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VideoCommon: move depth logic to a callable function in PixelShaderGen
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iwubcode
parent
c770e7c276
commit
e616078752
1 changed files with 80 additions and 61 deletions
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@ -885,6 +885,70 @@ void WriteCustomShaderStructImpl(ShaderCode* out, u32 num_stages, bool per_pixel
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out->Write("\tcustom_data.time_ms = time_ms;\n");
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}
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void WriteDepthHeader(APIType api_type, const ShaderHostConfig& host_config,
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const pixel_shader_uid_data* uid_data, ShaderCode& out)
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{
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out.Write("int dolphin_calculate_zcoord(vec4 rawpos, vec4 clipPos, ivec4 last_stage_texmap)\n");
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out.Write("{{\n");
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if (uid_data->zfreeze)
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{
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out.SetConstantsUsed(C_ZSLOPE, C_ZSLOPE);
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out.SetConstantsUsed(C_EFBSCALE, C_EFBSCALE);
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out.Write("\tvec2 screenpos = rawpos.xy * " I_EFBSCALE ".xy;\n");
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// Opengl has reversed vertical screenspace coordinates
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if (api_type == APIType::OpenGL)
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out.Write("\tscreenpos.y = {}.0 - screenpos.y;\n", EFB_HEIGHT);
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out.Write("\tint zCoord = int(" I_ZSLOPE ".z + " I_ZSLOPE ".x * screenpos.x + " I_ZSLOPE
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".y * screenpos.y);\n");
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}
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else if (!host_config.fast_depth_calc)
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{
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// FastDepth means to trust the depth generated in perspective division.
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// It should be correct, but it seems not to be as accurate as required. TODO: Find out why!
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// For disabled FastDepth we just calculate the depth value again.
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// The performance impact of this additional calculation doesn't matter, but it prevents
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// the host GPU driver from performing any early depth test optimizations.
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out.SetConstantsUsed(C_ZBIAS + 1, C_ZBIAS + 1);
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// the screen space depth value = far z + (clip z / clip w) * z range
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out.Write("\tint zCoord = " I_ZBIAS "[1].x + int((clipPos.z / clipPos.w) * float(" I_ZBIAS
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"[1].y));\n");
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}
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else
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{
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if (!host_config.backend_reversed_depth_range)
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out.Write("\tint zCoord = int((1.0 - rawpos.z) * 16777216.0);\n");
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else
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out.Write("\tint zCoord = int(rawpos.z * 16777216.0);\n");
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}
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out.Write("\tzCoord = clamp(zCoord, 0, 0xFFFFFF);\n");
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// depth texture can safely be ignored if the result won't be written to the depth buffer
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// (early_ztest) and isn't used for fog either
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const bool skip_ztexture = !uid_data->per_pixel_depth && uid_data->fog_fsel == FogType::Off;
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// Note: depth texture output is only written to depth buffer if late depth test is used
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// theoretical final depth value is used for fog calculation, though, so we have to emulate
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// ztextures anyway
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if (uid_data->ztex_op != ZTexOp::Disabled && !skip_ztexture)
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{
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// use the texture input of the last texture stage, hopefully this has been read and
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// is in correct format...
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out.SetConstantsUsed(C_ZBIAS, C_ZBIAS + 1);
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out.Write("\tzCoord = idot(" I_ZBIAS "[0].xyzw, last_stage_texmap.xyzw) + " I_ZBIAS
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"[1].w {};\n",
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(uid_data->ztex_op == ZTexOp::Add) ? "+ zCoord" : "");
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out.Write("\tzCoord = zCoord & 0xFFFFFF;\n");
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}
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out.Write("\treturn zCoord;\n");
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out.Write("}}\n\n");
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}
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static void WriteStage(ShaderCode& out, const pixel_shader_uid_data* uid_data, int n,
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APIType api_type, bool stereo, bool has_custom_shaders);
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static void WriteTevRegular(ShaderCode& out, std::string_view components, TevBias bias, TevOp op,
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@ -918,6 +982,7 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
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WriteBitfieldExtractHeader(out, api_type, host_config);
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WritePixelShaderCommonHeader(out, api_type, host_config, uid_data->bounding_box, custom_details);
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WriteDepthHeader(api_type, host_config, uid_data, out);
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// Custom shader details
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WriteCustomShaderStructDef(&out, uid_data->genMode_numtexgens);
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@ -1232,71 +1297,25 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
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"\t// but doesn't do anything in blending\n"
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"\tif (prev.a == 1) prev.a = 0;\n");
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if (uid_data->zfreeze)
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const bool write_depth =
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uid_data->ztest == EmulatedZ::Early || uid_data->ztest == EmulatedZ::EarlyWithFBFetch ||
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uid_data->ztest == EmulatedZ::EarlyWithZComplocHack || uid_data->ztest == EmulatedZ::Late;
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const bool needs_depth = uid_data->per_pixel_depth && write_depth;
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const bool needs_zcoord = needs_depth || uid_data->fog_fsel != FogType::Off;
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if (needs_zcoord)
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{
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out.SetConstantsUsed(C_ZSLOPE, C_ZSLOPE);
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out.SetConstantsUsed(C_EFBSCALE, C_EFBSCALE);
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out.Write("\tfloat2 screenpos = rawpos.xy * " I_EFBSCALE ".xy;\n");
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// Opengl has reversed vertical screenspace coordinates
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if (api_type == APIType::OpenGL)
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out.Write("\tscreenpos.y = {}.0 - screenpos.y;\n", EFB_HEIGHT);
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out.Write("\tint zCoord = int(" I_ZSLOPE ".z + " I_ZSLOPE ".x * screenpos.x + " I_ZSLOPE
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".y * screenpos.y);\n");
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}
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else if (!host_config.fast_depth_calc)
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{
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// FastDepth means to trust the depth generated in perspective division.
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// It should be correct, but it seems not to be as accurate as required. TODO: Find out why!
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// For disabled FastDepth we just calculate the depth value again.
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// The performance impact of this additional calculation doesn't matter, but it prevents
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// the host GPU driver from performing any early depth test optimizations.
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out.SetConstantsUsed(C_ZBIAS + 1, C_ZBIAS + 1);
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// the screen space depth value = far z + (clip z / clip w) * z range
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out.Write("\tint zCoord = " I_ZBIAS "[1].x + int((clipPos.z / clipPos.w) * float(" I_ZBIAS
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"[1].y));\n");
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}
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else
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{
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if (!host_config.backend_reversed_depth_range)
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out.Write("\tint zCoord = int((1.0 - rawpos.z) * 16777216.0);\n");
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if (!host_config.fast_depth_calc)
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{
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out.Write("\tint zCoord = dolphin_calculate_zcoord(rawpos, clipPos, textemp);\n");
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}
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else
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out.Write("\tint zCoord = int(rawpos.z * 16777216.0);\n");
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}
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out.Write("\tzCoord = clamp(zCoord, 0, 0xFFFFFF);\n");
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// depth texture can safely be ignored if the result won't be written to the depth buffer
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// (early_ztest) and isn't used for fog either
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const bool skip_ztexture = !uid_data->per_pixel_depth && uid_data->fog_fsel == FogType::Off;
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// Note: z-textures are not written to depth buffer if early depth test is used
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const bool early_ztest = uid_data->ztest == EmulatedZ::Early ||
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uid_data->ztest == EmulatedZ::EarlyWithFBFetch ||
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uid_data->ztest == EmulatedZ::EarlyWithZComplocHack;
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if (uid_data->per_pixel_depth && early_ztest)
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{
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if (!host_config.backend_reversed_depth_range)
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out.Write("\tdepth = 1.0 - float(zCoord) / 16777216.0;\n");
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else
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out.Write("\tdepth = float(zCoord) / 16777216.0;\n");
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{
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out.Write("\tint zCoord = dolphin_calculate_zcoord(rawpos, vec4(0, 0, 0, 0), "
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"textemp);\n");
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}
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}
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// Note: depth texture output is only written to depth buffer if late depth test is used
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// theoretical final depth value is used for fog calculation, though, so we have to emulate
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// ztextures anyway
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if (uid_data->ztex_op != ZTexOp::Disabled && !skip_ztexture)
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{
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// use the texture input of the last texture stage (textemp), hopefully this has been read and
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// is in correct format...
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out.SetConstantsUsed(C_ZBIAS, C_ZBIAS + 1);
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out.Write("\tzCoord = idot(" I_ZBIAS "[0].xyzw, textemp.xyzw) + " I_ZBIAS "[1].w {};\n",
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(uid_data->ztex_op == ZTexOp::Add) ? "+ zCoord" : "");
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out.Write("\tzCoord = zCoord & 0xFFFFFF;\n");
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}
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if (uid_data->per_pixel_depth && uid_data->ztest == EmulatedZ::Late)
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if (needs_depth)
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{
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if (!host_config.backend_reversed_depth_range)
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out.Write("\tdepth = 1.0 - float(zCoord) / 16777216.0;\n");
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