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243 lines
8.5 KiB
C++
243 lines
8.5 KiB
C++
// Copyright 2017 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "VideoCommon/TextureConverterShaderGen.h"
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#include "Common/Assert.h"
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#include "Common/CommonTypes.h"
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#include "VideoCommon/BPMemory.h"
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#include "VideoCommon/TextureCacheBase.h"
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#include "VideoCommon/VideoCommon.h"
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#include "VideoCommon/VideoConfig.h"
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namespace TextureConversionShaderGen
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{
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TCShaderUid GetShaderUid(EFBCopyFormat dst_format, bool is_depth_copy, bool is_intensity,
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bool scale_by_half, float gamma_rcp,
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const std::array<u32, 3>& filter_coefficients)
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{
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TCShaderUid out;
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UidData* const uid_data = out.GetUidData();
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uid_data->dst_format = dst_format;
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uid_data->efb_has_alpha = bpmem.zcontrol.pixel_format == PixelFormat::RGBA6_Z24;
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uid_data->is_depth_copy = is_depth_copy;
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uid_data->is_intensity = is_intensity;
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uid_data->scale_by_half = scale_by_half;
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uid_data->all_copy_filter_coefs_needed =
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TextureCacheBase::AllCopyFilterCoefsNeeded(filter_coefficients);
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uid_data->copy_filter_can_overflow = TextureCacheBase::CopyFilterCanOverflow(filter_coefficients);
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// If the gamma is needed, then include that too.
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uid_data->apply_gamma = gamma_rcp != 1.0f;
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return out;
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}
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static void WriteHeader(APIType api_type, ShaderCode& out)
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{
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out.Write("UBO_BINDING(std140, 1) uniform PSBlock {{\n"
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" float2 src_offset, src_size;\n"
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" uint3 filter_coefficients;\n"
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" float gamma_rcp;\n"
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" float2 clamp_tb;\n"
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" float pixel_height;\n"
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"}};\n");
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}
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ShaderCode GenerateVertexShader(APIType api_type)
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{
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ShaderCode out;
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WriteHeader(api_type, out);
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if (g_ActiveConfig.backend_info.bSupportsGeometryShaders)
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{
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out.Write("VARYING_LOCATION(0) out VertexData {{\n"
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" float3 v_tex0;\n"
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"}};\n");
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}
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else
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{
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out.Write("VARYING_LOCATION(0) out float3 v_tex0;\n");
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}
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out.Write("#define id gl_VertexID\n"
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"#define opos gl_Position\n"
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"void main() {{\n");
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out.Write(" v_tex0 = float3(float((id << 1) & 2), float(id & 2), 0.0f);\n");
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out.Write(
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" opos = float4(v_tex0.xy * float2(2.0f, -2.0f) + float2(-1.0f, 1.0f), 0.0f, 1.0f);\n");
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out.Write(" v_tex0 = float3(src_offset + (src_size * v_tex0.xy), 0.0f);\n");
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// NDC space is flipped in Vulkan
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if (api_type == APIType::Vulkan)
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out.Write(" opos.y = -opos.y;\n");
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out.Write("}}\n");
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return out;
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}
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ShaderCode GeneratePixelShader(APIType api_type, const UidData* uid_data)
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{
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const bool mono_depth = uid_data->is_depth_copy && g_ActiveConfig.bStereoEFBMonoDepth;
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ShaderCode out;
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WriteHeader(api_type, out);
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out.Write("SAMPLER_BINDING(0) uniform sampler2DArray samp0;\n");
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out.Write("uint4 SampleEFB(float3 uv, float y_offset) {{\n"
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" float4 tex_sample = texture(samp0, float3(uv.x, clamp(uv.y + (y_offset * "
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"pixel_height), clamp_tb.x, clamp_tb.y), {}));\n",
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mono_depth ? "0.0" : "uv.z");
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if (uid_data->is_depth_copy)
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{
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if (!g_ActiveConfig.backend_info.bSupportsReversedDepthRange)
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out.Write(" tex_sample.x = 1.0 - tex_sample.x;\n");
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out.Write(" uint depth = uint(tex_sample.x * 16777216.0);\n"
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" return uint4((depth >> 16) & 255u, (depth >> 8) & 255u, depth & 255u, 255u);\n"
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"}}\n");
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}
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else
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{
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out.Write(" return uint4(tex_sample * 255.0);\n"
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"}}\n");
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}
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if (g_ActiveConfig.backend_info.bSupportsGeometryShaders)
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{
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out.Write("VARYING_LOCATION(0) in VertexData {{\n"
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" float3 v_tex0;\n"
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"}};\n");
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}
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else
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{
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out.Write("VARYING_LOCATION(0) in vec3 v_tex0;\n");
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}
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out.Write("FRAGMENT_OUTPUT_LOCATION(0) out vec4 ocol0;\n"
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"void main()\n{{\n");
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// The copy filter applies to both color and depth copies. This has been verified on hardware.
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// The filter is only applied to the RGB channels, the alpha channel is left intact.
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if (uid_data->all_copy_filter_coefs_needed)
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{
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out.Write(" uint4 prev_row = SampleEFB(v_tex0, -1.0f);\n"
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" uint4 current_row = SampleEFB(v_tex0, 0.0f);\n"
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" uint4 next_row = SampleEFB(v_tex0, 1.0f);\n"
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" uint3 combined_rows = prev_row.rgb * filter_coefficients[0] +\n"
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" current_row.rgb * filter_coefficients[1] +\n"
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" next_row.rgb * filter_coefficients[2];\n");
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}
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else
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{
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out.Write(" uint4 current_row = SampleEFB(v_tex0, 0.0f);\n"
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" uint3 combined_rows = current_row.rgb * filter_coefficients[1];\n");
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}
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out.Write(" // Shift right by 6 to divide by 64, as filter coefficients\n"
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" // that sum to 64 result in no change in brightness\n"
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" uint4 texcol_raw = uint4(combined_rows.rgb >> 6, {});\n",
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uid_data->efb_has_alpha ? "current_row.a" : "255");
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if (uid_data->copy_filter_can_overflow)
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out.Write(" texcol_raw &= 0x1ffu;\n");
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// Note that overflow occurs when the sum of values is >= 128, but this max situation can be hit
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// on >= 64, so we always include it.
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out.Write(" texcol_raw = min(texcol_raw, uint4(255, 255, 255, 255));\n");
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if (uid_data->apply_gamma)
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{
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out.Write(" texcol_raw = uint4(round(pow(abs(float4(texcol_raw) / 255.0),\n"
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" float4(gamma_rcp, gamma_rcp, gamma_rcp, 1.0)) * 255.0));\n");
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}
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if (uid_data->is_intensity)
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{
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out.Write(" // Intensity/YUV format conversion constants determined by hardware testing\n"
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" const float4 y_const = float4( 66, 129, 25, 16);\n"
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" const float4 u_const = float4(-38, -74, 112, 128);\n"
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" const float4 v_const = float4(112, -94, -18, 128);\n"
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" // Intensity/YUV format conversion\n"
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" texcol_raw.rgb = uint3(dot(y_const, float4(texcol_raw.rgb, 256)),\n"
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" dot(u_const, float4(texcol_raw.rgb, 256)),\n"
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" dot(v_const, float4(texcol_raw.rgb, 256)));\n"
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" // Divide by 256 and round .5 and higher up\n"
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" texcol_raw.rgb = (texcol_raw.rgb >> 8) + ((texcol_raw.rgb >> 7) & 1);\n");
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}
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switch (uid_data->dst_format)
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{
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case EFBCopyFormat::R4: // R4
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out.Write(" float red = float(texcol_raw.r & 0xF0u) / 240.0;\n"
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" ocol0 = float4(red, red, red, red);\n");
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break;
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case EFBCopyFormat::R8_0x1: // R8
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case EFBCopyFormat::R8: // R8
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out.Write(" ocol0 = float4(texcol_raw).rrrr / 255.0;\n");
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break;
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case EFBCopyFormat::RA4: // RA4
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out.Write(" float2 red_alpha = float2(texcol_raw.ra & 0xF0u) / 240.0;\n"
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" ocol0 = red_alpha.rrrg;\n");
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break;
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case EFBCopyFormat::RA8: // RA8
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out.Write(" ocol0 = float4(texcol_raw).rrra / 255.0;\n");
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break;
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case EFBCopyFormat::A8: // A8
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out.Write(" ocol0 = float4(texcol_raw).aaaa / 255.0;\n");
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break;
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case EFBCopyFormat::G8: // G8
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out.Write(" ocol0 = float4(texcol_raw).gggg / 255.0;\n");
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break;
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case EFBCopyFormat::B8: // B8
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out.Write(" ocol0 = float4(texcol_raw).bbbb / 255.0;\n");
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break;
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case EFBCopyFormat::RG8: // RG8
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out.Write(" ocol0 = float4(texcol_raw).rrrg / 255.0;\n");
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break;
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case EFBCopyFormat::GB8: // GB8
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out.Write(" ocol0 = float4(texcol_raw).gggb / 255.0;\n");
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break;
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case EFBCopyFormat::RGB565: // RGB565
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out.Write(" float2 red_blue = float2(texcol_raw.rb & 0xF8u) / 248.0;\n"
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" float green = float(texcol_raw.g & 0xFCu) / 252.0;\n"
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" ocol0 = float4(red_blue.r, green, red_blue.g, 1.0);\n");
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break;
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case EFBCopyFormat::RGB5A3: // RGB5A3
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// TODO: The MSB controls whether we have RGB5 or RGB4A3, this selection
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// will need to be implemented once we move away from floats.
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out.Write(" float3 color = float3(texcol_raw.rgb & 0xF8u) / 248.0;\n"
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" float alpha = float(texcol_raw.a & 0xE0u) / 224.0;\n"
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" ocol0 = float4(color, alpha);\n");
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break;
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case EFBCopyFormat::RGBA8: // RGBA8
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out.Write(" ocol0 = float4(texcol_raw.rgba) / 255.0;\n");
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break;
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case EFBCopyFormat::XFB:
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out.Write(" ocol0 = float4(float3(texcol_raw.rgb) / 255.0, 1.0);\n");
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break;
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default:
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ERROR_LOG_FMT(VIDEO, "Unknown copy/intensity color format: {} {}", uid_data->dst_format,
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uid_data->is_intensity);
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out.Write(" ocol0 = float4(texcol_raw.rgba) / 255.0;\n");
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break;
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}
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out.Write("}}\n");
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return out;
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}
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} // namespace TextureConversionShaderGen
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