diff options
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_state_fs.c')
| -rw-r--r-- | src/gallium/drivers/llvmpipe/lp_state_fs.c | 762 |
1 files changed, 762 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c new file mode 100644 index 0000000000..618cf1ffb8 --- /dev/null +++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c @@ -0,0 +1,762 @@ +/************************************************************************** + * + * Copyright 2009 VMware, Inc. + * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * 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 + * 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. + * + **************************************************************************/ + +/** + * @file + * Code generate the whole fragment pipeline. + * + * The fragment pipeline consists of the following stages: + * - stipple (TBI) + * - early depth test + * - fragment shader + * - alpha test + * - depth/stencil test (stencil TBI) + * - blending + * + * This file has only the glue to assembly the fragment pipeline. The actual + * plumbing of converting Gallium state into LLVM IR is done elsewhere, in the + * lp_bld_*.[ch] files, and in a complete generic and reusable way. Here we + * muster the LLVM JIT execution engine to create a function that follows an + * established binary interface and that can be called from C directly. + * + * A big source of complexity here is that we often want to run different + * stages with different precisions and data types and precisions. For example, + * the fragment shader needs typically to be done in floats, but the + * depth/stencil test and blending is better done in the type that most closely + * matches the depth/stencil and color buffer respectively. + * + * Since the width of a SIMD vector register stays the same regardless of the + * element type, different types imply different number of elements, so we must + * code generate more instances of the stages with larger types to be able to + * feed/consume the stages with smaller types. + * + * @author Jose Fonseca <jfonseca@vmware.com> + */ + +#include "pipe/p_defines.h" +#include "util/u_memory.h" +#include "util/u_format.h" +#include "util/u_debug_dump.h" +#include "pipe/internal/p_winsys_screen.h" +#include "pipe/p_shader_tokens.h" +#include "draw/draw_context.h" +#include "tgsi/tgsi_dump.h" +#include "tgsi/tgsi_scan.h" +#include "tgsi/tgsi_parse.h" +#include "lp_bld_type.h" +#include "lp_bld_const.h" +#include "lp_bld_conv.h" +#include "lp_bld_intr.h" +#include "lp_bld_logic.h" +#include "lp_bld_depth.h" +#include "lp_bld_interp.h" +#include "lp_bld_tgsi.h" +#include "lp_bld_alpha.h" +#include "lp_bld_blend.h" +#include "lp_bld_swizzle.h" +#include "lp_bld_flow.h" +#include "lp_bld_debug.h" +#include "lp_screen.h" +#include "lp_context.h" +#include "lp_state.h" +#include "lp_quad.h" +#include "lp_tex_sample.h" + + +static const unsigned char quad_offset_x[4] = {0, 1, 0, 1}; +static const unsigned char quad_offset_y[4] = {0, 0, 1, 1}; + + +/* + * Derive from the quad's upper left scalar coordinates the coordinates for + * all other quad pixels + */ +static void +generate_pos0(LLVMBuilderRef builder, + LLVMValueRef x, + LLVMValueRef y, + LLVMValueRef *x0, + LLVMValueRef *y0) +{ + LLVMTypeRef int_elem_type = LLVMInt32Type(); + LLVMTypeRef int_vec_type = LLVMVectorType(int_elem_type, QUAD_SIZE); + LLVMTypeRef elem_type = LLVMFloatType(); + LLVMTypeRef vec_type = LLVMVectorType(elem_type, QUAD_SIZE); + LLVMValueRef x_offsets[QUAD_SIZE]; + LLVMValueRef y_offsets[QUAD_SIZE]; + unsigned i; + + x = lp_build_broadcast(builder, int_vec_type, x); + y = lp_build_broadcast(builder, int_vec_type, y); + + for(i = 0; i < QUAD_SIZE; ++i) { + x_offsets[i] = LLVMConstInt(int_elem_type, quad_offset_x[i], 0); + y_offsets[i] = LLVMConstInt(int_elem_type, quad_offset_y[i], 0); + } + + x = LLVMBuildAdd(builder, x, LLVMConstVector(x_offsets, QUAD_SIZE), ""); + y = LLVMBuildAdd(builder, y, LLVMConstVector(y_offsets, QUAD_SIZE), ""); + + *x0 = LLVMBuildSIToFP(builder, x, vec_type, ""); + *y0 = LLVMBuildSIToFP(builder, y, vec_type, ""); +} + + +/** + * Generate the depth test. + */ +static void +generate_depth(LLVMBuilderRef builder, + const struct lp_fragment_shader_variant_key *key, + union lp_type src_type, + struct lp_build_mask_context *mask, + LLVMValueRef src, + LLVMValueRef dst_ptr) +{ + const struct util_format_description *format_desc; + union lp_type dst_type; + + if(!key->depth.enabled) + return; + + format_desc = util_format_description(key->zsbuf_format); + assert(format_desc); + + /* Pick the depth type. */ + dst_type = lp_depth_type(format_desc, src_type.width*src_type.length); + + /* FIXME: Cope with a depth test type with a different bit width. */ + assert(dst_type.width == src_type.width); + assert(dst_type.length == src_type.length); + +#if 1 + src = lp_build_clamped_float_to_unsigned_norm(builder, + src_type, + dst_type.width, + src); +#else + lp_build_conv(builder, src_type, dst_type, &src, 1, &src, 1); +#endif + + lp_build_depth_test(builder, + &key->depth, + dst_type, + format_desc, + mask, + src, + dst_ptr); +} + + +/** + * Generate the fragment shader, depth/stencil test, and alpha tests. + */ +static void +generate_fs(struct llvmpipe_context *lp, + struct lp_fragment_shader *shader, + const struct lp_fragment_shader_variant_key *key, + LLVMBuilderRef builder, + union lp_type type, + LLVMValueRef context_ptr, + unsigned i, + const struct lp_build_interp_soa_context *interp, + struct lp_build_sampler_soa *sampler, + LLVMValueRef *pmask, + LLVMValueRef *color, + LLVMValueRef depth_ptr) +{ + const struct tgsi_token *tokens = shader->base.tokens; + LLVMTypeRef elem_type; + LLVMTypeRef vec_type; + LLVMTypeRef int_vec_type; + LLVMValueRef consts_ptr; + LLVMValueRef outputs[PIPE_MAX_SHADER_OUTPUTS][NUM_CHANNELS]; + LLVMValueRef z = interp->pos[2]; + struct lp_build_flow_context *flow; + struct lp_build_mask_context mask; + boolean early_depth_test; + unsigned attrib; + unsigned chan; + + elem_type = lp_build_elem_type(type); + vec_type = lp_build_vec_type(type); + int_vec_type = lp_build_int_vec_type(type); + + consts_ptr = lp_jit_context_constants(builder, context_ptr); + + flow = lp_build_flow_create(builder); + + memset(outputs, 0, sizeof outputs); + + lp_build_flow_scope_begin(flow); + + /* Declare the color and z variables */ + for(chan = 0; chan < NUM_CHANNELS; ++chan) { + color[chan] = LLVMGetUndef(vec_type); + lp_build_flow_scope_declare(flow, &color[chan]); + } + lp_build_flow_scope_declare(flow, &z); + + lp_build_mask_begin(&mask, flow, type, *pmask); + + early_depth_test = + key->depth.enabled && + !key->alpha.enabled && + !shader->info.uses_kill && + !shader->info.writes_z; + + if(early_depth_test) + generate_depth(builder, key, + type, &mask, + z, depth_ptr); + + lp_build_tgsi_soa(builder, tokens, type, &mask, + consts_ptr, interp->pos, interp->inputs, + outputs, sampler); + + for (attrib = 0; attrib < shader->info.num_outputs; ++attrib) { + for(chan = 0; chan < NUM_CHANNELS; ++chan) { + if(outputs[attrib][chan]) { + lp_build_name(outputs[attrib][chan], "output%u.%u.%c", i, attrib, "xyzw"[chan]); + + switch (shader->info.output_semantic_name[attrib]) { + case TGSI_SEMANTIC_COLOR: + { + unsigned cbuf = shader->info.output_semantic_index[attrib]; + + lp_build_name(outputs[attrib][chan], "color%u.%u.%c", i, attrib, "rgba"[chan]); + + /* Alpha test */ + /* XXX: should the alpha reference value be passed separately? */ + if(cbuf == 0 && chan == 3) { + LLVMValueRef alpha = outputs[attrib][chan]; + LLVMValueRef alpha_ref_value; + alpha_ref_value = lp_jit_context_alpha_ref_value(builder, context_ptr); + alpha_ref_value = lp_build_broadcast(builder, vec_type, alpha_ref_value); + lp_build_alpha_test(builder, &key->alpha, type, + &mask, alpha, alpha_ref_value); + } + + if(cbuf == 0) + color[chan] = outputs[attrib][chan]; + + break; + } + + case TGSI_SEMANTIC_POSITION: + if(chan == 2) + z = outputs[attrib][chan]; + break; + } + } + } + } + + if(!early_depth_test) + generate_depth(builder, key, + type, &mask, + z, depth_ptr); + + lp_build_mask_end(&mask); + + lp_build_flow_scope_end(flow); + + lp_build_flow_destroy(flow); + + *pmask = mask.value; + +} + + +/** + * Generate color blending and color output. + */ +static void +generate_blend(const struct pipe_blend_state *blend, + LLVMBuilderRef builder, + union lp_type type, + LLVMValueRef context_ptr, + LLVMValueRef mask, + LLVMValueRef *src, + LLVMValueRef dst_ptr) +{ + struct lp_build_context bld; + struct lp_build_flow_context *flow; + struct lp_build_mask_context mask_ctx; + LLVMTypeRef vec_type; + LLVMTypeRef int_vec_type; + LLVMValueRef const_ptr; + LLVMValueRef con[4]; + LLVMValueRef dst[4]; + LLVMValueRef res[4]; + unsigned chan; + + lp_build_context_init(&bld, builder, type); + + flow = lp_build_flow_create(builder); + lp_build_mask_begin(&mask_ctx, flow, type, mask); + + vec_type = lp_build_vec_type(type); + int_vec_type = lp_build_int_vec_type(type); + + const_ptr = lp_jit_context_blend_color(builder, context_ptr); + const_ptr = LLVMBuildBitCast(builder, const_ptr, + LLVMPointerType(vec_type, 0), ""); + + for(chan = 0; chan < 4; ++chan) { + LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0); + con[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, const_ptr, &index, 1, ""), ""); + + dst[chan] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, dst_ptr, &index, 1, ""), ""); + + lp_build_name(con[chan], "con.%c", "rgba"[chan]); + lp_build_name(dst[chan], "dst.%c", "rgba"[chan]); + } + + lp_build_blend_soa(builder, blend, type, src, dst, con, res); + + for(chan = 0; chan < 4; ++chan) { + if(blend->colormask & (1 << chan)) { + LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), chan, 0); + lp_build_name(res[chan], "res.%c", "rgba"[chan]); + res[chan] = lp_build_select(&bld, mask, res[chan], dst[chan]); + LLVMBuildStore(builder, res[chan], LLVMBuildGEP(builder, dst_ptr, &index, 1, "")); + } + } + + lp_build_mask_end(&mask_ctx); + lp_build_flow_destroy(flow); +} + + +/** + * Generate the runtime callable function for the whole fragment pipeline. + */ +static struct lp_fragment_shader_variant * +generate_fragment(struct llvmpipe_context *lp, + struct lp_fragment_shader *shader, + const struct lp_fragment_shader_variant_key *key) +{ + struct llvmpipe_screen *screen = llvmpipe_screen(lp->pipe.screen); + struct lp_fragment_shader_variant *variant; + union lp_type fs_type; + union lp_type blend_type; + LLVMTypeRef fs_elem_type; + LLVMTypeRef fs_vec_type; + LLVMTypeRef fs_int_vec_type; + LLVMTypeRef blend_vec_type; + LLVMTypeRef blend_int_vec_type; + LLVMTypeRef arg_types[9]; + LLVMTypeRef func_type; + LLVMValueRef context_ptr; + LLVMValueRef x; + LLVMValueRef y; + LLVMValueRef a0_ptr; + LLVMValueRef dadx_ptr; + LLVMValueRef dady_ptr; + LLVMValueRef mask_ptr; + LLVMValueRef color_ptr; + LLVMValueRef depth_ptr; + LLVMBasicBlockRef block; + LLVMBuilderRef builder; + LLVMValueRef x0; + LLVMValueRef y0; + struct lp_build_sampler_soa *sampler; + struct lp_build_interp_soa_context interp; + LLVMValueRef fs_mask[LP_MAX_VECTOR_LENGTH]; + LLVMValueRef fs_out_color[NUM_CHANNELS][LP_MAX_VECTOR_LENGTH]; + LLVMValueRef blend_mask; + LLVMValueRef blend_in_color[NUM_CHANNELS]; + unsigned num_fs; + unsigned i; + unsigned chan; + +#ifdef DEBUG + tgsi_dump(shader->base.tokens, 0); + if(key->depth.enabled) { + debug_printf("depth.func = %s\n", debug_dump_func(key->depth.func, TRUE)); + debug_printf("depth.writemask = %u\n", key->depth.writemask); + debug_printf("depth.occlusion_count = %u\n", key->depth.occlusion_count); + } + if(key->alpha.enabled) { + debug_printf("alpha.func = %s\n", debug_dump_func(key->alpha.func, TRUE)); + debug_printf("alpha.ref_value = %f\n", key->alpha.ref_value); + } + if(key->blend.logicop_enable) { + debug_printf("blend.logicop_func = %u\n", key->blend.logicop_func); + } + else if(key->blend.blend_enable) { + debug_printf("blend.rgb_func = %s\n", debug_dump_blend_func (key->blend.rgb_func, TRUE)); + debug_printf("rgb_src_factor = %s\n", debug_dump_blend_factor(key->blend.rgb_src_factor, TRUE)); + debug_printf("rgb_dst_factor = %s\n", debug_dump_blend_factor(key->blend.rgb_dst_factor, TRUE)); + debug_printf("alpha_func = %s\n", debug_dump_blend_func (key->blend.alpha_func, TRUE)); + debug_printf("alpha_src_factor = %s\n", debug_dump_blend_factor(key->blend.alpha_src_factor, TRUE)); + debug_printf("alpha_dst_factor = %s\n", debug_dump_blend_factor(key->blend.alpha_dst_factor, TRUE)); + } + debug_printf("blend.colormask = 0x%x\n", key->blend.colormask); +#endif + + variant = CALLOC_STRUCT(lp_fragment_shader_variant); + if(!variant) + return NULL; + + variant->shader = shader; + memcpy(&variant->key, key, sizeof *key); + + /* TODO: actually pick these based on the fs and color buffer + * characteristics. */ + + fs_type.value = 0; + fs_type.floating = TRUE; /* floating point values */ + fs_type.sign = TRUE; /* values are signed */ + fs_type.norm = FALSE; /* values are not limited to [0,1] or [-1,1] */ + fs_type.width = 32; /* 32-bit float */ + fs_type.length = 4; /* 4 element per vector */ + num_fs = 4; + + blend_type.value = 0; + blend_type.floating = FALSE; /* values are integers */ + blend_type.sign = FALSE; /* values are unsigned */ + blend_type.norm = TRUE; /* values are in [0,1] or [-1,1] */ + blend_type.width = 8; /* 8-bit ubyte values */ + blend_type.length = 16; /* 16 elements per vector */ + + /* + * Generate the function prototype. Any change here must be reflected in + * lp_jit.h's lp_jit_frag_func function pointer type, and vice-versa. + */ + + fs_elem_type = lp_build_elem_type(fs_type); + fs_vec_type = lp_build_vec_type(fs_type); + fs_int_vec_type = lp_build_int_vec_type(fs_type); + + blend_vec_type = lp_build_vec_type(blend_type); + blend_int_vec_type = lp_build_int_vec_type(blend_type); + + arg_types[0] = screen->context_ptr_type; /* context */ + arg_types[1] = LLVMInt32Type(); /* x */ + arg_types[2] = LLVMInt32Type(); /* y */ + arg_types[3] = LLVMPointerType(fs_elem_type, 0); /* a0 */ + arg_types[4] = LLVMPointerType(fs_elem_type, 0); /* dadx */ + arg_types[5] = LLVMPointerType(fs_elem_type, 0); /* dady */ + arg_types[6] = LLVMPointerType(fs_int_vec_type, 0); /* mask */ + arg_types[7] = LLVMPointerType(blend_vec_type, 0); /* color */ + arg_types[8] = LLVMPointerType(fs_int_vec_type, 0); /* depth */ + + func_type = LLVMFunctionType(LLVMVoidType(), arg_types, Elements(arg_types), 0); + + variant->function = LLVMAddFunction(screen->module, "shader", func_type); + LLVMSetFunctionCallConv(variant->function, LLVMCCallConv); + for(i = 0; i < Elements(arg_types); ++i) + if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind) + LLVMAddAttribute(LLVMGetParam(variant->function, i), LLVMNoAliasAttribute); + + context_ptr = LLVMGetParam(variant->function, 0); + x = LLVMGetParam(variant->function, 1); + y = LLVMGetParam(variant->function, 2); + a0_ptr = LLVMGetParam(variant->function, 3); + dadx_ptr = LLVMGetParam(variant->function, 4); + dady_ptr = LLVMGetParam(variant->function, 5); + mask_ptr = LLVMGetParam(variant->function, 6); + color_ptr = LLVMGetParam(variant->function, 7); + depth_ptr = LLVMGetParam(variant->function, 8); + + lp_build_name(context_ptr, "context"); + lp_build_name(x, "x"); + lp_build_name(y, "y"); + lp_build_name(a0_ptr, "a0"); + lp_build_name(dadx_ptr, "dadx"); + lp_build_name(dady_ptr, "dady"); + lp_build_name(mask_ptr, "mask"); + lp_build_name(color_ptr, "color"); + lp_build_name(depth_ptr, "depth"); + + /* + * Function body + */ + + block = LLVMAppendBasicBlock(variant->function, "entry"); + builder = LLVMCreateBuilder(); + LLVMPositionBuilderAtEnd(builder, block); + + generate_pos0(builder, x, y, &x0, &y0); + + lp_build_interp_soa_init(&interp, shader->base.tokens, builder, fs_type, + a0_ptr, dadx_ptr, dady_ptr, + x0, y0, 2, 0); + +#if 0 + /* C texture sampling */ + sampler = lp_c_sampler_soa_create(context_ptr); +#else + /* code generated texture sampling */ + sampler = lp_llvm_sampler_soa_create(key->sampler, context_ptr); +#endif + + for(i = 0; i < num_fs; ++i) { + LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), i, 0); + LLVMValueRef out_color[NUM_CHANNELS]; + LLVMValueRef depth_ptr_i; + + if(i != 0) + lp_build_interp_soa_update(&interp); + + fs_mask[i] = LLVMBuildLoad(builder, LLVMBuildGEP(builder, mask_ptr, &index, 1, ""), ""); + depth_ptr_i = LLVMBuildGEP(builder, depth_ptr, &index, 1, ""); + + generate_fs(lp, shader, key, + builder, + fs_type, + context_ptr, + i, + &interp, + sampler, + &fs_mask[i], + out_color, + depth_ptr_i); + + for(chan = 0; chan < NUM_CHANNELS; ++chan) + fs_out_color[chan][i] = out_color[chan]; + } + + sampler->destroy(sampler); + + /* + * Convert the fs's output color and mask to fit to the blending type. + */ + + for(chan = 0; chan < NUM_CHANNELS; ++chan) { + lp_build_conv(builder, fs_type, blend_type, + fs_out_color[chan], num_fs, + &blend_in_color[chan], 1); + lp_build_name(blend_in_color[chan], "color.%c", "rgba"[chan]); + + } + + lp_build_conv_mask(builder, fs_type, blend_type, + fs_mask, num_fs, + &blend_mask, 1); + + /* + * Blending. + */ + + generate_blend(&key->blend, + builder, + blend_type, + context_ptr, + blend_mask, + blend_in_color, + color_ptr); + + LLVMBuildRetVoid(builder); + + LLVMDisposeBuilder(builder); + + /* + * Translate the LLVM IR into machine code. + */ + + LLVMRunFunctionPassManager(screen->pass, variant->function); + +#ifdef DEBUG + LLVMDumpValue(variant->function); + debug_printf("\n"); +#endif + + if(LLVMVerifyFunction(variant->function, LLVMPrintMessageAction)) { + LLVMDumpValue(variant->function); + abort(); + } + + variant->jit_function = (lp_jit_frag_func)LLVMGetPointerToGlobal(screen->engine, variant->function); + +#ifdef DEBUG + lp_disassemble(variant->jit_function); +#endif + + variant->next = shader->variants; + shader->variants = variant; + + return variant; +} + + +void * +llvmpipe_create_fs_state(struct pipe_context *pipe, + const struct pipe_shader_state *templ) +{ + struct lp_fragment_shader *shader; + + shader = CALLOC_STRUCT(lp_fragment_shader); + if (!shader) + return NULL; + + /* get/save the summary info for this shader */ + tgsi_scan_shader(templ->tokens, &shader->info); + + /* we need to keep a local copy of the tokens */ + shader->base.tokens = tgsi_dup_tokens(templ->tokens); + + return shader; +} + + +void +llvmpipe_bind_fs_state(struct pipe_context *pipe, void *fs) +{ + struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe); + + llvmpipe->fs = (struct lp_fragment_shader *) fs; + + llvmpipe->dirty |= LP_NEW_FS; +} + + +void +llvmpipe_delete_fs_state(struct pipe_context *pipe, void *fs) +{ + struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe); + struct llvmpipe_screen *screen = llvmpipe_screen(pipe->screen); + struct lp_fragment_shader *shader = fs; + struct lp_fragment_shader_variant *variant; + + assert(fs != llvmpipe->fs); + + variant = shader->variants; + while(variant) { + struct lp_fragment_shader_variant *next = variant->next; + + if(variant->function) { + if(variant->jit_function) + LLVMFreeMachineCodeForFunction(screen->engine, variant->function); + LLVMDeleteFunction(variant->function); + } + + FREE(variant); + + variant = next; + } + + FREE((void *) shader->base.tokens); + FREE(shader); +} + + + +void +llvmpipe_set_constant_buffer(struct pipe_context *pipe, + uint shader, uint index, + const struct pipe_constant_buffer *buf) +{ + struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe); + + assert(shader < PIPE_SHADER_TYPES); + assert(index == 0); + + /* note: reference counting */ + pipe_buffer_reference(&llvmpipe->constants[shader].buffer, + buf ? buf->buffer : NULL); + + llvmpipe->dirty |= LP_NEW_CONSTANTS; +} + + +/** + * We need to generate several variants of the fragment pipeline to match + * all the combinations of the contributing state atoms. + * + * TODO: there is actually no reason to tie this to context state -- the + * generated code could be cached globally in the screen. + */ +static void +make_variant_key(struct llvmpipe_context *lp, + struct lp_fragment_shader *shader, + struct lp_fragment_shader_variant_key *key) +{ + unsigned i; + + memset(key, 0, sizeof *key); + + if(lp->framebuffer.zsbuf && + lp->depth_stencil->depth.enabled) { + key->zsbuf_format = lp->framebuffer.zsbuf->format; + memcpy(&key->depth, &lp->depth_stencil->depth, sizeof key->depth); + } + + key->alpha.enabled = lp->depth_stencil->alpha.enabled; + if(key->alpha.enabled) + key->alpha.func = lp->depth_stencil->alpha.func; + /* alpha.ref_value is passed in jit_context */ + + if(lp->framebuffer.cbufs[0]) { + const struct util_format_description *format_desc; + unsigned chan; + + memcpy(&key->blend, lp->blend, sizeof key->blend); + + format_desc = util_format_description(lp->framebuffer.cbufs[0]->format); + assert(format_desc->layout == UTIL_FORMAT_COLORSPACE_RGB || + format_desc->layout == UTIL_FORMAT_COLORSPACE_SRGB); + + /* mask out color channels not present in the color buffer */ + for(chan = 0; chan < 4; ++chan) { + enum util_format_swizzle swizzle = format_desc->swizzle[chan]; + if(swizzle > 4) + key->blend.colormask &= ~(1 << chan); + } + } + + for(i = 0; i < PIPE_MAX_SAMPLERS; ++i) + if(shader->info.file_mask[TGSI_FILE_SAMPLER] & (1 << i)) + lp_sampler_static_state(&key->sampler[i], lp->texture[i], lp->sampler[i]); +} + + +void +llvmpipe_update_fs(struct llvmpipe_context *lp) +{ + struct lp_fragment_shader *shader = lp->fs; + struct lp_fragment_shader_variant_key key; + struct lp_fragment_shader_variant *variant; + + make_variant_key(lp, shader, &key); + + variant = shader->variants; + while(variant) { + if(memcmp(&variant->key, &key, sizeof key) == 0) + break; + + variant = variant->next; + } + + if(!variant) + variant = generate_fragment(lp, shader, &key); + + shader->current = variant; +} |