ios - GLSL 着色器错误 "Constructor calls may not have precision"

Question

GLSL 着色器错误 错误:0:1:'(':语法错误:构造函数调用可能没有精度

我在基于 GLPaint 演示的 iOS 8 应用程序上使用 Xcode 6 看到此错误...(在 iOS7 中工作正常)

我还注意到他们在 GLPaint 演示版本 1.13 中不再使用“STRINGIFY”。

---

.vsh

static const char* BaseVS = STRINGIFY
(


attribute highp vec4 inVertex;

uniform highp mat4 MVP;
uniform highp float pointSize;
uniform highp vec4 vertexColor;
uniform highp float brushRotation;

varying highp vec4 color;


void main()
{
    gl_Position = MVP * inVertex;
    gl_PointSize = pointSize;
    color = vertexColor;
}

);

---

.fsh

static const char* BaseFS = STRINGIFY
(


uniform sampler2D texture;
uniform sampler2D normalMap;
uniform highp float brushRotation;

varying highp vec4 color;
varying highp vec3 normal;
varying highp vec3 lightDir;
varying highp vec3 eyeVec;

precision highp float;

 void main (void)

{


highp float vRotation = (brushRotation/180.0)*3.14;;
highp float mid = 0.5;
highp vec2 rotated = vec2(cos(vRotation) * (gl_PointCoord.x - mid) + sin(vRotation) * (gl_PointCoord.y - mid) + mid,
                    cos(vRotation) * (gl_PointCoord.y - mid) - sin(vRotation) * (gl_PointCoord.x - mid) + mid);
highp vec4 rotatedTexture = texture2D( texture,  rotated);


gl_FragColor = color * rotatedTexture;

}

);

Answer 1

问题出在用于随机生成的方法中。我在 vec2() 构造之前删除了“高”。 (叹气)

 highp float rand(highp vec2 co)
{
    return fract(sin(dot(co.xy ,highp vec2(12.9898,78.233))) * 43758.5453);
}