uniform sampler2D baseTexture;
uniform sampler2D normalTexture;
-uniform sampler2D useNormalmap;
+uniform sampler2D textureFlags;
uniform vec4 skyBgColor;
uniform float fogDistance;
uniform vec3 eyePosition;
+// The cameraOffset is the current center of the visible world.
+uniform vec3 cameraOffset;
+uniform float animationTimer;
+
varying vec3 vPosition;
+// World position in the visible world (i.e. relative to the cameraOffset.)
+// This can be used for many shader effects without loss of precision.
+// If the absolute position is required it can be calculated with
+// cameraOffset + worldPosition (for large coordinates the limits of float
+// precision must be considered).
varying vec3 worldPosition;
varying float area_enable_parallax;
varying vec3 lightVec;
varying vec3 tsLightVec;
-bool normalTexturePresent = false;
+bool normalTexturePresent = false;
const float e = 2.718281828459;
const float BS = 10.0;
-
-float intensity (vec3 color)
+const float fogStart = FOG_START;
+const float fogShadingParameter = 1 / ( 1 - fogStart);
+
+#ifdef ENABLE_TONE_MAPPING
+
+/* Hable's UC2 Tone mapping parameters
+ A = 0.22;
+ B = 0.30;
+ C = 0.10;
+ D = 0.20;
+ E = 0.01;
+ F = 0.30;
+ W = 11.2;
+ equation used: ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
+*/
+
+vec3 uncharted2Tonemap(vec3 x)
{
- return (color.r + color.g + color.b) / 3.0;
+ return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
}
-float get_rgb_height (vec2 uv)
+vec4 applyToneMapping(vec4 color)
{
- return intensity(texture2D(baseTexture,uv).rgb);
+ color = vec4(pow(color.rgb, vec3(2.2)), color.a);
+ const float gamma = 1.6;
+ const float exposureBias = 5.5;
+ color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
+ // Precalculated white_scale from
+ //vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
+ vec3 whiteScale = vec3(1.036015346);
+ color.rgb *= whiteScale;
+ return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
+}
+#endif
+
+void get_texture_flags()
+{
+ vec4 flags = texture2D(textureFlags, vec2(0.0, 0.0));
+ if (flags.r > 0.5) {
+ normalTexturePresent = true;
+ }
}
vec4 get_normal_map(vec2 uv)
float find_intersection(vec2 dp, vec2 ds)
{
- const float depth_step = 1.0 / 24.0;
float depth = 1.0;
- for (int i = 0 ; i < 24 ; i++) {
+ float best_depth = 0.0;
+ float size = 0.0625;
+ for (int i = 0; i < 15; i++) {
+ depth -= size;
float h = texture2D(normalTexture, dp + ds * depth).a;
- if (h >= depth)
+ if (depth <= h) {
+ best_depth = depth;
break;
- depth -= depth_step;
+ }
}
- return depth;
-}
-
-float find_intersectionRGB(vec2 dp, vec2 ds) {
- const float depth_step = 1.0 / 24.0;
- float depth = 1.0;
- for (int i = 0 ; i < 24 ; i++) {
- float h = get_rgb_height(dp + ds * depth);
- if (h >= depth)
- break;
- depth -= depth_step;
+ depth = best_depth;
+ for (int i = 0; i < 4; i++) {
+ size *= 0.5;
+ float h = texture2D(normalTexture,dp + ds * depth).a;
+ if (depth <= h) {
+ best_depth = depth;
+ depth += size;
+ } else {
+ depth -= size;
+ }
}
- return depth;
+ return best_depth;
}
-void main (void)
+void main(void)
{
vec3 color;
vec4 bump;
vec2 uv = gl_TexCoord[0].st;
bool use_normalmap = false;
-
-#if USE_NORMALMAPS == 1
- if (texture2D(useNormalmap,vec2(1.0, 1.0)).r > 0.0) {
- normalTexturePresent = true;
- }
-#endif
+ get_texture_flags();
#ifdef ENABLE_PARALLAX_OCCLUSION
vec2 eyeRay = vec2 (tsEyeVec.x, -tsEyeVec.y);
const float scale = PARALLAX_OCCLUSION_SCALE / PARALLAX_OCCLUSION_ITERATIONS;
const float bias = PARALLAX_OCCLUSION_BIAS / PARALLAX_OCCLUSION_ITERATIONS;
-
+
#if PARALLAX_OCCLUSION_MODE == 0
// Parallax occlusion with slope information
if (normalTexturePresent && area_enable_parallax > 0.0) {
float h = normal.a * scale - bias;
uv += h * normal.z * eyeRay;
}
+ }
#endif
#if PARALLAX_OCCLUSION_MODE == 1
// Relief mapping
vec2 ds = eyeRay * PARALLAX_OCCLUSION_SCALE;
float dist = find_intersection(uv, ds);
uv += dist * ds;
-#endif
- } else if (GENERATE_NORMALMAPS == 1 && area_enable_parallax > 0.0) {
- vec2 ds = eyeRay * PARALLAX_OCCLUSION_SCALE;
- float dist = find_intersectionRGB(uv, ds);
- uv += dist * ds;
}
#endif
+#endif
#if USE_NORMALMAPS == 1
if (normalTexturePresent) {
bump = get_normal_map(uv);
use_normalmap = true;
- }
-#endif
-
- 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);
- use_normalmap = true;
}
+#endif
vec4 base = texture2D(baseTexture, uv).rgba;
+#ifdef USE_DISCARD
+ // If alpha is zero, we can just discard the pixel. This fixes transparency
+ // on GPUs like GC7000L, where GL_ALPHA_TEST is not implemented in mesa.
+ if (base.a == 0.0) {
+ discard;
+ }
+#endif
+
#ifdef ENABLE_BUMPMAPPING
if (use_normalmap) {
vec3 L = normalize(lightVec);
color = base.rgb;
#endif
-#if MATERIAL_TYPE == TILE_MATERIAL_LIQUID_TRANSPARENT || MATERIAL_TYPE == TILE_MATERIAL_LIQUID_OPAQUE
- float alpha = gl_Color.a;
- vec4 col = vec4(color.rgb, alpha);
- col *= gl_Color;
- 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);
- }
- gl_FragColor = vec4(col.rgb, alpha);
-#else
- vec4 col = vec4(color.rgb, base.a);
- col *= gl_Color;
- if (fogDistance != 0.0) {
- float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
- col = mix(col, skyBgColor, d);
- }
- gl_FragColor = vec4(col.rgb, base.a);
+ vec4 col = vec4(color.rgb * gl_Color.rgb, 1.0);
+
+#ifdef ENABLE_TONE_MAPPING
+ col = applyToneMapping(col);
#endif
+
+ // Due to a bug in some (older ?) graphics stacks (possibly in the glsl compiler ?),
+ // the fog will only be rendered correctly if the last operation before the
+ // clamp() is an addition. Else, the clamp() seems to be ignored.
+ // E.g. the following won't work:
+ // float clarity = clamp(fogShadingParameter
+ // * (fogDistance - length(eyeVec)) / fogDistance), 0.0, 1.0);
+ // As additions usually come for free following a multiplication, the new formula
+ // should be more efficient as well.
+ // Note: clarity = (1 - fogginess)
+ float clarity = clamp(fogShadingParameter
+ - fogShadingParameter * length(eyeVec) / fogDistance, 0.0, 1.0);
+ col = mix(skyBgColor, col, clarity);
+ col = vec4(col.rgb, base.a);
+
+ gl_FragColor = col;
}
projects / dragonfireclient.git / blobdiff