend_rt->blend_enable = 0;
}
}
llvmpipe->pipe.set_constant_buffer = llvmpipe_set_constant_buffer;
}
+
+/*
+ * Rasterization is disabled if there is no pixel shader and
+ * both depth and stencil testing are disabled:
+ * http://msdn.microsoft.com/en-us/library/windows/desktop/bb205125
+ */
+boolean
+llvmpipe_rasterization_disabled(struct llvmpipe_context *lp)
+{
+ boolean null_fs = !lp->fs || lp->fs->info.base.num_tokens <= 1;
+
+ return (null_fs &&
+ !lp->depth_stencil->depth.enabled &&
+ !lp->depth_stencil->stencil[0].enabled);
+}
projects / mesa.git / blobdiff