From a18c8c422d25fa96d3df96758a38e44f47514acb Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Mon, 10 Oct 2022 20:13:14 -0700 Subject: *: pivot everything to OpenGL ES 2.0 In the interests of keeping things bisectable this is one big commit of everything necessary to go from OpenGL 2.1 to OpenGL ES 2.0 in one fell swoop. There's a handful of annoying mechanical changes necessary in shaders like removing the 'f' suffix on float constants e.g. 1.f becomes 1.0 etc. This is primarily happening to enable emscripten builds --- src/plasma-node.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) (limited to 'src/plasma-node.c') diff --git a/src/plasma-node.c b/src/plasma-node.c index 1eb4c7a..0ad8752 100644 --- a/src/plasma-node.c +++ b/src/plasma-node.c @@ -26,50 +26,55 @@ static const char *plasma_vs = "" - "#version 120\n" + "#version 100\n" "uniform mat4 projection_x;" "attribute vec3 vertex;" "attribute vec2 texcoord;" + "varying vec2 UV;" + "void main()" "{" - " gl_TexCoord[0].xy = texcoord;" - " gl_Position = projection_x * vec4(vertex, 1.f);" + " UV = texcoord;" + " gl_Position = projection_x * vec4(vertex, 1.0);" "}" ""; // derived from https://www.bidouille.org/prog/plasma static const char *plasma_fs = "" - "#version 120\n" + "#version 100\n" "#define PI 3.1415926535897932384626433832795\n" + "precision mediump float;" "uniform float alpha;" "uniform float time;" + "varying vec2 UV;" + "void main() {" " float v;" - " float stime = sin(time * .01f) * 100.f;" + " float stime = sin(time * .01) * 100.0;" - " vec2 c = gl_TexCoord[0].st;" + " vec2 c = UV;" // this zooms the texture coords in and out a bit with time - " c *= (sin(stime * .01f) *.5f + .5f) * 3.f + 1.f;" + " c *= (sin(stime * .01) *.5 + .5) * 3.0 + 1.0;" // plasma calculations, stime instead of time directly to vary directions and speed " v = sin((c.x + stime));" - " v += sin((c.y + stime) * .5f);" - " v += sin((c.x + c.y +stime) * .5f);" + " v += sin((c.y + stime) * .5);" + " v += sin((c.x + c.y +stime) * .5);" - " c += vec2(sin(stime * .33f), cos(stime * .5f)) * 3.f;" + " c += vec2(sin(stime * .33), cos(stime * .5)) * 3.0;" - " v += sin(sqrt(c.x * c.x + c.y * c.y + 1.f) + stime);" + " v += sin(sqrt(c.x * c.x + c.y * c.y + 1.0) + stime);" - " vec3 col = vec3(cos(PI * v + sin(time)), sin(PI * v + cos(time * .33f)), cos(PI * v + sin(time * .66f)));" - " gl_FragColor = vec4(col * .5f + .5f, alpha);" + " vec3 col = vec3(cos(PI * v + sin(time)), sin(PI * v + cos(time * .33)), cos(PI * v + sin(time * .66)));" + " gl_FragColor = vec4(col * .5 + .5, alpha);" "}" ""; -- cgit v1.2.3