mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2024-09-21 20:01:40 +02:00
1b771deb56
Previously it was packed into spare slots in clippos.xy and normal.w, but it's ugly and more importantly it's causing bugs. This was discovered during the debugging of a zfreeze branch, which expected clippos.xy to be xy position coordinates in clipspace (as the name suggested). Turns out the stereoscopy shader had also run into this trap, modifying clippos.x (introducing errors with per-pixel lighting). This commit has been moved outside of the zfreeze PR for fast merging.
338 lines
11 KiB
C++
338 lines
11 KiB
C++
// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#include <cmath>
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#include "VideoCommon/BPMemory.h"
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#include "VideoCommon/GeometryShaderGen.h"
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#include "VideoCommon/LightingShaderGen.h"
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#include "VideoCommon/VertexShaderGen.h"
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#include "VideoCommon/VideoConfig.h"
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static char text[16384];
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static const char* primitives_ogl[] =
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{
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"points",
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"lines",
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"triangles"
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};
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static const char* primitives_d3d[] =
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{
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"point",
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"line",
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"triangle"
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};
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template<class T> static inline void EmitVertex(T& out, const char* vertex, API_TYPE ApiType, bool first_vertex = false);
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template<class T> static inline void EndPrimitive(T& out, API_TYPE ApiType);
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template<class T>
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static inline void GenerateGeometryShader(T& out, u32 primitive_type, API_TYPE ApiType)
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{
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// Non-uid template parameters will write to the dummy data (=> gets optimized out)
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geometry_shader_uid_data dummy_data;
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geometry_shader_uid_data* uid_data = out.template GetUidData<geometry_shader_uid_data>();
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if (uid_data == nullptr)
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uid_data = &dummy_data;
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out.SetBuffer(text);
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const bool is_writing_shadercode = (out.GetBuffer() != nullptr);
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if (is_writing_shadercode)
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text[sizeof(text) - 1] = 0x7C; // canary
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uid_data->primitive_type = primitive_type;
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const unsigned int vertex_in = primitive_type + 1;
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unsigned int vertex_out = primitive_type == PRIMITIVE_TRIANGLES ? 3 : 4;
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uid_data->wireframe = g_ActiveConfig.bWireFrame;
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if (g_ActiveConfig.bWireFrame)
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vertex_out++;
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uid_data->stereo = g_ActiveConfig.iStereoMode > 0;
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if (ApiType == API_OPENGL)
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{
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// Insert layout parameters
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if (g_ActiveConfig.backend_info.bSupportsGSInstancing)
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{
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out.Write("layout(%s, invocations = %d) in;\n", primitives_ogl[primitive_type], g_ActiveConfig.iStereoMode > 0 ? 2 : 1);
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out.Write("layout(%s_strip, max_vertices = %d) out;\n", g_ActiveConfig.bWireFrame ? "line" : "triangle", vertex_out);
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}
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else
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{
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out.Write("layout(%s) in;\n", primitives_ogl[primitive_type]);
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out.Write("layout(%s_strip, max_vertices = %d) out;\n", g_ActiveConfig.bWireFrame ? "line" : "triangle", g_ActiveConfig.iStereoMode > 0 ? vertex_out * 2 : vertex_out);
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}
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}
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out.Write("%s", s_lighting_struct);
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// uniforms
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if (ApiType == API_OPENGL)
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out.Write("layout(std140%s) uniform GSBlock {\n", g_ActiveConfig.backend_info.bSupportsBindingLayout ? ", binding = 3" : "");
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else
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out.Write("cbuffer GSBlock {\n");
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out.Write(
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"\tfloat4 " I_STEREOPARAMS";\n"
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"\tfloat4 " I_LINEPTPARAMS";\n"
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"\tint4 " I_TEXOFFSET";\n"
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"};\n");
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uid_data->numTexGens = bpmem.genMode.numtexgens;
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uid_data->pixel_lighting = g_ActiveConfig.bEnablePixelLighting;
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out.Write("struct VS_OUTPUT {\n");
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GenerateVSOutputMembers<T>(out, ApiType);
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out.Write("};\n");
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if (ApiType == API_OPENGL)
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{
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if (g_ActiveConfig.backend_info.bSupportsGSInstancing)
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out.Write("#define InstanceID gl_InvocationID\n");
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out.Write("in VertexData {\n");
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GenerateVSOutputMembers<T>(out, ApiType, g_ActiveConfig.backend_info.bSupportsBindingLayout ? "centroid" : "centroid in");
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out.Write("} vs[%d];\n", vertex_in);
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out.Write("out VertexData {\n");
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GenerateVSOutputMembers<T>(out, ApiType, g_ActiveConfig.backend_info.bSupportsBindingLayout ? "centroid" : "centroid out");
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if (g_ActiveConfig.iStereoMode > 0)
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out.Write("\tflat int layer;\n");
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out.Write("} ps;\n");
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out.Write("void main()\n{\n");
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}
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else // D3D
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{
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out.Write("struct VertexData {\n");
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out.Write("\tVS_OUTPUT o;\n");
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if (g_ActiveConfig.iStereoMode > 0)
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out.Write("\tuint layer : SV_RenderTargetArrayIndex;\n");
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out.Write("};\n");
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if (g_ActiveConfig.backend_info.bSupportsGSInstancing)
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{
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out.Write("[maxvertexcount(%d)]\n[instance(%d)]\n", vertex_out, g_ActiveConfig.iStereoMode > 0 ? 2 : 1);
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out.Write("void main(%s VS_OUTPUT o[%d], inout %sStream<VertexData> output, in uint InstanceID : SV_GSInstanceID)\n{\n", primitives_d3d[primitive_type], vertex_in, g_ActiveConfig.bWireFrame ? "Line" : "Triangle");
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}
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else
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{
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out.Write("[maxvertexcount(%d)]\n", g_ActiveConfig.iStereoMode > 0 ? vertex_out * 2 : vertex_out);
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out.Write("void main(%s VS_OUTPUT o[%d], inout %sStream<VertexData> output)\n{\n", primitives_d3d[primitive_type], vertex_in, g_ActiveConfig.bWireFrame ? "Line" : "Triangle");
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}
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out.Write("\tVertexData ps;\n");
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}
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if (primitive_type == PRIMITIVE_LINES)
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{
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if (ApiType == API_OPENGL)
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{
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out.Write("\tVS_OUTPUT start, end;\n");
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AssignVSOutputMembers(out, "start", "vs[0]");
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AssignVSOutputMembers(out, "end", "vs[1]");
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}
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else
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{
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out.Write("\tVS_OUTPUT start = o[0];\n");
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out.Write("\tVS_OUTPUT end = o[1];\n");
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}
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// GameCube/Wii's line drawing algorithm is a little quirky. It does not
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// use the correct line caps. Instead, the line caps are vertical or
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// horizontal depending the slope of the line.
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out.Write(
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"\tfloat2 offset;\n"
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"\tfloat2 to = abs(end.pos.xy - start.pos.xy);\n"
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// FIXME: What does real hardware do when line is at a 45-degree angle?
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// FIXME: Lines aren't drawn at the correct width. See Twilight Princess map.
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"\tif (" I_LINEPTPARAMS".y * to.y > " I_LINEPTPARAMS".x * to.x) {\n"
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// Line is more tall. Extend geometry left and right.
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// Lerp LineWidth/2 from [0..VpWidth] to [-1..1]
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"\t\toffset = float2(" I_LINEPTPARAMS".z / " I_LINEPTPARAMS".x, 0);\n"
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"\t} else {\n"
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// Line is more wide. Extend geometry up and down.
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// Lerp LineWidth/2 from [0..VpHeight] to [1..-1]
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"\t\toffset = float2(0, -" I_LINEPTPARAMS".z / " I_LINEPTPARAMS".y);\n"
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"\t}\n");
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}
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else if (primitive_type == PRIMITIVE_POINTS)
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{
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if (ApiType == API_OPENGL)
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{
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out.Write("\tVS_OUTPUT center;\n");
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AssignVSOutputMembers(out, "center", "vs[0]");
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}
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else
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{
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out.Write("\tVS_OUTPUT center = o[0];\n");
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}
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// Offset from center to upper right vertex
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// Lerp PointSize/2 from [0,0..VpWidth,VpHeight] to [-1,1..1,-1]
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out.Write("\tfloat2 offset = float2(" I_LINEPTPARAMS".w / " I_LINEPTPARAMS".x, -" I_LINEPTPARAMS".w / " I_LINEPTPARAMS".y) * center.pos.w;\n");
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}
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if (g_ActiveConfig.iStereoMode > 0)
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{
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// If the GPU supports invocation we don't need a for loop and can simply use the
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// invocation identifier to determine which layer we're rendering.
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if (g_ActiveConfig.backend_info.bSupportsGSInstancing)
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out.Write("\tint eye = InstanceID;\n");
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else
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out.Write("\tfor (int eye = 0; eye < 2; ++eye) {\n");
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}
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if (g_ActiveConfig.bWireFrame)
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out.Write("\tVS_OUTPUT first;\n");
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out.Write("\tfor (int i = 0; i < %d; ++i) {\n", vertex_in);
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if (ApiType == API_OPENGL)
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{
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out.Write("\tVS_OUTPUT f;\n");
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AssignVSOutputMembers(out, "f", "vs[i]");
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}
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else
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{
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out.Write("\tVS_OUTPUT f = o[i];\n");
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}
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if (g_ActiveConfig.iStereoMode > 0)
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{
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// Select the output layer
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out.Write("\tps.layer = eye;\n");
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if (ApiType == API_OPENGL)
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out.Write("\tgl_Layer = eye;\n");
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// For stereoscopy add a small horizontal offset in Normalized Device Coordinates proportional
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// to the depth of the vertex. We retrieve the depth value from the w-component of the projected
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// vertex which contains the negated z-component of the original vertex.
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// For negative parallax (out-of-screen effects) we subtract a convergence value from
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// the depth value. This results in objects at a distance smaller than the convergence
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// distance to seemingly appear in front of the screen.
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// This formula is based on page 13 of the "Nvidia 3D Vision Automatic, Best Practices Guide"
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out.Write("\tf.pos.x += " I_STEREOPARAMS"[eye] * (f.pos.w - " I_STEREOPARAMS"[2]);\n");
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}
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if (primitive_type == PRIMITIVE_LINES)
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{
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out.Write("\tVS_OUTPUT l = f;\n"
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"\tVS_OUTPUT r = f;\n");
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out.Write("\tl.pos.xy -= offset * l.pos.w;\n"
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"\tr.pos.xy += offset * r.pos.w;\n");
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out.Write("\tif (" I_TEXOFFSET"[2] != 0) {\n");
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out.Write("\tfloat texOffset = 1.0 / float(" I_TEXOFFSET"[2]);\n");
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for (unsigned int i = 0; i < bpmem.genMode.numtexgens; ++i)
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{
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out.Write("\tif (((" I_TEXOFFSET"[0] >> %d) & 0x1) != 0)\n", i);
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out.Write("\t\tr.tex%d.x += texOffset;\n", i);
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}
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out.Write("\t}\n");
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EmitVertex<T>(out, "l", ApiType, true);
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EmitVertex<T>(out, "r", ApiType);
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}
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else if (primitive_type == PRIMITIVE_POINTS)
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{
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out.Write("\tVS_OUTPUT ll = f;\n"
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"\tVS_OUTPUT lr = f;\n"
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"\tVS_OUTPUT ul = f;\n"
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"\tVS_OUTPUT ur = f;\n");
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out.Write("\tll.pos.xy += float2(-1,-1) * offset;\n"
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"\tlr.pos.xy += float2(1,-1) * offset;\n"
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"\tul.pos.xy += float2(-1,1) * offset;\n"
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"\tur.pos.xy += offset;\n");
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out.Write("\tif (" I_TEXOFFSET"[3] != 0) {\n");
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out.Write("\tfloat2 texOffset = float2(1.0 / float(" I_TEXOFFSET"[3]), 1.0 / float(" I_TEXOFFSET"[3]));\n");
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for (unsigned int i = 0; i < bpmem.genMode.numtexgens; ++i)
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{
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out.Write("\tif (((" I_TEXOFFSET"[1] >> %d) & 0x1) != 0) {\n", i);
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out.Write("\t\tll.tex%d.xy += float2(0,1) * texOffset;\n", i);
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out.Write("\t\tlr.tex%d.xy += texOffset;\n", i);
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out.Write("\t\tur.tex%d.xy += float2(1,0) * texOffset;\n", i);
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out.Write("\t}\n");
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}
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out.Write("\t}\n");
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EmitVertex<T>(out, "ll", ApiType, true);
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EmitVertex<T>(out, "lr", ApiType);
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EmitVertex<T>(out, "ul", ApiType);
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EmitVertex<T>(out, "ur", ApiType);
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}
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else
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{
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EmitVertex<T>(out, "f", ApiType, true);
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}
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out.Write("\t}\n");
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EndPrimitive<T>(out, ApiType);
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if (g_ActiveConfig.iStereoMode > 0 && !g_ActiveConfig.backend_info.bSupportsGSInstancing)
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out.Write("\t}\n");
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out.Write("}\n");
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if (is_writing_shadercode)
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{
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if (text[sizeof(text) - 1] != 0x7C)
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PanicAlert("GeometryShader generator - buffer too small, canary has been eaten!");
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}
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}
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template<class T>
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static inline void EmitVertex(T& out, const char* vertex, API_TYPE ApiType, bool first_vertex)
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{
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if (g_ActiveConfig.bWireFrame && first_vertex)
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out.Write("\tif (i == 0) first = %s;\n", vertex);
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if (ApiType == API_OPENGL)
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{
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out.Write("\tgl_Position = %s.pos;\n", vertex);
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AssignVSOutputMembers(out, "ps", vertex);
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}
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else
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{
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out.Write("\tps.o = %s;\n", vertex);
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}
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if (ApiType == API_OPENGL)
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out.Write("\tEmitVertex();\n");
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else
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out.Write("\toutput.Append(ps);\n");
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}
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template<class T>
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static inline void EndPrimitive(T& out, API_TYPE ApiType)
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{
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if (g_ActiveConfig.bWireFrame)
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EmitVertex<T>(out, "first", ApiType);
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if (ApiType == API_OPENGL)
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out.Write("\tEndPrimitive();\n");
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else
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out.Write("\toutput.RestartStrip();\n");
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}
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void GetGeometryShaderUid(GeometryShaderUid& object, u32 primitive_type, API_TYPE ApiType)
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{
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GenerateGeometryShader<GeometryShaderUid>(object, primitive_type, ApiType);
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}
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void GenerateGeometryShaderCode(ShaderCode& object, u32 primitive_type, API_TYPE ApiType)
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{
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GenerateGeometryShader<ShaderCode>(object, primitive_type, ApiType);
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}
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