47 lines
1.8 KiB
GLSL
47 lines
1.8 KiB
GLSL
#line 2
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/*
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* Copyright (c) 2023 lax1dude. All Rights Reserved.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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precision lowp int;
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precision highp float;
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precision highp sampler2D;
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in vec2 v_position2f;
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layout(location = 0) out float exposureOut1f;
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uniform sampler2D u_inputTexture;
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uniform vec4 u_sampleOffset4f;
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#ifdef CALCULATE_LUMINANCE
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#define TAKE_SAMPLE(samplerIn, posIn) dot(textureLod(samplerIn, posIn, 0.0).rgb, vec3(0.299, 0.587, 0.114))
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#else
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#define TAKE_SAMPLE(samplerIn, posIn) textureLod(samplerIn, posIn, 0.0).r
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#endif
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void main() {
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vec2 pixelPos = floor(v_position2f / u_sampleOffset4f.xy);
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float a = min(TAKE_SAMPLE(u_inputTexture, (pixelPos + vec2(0.25, 0.25)) * u_sampleOffset4f.zw), 250.0);
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a += min(TAKE_SAMPLE(u_inputTexture, (pixelPos + vec2(0.75, 0.25)) * u_sampleOffset4f.zw), 250.0);
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a += min(TAKE_SAMPLE(u_inputTexture, (pixelPos + vec2(0.75, 0.75)) * u_sampleOffset4f.zw), 250.0);
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a += min(TAKE_SAMPLE(u_inputTexture, (pixelPos + vec2(0.25, 0.75)) * u_sampleOffset4f.zw), 250.0);
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exposureOut1f = a * 0.25;
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}
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