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shader_uniform(3) Arcan Lua API shader_uniform(3) NAME shader_uniform - Set values for a uniform values in a specific shader. SYNOPSIS nil shader_uniform( shid, symlbl, typestr, vals ) DESCRIPTION A shader can have a number of uniform variables declared. The specific val- ues of such a uniform can be set through this function. shid is a reference to a shader allocated through build_shader. symlbl is the identifier of the uniform and typestr is a string that specifies the actual type of the uni- form. Accepted patterns for typestr include "b" (bool), "i" (int) "f" (float), "ff" (vec2), "fff" (vec3), "ffff" (vec4), f*16 (mat4). It is also possible for one shaderid to maintain different sets of uniform values. Each group is tied to the life-cycle of the program and is allocated with shader_ugroup . The id that is returned can then be used in image_shader to specify which subgroup that is to be used. NOTES 1 There is a deprecated version of this function around that has a PERSIST or NOPERSIST value placed after typestr . This is now ig- nored and forced to PERSIST (keep local copies of uniforms that can survive video layer resets). This has the side-effect that the argu- ment validation is less aggressive and may permit a mismatch of up to one argument. EXAMPLE function shader_uniform0() local shid = build_shader(nil, [[ uniform float vec3 col; void shader_uniform0(){ gl_FragColor = vec4(col, 1.0); }]], "csh"); a = fill_surface(128, 128, 0, 0, 0); show_image(a); image_shader(a, shid); shader_uniform(shid, "col", "fff", PERSIST, 0.0, 1.0, 0.0); end SEE ALSO: shader_ugroup(3) image_shader(3) build_shader(3) vidsys August 2026 shader_uniform(3)
NAME | SYNOPSIS | DESCRIPTION | NOTES | EXAMPLE | SEE ALSO:
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