diff options
Diffstat (limited to 'client/shaders/nodes_shader/opengl_fragment.glsl')
| -rw-r--r-- | client/shaders/nodes_shader/opengl_fragment.glsl | 134 |
1 files changed, 95 insertions, 39 deletions
diff --git a/client/shaders/nodes_shader/opengl_fragment.glsl b/client/shaders/nodes_shader/opengl_fragment.glsl index 6dc96eb48..066e49658 100644 --- a/client/shaders/nodes_shader/opengl_fragment.glsl +++ b/client/shaders/nodes_shader/opengl_fragment.glsl @@ -8,6 +8,7 @@ uniform vec3 eyePosition; varying vec3 vPosition; varying vec3 worldPosition; +varying float generate_heightmaps; varying vec3 eyeVec; varying vec3 tsEyeVec; @@ -19,80 +20,135 @@ bool normalTexturePresent = false; const float e = 2.718281828459; const float BS = 10.0; -float intensity (vec3 color){ +float intensity (vec3 color) +{ return (color.r + color.g + color.b) / 3.0; } -float get_rgb_height (vec2 uv){ +float get_rgb_height (vec2 uv) +{ return intensity(texture2D(baseTexture,uv).rgb); } -vec4 get_normal_map(vec2 uv){ +vec4 get_normal_map(vec2 uv) +{ vec4 bump = texture2D(normalTexture, uv).rgba; - bump.xyz = normalize(bump.xyz * 2.0 -1.0); - bump.y = -bump.y; + bump.xyz = normalize(bump.xyz * 2.0 - 1.0); return bump; } +float find_intersection(vec2 dp, vec2 ds) +{ + const int linear_steps = 10; + const int binary_steps = 5; + const float depth_step = 1.0 / linear_steps; + float size = depth_step; + float depth = 1.0; + float best_depth = 1.0; + for (int i = 0 ; i < linear_steps - 1 ; ++i) { + vec4 t = texture2D(normalTexture, dp + ds * depth); + if (best_depth > 0.05) + if (depth >= t.a) + best_depth = depth; + depth -= size; + } + depth = best_depth - size; + for (int i = 0 ; i < binary_steps ; ++i) { + size *= 0.5; + vec4 t = texture2D(normalTexture, dp + ds * depth); + if (depth >= t.a) { + best_depth = depth; + depth -= 2 * size; + } + depth += size; + } + return best_depth; +} + +float find_intersectionRGB(vec2 dp, vec2 ds) { + const float iterations = 24; + const float depth_step = 1.0 / iterations; + float depth = 1.0; + for (int i = 0 ; i < iterations ; i++) { + float h = get_rgb_height(dp + ds * depth); + if (h >= depth) + break; + depth -= depth_step; + } + return depth; +} + void main (void) { vec3 color; vec4 bump; vec2 uv = gl_TexCoord[0].st; bool use_normalmap = false; - + #ifdef USE_NORMALMAPS - if (texture2D(useNormalmap,vec2(1.0,1.0)).r > 0.0){ + if (texture2D(useNormalmap,vec2(1.0, 1.0)).r > 0.0) { normalTexturePresent = true; } #endif #ifdef ENABLE_PARALLAX_OCCLUSION - if (normalTexturePresent){ - vec3 tsEye = normalize(tsEyeVec); - float height = PARALLAX_OCCLUSION_SCALE * texture2D(normalTexture, uv).a - PARALLAX_OCCLUSION_BIAS; - uv = uv + texture2D(normalTexture, uv).z * height * vec2(tsEye.x,-tsEye.y); + vec3 eyeRay = normalize(tsEyeVec); +#if PARALLAX_OCCLUSION_MODE == 0 + // Parallax occlusion with slope information + if (normalTexturePresent) { + const float scale = PARALLAX_OCCLUSION_SCALE / PARALLAX_OCCLUSION_ITERATIONS; + const float bias = PARALLAX_OCCLUSION_BIAS / PARALLAX_OCCLUSION_ITERATIONS; + for(int i = 0; i < PARALLAX_OCCLUSION_ITERATIONS; i++) { + vec4 normal = texture2D(normalTexture, uv.xy); + float h = normal.a * scale - bias; + uv += h * normal.z * eyeRay.xy; + } +#endif +#if PARALLAX_OCCLUSION_MODE == 1 + // Relief mapping + if (normalTexturePresent) { + vec2 ds = eyeRay.xy * PARALLAX_OCCLUSION_SCALE; + float dist = find_intersection(uv, ds); + uv += dist * ds; +#endif + } else if (generate_heightmaps > 0.0) { + vec2 ds = eyeRay.xy * PARALLAX_OCCLUSION_SCALE; + float dist = find_intersectionRGB(uv, ds); + uv += dist * ds; } #endif #ifdef USE_NORMALMAPS - if (normalTexturePresent){ + if (normalTexturePresent) { bump = get_normal_map(uv); use_normalmap = true; } #endif - -#ifdef GENERATE_NORMALMAPS - if (use_normalmap == false){ - float tl = get_rgb_height (vec2(uv.x-SAMPLE_STEP,uv.y+SAMPLE_STEP)); - float t = get_rgb_height (vec2(uv.x-SAMPLE_STEP,uv.y-SAMPLE_STEP)); - float tr = get_rgb_height (vec2(uv.x+SAMPLE_STEP,uv.y+SAMPLE_STEP)); - float r = get_rgb_height (vec2(uv.x+SAMPLE_STEP,uv.y)); - float br = get_rgb_height (vec2(uv.x+SAMPLE_STEP,uv.y-SAMPLE_STEP)); - float b = get_rgb_height (vec2(uv.x,uv.y-SAMPLE_STEP)); - float bl = get_rgb_height (vec2(uv.x-SAMPLE_STEP,uv.y-SAMPLE_STEP)); - float l = get_rgb_height (vec2(uv.x-SAMPLE_STEP,uv.y)); + + if (GENERATE_NORMALMAPS == 1 && use_normalmap == false) { + float tl = get_rgb_height(vec2(uv.x - SAMPLE_STEP, uv.y + SAMPLE_STEP)); + float t = get_rgb_height(vec2(uv.x - SAMPLE_STEP, uv.y - SAMPLE_STEP)); + float tr = get_rgb_height(vec2(uv.x + SAMPLE_STEP, uv.y + SAMPLE_STEP)); + float r = get_rgb_height(vec2(uv.x + SAMPLE_STEP, uv.y)); + float br = get_rgb_height(vec2(uv.x + SAMPLE_STEP, uv.y - SAMPLE_STEP)); + float b = get_rgb_height(vec2(uv.x, uv.y - SAMPLE_STEP)); + float bl = get_rgb_height(vec2(uv.x -SAMPLE_STEP, uv.y - SAMPLE_STEP)); + float l = get_rgb_height(vec2(uv.x - SAMPLE_STEP, uv.y)); float dX = (tr + 2.0 * r + br) - (tl + 2.0 * l + bl); float dY = (bl + 2.0 * b + br) - (tl + 2.0 * t + tr); - bump = vec4 (normalize(vec3 (dX, -dY, NORMALMAPS_STRENGTH)),1.0); + bump = vec4(normalize(vec3 (-dX, -dY, NORMALMAPS_STRENGTH)), 1.0); use_normalmap = true; } -#endif -vec4 base = texture2D(baseTexture, uv).rgba; - + vec4 base = texture2D(baseTexture, uv).rgba; + #ifdef ENABLE_BUMPMAPPING - if (use_normalmap){ + if (use_normalmap) { vec3 L = normalize(lightVec); - vec3 E = normalize(eyeVec); - float specular = pow(clamp(dot(reflect(L, bump.xyz), E), 0.0, 1.0),0.5); - float diffuse = dot(E,bump.xyz); - /* Mathematic optimization - * Original: color = 0.05*base.rgb + diffuse*base.rgb + 0.2*specular*base.rgb; - * This optimization save 2 multiplications (orig: 4 multiplications + 3 additions - * end: 2 multiplications + 3 additions) - */ - color = (0.05 + diffuse + 0.2 * specular) * base.rgb; + vec3 E = normalize(-eyeVec); + float specular = pow(clamp(dot(reflect(L, bump.xyz), -E), 0.0, 1.0), 1.0); + float diffuse = dot(E,bump.xyz); + color = (diffuse + 0.1 * specular) * base.rgb; } else { color = base.rgb; } @@ -104,7 +160,7 @@ vec4 base = texture2D(baseTexture, uv).rgba; float alpha = gl_Color.a; vec4 col = vec4(color.rgb, alpha); col *= gl_Color; - if(fogDistance != 0.0){ + if (fogDistance != 0.0) { float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0)); alpha = mix(alpha, 0.0, d); } @@ -112,7 +168,7 @@ vec4 base = texture2D(baseTexture, uv).rgba; #else vec4 col = vec4(color.rgb, base.a); col *= gl_Color; - if(fogDistance != 0.0){ + if (fogDistance != 0.0) { float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0)); col = mix(col, skyBgColor, d); } |