當我在計算機上運行該程序時,它的工作原理與我預期的一樣。但是,當我嘗試在校園實驗室計算機上運行它時,片段着色器各種奇怪。片段着色器在不同的計算機上執行的方式不同
現在,它只是一個簡單的Phong照明計算,其中點光源在原點。但是,在實驗室電腦上,它看起來更像是cel陰影和手電筒之間的一種奇怪的交叉。我運行ATI顯卡,而實驗室電腦運行NVIDIA。陰影在Mac上也按預期工作(不知道顯卡)。
NVIDIA卡支持OpenGL 3.1,儘管我在2.1版本的Linux發行版上運行它。我已經嘗試將着色器版本固定爲1.2(GLSL),其中包括其他許多東西,但它們的效果相同。最奇怪的是,當我使用頂點着色而不是像素着色時,兩臺計算機的結果都是一樣的......我已經用盡了我的想法來解決這個問題。
這裏的頂點着色器:
#version 120
attribute vec2 aTexCoord;
attribute vec3 aPosition;
attribute vec3 aNormal;
attribute vec3 camLoc;
attribute float mat;
varying vec3 vColor;
varying vec2 vTexCoord;
varying vec3 normals;
varying vec3 lightPos;
varying vec3 camPos;
varying float material;
uniform mat4 uProjMatrix;
uniform mat4 uViewMatrix;
uniform mat4 uModelMatrix;
uniform mat4 uNormMatrix;
uniform vec3 uLight;
uniform vec3 uColor;
void main()
{
//set up object position in world space
vec4 vPosition = uModelMatrix * vec4(aPosition, 1.0);
vPosition = uViewMatrix * vPosition;
vPosition = uProjMatrix * vPosition;
gl_Position = vPosition;
//set up light vector in world space
vec4 vLight = vec4(uLight, 1.0) * uViewMatrix;
lightPos = vLight.xyz - vPosition.xyz;
//set up normal vector in world space
normals = (vec4(aNormal,1.0) * uNormMatrix).xyz;
//set up view vector in world space
camPos = camLoc.xyz - vPosition.xyz;
//set up material shininess
material = mat;
//pass color and vertex
vColor = uColor;
vTexCoord = aTexCoord;
}
而片段着色器:
#version 120
varying vec3 lightPos;
varying vec3 normals;
varying vec3 camPos;
varying vec2 vTexCoord;
varying vec3 vColor;
varying float material;
uniform sampler2D uTexUnit;
uniform mat4 uProjMatrix;
uniform mat4 uViewMatrix;
uniform mat4 uModelMatrix;
void main(void)
{
float diffuse;
float diffuseRed, diffuseBlue, diffuseGreen;
float specular;
float specRed, specBlue, specGreen;
vec3 lightColor = vec3(0.996, 0.412, 0.706); //color of light (HOT PINK) **UPDATE WHEN CHANGED**
vec4 L; //light vector
vec4 N; //normal vector
vec4 V; //view vector
vec4 R; //reflection vector
vec4 H; //halfway vector
float red;
float green;
float blue;
vec4 texColor1 = texture2D(uTexUnit, vTexCoord);
//diffuse calculations
L = vec4(normalize(lightPos),0.0);
N = vec4(normalize(normals),0.0);
N = uModelMatrix * N;
//calculate RGB of diffuse light
diffuse = max(dot(N,L),0.0);
diffuseRed = diffuse*lightColor[0];
diffuseBlue = diffuse*lightColor[1];
diffuseGreen = diffuse*lightColor[2];
//specular calculations
V = vec4(normalize(camPos),0.0);
V = uModelMatrix * V;
R = vec4(-1.0 * L.x, -1.0 * L.y, -1.0 * L.z, 0.0);
float temp = 2.0*dot(L,N);
vec3 tempR = vec3(temp * N.x, temp * N.y, temp * N.z);
R = vec4(R.x + tempR.x, R.y + tempR.y, R.z + tempR.z, 0.0);
R = normalize(R);
H = normalize(L + V);
specular = dot(H,R);
specular = pow(specular,material);
specRed = specular*lightColor[0];
specBlue = specular*lightColor[1];
specGreen = specular*lightColor[2];
//set new colors
//textures
red = texColor1[0]*diffuseRed + texColor1[0]*specRed*0.7 + texColor1[0]*.05;
green = texColor1[1]*diffuseBlue + texColor1[1]*specBlue*0.7 + texColor1[1]*.05;
blue = texColor1[2]*diffuseGreen + texColor1[2]*specGreen*0.7 + texColor1[2]*.05;
//colors
red = vColor[0]*diffuseRed + vColor[0]*specRed*0.7 + vColor[0]*.05;
green = vColor[1]*diffuseBlue + vColor[1]*specBlue*0.7 + vColor[1]*.05;
blue = vColor[2]*diffuseGreen + vColor[2]*specGreen*0.7 + vColor[2]*.05;
gl_FragColor = vec4(red, green, blue, 1.0);
}
你可以發佈你的代碼和/或屏幕截圖嗎?盲目調試圖形代碼很困難。 – duskwuff
我已添加代碼,但目前無法發佈屏幕截圖。目前我正在家工作,無法訪問其他計算機。 –
GLSL編譯/鏈接日誌中的任何內容? – genpfault