因此,我试图使颜色或三角形从渐变更改为纯色!我不太确定出了什么问题,我以与size相同的方式声明了gradientChange的统一变量,并且size可以正常工作并增加三角形的大小,但是我尝试在java代码中更改gradientChange,值更改,但颜色在三角形上不会改变。还有一个关于GLSL代码格式的问题,在我在线上看到的所有示例中,每个示例都可以在单独的行中包含声明,但是当我尝试这样做时,它会破坏代码?
public void display(GLAutoDrawable drawable) {
GL4 gl = (GL4) GLContext.getCurrentGL();
gl.glClear(GL_DEPTH_BUFFER_BIT);
gl.glClear(GL_COLOR_BUFFER_BIT);
gl.glUseProgram(renderingProgram);
x+=inc;
if(x>1.0f)inc = -0.01f;
if(x<-1.0f)inc = 0.01f;
int offsetLoc = gl.glGetUniformLocation(renderingProgram, "offset");
gl.glProgramUniform1f(renderingProgram, offsetLoc, x);
int gradientloc = gl.glGetUniformLocation(renderingProgram, "gradientChange");
gl.glProgramUniform1f(renderingProgram, gradientloc, gradientChange);
int sizeloc = gl.glGetUniformLocation(renderingProgram, "size");
gl.glProgramUniform1f(renderingProgram, sizeloc, size);
gl.glDrawArrays(GL_TRIANGLES, 0, 3);
}
这是我的vertShader.glsl
#version 430
out vec4 varyingColor; uniform float offset; uniform int gradientChange; vec4 colorChange; uniform float size;
void main(void)
{ if (gl_VertexID == 0){ gl_Position = vec4(size * (0.25+offset), size * (-0.25), 0.0, 1.0);
colorChange = vec4( 1.0,0.0,0.0,1.0);}
if (gl_VertexID == 1){ gl_Position = vec4(size * (-0.25+offset), size * (-0.25), 0.0, 1.0);
colorChange = vec4( 0.0,1.0,0.0,1.0);}
if (gl_VertexID == 2){ gl_Position = vec4(size * (0.0+offset), size * (0.25), 0.0, 1.0);
colorChange = vec4( 0.0,0.0,1.0,1.0);}
if(gradientChange == 1){varyingColor = vec4( 1.0,0.0,0.0,1.0);}else{varyingColor = colorChange;}
}
gradientChange
的类型是int
,因此必须使用glProgramUniform1i
而不是glProgramUniform1f
来设置变量的值:(请参见glProgramUniform
)
glProgramUniform
gl.glProgramUniform1f(renderingProgram, gradientloc, gradientChange);