From 0a2227d1f8e634faf5e08436cba73c85fdf42afc Mon Sep 17 00:00:00 2001
From: Samuliak <samuliak77@gmail.com>
Date: Tue, 9 Apr 2024 15:23:44 +0200
Subject: [PATCH] metal: bind and sample from texture

---
 .../renderer_metal/mtl_graphics_pipeline.cpp  | 51 +++++++++++++++++++
 .../renderer_metal/mtl_pipeline_cache.cpp     |  6 ++-
 2 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/src/video_core/renderer_metal/mtl_graphics_pipeline.cpp b/src/video_core/renderer_metal/mtl_graphics_pipeline.cpp
index 626b0221a6..819e327897 100644
--- a/src/video_core/renderer_metal/mtl_graphics_pipeline.cpp
+++ b/src/video_core/renderer_metal/mtl_graphics_pipeline.cpp
@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <algorithm>
+#include <iostream>
 #include <span>
 
 #include <boost/container/small_vector.hpp>
@@ -70,6 +71,56 @@ void GraphicsPipeline::Configure(bool is_indexed) {
     command_recorder.BeginOrContinueRenderPass(framebuffer->GetHandle());
 
     command_recorder.GetRenderCommandEncoder()->setRenderPipelineState(pipeline_state);
+
+    // Bind resources
+
+    // HACK: try to find a texture that we can bind
+    size_t stage = 4;
+    // const auto& cbufs{maxwell3d->state.shader_stages[stage].const_buffers};
+    const auto read_handle{[&](const auto& desc, u32 index) {
+        /*
+        ASSERT(cbufs[desc.cbuf_index].enabled);
+        const u32 index_offset{index << desc.size_shift};
+        const u32 offset{desc.cbuf_offset + index_offset};
+        const GPUVAddr addr{cbufs[desc.cbuf_index].address + offset};
+        if constexpr (std::is_same_v<decltype(desc), const Shader::TextureDescriptor&> ||
+                      std::is_same_v<decltype(desc), const Shader::TextureBufferDescriptor&>) {
+            if (desc.has_secondary) {
+                ASSERT(cbufs[desc.secondary_cbuf_index].enabled);
+                const u32 second_offset{desc.secondary_cbuf_offset + index_offset};
+                const GPUVAddr separate_addr{cbufs[desc.secondary_cbuf_index].address +
+                                             second_offset};
+                const u32 lhs_raw{gpu_memory->Read<u32>(addr) << desc.shift_left};
+                const u32 rhs_raw{gpu_memory->Read<u32>(separate_addr)
+                                  << desc.secondary_shift_left};
+                const u32 raw{lhs_raw | rhs_raw};
+                return TexturePair(raw, false);
+            }
+        }
+        */
+        // HACK: hardcode the texture address
+        return TexturePair(/*gpu_memory->Read<u32>(addr)*/ 310378932, false);
+    }};
+
+    const Shader::Info& info{stage_infos[stage]};
+    std::array<VideoCommon::ImageViewInOut, 32> views;
+    size_t view_index{};
+    for (const auto& desc : info.texture_descriptors) {
+        for (u32 index = 0; index < desc.count; ++index) {
+            const auto handle{read_handle(desc, index)};
+            views[view_index++] = {
+                .index = handle.first,
+                .blacklist = false,
+                .id = {},
+            };
+        }
+    }
+    texture_cache.FillGraphicsImageViews<true>(std::span(views.data(), view_index));
+    VideoCommon::ImageViewInOut* texture_buffer_it{views.data()};
+
+    ImageView& image_view{texture_cache.GetImageView(texture_buffer_it->id)};
+
+    command_recorder.GetRenderCommandEncoder()->setFragmentTexture(image_view.GetHandle(), 0);
 }
 
 void GraphicsPipeline::MakePipeline(MTL::RenderPassDescriptor* render_pass) {
diff --git a/src/video_core/renderer_metal/mtl_pipeline_cache.cpp b/src/video_core/renderer_metal/mtl_pipeline_cache.cpp
index 116d44698f..2681277e12 100644
--- a/src/video_core/renderer_metal/mtl_pipeline_cache.cpp
+++ b/src/video_core/renderer_metal/mtl_pipeline_cache.cpp
@@ -298,8 +298,10 @@ std::unique_ptr<GraphicsPipeline> PipelineCache::CreateGraphicsPipeline(
             return out;
         }
 
-        fragment float4 fragmentMain(VertexOut in [[stage_in]]) {
-            return float4(in.texCoord, 0.0, 1.0);
+        fragment float4 fragmentMain(VertexOut in [[stage_in]], texture2d<float> tex [[texture(0)]]) {
+            constexpr sampler samplr(mip_filter::linear, mag_filter::linear, min_filter::linear);
+
+            return tex.sample(samplr, in.texCoord);
         }
     )",
                                                                NS::ASCIIStringEncoding),