mirror of
https://github.com/minetest/minetest.git
synced 2024-12-12 09:23:15 +01:00
115 lines
2.8 KiB
GLSL
115 lines
2.8 KiB
GLSL
uniform sampler2D baseTexture;
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uniform sampler2D normalTexture;
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uniform sampler2D textureFlags;
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uniform vec4 skyBgColor;
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uniform float fogDistance;
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uniform vec3 eyePosition;
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varying vec3 vPosition;
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varying vec3 worldPosition;
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varying vec3 eyeVec;
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varying vec3 lightVec;
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bool normalTexturePresent = false;
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bool texTileableHorizontal = false;
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bool texTileableVertical = false;
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bool texSeamless = false;
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const float e = 2.718281828459;
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const float BS = 10.0;
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void get_texture_flags()
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{
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vec4 flags = texture2D(textureFlags, vec2(0.0, 0.0));
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if (flags.r > 0.5) {
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normalTexturePresent = true;
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}
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if (flags.g > 0.5) {
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texTileableHorizontal = true;
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}
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if (flags.b > 0.5) {
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texTileableVertical = true;
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}
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if (texTileableHorizontal && texTileableVertical) {
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texSeamless = true;
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}
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}
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float intensity(vec3 color)
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{
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return (color.r + color.g + color.b) / 3.0;
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}
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float get_rgb_height(vec2 uv)
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{
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if (texSeamless) {
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return intensity(texture2D(baseTexture, uv).rgb);
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} else {
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return intensity(texture2D(baseTexture, clamp(uv, 0.0, 0.999)).rgb);
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}
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}
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vec4 get_normal_map(vec2 uv)
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{
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vec4 bump = texture2D(normalTexture, uv).rgba;
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bump.xyz = normalize(bump.xyz * 2.0 - 1.0);
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return bump;
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}
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void main(void)
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{
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vec3 color;
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vec4 bump;
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vec2 uv = gl_TexCoord[0].st;
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bool use_normalmap = false;
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get_texture_flags();
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#if USE_NORMALMAPS == 1
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if (normalTexturePresent) {
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bump = get_normal_map(uv);
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use_normalmap = true;
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}
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#endif
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if (GENERATE_NORMALMAPS == 1 && normalTexturePresent == false) {
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float tl = get_rgb_height(vec2(uv.x - SAMPLE_STEP, uv.y + SAMPLE_STEP));
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float t = get_rgb_height(vec2(uv.x - SAMPLE_STEP, uv.y - SAMPLE_STEP));
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float tr = get_rgb_height(vec2(uv.x + SAMPLE_STEP, uv.y + SAMPLE_STEP));
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float r = get_rgb_height(vec2(uv.x + SAMPLE_STEP, uv.y));
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float br = get_rgb_height(vec2(uv.x + SAMPLE_STEP, uv.y - SAMPLE_STEP));
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float b = get_rgb_height(vec2(uv.x, uv.y - SAMPLE_STEP));
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float bl = get_rgb_height(vec2(uv.x -SAMPLE_STEP, uv.y - SAMPLE_STEP));
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float l = get_rgb_height(vec2(uv.x - SAMPLE_STEP, uv.y));
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float dX = (tr + 2.0 * r + br) - (tl + 2.0 * l + bl);
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float dY = (bl + 2.0 * b + br) - (tl + 2.0 * t + tr);
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bump = vec4(normalize(vec3 (dX, dY, NORMALMAPS_STRENGTH)), 1.0);
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use_normalmap = true;
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}
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vec4 base = texture2D(baseTexture, uv).rgba;
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#ifdef ENABLE_BUMPMAPPING
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if (use_normalmap) {
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vec3 L = normalize(lightVec);
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vec3 E = normalize(eyeVec);
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float specular = pow(clamp(dot(reflect(L, bump.xyz), E), 0.0, 1.0), 1.0);
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float diffuse = dot(-E,bump.xyz);
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color = (diffuse + 0.1 * specular) * base.rgb;
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} else {
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color = base.rgb;
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}
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#else
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color = base.rgb;
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#endif
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vec4 col = vec4(color.rgb, base.a);
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col *= gl_Color;
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if (fogDistance != 0.0) {
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float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
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col = mix(col, skyBgColor, d);
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}
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gl_FragColor = vec4(col.rgb, base.a);
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}
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