Rendertarget samples broken with G4onG5

[SunDaw]

Describe the bug
Several render target samples from https://github.com/Kode/Kinc-Samples crash with G4onG5 backends (tested with both D3D12 and Vulkan).

To Reproduce
Steps to reproduce the behavior:

1. Clone https://github.com/Kode/Kinc-Samples
2. Build either of 06_render_targets, 07_multiple_render_targets or 08_float_render_targets
3. Run executable, crashes on first update call

Expected behavior
Samples should work the same way they do with Direct3D11/OpenGL backends

Execution Environment:

• Host system (where you compile your code): Windows 10 Home 22H2
• Target system (where you run your code): Windows 10 Home 22H2
• IDE and/or compiler used: MSVC 17.9.0
• Kinc revision: 3525720

Additional context
Callstack shows crash in "G4.c.h" startDraw on memcpy(current_state.vertex_constant_data, vertexConstantBuffer.data, constantBufferSize); because vertexConstantBuffer.data is a nullpointer

Example.exe!memcpy() Line 304 Unknown
Example.exe!startDraw(bool compute) Line 167 C
Example.exe!kinc_g4_draw_indexed_vertices() Line 264 C
Example.exe!update(void * data) Line 42 C
Example.exe!kinc_internal_update_callback() Line 483 C
Example.exe!kinc_internal_frame() Line 577 C
Example.exe!kinc_start() Line 591 C
Example.exe!kickstart(int argc, char * * argv) Line 118 C
Example.exe!WinMain(HINSTANCE__ * hInstance, HINSTANCE__ * hPrevInstance, char * lpCmdLine, int nCmdShow) Line 1324 C

[SunDaw]

Note: sample 09_depth_render_targets works fine, I haven't investigated what it does differently

[RobDangerous]

Dave gets this for 06 with Vulkan:
Vulkan ERROR: Code 7060244 : Validation Error: [ UNASSIGNED-CoreValidation-Shader-InconsistentSpirv ] Object 0: handle = 0x55555b060ac8, type = VK_OBJECT_TYPE_DEVICE; | MessageID = 0x6bbb14 | SPIR-V module not valid: ID 22[%22] has not been defined %23 = OpVariable %22 Function

[RobDangerous]

False alarm on that one, Dave uses Kong.