source/blender/gpu/CMakeLists.txt

@@ -561,6 +561,7 @@ set(GLSL_SRC
 
 set(GLSL_SRC_TEST
   tests/shaders/gpu_math_test.glsl
+  tests/shaders/gpu_buffer_texture_test.glsl
   tests/shaders/gpu_compute_1d_test.glsl
   tests/shaders/gpu_compute_2d_test.glsl
   tests/shaders/gpu_compute_ibo_test.glsl
@@ -841,6 +842,7 @@ if(WITH_GTESTS)
     set(TEST_SRC
       tests/gpu_testing.cc
 
+      tests/buffer_texture_test.cc
       tests/framebuffer_test.cc
       tests/immediate_test.cc
       tests/index_buffer_test.cc

source/blender/gpu/shaders/infos/gpu_shader_test_info.hh

@@ -85,6 +85,13 @@ GPU_SHADER_CREATE_INFO(gpu_push_constants_512bytes_test)
     .push_constant(Type::FLOAT, "filler3", 64)
     .do_static_compilation(true);
 
+GPU_SHADER_CREATE_INFO(gpu_buffer_texture_test)
+    .local_group_size(1)
+    .sampler(0, ImageType::FLOAT_BUFFER, "bufferTexture")
+    .storage_buf(0, Qualifier::WRITE, "float", "data_out[]")
+    .compute_source("gpu_buffer_texture_test.glsl")
+    .do_static_compilation(true);
+
 GPU_SHADER_CREATE_INFO(eevee_shadow_test)
     .fragment_source("eevee_shadow_test.glsl")
     .additional_info("gpu_shader_test")

source/blender/gpu/tests/buffer_texture_test.cc

@@ -0,0 +1,66 @@
+#include "testing/testing.h"
+
+#include "GPU_capabilities.h"
+#include "GPU_compute.h"
+#include "GPU_vertex_buffer.h"
+#include "GPU_vertex_format.h"
+
+#include "BLI_index_range.hh"
+#include "BLI_math_vector_types.hh"
+
+#include "gpu_testing.hh"
+
+namespace blender::gpu::tests {
+
+static constexpr int Size = 256;
+
+static void test_buffer_texture()
+{
+  if (!GPU_compute_shader_support() && !GPU_shader_storage_buffer_objects_support()) {
+    /* We can't test as a the platform does not support compute shaders. */
+    std::cout << "Skipping compute shader test: platform not supported";
+    GTEST_SKIP();
+  }
+
+  /* Build compute shader. */
+  GPUShader *shader = GPU_shader_create_from_info_name("gpu_buffer_texture_test");
+  EXPECT_NE(shader, nullptr);
+  GPU_shader_bind(shader);
+
+  /* Vertex buffer. */
+  GPUVertFormat format = {};
+  uint value_pos = GPU_vertformat_attr_add(&format, "value", GPU_COMP_F32, 1, GPU_FETCH_FLOAT);
+  GPUVertBuf *vertex_buffer = GPU_vertbuf_create_with_format_ex(
+      &format, GPU_USAGE_FLAG_BUFFER_TEXTURE_ONLY);
+  float4 value = float4(42.42, 23.23, 1.0, -1.0);
+  GPU_vertbuf_data_alloc(vertex_buffer, 4);
+  GPU_vertbuf_attr_fill(vertex_buffer, value_pos, &value);
+  GPU_vertbuf_bind_as_texture(vertex_buffer,
+                              GPU_shader_get_sampler_binding(shader, "bufferTexture"));
+
+  /* Construct SSBO. */
+  GPUStorageBuf *ssbo = GPU_storagebuf_create_ex(
+      4 * sizeof(float), nullptr, GPU_USAGE_DEVICE_ONLY, __func__);
+  GPU_storagebuf_bind(ssbo, GPU_shader_get_ssbo_binding(shader, "data_out"));
+
+  /* Dispatch compute task. */
+  GPU_compute_dispatch(shader, 4, 1, 1);
+
+  /* Check if compute has been done. */
+  GPU_memory_barrier(GPU_BARRIER_BUFFER_UPDATE);
+
+  /* Download the index buffer. */
+  float4 read_data;
+  GPU_storagebuf_read(ssbo, read_data);
+  EXPECT_EQ(read_data, value);
+
+  /* Cleanup. */
+  GPU_shader_unbind();
+  GPU_storagebuf_free(ssbo);
+  GPU_vertbuf_discard(vertex_buffer);
+  GPU_shader_free(shader);
+}
+
+GPU_TEST(buffer_texture)
+
+}  // namespace blender::gpu::tests

source/blender/gpu/tests/shaders/gpu_buffer_texture_test.glsl

@@ -0,0 +1,6 @@
+void main()
+{
+  int index = int(gl_GlobalInvocationID.x);
+  float value = texelFetch(bufferTexture, index).r;
+  data_out[index] = value;
+}