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Created Shader assembly loading (markdown)
Yours3lf
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Shader-assembly-loading.md
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205
Shader-assembly-loading.md
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Shader assembly and corresponding assemlby-to-descriptor (and push constant) mapping can be passed to the driver the following way. Pay attention to the SPIR-V magic constants passed as those signal the driver that it's receiving assembly data. You need to include driver/vkExt.h for the structure definitions.
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The QPU assembler included with the driver can be used to write assembly code in human readable code and convert it to binary form. QPUassembler/qpu_assembler.h/c
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```
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char vs_asm_code[] =
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///0x40000000 = 2.0
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///uni = 1.0
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///rb0 = 2 - 1 = 1
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"sig_small_imm ; rx0 = fsub.ws.always(b, a, uni, 0x40000000) ; nop = nop(r0, r0) ;\n"
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///set up VPM read for subsequent reads
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///0x00201a00: 0000 0000 0010 0000 0001 1010 0000 0000
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///addr: 0
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///size: 32bit
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///packed
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///horizontal
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///stride=1
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///vectors to read = 2 (how many components)
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"sig_load_imm ; vr_setup = load32.always(0x00201a00) ; nop = load32.always() ;\n"
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///uni = viewportXScale
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///r0 = vpm * uni
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"sig_none ; nop = nop(r0, r0, vpm_read, uni) ; r0 = fmul.always(a, b) ;\n"
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///r1 = r0 * rb0 (1)
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"sig_none ; nop = nop(r0, r0, nop, rb0) ; r1 = fmul.always(r0, b) ;\n"
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///uni = viewportYScale
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///ra0.16a = int(r1), r2 = vpm * uni
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"sig_none ; rx0.16a = ftoi.always(r1, r1, vpm_read, uni) ; r2 = fmul.always(a, b) ;\n"
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///r3 = r2 * rb0
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"sig_none ; nop = nop(r0, r0, nop, rb0) ; r3 = fmul.always(r2, b) ;\n"
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///ra0.16b = int(r3)
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"sig_none ; rx0.16b = ftoi.always(r3, r3) ; nop = nop(r0, r0) ;\n"
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///set up VPM write for subsequent writes
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///0x00001a00: 0000 0000 0000 0000 0001 1010 0000 0000
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///addr: 0
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///size: 32bit
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///horizontal
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///stride = 1
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"sig_load_imm ; vw_setup = load32.always.ws(0x00001a00) ; nop = load32.always() ;\n"
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///shaded vertex format for PSE
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/// Ys and Xs
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///vpm = ra0
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"sig_none ; vpm = or.always(a, a, ra0, nop) ; nop = nop(r0, r0);\n"
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/// Zs
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///uni = 0.5
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///vpm = uni
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"sig_none ; vpm = or.always(a, a, uni, nop) ; nop = nop(r0, r0);\n"
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/// 1.0 / Wc
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///vpm = rb0 (1)
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"sig_none ; vpm = or.always(b, b, nop, rb0) ; nop = nop(r0, r0);\n"
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///END
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"sig_end ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
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"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
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"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
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"\0";
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char cs_asm_code[] =
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///uni = 1.0
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///r3 = 2.0 - uni
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"sig_small_imm ; r3 = fsub.always(b, a, uni, 0x40000000) ; nop = nop(r0, r0);\n"
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"sig_load_imm ; vr_setup = load32.always(0x00201a00) ; nop = load32.always() ;\n"
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///r2 = vpm
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"sig_none ; r2 = or.always(a, a, vpm_read, nop) ; nop = nop(r0, r0);\n"
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"sig_load_imm ; vw_setup = load32.always.ws(0x00001a00) ; nop = load32.always() ;\n"
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///shaded coordinates format for PTB
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/// write Xc
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///r1 = vpm, vpm = r2
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"sig_none ; r1 = or.always(a, a, vpm_read, nop) ; vpm = v8min.always(r2, r2);\n"
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/// write Yc
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///uni = viewportXscale
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///vpm = r1, r2 = r2 * uni
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"sig_none ; vpm = or.always(r1, r1, uni, nop) ; r2 = fmul.always(r2, a);\n"
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///uni = viewportYscale
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///r1 = r1 * uni
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"sig_none ; nop = nop(r0, r0, uni, nop) ; r1 = fmul.always(r1, a);\n"
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///r0 = r2 * r3
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"sig_none ; nop = nop(r0, r0) ; r0 = fmul.always(r2, r3);\n"
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///ra0.16a = r0, r1 = r1 * r3
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"sig_none ; rx0.16a = ftoi.always(r0, r0) ; r1 = fmul.always(r1, r3) ;\n"
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///ra0.16b = r1
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"sig_none ; rx0.16b = ftoi.always(r1, r1) ; nop = nop(r0, r0) ;\n"
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///write Zc
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///vpm = 0
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"sig_small_imm ; vpm = or.always(b, b, nop, 0) ; nop = nop(r0, r0) ;\n"
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///write Wc
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///vpm = 1.0
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"sig_small_imm ; vpm = or.always(b, b, nop, 0x3f800000) ; nop = nop(r0, r0) ;\n"
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///write Ys and Xs
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///vpm = ra0
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"sig_none ; vpm = or.always(a, a, ra0, nop) ; nop = nop(r0, r0) ;\n"
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///write Zs
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///uni = 0.5
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///vpm = uni
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"sig_none ; vpm = or.always(a, a, uni, nop) ; nop = nop(r0, r0) ;\n"
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///write 1/Wc
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///vpm = r3
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"sig_none ; vpm = or.always(r3, r3) ; nop = nop(r0, r0) ;\n"
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///END
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"sig_end ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
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"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
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"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;\n"
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"\0";
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//display a color
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char fs_asm_code[] =
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"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
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///BGRA
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"sig_load_imm ; r0 = load32.always(0xffa14ccc) ; nop = load32() ;"
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"sig_none ; tlb_color_all = or.always(r0, r0) ; nop = nop(r0, r0) ;"
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"sig_end ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
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"sig_none ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
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"sig_unlock_score ; nop = nop(r0, r0) ; nop = nop(r0, r0) ;"
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"\0";
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VkRpiAssemblyMappingEXT vertexMappings[] = {
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//vertex shader uniforms
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{
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VK_RPI_ASSEMBLY_MAPPING_TYPE_PUSH_CONSTANT,
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VK_DESCRIPTOR_TYPE_MAX_ENUM, //descriptor type
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0, //descriptor set #
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0, //descriptor binding #
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0, //descriptor array element #
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0, //resource offset
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},
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{
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VK_RPI_ASSEMBLY_MAPPING_TYPE_PUSH_CONSTANT,
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VK_DESCRIPTOR_TYPE_MAX_ENUM, //descriptor type
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0, //descriptor set #
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0, //descriptor binding #
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0, //descriptor array element #
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4, //resource offset
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},
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{
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VK_RPI_ASSEMBLY_MAPPING_TYPE_PUSH_CONSTANT,
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VK_DESCRIPTOR_TYPE_MAX_ENUM, //descriptor type
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0, //descriptor set #
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0, //descriptor binding #
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0, //descriptor array element #
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8, //resource offset
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},
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{
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VK_RPI_ASSEMBLY_MAPPING_TYPE_PUSH_CONSTANT,
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VK_DESCRIPTOR_TYPE_MAX_ENUM, //descriptor type
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0, //descriptor set #
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0, //descriptor binding #
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0, //descriptor array element #
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12, //resource offset
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}
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};
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uint32_t spirv[6];
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uint64_t* asm_ptrs[4] = {};
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uint32_t asm_sizes[4] = {};
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VkRpiAssemblyMappingEXT* asm_mappings[4] = {};
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uint32_t asm_mappings_sizes[4] = {};
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VkRpiShaderModuleAssemblyCreateInfoEXT shaderModuleCreateInfo = {};
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shaderModuleCreateInfo.instructions = asm_ptrs;
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shaderModuleCreateInfo.numInstructions = asm_sizes;
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shaderModuleCreateInfo.mappings = asm_mappings;
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shaderModuleCreateInfo.numMappings = asm_mappings_sizes;
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asm_mappings[VK_RPI_ASSEMBLY_TYPE_VERTEX] = vertexMappings;
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asm_mappings_sizes[VK_RPI_ASSEMBLY_TYPE_VERTEX] = sizeof(vertexMappings) / sizeof(VkRpiAssemblyMappingEXT);
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{ //assemble cs code
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asm_sizes[0] = get_num_instructions(cs_asm_code);
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uint32_t size = sizeof(uint64_t)*asm_sizes[0];
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asm_ptrs[0] = (uint64_t*)malloc(size);
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//modifies the passed string's contents
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assemble_qpu_asm(cs_asm_code, asm_ptrs[0]);
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}
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{ //assemble vs code
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asm_sizes[1] = get_num_instructions(vs_asm_code);
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uint32_t size = sizeof(uint64_t)*asm_sizes[1];
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asm_ptrs[1] = (uint64_t*)malloc(size);
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assemble_qpu_asm(vs_asm_code, asm_ptrs[1]);
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}
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{ //assemble fs code
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asm_sizes[2] = get_num_instructions(fs_asm_code);
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uint32_t size = sizeof(uint64_t)*asm_sizes[2];
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asm_ptrs[2] = (uint64_t*)malloc(size);
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assemble_qpu_asm(fs_asm_code, asm_ptrs[2]);
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}
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spirv[0] = 0x07230203;
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spirv[1] = 0x00010000;
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spirv[2] = 0x14E45250;
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spirv[3] = 1;
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spirv[4] = (uint32_t)&shaderModuleCreateInfo;
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//words start here
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spirv[5] = 1 << 16;
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VkShaderModuleCreateInfo smci = {};
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smci.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
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smci.codeSize = sizeof(uint32_t)*6;
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smci.pCode = spirv;
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vkCreateShaderModule(device, &smci, 0, &shaderModule);
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for(uint32_t c = 0; c < 4; ++c)
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{
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free(asm_ptrs[c]);
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}
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```
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