Hi,
I'm trying to implement the bump mapping shader parallax from typhoonlabs (http://www.typhoonlabs.com/ very good GLSL tutorials) so my shader is the following
Vert:
attribute vec3 tangent;
attribute vec3 binormal;
// inverse light radius ie.. 1.0/light radius;
uniform float u_invRad;
varying vec3 g_lightVec;
varying vec3 g_viewVec;
/* ===========[ for test only!! ]============ */
//uniform float RSINW, RCOSW;
/* ===========[ end ]======================== */
void main()
{
gl_Position = ftransform();
gl_TexCoord[0] = gl_MultiTexCoord0;
mat3 TBN_Matrix = gl_NormalMatrix * mat3(tangent, binormal, gl_Normal);
vec4 mv_Vertex = gl_ModelViewMatrix * gl_Vertex;
g_viewVec = vec3(-mv_Vertex) * TBN_Matrix;
vec4 light = gl_ModelViewMatrix * gl_LightSource[0].position;
vec3 lightVec = u_invRad * (light.xyz - mv_Vertex.xyz);
g_lightVec = lightVec * TBN_Matrix;
}
Frag:
/*
Normal - normal texture
Base_Height - Base texture with height map in alpha channel
*/
uniform sampler2D Normal;
uniform sampler2D base_tex;
uniform sampler2D Base_Height; // height in alpha ch.
varying vec3 g_lightVec;
varying vec3 g_viewVec;
uniform vec2 cBumpSize = 0.02 * vec2 (2.0, -1.0);
void main()
{
float LightAttenuation = clamp(1.0 - dot(g_lightVec, g_lightVec), 0.0, 1.0);
vec3 lightVec = normalize(g_lightVec);
vec3 viewVec = normalize(g_viewVec);
float height = texture2D(Base_Height, gl_TexCoord[0].xy).r;
height = height * cBumpSize.x + cBumpSize.y;
vec2 newUV = gl_TexCoord[0].xy + viewVec.xy * height;
vec4 color_base = texture2D(base_tex,newUV);
vec3 bump = texture2D(Normal, newUV.xy).rgb * 2.0 - 1.0;
bump = normalize(bump);
//vec4 base = texture2D(Base_Height, newUV.xy);
float base = texture2D(Base_Height, newUV.xy).r;
float diffuse = clamp(dot(lightVec, bump), 0.0, 1.0);
float specular = pow(clamp(dot(reflect(-viewVec, bump), lightVec), 0.0, 1.0),8.0);
gl_FragColor = color_base * gl_LightSource[0].diffuse
* (diffuse * base + 0.7 * specular)
* LightAttenuation;
gl_FragColor.a = 1.0;
}
and so I try to get it in my scene which, without the shader, looks like this:
but when I put the shader, I get this:
it's like there was an ambient light activated but only on the meshes where my shader is set, I really don't know how to suppress it ....
so I suspected the shader, since withouth the shader, the scene was normally dark, however when I run it in a smaller class, I get this:
which is basically what I'm looking for, so I wonder if there wouldn't be a problem with the fact that on my bigger scene, I have several lights, and that my shader is working only with one, but I really don't know,
any help greatly appreciated,
Adrien
Edit: Could it be related to the fact that I just put my shader in only one renderstate and then I apply this same renderstate to all my quads?