From fd85fc35f798c09d9df4a1f31d02c8497e93b5be Mon Sep 17 00:00:00 2001
From: Mirko Covizzi <mrkcvzz@gmail.com>
Date: Tue, 24 Dec 2024 15:37:00 +0100
Subject: [PATCH] Examples: ComputeSpriteBatch: add uniform buffer

Adds a uniform buffer to the compute SpriteBatch
example to showcase how to use uniform buffers
together with storage buffers.

Signed-off-by: Mirko Covizzi <mrkcvzz@gmail.com>
---
 .../Compiled/DXIL/SpriteBatch.comp.dxil       | Bin 3708 -> 4096 bytes
 .../Shaders/Compiled/MSL/SpriteBatch.comp.msl |  48 ++++++++++--------
 .../Compiled/SPIRV/SpriteBatch.comp.spv       | Bin 2884 -> 3140 bytes
 Content/Shaders/Source/SpriteBatch.comp.hlsl  |  14 +++--
 Examples/ComputeSpriteBatch.c                 |   7 ++-
 5 files changed, 43 insertions(+), 26 deletions(-)

diff --git a/Content/Shaders/Compiled/DXIL/SpriteBatch.comp.dxil b/Content/Shaders/Compiled/DXIL/SpriteBatch.comp.dxil
index a787535797e216e5a1021093de8bc0c88743af47..285804d6adc3868c188f01e8426e530503b34f8d 100644
GIT binary patch
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diff --git a/Content/Shaders/Compiled/MSL/SpriteBatch.comp.msl b/Content/Shaders/Compiled/MSL/SpriteBatch.comp.msl
index a033b5b..d02192a 100644
--- a/Content/Shaders/Compiled/MSL/SpriteBatch.comp.msl
+++ b/Content/Shaders/Compiled/MSL/SpriteBatch.comp.msl
@@ -3,6 +3,11 @@
 
 using namespace metal;
 
+struct type_UBO
+{
+    float time;
+};
+
 struct SpriteComputeData
 {
     packed_float3 position;
@@ -28,27 +33,28 @@ struct type_RWStructuredBuffer_SpriteVertex
     SpriteVertex _m0[1];
 };
 
-kernel void main0(const device type_StructuredBuffer_SpriteComputeData& ComputeBuffer [[buffer(0)]], device type_RWStructuredBuffer_SpriteVertex& VertexBuffer [[buffer(1)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]])
+kernel void main0(constant type_UBO& UBO [[buffer(0)]], const device type_StructuredBuffer_SpriteComputeData& ComputeBuffer [[buffer(1)]], device type_RWStructuredBuffer_SpriteVertex& VertexBuffer [[buffer(2)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]])
 {
-    SpriteComputeData _52 = ComputeBuffer._m0[gl_GlobalInvocationID.x];
-    float _62 = cos(_52.rotation);
-    float _63 = sin(_52.rotation);
-    float4x4 _74 = (float4x4(float4(1.0, 0.0, 0.0, 0.0), float4(0.0, 1.0, 0.0, 0.0), float4(0.0, 0.0, 1.0, 0.0), float4(_52.position[0], _52.position[1], _52.position[2], 1.0)) * float4x4(float4(_62, _63, 0.0, 0.0), float4(-_63, _62, 0.0, 0.0), float4(0.0, 0.0, 1.0, 0.0), float4(0.0, 0.0, 0.0, 1.0))) * float4x4(float4(_52.scale.x, 0.0, 0.0, 0.0), float4(0.0, _52.scale.y, 0.0, 0.0), float4(0.0, 0.0, 1.0, 0.0), float4(0.0, 0.0, 0.0, 1.0));
-    uint _76 = gl_GlobalInvocationID.x * 4u;
-    VertexBuffer._m0[_76].position = _74 * float4(0.0, 0.0, 0.0, 1.0);
-    uint _79 = _76 + 1u;
-    VertexBuffer._m0[_79].position = _74 * float4(1.0, 0.0, 0.0, 1.0);
-    uint _82 = _76 + 2u;
-    VertexBuffer._m0[_82].position = _74 * float4(0.0, 1.0, 0.0, 1.0);
-    uint _85 = _76 + 3u;
-    VertexBuffer._m0[_85].position = _74 * float4(1.0, 1.0, 0.0, 1.0);
-    VertexBuffer._m0[_76].texcoord = float2(0.0);
-    VertexBuffer._m0[_79].texcoord = float2(1.0, 0.0);
-    VertexBuffer._m0[_82].texcoord = float2(0.0, 1.0);
-    VertexBuffer._m0[_85].texcoord = float2(1.0);
-    VertexBuffer._m0[_76].color = _52.color;
-    VertexBuffer._m0[_79].color = _52.color;
-    VertexBuffer._m0[_82].color = _52.color;
-    VertexBuffer._m0[_85].color = _52.color;
+    SpriteComputeData _56 = ComputeBuffer._m0[gl_GlobalInvocationID.x];
+    float _66 = cos(_56.rotation);
+    float _67 = sin(_56.rotation);
+    float4x4 _78 = (float4x4(float4(1.0, 0.0, 0.0, 0.0), float4(0.0, 1.0, 0.0, 0.0), float4(0.0, 0.0, 1.0, 0.0), float4(_56.position[0], _56.position[1], _56.position[2], 1.0)) * float4x4(float4(_66, _67, 0.0, 0.0), float4(-_67, _66, 0.0, 0.0), float4(0.0, 0.0, 1.0, 0.0), float4(0.0, 0.0, 0.0, 1.0))) * float4x4(float4(_56.scale.x, 0.0, 0.0, 0.0), float4(0.0, _56.scale.y, 0.0, 0.0), float4(0.0, 0.0, 1.0, 0.0), float4(0.0, 0.0, 0.0, 1.0));
+    uint _80 = gl_GlobalInvocationID.x * 4u;
+    VertexBuffer._m0[_80].position = _78 * float4(0.0, 0.0, 0.0, 1.0);
+    uint _83 = _80 + 1u;
+    VertexBuffer._m0[_83].position = _78 * float4(1.0, 0.0, 0.0, 1.0);
+    uint _86 = _80 + 2u;
+    VertexBuffer._m0[_86].position = _78 * float4(0.0, 1.0, 0.0, 1.0);
+    uint _89 = _80 + 3u;
+    VertexBuffer._m0[_89].position = _78 * float4(1.0, 1.0, 0.0, 1.0);
+    VertexBuffer._m0[_80].texcoord = float2(0.0);
+    VertexBuffer._m0[_83].texcoord = float2(1.0, 0.0);
+    VertexBuffer._m0[_86].texcoord = float2(0.0, 1.0);
+    VertexBuffer._m0[_89].texcoord = float2(1.0);
+    float4 _98 = _56.color * sin(UBO.time);
+    VertexBuffer._m0[_80].color = _98;
+    VertexBuffer._m0[_83].color = _98;
+    VertexBuffer._m0[_86].color = _98;
+    VertexBuffer._m0[_89].color = _98;
 }
 
diff --git a/Content/Shaders/Compiled/SPIRV/SpriteBatch.comp.spv b/Content/Shaders/Compiled/SPIRV/SpriteBatch.comp.spv
index 2924b625aeef83d68a26750a396d5419b13b06f3..c540c02ac7167a5019926a5f9a886ebcfb373292 100644
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diff --git a/Content/Shaders/Source/SpriteBatch.comp.hlsl b/Content/Shaders/Source/SpriteBatch.comp.hlsl
index 9c70d49..42c56b5 100644
--- a/Content/Shaders/Source/SpriteBatch.comp.hlsl
+++ b/Content/Shaders/Source/SpriteBatch.comp.hlsl
@@ -13,6 +13,11 @@ struct SpriteVertex
     float4 color;
 };
 
+cbuffer UBO : register(b0, space2)
+{
+    float time : packoffset(c0);
+};
+
 StructuredBuffer<SpriteComputeData> ComputeBuffer : register(t0, space0);
 RWStructuredBuffer<SpriteVertex> VertexBuffer : register(u0, space1);
 
@@ -64,8 +69,9 @@ void main(uint3 GlobalInvocationID : SV_DispatchThreadID)
     VertexBuffer[n * 4u + 2].texcoord = float2(0.0f, 1.0f);
     VertexBuffer[n * 4u + 3].texcoord = float2(1.0f, 1.0f);
 
-    VertexBuffer[n * 4u]    .color = currentSpriteData.color;
-    VertexBuffer[n * 4u + 1].color = currentSpriteData.color;
-    VertexBuffer[n * 4u + 2].color = currentSpriteData.color;
-    VertexBuffer[n * 4u + 3].color = currentSpriteData.color;
+    float st = sin(time);
+    VertexBuffer[n * 4u]    .color = currentSpriteData.color * st;
+    VertexBuffer[n * 4u + 1].color = currentSpriteData.color * st;
+    VertexBuffer[n * 4u + 2].color = currentSpriteData.color * st;
+    VertexBuffer[n * 4u + 3].color = currentSpriteData.color * st;
 }
diff --git a/Examples/ComputeSpriteBatch.c b/Examples/ComputeSpriteBatch.c
index d204a35..9d0d171 100644
--- a/Examples/ComputeSpriteBatch.c
+++ b/Examples/ComputeSpriteBatch.c
@@ -25,7 +25,9 @@ typedef struct ComputeSpriteInstance
 	float r, g, b, a;
 } ComputeSpriteInstance;
 
-const Uint32 SPRITE_COUNT = 8192;
+const Uint32 SPRITE_COUNT = 819200;
+
+static float t;
 
 static int Init(Context* context)
 {
@@ -131,6 +133,7 @@ static int Init(Context* context)
 		&(SDL_GPUComputePipelineCreateInfo){
 			.num_readonly_storage_buffers = 1,
 			.num_readwrite_storage_buffers = 1,
+			.num_uniform_buffers = 1,
 			.threadcount_x = 64,
 			.threadcount_y = 1,
 			.threadcount_z = 1
@@ -292,6 +295,7 @@ static int Init(Context* context)
 
 static int Update(Context* context)
 {
+	t += 0.1f;
 	return 0;
 }
 
@@ -383,6 +387,7 @@ static int Draw(Context* context)
 			},
 			1
 		);
+		SDL_PushGPUComputeUniformData(cmdBuf, 0, &t, sizeof(float));
 		SDL_DispatchGPUCompute(computePass, SPRITE_COUNT / 64, 1, 1);
 
 		SDL_EndGPUComputePass(computePass);