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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// This shader must remain compatible with ESSL 1, at least for the
// WR_FEATURE_TEXTURE_EXTERNAL_ESSL1 feature, so that it can be used to render
// video on GLES devices without GL_OES_EGL_image_external_essl3 support.
// This means we cannot use textureSize(), int inputs/outputs, etc.
#include shared
varying highp vec2 vUv;
flat varying highp vec4 vUvRect;
#ifdef WR_FEATURE_TEXTURE_EXTERNAL_ESSL1
uniform vec2 uTextureSize;
#endif
#ifdef WR_VERTEX_SHADER
PER_INSTANCE attribute vec4 aScaleTargetRect;
PER_INSTANCE attribute vec4 aScaleSourceRect;
void main(void) {
vec2 src_offset = aScaleSourceRect.xy;
vec2 src_size = aScaleSourceRect.zw - aScaleSourceRect.xy;
// If this is in WR_FEATURE_TEXTURE_RECT mode, the rect and size use
// non-normalized texture coordinates.
#ifdef WR_FEATURE_TEXTURE_RECT
vec2 texture_size = vec2(1, 1);
#elif defined(WR_FEATURE_TEXTURE_EXTERNAL_ESSL1)
vec2 texture_size = uTextureSize;
#else
vec2 texture_size = vec2(TEX_SIZE(sColor0));
#endif
// The uvs may be inverted, so use the min and max for the bounds
vUvRect = vec4(min(aScaleSourceRect.xy, aScaleSourceRect.zw) + vec2(0.5),
max(aScaleSourceRect.xy, aScaleSourceRect.zw) - vec2(0.5)) / texture_size.xyxy;
vec2 pos = mix(aScaleTargetRect.xy, aScaleTargetRect.zw, aPosition.xy);
vUv = (src_offset + src_size * aPosition.xy) / texture_size;
gl_Position = uTransform * vec4(pos, 0.0, 1.0);
}
#endif
#ifdef WR_FRAGMENT_SHADER
void main(void) {
vec2 st = clamp(vUv, vUvRect.xy, vUvRect.zw);
oFragColor = TEX_SAMPLE(sColor0, st);
}
#ifdef SWGL_DRAW_SPAN
void swgl_drawSpanRGBA8() {
swgl_commitTextureLinearRGBA8(sColor0, vUv, vUvRect);
}
#endif
#endif
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