BUG: Does not work on Android

[crykn]

BUG: Does not work on Android

[crykn]

Which shader are you using? The library itself doesn't offer any and the GLTransitionsShaderTransition class doesn't add any constants to the shaders it is provided with:

libgdx-screenmanager/src/main/java/de/eskalon/commons/screen/transition/impl/GLTransitionsShaderTransition.java

Lines 50 to 91 in 6572602

	private static final String VERT_SHADER =
	"#ifdef GL_ES\n" +
	"precision mediump float;\n" +
	"#endif\n" +
	"\n" +
	"attribute vec3 a_position;\n" +
	"attribute vec2 a_texCoord0;\n" +
	"\n" +
	"uniform mat4 u_projTrans;\n" +
	"\n" +
	"varying vec3 v_position;\n" +
	"varying vec2 v_texCoord0;\n" +
	"\n" +
	"void main() {\n" +
	" v_position = a_position;\n" +
	" v_texCoord0 = a_texCoord0;\n" +
	" gl_Position = u_projTrans * vec4(a_position, 1.0);\n" +
	"}";
	private static final String FRAG_SHADER_PREPEND =
	"#ifdef GL_ES\n" +
	"precision mediump float;\n" +
	"#endif\n" +
	"\n" +
	"varying vec3 v_position;\n" +
	"varying vec2 v_texCoord0;\n" +
	"\n" +
	"\n" +
	"\n" +
	"uniform sampler2D lastScreen;\n" +
	"uniform sampler2D currScreen;\n" +
	"uniform float progress;\n" +
	"\n" +
	"vec4 getToColor(vec2 uv) {\n" +
	" return texture2D(currScreen, uv);\n" +
	"}\n" +
	"\n" +
	"vec4 getFromColor(vec2 uv) {\n" +
	" return texture2D(lastScreen, uv);\n" +
	"}\n";
	private static final String FRAG_SHADER_POSTPEND = "\nvoid main() {\n"
	+ " gl_FragColor = transition(v_texCoord0);\n" +
	"}\n";

[dkoding]

You are right.

The problem was in the following shader:

  private String circleCropText =
            "uniform vec4 bgcolor; // = vec4(0.0, 0.0, 0.0, 1.0)\n" +
                    "\n" +
                    "vec2 ratio2 = vec2(1.0, 1.0 / ratio);\n" +
                    "float s = pow(2.0 * abs(progress - 0.5), 3.0);\n" +
                    "\n" +
                    "vec4 transition(vec2 p) {\n" +
                    "  float dist = length((vec2(p) - 0.5) * ratio2);\n" +
                    "  return mix(\n" +
                    "    progress < 0.5 ? getFromColor(p) : getToColor(p), bgcolor, step(s, dist)\n" +
                    "  );\n" +
                    "}\n";

I think I found it in one of your examples?

Changing it to this:

            "uniform vec4 bgcolor; // = vec4(0.0, 0.0, 0.0, 1.0)\n" +
                    "vec4 transition(vec2 p) {\n" +
                    "  vec2 ratio2 = vec2(1.0, 1.0 / ratio);\n" +
                    "  float s = pow(2.0 * abs(progress - 0.5), 3.0);\n" +
                    "  float dist = length((vec2(p) - 0.5) * ratio2);\n" +
                    "  return mix(\n" +
                    "    progress < 0.5 ? getFromColor(p) : getToColor(p), bgcolor, step(s, dist)\n" +
                    "  );\n" +
                    "}\n";

...fixed the problem.

The shader compiler is opinionated about constants. Variables defined outside the main method are considered constants I think... So in this case ratio2 and s would be constants in the first example.

[crykn]

I think global variable initializers must be constant expressions means that ratio2 and s can't use uniforms and must be constant values instead. Anyways, I mentioned on the wiki that there can be platform-specific limitations to compiling shaders.