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author | 2019-10-13 13:50:38 +0200 | |
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committer | 2019-10-13 07:50:38 -0400 | |
commit | 0837e7451a84f95c29dbdb9bd6b8b931fee1635d (patch) | |
tree | 626bcbd250a7fbebdf5958a288d2f438d4f9fb5a /3rdparty/bgfx/examples/41-tess/fcull.sh | |
parent | c913ccb59d713ce0b91135520719ac5385e54358 (diff) |
WIP: sync bgfx, bx and bimg with latest upstream (#5723)
* Sync with bgfx upstream revision b91d0b6
* Sync with bx upstream revision d60912b
* Sync with bimg upstream revision bd81f60
* Add astc-codec decoder
* Rename VertexDecl to VertexLayout
* Rename UniformType enum Int1 to Sampler.
* Add NVN stub
* Fix unused-const-variable error on macOS
* Drop redundant explicit language parameters
buildoptions_cpp are only applied to c++ files and buildoptions_objcpp are only
applied to objective c++ files. As such, hardcoding -x offers no benefit while
preventing overrides (such as one needed by 3rdparty/bgfx/src/renderer_vk.cpp on
macOS) from working.
* Re-introduce -x c++ in places where C code is compiled as C++ to prevent clang from throwing a warning
* Build bgfx as Objective-C++ on macOS
It is needed due to included headers
* Enable Direct3D12 and Vulkan bgfx rendering backends
* Enable building of spirv shaders
* Properly escape /c in cmd call
* Comment out dx12 bgfx renderer
* Honor VERBOSE setting during shaders build
* Only invert hlsl shader XYZ_TO_sRGB matrix for opengl
* Add spirv shaders
* OpenGL ES needs transposed matrix too
* Metal needs transposed matrix as well
Diffstat (limited to '3rdparty/bgfx/examples/41-tess/fcull.sh')
-rw-r--r-- | 3rdparty/bgfx/examples/41-tess/fcull.sh | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/3rdparty/bgfx/examples/41-tess/fcull.sh b/3rdparty/bgfx/examples/41-tess/fcull.sh new file mode 100644 index 00000000000..d44280ba23b --- /dev/null +++ b/3rdparty/bgfx/examples/41-tess/fcull.sh @@ -0,0 +1,66 @@ +bool frustumCullingTest(mat4 mvp, vec3 bmin, vec3 bmax); + +struct Frustum +{ + vec4 planes[6]; +}; + +/** + * Extract Frustum Planes from MVP Matrix + * + * Based on "Fast Extraction of Viewing Frustum Planes from the World- + * View-Projection Matrix", by Gil Gribb and Klaus Hartmann. + * This procedure computes the planes of the frustum and normalizes + * them. + */ +void loadFrustum(out Frustum f, mat4 mvp) +{ + for (int i = 0; i < 3; ++i) + { + for (int j = 0; j < 2; ++j) + { + f.planes[i*2+j].x = mtxGetElement(mvp, 0, 3) + (j == 0 ? mtxGetElement(mvp, 0, i) : -mtxGetElement(mvp, 0, i)); + f.planes[i*2+j].y = mtxGetElement(mvp, 1, 3) + (j == 0 ? mtxGetElement(mvp, 1, i) : -mtxGetElement(mvp, 1, i)); + f.planes[i*2+j].z = mtxGetElement(mvp, 2, 3) + (j == 0 ? mtxGetElement(mvp, 2, i) : -mtxGetElement(mvp, 2, i)); + f.planes[i*2+j].w = mtxGetElement(mvp, 3, 3) + (j == 0 ? mtxGetElement(mvp, 3, i) : -mtxGetElement(mvp, 3, i)); + f.planes[i*2+j]*= length(f.planes[i*2+j].xyz); + } + } +} + +/** + * Negative Vertex of an AABB + * + * This procedure computes the negative vertex of an AABB + * given a normal. + * See the View Frustum Culling tutorial @ LightHouse3D.com + * http://www.lighthouse3d.com/tutorials/view-frustum-culling/geometric-approach-testing-boxes-ii/ + */ +vec3 negativeVertex(vec3 bmin, vec3 bmax, vec3 n) +{ + bvec3 b = greaterThan(n, vec3(0.0, 0.0, 0.0)); + return mix(bmin, bmax, b); +} + +/** + * Frustum-AABB Culling Test + * + * This procedure returns true if the AABB is either inside, or in + * intersection with the frustum, and false otherwise. + * The test is based on the View Frustum Culling tutorial @ LightHouse3D.com + * http://www.lighthouse3d.com/tutorials/view-frustum-culling/geometric-approach-testing-boxes-ii/ + */ +bool frustumCullingTest(mat4 mvp, vec3 bmin, vec3 bmax) +{ + float a = 1.0f; + Frustum f; + + loadFrustum(f, mvp); + for (int i = 0; i < 6 && a >= 0.0f; ++i) + { + vec3 n = negativeVertex(bmin, bmax, f.planes[i].xyz); + a = dot(vec4(n, 1.0f), f.planes[i]); + } + + return (a >= 0.0); +} |