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//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor
// and its affiliates, except as required to comply with Section 4(c) of
// the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#include "mtlHud.h"
#include "font_image.h"
#include "simple_math.h"
#include <Metal/Metal.h>
static const char* shaderSource = R"(
#include <metal_stdlib>
using namespace metal;
struct VertexInput {
float2 position [[attribute(0)]];
float3 color [[attribute(1)]];
float2 uv [[attribute(2)]];
};
struct VertexOutput {
float4 position [[position]];
float4 color;
float2 uv;
};
vertex VertexOutput fg_vertex(
VertexInput in [[stage_in]],
constant const float4x4& ModelViewProjectionMatrix [[buffer(1)]],
constant const float& UIScale [[buffer(2)]]
) {
VertexOutput out;
out.position = ModelViewProjectionMatrix * float4(in.position * UIScale, 0, 1);
out.color = float4(in.color, 1);
out.uv = in.uv;
return out;
}
fragment float4 fg_fragment(
VertexOutput in [[stage_in]],
texture2d<float, access::sample> fontTexture [[texture(0)]]
) {
constexpr sampler s = sampler(coord::normalized, address::clamp_to_zero, filter::nearest);
auto c = fontTexture.sample(s, in.uv);
if(c.a == 0)
discard_fragment();
return c * in.color;
}
constant float4 bgVertices[] = {
{-1, 1, 0, 1},
{1, 1, 0, 1},
{-1, -1, 0, 1},
{1, -1, 0, 1}
};
vertex VertexOutput bg_vertex(uint vertex_id [[vertex_id]]) {
VertexOutput out;
out.position = bgVertices[vertex_id];
out.uv = bgVertices[vertex_id].xy * 0.5 + 0.5 * 3.14159;
return out;
}
fragment float4 bg_fragment(VertexOutput in [[stage_in]]) {
return float4(float3(mix(0.1, 0.5, sin(in.uv.y))), 1);
}
)";
MTLhud::MTLhud() {
}
MTLhud::~MTLhud() {
}
void
MTLhud::Init(id<MTLDevice> device, MTLRenderPipelineDescriptor* parentPipelineDescriptor, MTLDepthStencilDescriptor* depthStencilStateDescriptor, int width, int height, int framebufferWidth, int framebufferHeight) {
Hud::Init(width, height, framebufferWidth, framebufferHeight);
@autoreleasepool {
_device = device;
const auto textureDescriptor = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm width:FONT_TEXTURE_WIDTH height:FONT_TEXTURE_HEIGHT mipmapped:false];
_fontTexture = [_device newTextureWithDescriptor:textureDescriptor];
[_fontTexture replaceRegion: { {0, 0, 0}, {FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT, 1} } mipmapLevel:0 withBytes:font_image bytesPerRow:4 * FONT_TEXTURE_WIDTH];
NSError* err = nil;
const auto library = [_device newLibraryWithSource:@(shaderSource) options:nil error:&err];
assert(err == nil);
const auto renderPipelineDescriptor = (MTLRenderPipelineDescriptor*)[parentPipelineDescriptor copy];
renderPipelineDescriptor.vertexFunction = [library newFunctionWithName:@"bg_vertex"];
renderPipelineDescriptor.fragmentFunction = [library newFunctionWithName:@"bg_fragment"];
_bgPipelineState = [_device newRenderPipelineStateWithDescriptor:renderPipelineDescriptor error:&err];
renderPipelineDescriptor.vertexFunction = [library newFunctionWithName:@"fg_vertex"];
renderPipelineDescriptor.fragmentFunction = [library newFunctionWithName:@"fg_fragment"];
const auto vertexDescriptor = renderPipelineDescriptor.vertexDescriptor;
vertexDescriptor.layouts[0].stride = sizeof(float) * 7;
vertexDescriptor.layouts[0].stepFunction = MTLVertexStepFunctionPerVertex;
vertexDescriptor.layouts[0].stepRate = 1;
vertexDescriptor.attributes[0].offset = 0;
vertexDescriptor.attributes[0].format = MTLVertexFormatFloat2;
vertexDescriptor.attributes[0].bufferIndex = 0;
vertexDescriptor.attributes[1].offset = sizeof(float) * 2;
vertexDescriptor.attributes[1].format = MTLVertexFormatFloat3;
vertexDescriptor.attributes[1].bufferIndex = 0;
vertexDescriptor.attributes[2].offset = sizeof(float) * 5;
vertexDescriptor.attributes[2].format = MTLVertexFormatFloat2;
vertexDescriptor.attributes[2].bufferIndex = 0;
_fgPipelineState = [_device newRenderPipelineStateWithDescriptor:renderPipelineDescriptor error:&err];
_depthStencilState = [_device newDepthStencilStateWithDescriptor:depthStencilStateDescriptor];
}
}
void
MTLhud::Rebuild(int width, int height, int framebufferWidth, int framebufferHeight) {
Hud::Rebuild(width, height, framebufferWidth, framebufferHeight);
_staticBuffer.alloc(_device, getStaticVboSource().size(), @"MTLhud static buffer");
std::copy(getStaticVboSource().begin(), getStaticVboSource().end(), _staticBuffer.data());
_staticBuffer.markModified();
}
bool
MTLhud::Flush(id<MTLRenderCommandEncoder> encoder) {
if(!Hud::Flush())
return false;
if(_dynamicBuffer.buffer().length < sizeof(float) * getVboSource().size()) {
_dynamicBuffer.alloc(_device, getVboSource().size(), @"MTLhud dynamic buffer");
} else {
_dynamicBuffer.next();
}
std::copy(getVboSource().begin(), getVboSource().end(), _dynamicBuffer.data());
_dynamicBuffer.markModified();
const auto numVertices = getVboSource().size() / 7;
getVboSource().clear();
float proj[16];
ortho(proj, 0, 0, float(GetWidth()), float(GetHeight()));
[encoder setVertexBuffer: _dynamicBuffer.buffer() offset:0 atIndex:0];
[encoder setRenderPipelineState: _fgPipelineState];
[encoder setDepthStencilState: _depthStencilState];
[encoder setVertexBytes: proj length: sizeof(proj) atIndex:1];
[encoder setVertexBytes: &UIScale length:sizeof(UIScale) atIndex:2];
[encoder setFragmentTexture: _fontTexture atIndex:0];
if(numVertices > 0) {
[encoder setVertexBuffer:_dynamicBuffer.buffer() offset:0 atIndex:0];
[encoder drawPrimitives: MTLPrimitiveTypeTriangle vertexStart:0 vertexCount: numVertices];
}
auto numStaticVertices = [_staticBuffer.buffer() length] / (7 * sizeof(float));
if(numStaticVertices > 0) {
[encoder setVertexBuffer:_staticBuffer.buffer() offset:0 atIndex:0];
[encoder drawPrimitives: MTLPrimitiveTypeTriangle vertexStart:0 vertexCount: numStaticVertices];
}
return true;
}
void
MTLhud::FillBackground(id<MTLRenderCommandEncoder> encoder) {
[encoder setRenderPipelineState: _bgPipelineState];
[encoder setDepthStencilState: _depthStencilState];
[encoder drawPrimitives: MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount: 4];
}
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