From 2c5f2c4b0ea76d1db5f2efb6d630df65f949f053 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Thu, 14 Mar 2013 23:53:54 -0700 Subject: arb_texture_query_lod: Test textureQueryLOD with nearest filtering. v2: Use textureQueryLOD instead of textureQueryLOD. --- .../fs-textureQueryLOD-nearest.shader_test | 192 +++++++++++++++++++++ 1 file changed, 192 insertions(+) create mode 100644 tests/spec/arb_texture_query_lod/execution/fs-textureQueryLOD-nearest.shader_test diff --git a/tests/spec/arb_texture_query_lod/execution/fs-textureQueryLOD-nearest.shader_test b/tests/spec/arb_texture_query_lod/execution/fs-textureQueryLOD-nearest.shader_test new file mode 100644 index 00000000..2c1b62c9 --- /dev/null +++ b/tests/spec/arb_texture_query_lod/execution/fs-textureQueryLOD-nearest.shader_test @@ -0,0 +1,192 @@ +# Create an 8x8 texture with four miplevels, colored red, green, blue, and +# white, respectively. Draw the following: +# +# .0 .2 .4 .5 .6 .8 +# +# miplevel 3 + + + + +# +# miplevel 2 +-+ +-+ +-+ +-+ +# +-+ +-+ +-+ +-+ + + +# +# miplevel 1 +---+ +---+ +---+ +---+ +# |1.0| |1.2| |1.4| |1.5| +-+ +-+ +# +---+ +---+ +---+ +---+ +-+ +-+ +# +# +------+ +------+ +------+ +------+ +# miplevel 0 | 0.0 | | 0.2 | | 0.4 | | 0.5 | +---+ +---+ +# | | | | | | | | |0.6| |0.8| +# +------+ +------+ +------+ +------+ +---+ +---+ +# +# +# The ARB_texture_query_lod spec says: +# +# "The x component of the result vector contains information on the mipmap +# array(s) that would be accessed by a normal texture lookup using the +# same coordinates. If a single level of detail would be accessed, the +# level-of-detail number relative to the base level is returned." +# +# The results of texture() are compared with textureLod() as a sanity check, +# and then the x component of textureQueryLOD() is compared with what we +# calculated to be the LOD when doing nearest filtering. +# +# Since this test uses no LOD-biasing, the base level is 0, and the +# ARB_texture_query_lod spec says: +# +# "The computed level of detail lambda_prime (equation 3.19), relative to +# the base level, is returned in the y component of the result vector." +# +# we also check that the y component returned by textureQueryLOD() is equal +# to the x component. + +[require] +GLSL >= 1.30 +GL_ARB_texture_query_lod + +[fragment shader] +#extension GL_ARB_texture_query_lod : enable +uniform sampler2D tex; +uniform float lod; +void main() +{ + /* The ARB_texture_query_lod spec says that if TEXTURE_MIN_FILTER is set + * to *_MIPMAP_NEAREST that the computed LOD is + * + * ceil(computedLod + 0.5) - 1.0 + * + * which is "round to nearest integer, and round down for 0.5." + */ + float nearest_lod = ceil(lod + 0.5f) - 1.0f; + + vec4 frag1 = texture(tex, gl_TexCoord[0].st); + vec4 frag2 = textureLod(tex, gl_TexCoord[0].st, nearest_lod); + if (frag1 != frag2) { + discard; + } + + vec2 queried_lod = textureQueryLOD(tex, gl_TexCoord[0].st); + if (queried_lod.x != queried_lod.y) { + discard; + } + if (queried_lod.x != nearest_lod) { + discard; + } + + gl_FragColor = frag1; +} + +[vertex shader] +void main() +{ + gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; + gl_TexCoord[0] = gl_MultiTexCoord0; +} + +[test] +ortho +clear color 0 0 0 0 +clear + +uniform int tex 0 +texture miptree 0 + +# Draw the miptree: basic integer LODs. + +texparameter 2D min nearest_mipmap_nearest +texparameter 2D mag nearest + +uniform float lod 0 +draw rect tex 10 10 8 8 0 0 1 1 + +uniform float lod 1 +draw rect tex 10 28 4 4 0 0 1 1 + +uniform float lod 2 +draw rect tex 10 42 2 2 0 0 1 1 + +uniform float lod 3 +draw rect tex 10 54 1 1 0 0 1 1 + +# Fractional LODs: nearest filtering between miplevels + +uniform float lod 0.2 +draw rect tex 28 10 8 8 0 0 1 1 + +uniform float lod 0.4 +draw rect tex 46 10 8 8 0 0 1 1 + +uniform float lod 0.5 +draw rect tex 64 10 8 8 0 0 1 1 + +uniform float lod 0.6 +draw rect tex 82 10 4 4 0 0 1 1 + +uniform float lod 0.8 +draw rect tex 100 10 4 4 0 0 1 1 + +uniform float lod 1.2 +draw rect tex 28 28 4 4 0 0 1 1 + +uniform float lod 1.4 +draw rect tex 46 28 4 4 0 0 1 1 + +uniform float lod 1.5 +draw rect tex 64 28 4 4 0 0 1 1 + +uniform float lod 1.6 +draw rect tex 82 28 2 2 0 0 1 1 + +uniform float lod 1.8 +draw rect tex 100 28 2 2 0 0 1 1 + +uniform float lod 2.2 +draw rect tex 28 42 2 2 0 0 1 1 + +uniform float lod 2.4 +draw rect tex 46 42 2 2 0 0 1 1 + +uniform float lod 2.5 +draw rect tex 64 42 2 2 0 0 1 1 + +uniform float lod 2.6 +draw rect tex 82 42 1 1 0 0 1 1 + +uniform float lod 2.8 +draw rect tex 100 42 1 1 0 0 1 1 + +uniform float lod 3.2 +draw rect tex 28 54 1 1 0 0 1 1 + +uniform float lod 3.4 +draw rect tex 46 54 1 1 0 0 1 1 + +uniform float lod 3.5 +draw rect tex 64 54 1 1 0 0 1 1 + +# Probes: integer LODs +probe rgb 10 10 1.0 0.0 0.0 +probe rgb 10 28 0.0 1.0 0.0 +probe rgb 10 42 0.0 0.0 1.0 +probe rgb 10 54 1.0 1.0 1.0 + +# Probes: nearest filtering +probe rgb 28 10 1.0 0.0 0.0 +probe rgb 46 10 1.0 0.0 0.0 +probe rgb 64 10 1.0 0.0 0.0 + +probe rgb 82 10 0.0 1.0 0.0 +probe rgb 100 10 0.0 1.0 0.0 +probe rgb 28 28 0.0 1.0 0.0 +probe rgb 46 28 0.0 1.0 0.0 +probe rgb 64 28 0.0 1.0 0.0 + +probe rgb 82 28 0.0 0.0 1.0 +probe rgb 100 28 0.0 0.0 1.0 +probe rgb 28 42 0.0 0.0 1.0 +probe rgb 46 42 0.0 0.0 1.0 +probe rgb 64 42 0.0 0.0 1.0 + +probe rgb 82 42 1.0 1.0 1.0 +probe rgb 100 42 1.0 1.0 1.0 +probe rgb 28 54 1.0 1.0 1.0 +probe rgb 46 54 1.0 1.0 1.0 +probe rgb 64 54 1.0 1.0 1.0 -- cgit v1.2.3