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Move to parallax.glsl

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This commit is contained in:
scrawl 2016-03-22 21:15:20 +01:00
parent b4dda045a6
commit b59b2c6d6d
3 changed files with 11 additions and 5 deletions
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1
files/shaders/CMakeLists.txt
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@ -11,6 +11,7 @@ set(SHADER_FILES
terrain_vertex.glsl
terrain_fragment.glsl
lighting.glsl
parallax.glsl
)
copy_all_files(${CMAKE_CURRENT_SOURCE_DIR} ${DDIR} "${SHADER_FILES}")

8
files/shaders/parallax.glsl Normal file
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@ -0,0 +1,8 @@
#define PARALLAX_SCALE 0.04
#define PARALLAX_BIAS -0.02
vec2 getParallaxOffset(vec3 eyeDir, mat3 tbn, float height)
{
vec3 TSeyeDir = normalize((vec4(normalize(tbn * eyeDir),0)).xyz);
return TSeyeDir.xy * ( height * PARALLAX_SCALE + PARALLAX_BIAS );
}

7
files/shaders/terrain_fragment.glsl
View File

@ -25,12 +25,11 @@ varying vec3 passViewPos;
varying vec3 passNormal;
#if @parallax
#define PARALLAX_SCALE 0.04
#define PARALLAX_BIAS -0.02
uniform mat4 osg_ViewMatrixInverse;
#endif
#include "lighting.glsl"
#include "parallax.glsl"
void main()
{
@ -53,9 +52,7 @@ void main()
#if @parallax
vec3 cameraPos = osg_ViewMatrixInverse[3].xyz;
vec3 eyeDir = normalize(cameraPos - (osg_ViewMatrixInverse * vec4(passViewPos, 1)).xyz);
vec3 TSeyeDir = normalize((vec4(normalize(tbn * eyeDir),0)).xyz);
adjustedUV += TSeyeDir.xy * ( normalTex.a * PARALLAX_SCALE + PARALLAX_BIAS );
adjustedUV += getParallaxOffset(eyeDir, tbn, normalTex.a);
// update normal using new coordinates
normalTex = texture2D(normalMap, adjustedUV);