131 lines
4.2 KiB
C++
131 lines
4.2 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 <locale.h>
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#ifdef __APPLE__
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#include <xlocale.h>
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#endif
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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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template<class T>
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static inline void GenerateGeometryShader(T& out, u32 components, 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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#ifndef ANDROID
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locale_t locale;
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locale_t old_locale;
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if (is_writing_shadercode)
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{
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locale = newlocale(LC_NUMERIC_MASK, "C", nullptr); // New locale for compilation
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old_locale = uselocale(locale); // Apply the locale for this thread
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}
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#endif
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if (is_writing_shadercode)
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text[sizeof(text) - 1] = 0x7C; // canary
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out.Write("//Geometry Shader for 3D stereoscopy\n");
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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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out.Write("layout(triangles, invocations = %d) in;\n", g_ActiveConfig.iStereoMode > 0 ? 2 : 1);
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else
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out.Write("layout(triangles) in;\n");
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out.Write("layout(triangle_strip, max_vertices = %d) out;\n", g_ActiveConfig.backend_info.bSupportsGSInstancing ? 3 : 6);
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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 VSBlock {\n", g_ActiveConfig.backend_info.bSupportsBindingLayout ? ", binding = 2" : "");
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else
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out.Write("cbuffer VSBlock {\n");
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out.Write(s_shader_uniforms);
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out.Write("};\n");
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GenerateVSOutputStruct(out, ApiType);
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out.Write("centroid in VS_OUTPUT o[3];\n");
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out.Write("centroid out VS_OUTPUT f;\n");
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out.Write("flat out int layer;\n");
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out.Write("void main()\n{\n");
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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("\tlayer = gl_InvocationID;\n");
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else
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out.Write("\tfor (layer = 0; layer < %d; ++layer) {\n", g_ActiveConfig.iStereoMode > 0 ? 2 : 1);
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// Select the output layer
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out.Write("\tgl_Layer = layer;\n");
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out.Write("\tfor (int i = 0; i < gl_in.length(); ++i) {\n");
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out.Write("\t\tf = o[i];\n");
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if (g_ActiveConfig.iStereoMode > 0)
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{
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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("\t\tf.clipPos.x += " I_STEREOPARAMS"[layer] * (f.clipPos.w - " I_STEREOPARAMS"[2]);\n");
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out.Write("\t\tf.pos.x += " I_STEREOPARAMS"[layer] * (f.pos.w - " I_STEREOPARAMS"[2]);\n");
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}
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out.Write("\t\tgl_Position = f.pos;\n");
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out.Write("\t\tEmitVertex();\n");
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out.Write("\t}\n");
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out.Write("\tEndPrimitive();\n");
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if (!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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#ifndef ANDROID
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uselocale(old_locale); // restore locale
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freelocale(locale);
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#endif
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}
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}
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void GetGeometryShaderUid(GeometryShaderUid& object, u32 components, API_TYPE ApiType)
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{
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GenerateGeometryShader<GeometryShaderUid>(object, components, ApiType);
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}
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void GenerateGeometryShaderCode(ShaderCode& object, u32 components, API_TYPE ApiType)
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{
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GenerateGeometryShader<ShaderCode>(object, components, ApiType);
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}
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