Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | //This file is automatically rebuilt by the Cesium build process.
export default "uniform sampler2D heights;\n\
uniform sampler2D colors;\n\
\n\
// This material expects heights to be sorted from lowest to highest.\n\
\n\
float getHeight(int idx, float invTexSize)\n\
{\n\
vec2 uv = vec2((float(idx) + 0.5) * invTexSize, 0.5);\n\
#ifdef OES_texture_float\n\
return texture(heights, uv).x;\n\
#else\n\
return czm_unpackFloat(texture(heights, uv));\n\
#endif\n\
}\n\
\n\
czm_material czm_getMaterial(czm_materialInput materialInput)\n\
{\n\
czm_material material = czm_getDefaultMaterial(materialInput);\n\
\n\
float height = materialInput.height;\n\
float invTexSize = 1.0 / float(heightsDimensions.x);\n\
\n\
float minHeight = getHeight(0, invTexSize);\n\
float maxHeight = getHeight(heightsDimensions.x - 1, invTexSize);\n\
\n\
// early-out when outside the height range\n\
if (height < minHeight || height > maxHeight) {\n\
material.diffuse = vec3(0.0);\n\
material.alpha = 0.0;\n\
return material;\n\
}\n\
\n\
// Binary search to find heights above and below.\n\
int idxBelow = 0;\n\
int idxAbove = heightsDimensions.x;\n\
float heightBelow = minHeight;\n\
float heightAbove = maxHeight;\n\
\n\
// while loop not allowed, so use for loop with max iterations.\n\
// maxIterations of 16 supports a texture size up to 65536 (2^16).\n\
const int maxIterations = 16;\n\
for (int i = 0; i < maxIterations; i++) {\n\
if (idxBelow >= idxAbove - 1) {\n\
break;\n\
}\n\
\n\
int idxMid = (idxBelow + idxAbove) / 2;\n\
float heightTex = getHeight(idxMid, invTexSize);\n\
\n\
if (height > heightTex) {\n\
idxBelow = idxMid;\n\
heightBelow = heightTex;\n\
} else {\n\
idxAbove = idxMid;\n\
heightAbove = heightTex;\n\
}\n\
}\n\
\n\
float lerper = heightBelow == heightAbove ? 1.0 : (height - heightBelow) / (heightAbove - heightBelow);\n\
vec2 colorUv = vec2(invTexSize * (float(idxBelow) + 0.5 + lerper), 0.5);\n\
vec4 color = texture(colors, colorUv);\n\
\n\
// undo preumultiplied alpha\n\
if (color.a > 0.0) \n\
{\n\
color.rgb /= color.a;\n\
}\n\
\n\
color.rgb = czm_gammaCorrect(color.rgb);\n\
\n\
material.diffuse = color.rgb;\n\
material.alpha = color.a;\n\
return material;\n\
}\n\
";
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