48 lines
1.9 KiB
Plaintext
Executable File
48 lines
1.9 KiB
Plaintext
Executable File
// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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// This shader is a workaround for a quirk in NVIDIA OpenGL drivers
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// Shaders using local memory see a great performance benefit if a shader that was dispatched
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// before it had more local memory allocated.
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// This shader allocates the maximum local memory allowed on NVIDIA drivers to ensure that
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// subsequent shaders see the performance boost.
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// NOTE: This shader does no actual meaningful work and returns immediately,
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// it is simply a means to have the driver expect a shader using lots of local memory.
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#version 450
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layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
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layout(location = 0) uniform uint uniform_data;
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layout(binding = 0, rgba8) uniform writeonly restrict image2DArray dest_image;
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#define MAX_LMEM_SIZE 4080 // Size chosen to avoid errors in Nvidia's GLSL compiler
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#define NUM_LMEM_CONSTANTS 1
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#define ARRAY_SIZE MAX_LMEM_SIZE - NUM_LMEM_CONSTANTS
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uint lmem_0[ARRAY_SIZE];
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const uvec4 constant_values[NUM_LMEM_CONSTANTS] = uvec4[](uvec4(0));
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void main() {
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const uint global_id = gl_GlobalInvocationID.x;
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if (global_id <= 128) {
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// Since the shader is called with a dispatch of 1x1x1
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// This should always be the case, and this shader will not actually execute
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return;
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}
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for (uint t = 0; t < uniform_data; t++) {
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const uint offset = (t * uniform_data);
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lmem_0[offset] = t;
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}
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const uint offset = (gl_GlobalInvocationID.y * uniform_data + gl_GlobalInvocationID.x);
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const uint value = lmem_0[offset];
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const uint const_value = constant_values[offset / 4][offset % 4];
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const uvec4 color = uvec4(value + const_value);
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// A "side-effect" is needed so the variables don't get optimized out,
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// but this should never execute so there should be no clobbering of previously bound state.
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imageStore(dest_image, ivec3(gl_GlobalInvocationID), color);
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}
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