Fix OpenGL ES 3.0 shader and renderer compatibility to resolve invalid operation errors

[Copilot]

• Fix 1 - float_expr → 1.0 - float_expr in sdf_raymarching.frag line 171
• Fix vec3(0, 1, 0) → vec3(0.0, 1.0, 0.0) in sdf_raymarching.frag lines 138, 176
• Fix vec4(..., 0) → vec4(..., 0.0) in sdf_raymarching.frag line 268
• Fix max(finalMaterialId, 0) int result in vec3(...) → float(max(finalMaterialId, 0)) in sdf_distance.frag line 155
• Fix vec4(..., 0) → vec4(..., 0.0) in sdf_distance.frag line 283
• Fix int literals in vec2(...) constructors in jump_flood_step.frag line 45

[damacaa]

[deck@steamdeck build]$ /home/deck/Documents/GitHub/weird-engine/examples/sample-scenes/build/WeirdSamples
Framebuffer is not complete!
terminate called without an active exception
Aborted (core dumped) /home/deck/Documents/GitHub/weird-engine/examples/sample-scenes/build/WeirdSamples
[deck@steamdeck build]$

istill get this error

[Copilot]

[deck@steamdeck build]$ /home/deck/Documents/GitHub/weird-engine/examples/sample-scenes/build/WeirdSamples
Framebuffer is not complete!
terminate called without an active exception...

Fixed in c64d1b3. Three issues were causing this:

1. Root cause — invalid depth texture type: In GLES 3.0, GL_DEPTH_COMPONENT24 requires GL_UNSIGNED_INT as the pixel type, not GL_FLOAT. The invalid glTexImage2D call left the depth texture in a broken state, which then caused the framebuffer attachment to be incomplete.

2. Crash on incomplete framebuffer: The throw; statement in RenderTarget::bindTextureToFrameBuffer was called with no active exception, which invokes std::terminate() — that's the "terminate called without an active exception" message. Changed to throw std::runtime_error("Framebuffer is not complete!").

3. Unsized color formats: Changed GL_RGB → GL_RGB8 and GL_RGBA → GL_RGBA8 for Color/ColorAlpha/RetroColor texture types. Unsized internal formats are not guaranteed to be color-renderable as framebuffer attachments in GLES 3.0; the sized equivalents are required by the spec.