Revert the Metal Experiment (#701)

Metal sounded like a good idea to get in the emulator but frankly I
underestimated just how experimental and not ready it was.
From my write up in the Discord:
```
As is, Metal supports only a few games.
The games it does support freeze on first use of not playing them via Vulkan, because shader translation is broken.
So you need to use a dirty hack to not delete all your shaders.
Not to mention it breaks many games via MoltenVK because of changes to the shared GPU code.

Merging Metal seemed like a great idea, because of the few games it does support.
But I don't think it's worth it. Many of the games it breaks via MoltenVK *don't work via Metal*. 
Which effectively makes current Ryubing worse for Mac users than Ryujinx 1.1.1403.

I think what I'm gonna do is revert Metal, and reopen it as a PR. That way, you can still take advantage of the Metal backend as is, but without making other games worse with no solution.
```

For what it's worth, the shader translation part could at least be
"fixed" by always applying a 30ms delay for shader translation to Metal.
That being said, that solution sucks ass.
The MoltenVK regressions are even worse.



I hope this is not a let down to the Mac users. I hope you realize I'm
reverting this because you're actively getting a worse experience with
it in the emulator.

src/Ryujinx.Graphics.Metal/Shaders/Blit.metal

@@ -1,43 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct CopyVertexOut {
-    float4 position [[position]];
-    float2 uv;
-};
-
-struct TexCoords {
-    float data[4];
-};
-
-struct ConstantBuffers {
-    constant TexCoords* tex_coord;
-};
-
-struct Textures
-{
-    texture2d<FORMAT, access::sample> texture;
-    sampler sampler;
-};
-
-vertex CopyVertexOut vertexMain(uint vid [[vertex_id]],
-                                constant ConstantBuffers &constant_buffers [[buffer(CONSTANT_BUFFERS_INDEX)]]) {
-    CopyVertexOut out;
-
-    int low = vid & 1;
-    int high = vid >> 1;
-    out.uv.x = constant_buffers.tex_coord->data[low];
-    out.uv.y = constant_buffers.tex_coord->data[2 + high];
-    out.position.x = (float(low) - 0.5f) * 2.0f;
-    out.position.y = (float(high) - 0.5f) * 2.0f;
-    out.position.z = 0.0f;
-    out.position.w = 1.0f;
-
-    return out;
-}
-
-fragment FORMAT4 fragmentMain(CopyVertexOut in [[stage_in]],
-                             constant Textures &textures [[buffer(TEXTURES_INDEX)]]) {
-    return textures.texture.sample(textures.sampler, in.uv);
-}

src/Ryujinx.Graphics.Metal/Shaders/BlitMs.metal

@@ -1,45 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct CopyVertexOut {
-    float4 position [[position]];
-    float2 uv;
-};
-
-struct TexCoords {
-    float data[4];
-};
-
-struct ConstantBuffers {
-    constant TexCoords* tex_coord;
-};
-
-struct Textures
-{
-    texture2d_ms<FORMAT, access::read> texture;
-};
-
-vertex CopyVertexOut vertexMain(uint vid [[vertex_id]],
-                                constant ConstantBuffers &constant_buffers [[buffer(CONSTANT_BUFFERS_INDEX)]]) {
-    CopyVertexOut out;
-
-    int low = vid & 1;
-    int high = vid >> 1;
-    out.uv.x = constant_buffers.tex_coord->data[low];
-    out.uv.y = constant_buffers.tex_coord->data[2 + high];
-    out.position.x = (float(low) - 0.5f) * 2.0f;
-    out.position.y = (float(high) - 0.5f) * 2.0f;
-    out.position.z = 0.0f;
-    out.position.w = 1.0f;
-
-    return out;
-}
-
-fragment FORMAT4 fragmentMain(CopyVertexOut in [[stage_in]],
-                             constant Textures &textures [[buffer(TEXTURES_INDEX)]],
-                             uint sample_id [[sample_id]]) {
-    uint2 tex_size = uint2(textures.texture.get_width(), textures.texture.get_height());
-    uint2 tex_coord = uint2(in.uv * float2(tex_size));
-    return textures.texture.read(tex_coord, sample_id);
-}

src/Ryujinx.Graphics.Metal/Shaders/ChangeBufferStride.metal

@@ -1,72 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct StrideArguments {
-    int4 data;
-};
-
-struct InData {
-    uint8_t data[1];
-};
-
-struct OutData {
-    uint8_t data[1];
-};
-
-struct ConstantBuffers {
-    constant StrideArguments* stride_arguments;
-};
-
-struct StorageBuffers {
-    device InData* in_data;
-    device OutData* out_data;
-};
-
-kernel void kernelMain(constant ConstantBuffers &constant_buffers [[buffer(CONSTANT_BUFFERS_INDEX)]],
-                       device StorageBuffers &storage_buffers [[buffer(STORAGE_BUFFERS_INDEX)]],
-                       uint3 thread_position_in_grid [[thread_position_in_grid]],
-                       uint3 threads_per_threadgroup [[threads_per_threadgroup]],
-                       uint3 threadgroups_per_grid [[threadgroups_per_grid]])
-{
-    // Determine what slice of the stride copies this invocation will perform.
-
-    int sourceStride = constant_buffers.stride_arguments->data.x;
-    int targetStride = constant_buffers.stride_arguments->data.y;
-    int bufferSize = constant_buffers.stride_arguments->data.z;
-    int sourceOffset = constant_buffers.stride_arguments->data.w;
-
-    int strideRemainder = targetStride - sourceStride;
-    int invocations = int(threads_per_threadgroup.x * threadgroups_per_grid.x);
-
-    int copiesRequired = bufferSize / sourceStride;
-
-    // Find the copies that this invocation should perform.
-
-    // - Copies that all invocations perform.
-    int allInvocationCopies = copiesRequired / invocations;
-
-    // - Extra remainder copy that this invocation performs.
-    int index = int(thread_position_in_grid.x);
-    int extra = (index < (copiesRequired % invocations)) ? 1 : 0;
-
-    int copyCount = allInvocationCopies + extra;
-
-    // Finally, get the starting offset. Make sure to count extra copies.
-
-    int startCopy = allInvocationCopies * index + min(copiesRequired % invocations, index);
-
-    int srcOffset = sourceOffset + startCopy * sourceStride;
-    int dstOffset = startCopy * targetStride;
-
-    // Perform the copies for this region
-    for (int i = 0; i < copyCount; i++) {
-        for (int j = 0; j < sourceStride; j++) {
-            storage_buffers.out_data->data[dstOffset++] = storage_buffers.in_data->data[srcOffset++];
-        }
-
-        for (int j = 0; j < strideRemainder; j++) {
-            storage_buffers.out_data->data[dstOffset++] = uint8_t(0);
-        }
-    }
-}

src/Ryujinx.Graphics.Metal/Shaders/ColorClear.metal

@@ -1,38 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct VertexOut {
-    float4 position [[position]];
-};
-
-struct ClearColor {
-    FORMAT4 data;
-};
-
-struct ConstantBuffers {
-    constant ClearColor* clear_color;
-};
-
-vertex VertexOut vertexMain(ushort vid [[vertex_id]]) {
-    int low = vid & 1;
-    int high = vid >> 1;
-
-    VertexOut out;
-
-    out.position.x = (float(low) - 0.5f) * 2.0f;
-    out.position.y = (float(high) - 0.5f) * 2.0f;
-    out.position.z = 0.0f;
-    out.position.w = 1.0f;
-
-    return out;
-}
-
-struct FragmentOut {
-    FORMAT4 color [[color(COLOR_ATTACHMENT_INDEX)]];
-};
-
-fragment FragmentOut fragmentMain(VertexOut in [[stage_in]],
-                                  constant ConstantBuffers &constant_buffers [[buffer(CONSTANT_BUFFERS_INDEX)]]) {
-    return {constant_buffers.clear_color->data};
-}

src/Ryujinx.Graphics.Metal/Shaders/ConvertD32S8ToD24S8.metal

@@ -1,66 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct StrideArguments {
-    int pixelCount;
-    int dstStartOffset;
-};
-
-struct InData {
-    uint data[1];
-};
-
-struct OutData {
-    uint data[1];
-};
-
-struct ConstantBuffers {
-    constant StrideArguments* stride_arguments;
-};
-
-struct StorageBuffers {
-    device InData* in_data;
-    device OutData* out_data;
-};
-
-kernel void kernelMain(constant ConstantBuffers &constant_buffers [[buffer(CONSTANT_BUFFERS_INDEX)]],
-                       device StorageBuffers &storage_buffers [[buffer(STORAGE_BUFFERS_INDEX)]],
-                       uint3 thread_position_in_grid [[thread_position_in_grid]],
-                       uint3 threads_per_threadgroup [[threads_per_threadgroup]],
-                       uint3 threadgroups_per_grid [[threadgroups_per_grid]])
-{
-    // Determine what slice of the stride copies this invocation will perform.
-    int invocations = int(threads_per_threadgroup.x * threadgroups_per_grid.x);
-
-    int copiesRequired = constant_buffers.stride_arguments->pixelCount;
-
-    // Find the copies that this invocation should perform.
-
-    // - Copies that all invocations perform.
-    int allInvocationCopies = copiesRequired / invocations;
-
-    // - Extra remainder copy that this invocation performs.
-    int index = int(thread_position_in_grid.x);
-    int extra = (index < (copiesRequired % invocations)) ? 1 : 0;
-
-    int copyCount = allInvocationCopies + extra;
-
-    // Finally, get the starting offset. Make sure to count extra copies.
-
-    int startCopy = allInvocationCopies * index + min(copiesRequired % invocations, index);
-
-    int srcOffset = startCopy * 2;
-    int dstOffset = constant_buffers.stride_arguments->dstStartOffset + startCopy;
-
-    // Perform the conversion for this region.
-    for (int i = 0; i < copyCount; i++)
-    {
-        float depth = as_type<float>(storage_buffers.in_data->data[srcOffset++]);
-        uint stencil = storage_buffers.in_data->data[srcOffset++];
-
-        uint rescaledDepth = uint(clamp(depth, 0.0, 1.0) * 16777215.0);
-
-        storage_buffers.out_data->data[dstOffset++] = (rescaledDepth << 8) | (stencil & 0xff);
-    }
-}

src/Ryujinx.Graphics.Metal/Shaders/ConvertIndexBuffer.metal

@@ -1,59 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct IndexBufferPattern {
-    int pattern[8];
-    int primitiveVertices;
-    int primitiveVerticesOut;
-    int indexSize;
-    int indexSizeOut;
-    int baseIndex;
-    int indexStride;
-    int srcOffset;
-    int totalPrimitives;
-};
-
-struct InData {
-    uint8_t data[1];
-};
-
-struct OutData {
-    uint8_t data[1];
-};
-
-struct StorageBuffers {
-    device InData* in_data;
-    device OutData* out_data;
-    constant IndexBufferPattern* index_buffer_pattern;
-};
-
-kernel void kernelMain(device StorageBuffers &storage_buffers [[buffer(STORAGE_BUFFERS_INDEX)]],
-                       uint3 thread_position_in_grid [[thread_position_in_grid]])
-{
-    int primitiveIndex = int(thread_position_in_grid.x);
-    if (primitiveIndex >= storage_buffers.index_buffer_pattern->totalPrimitives)
-    {
-        return;
-    }
-
-    int inOffset = primitiveIndex * storage_buffers.index_buffer_pattern->indexStride;
-    int outOffset = primitiveIndex * storage_buffers.index_buffer_pattern->primitiveVerticesOut;
-
-    for (int i = 0; i < storage_buffers.index_buffer_pattern->primitiveVerticesOut; i++)
-    {
-        int j;
-        int io = max(0, inOffset + storage_buffers.index_buffer_pattern->baseIndex + storage_buffers.index_buffer_pattern->pattern[i]) * storage_buffers.index_buffer_pattern->indexSize;
-        int oo = (outOffset + i) * storage_buffers.index_buffer_pattern->indexSizeOut;
-
-        for (j = 0; j < storage_buffers.index_buffer_pattern->indexSize; j++)
-        {
-            storage_buffers.out_data->data[oo + j] = storage_buffers.in_data->data[storage_buffers.index_buffer_pattern->srcOffset + io + j];
-        }
-
-        for(; j < storage_buffers.index_buffer_pattern->indexSizeOut; j++)
-        {
-            storage_buffers.out_data->data[oo + j] = uint8_t(0);
-        }
-    }
-}

src/Ryujinx.Graphics.Metal/Shaders/DepthBlit.metal

@@ -1,27 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct CopyVertexOut {
-    float4 position [[position]];
-    float2 uv;
-};
-
-struct Textures
-{
-    texture2d<float, access::sample> texture;
-    sampler sampler;
-};
-
-struct FragmentOut {
-    float depth [[depth(any)]];
-};
-
-fragment FragmentOut fragmentMain(CopyVertexOut in [[stage_in]],
-                             constant Textures &textures [[buffer(TEXTURES_INDEX)]]) {
-    FragmentOut out;
-
-    out.depth = textures.texture.sample(textures.sampler, in.uv).r;
-
-    return out;
-}

src/Ryujinx.Graphics.Metal/Shaders/DepthBlitMs.metal

@@ -1,29 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct CopyVertexOut {
-    float4 position [[position]];
-    float2 uv;
-};
-
-struct Textures
-{
-    texture2d_ms<float, access::read> texture;
-};
-
-struct FragmentOut {
-    float depth [[depth(any)]];
-};
-
-fragment FragmentOut fragmentMain(CopyVertexOut in [[stage_in]],
-                             constant Textures &textures [[buffer(TEXTURES_INDEX)]],
-                             uint sample_id [[sample_id]]) {
-    FragmentOut out;
-
-    uint2 tex_size = uint2(textures.texture.get_width(), textures.texture.get_height());
-    uint2 tex_coord = uint2(in.uv * float2(tex_size));
-    out.depth = textures.texture.read(tex_coord, sample_id).r;
-
-    return out;
-}

src/Ryujinx.Graphics.Metal/Shaders/DepthStencilClear.metal

@@ -1,42 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct VertexOut {
-    float4 position [[position]];
-};
-
-struct FragmentOut {
-    float depth [[depth(any)]];
-};
-
-struct ClearDepth {
-    float data;
-};
-
-struct ConstantBuffers {
-    constant ClearDepth* clear_depth;
-};
-
-vertex VertexOut vertexMain(ushort vid [[vertex_id]]) {
-    int low = vid & 1;
-    int high = vid >> 1;
-
-    VertexOut out;
-
-    out.position.x = (float(low) - 0.5f) * 2.0f;
-    out.position.y = (float(high) - 0.5f) * 2.0f;
-    out.position.z = 0.0f;
-    out.position.w = 1.0f;
-
-    return out;
-}
-
-fragment FragmentOut fragmentMain(VertexOut in [[stage_in]],
-                                  constant ConstantBuffers &constant_buffers [[buffer(CONSTANT_BUFFERS_INDEX)]]) {
-    FragmentOut out;
-
-    out.depth = constant_buffers.clear_depth->data;
-
-    return out;
-}

src/Ryujinx.Graphics.Metal/Shaders/StencilBlit.metal

@@ -1,27 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct CopyVertexOut {
-    float4 position [[position]];
-    float2 uv;
-};
-
-struct Textures
-{
-    texture2d<uint, access::sample> texture;
-    sampler sampler;
-};
-
-struct FragmentOut {
-    uint stencil [[stencil]];
-};
-
-fragment FragmentOut fragmentMain(CopyVertexOut in [[stage_in]],
-                             constant Textures &textures [[buffer(TEXTURES_INDEX)]]) {
-    FragmentOut out;
-
-    out.stencil = textures.texture.sample(textures.sampler, in.uv).r;
-
-    return out;
-}

src/Ryujinx.Graphics.Metal/Shaders/StencilBlitMs.metal

@@ -1,29 +0,0 @@
-#include <metal_stdlib>
-
-using namespace metal;
-
-struct CopyVertexOut {
-    float4 position [[position]];
-    float2 uv;
-};
-
-struct Textures
-{
-    texture2d_ms<uint, access::read> texture;
-};
-
-struct FragmentOut {
-    uint stencil [[stencil]];
-};
-
-fragment FragmentOut fragmentMain(CopyVertexOut in [[stage_in]],
-                             constant Textures &textures [[buffer(TEXTURES_INDEX)]],
-                             uint sample_id [[sample_id]]) {
-    FragmentOut out;
-
-    uint2 tex_size = uint2(textures.texture.get_width(), textures.texture.get_height());
-    uint2 tex_coord = uint2(in.uv * float2(tex_size));
-    out.stencil = textures.texture.read(tex_coord, sample_id).r;
-
-    return out;
-}