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webgl: Convert non-raw TexImage sources to the requested format.
The code was returning RGBA8 data from the non-raw sources (HTML canvas elements, JS ImageData, etc.), but we then validated and passed that rgba8 data as if it was whatever format/datatype was specified in TexImage2D/TexSubImage2D, so the pixels would come out as garbage. It would seem like we could just rewrite the passed in format/datatype for the TexImage call to be RGBA/UNSIGNED_BYTE, but that would leave incorrect levels of precision if the internalformat didn't match the format/datatype (and older desktop implementations often ignore the internalformat in choosing their internal format, anyway).
This commit is contained in:
Eric Anholt
parent
2e6eb547a8
commit
57ba1646bc
10 changed files with 70 additions and 34 deletions
1
Cargo.lock
generated
1
Cargo.lock
generated
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@ -2268,6 +2268,7 @@ dependencies = [
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"audio-video-metadata 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"bluetooth_traits 0.0.1",
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"byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"canvas_traits 0.0.1",
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"caseless 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"cmake 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -30,6 +30,7 @@ audio-video-metadata = "0.1.2"
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atomic_refcell = "0.1"
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bitflags = "0.7"
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bluetooth_traits = {path = "../bluetooth_traits"}
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byteorder = "0.5"
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canvas_traits = {path = "../canvas_traits"}
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caseless = "0.1.0"
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cookie = {version = "0.2.5", features = ["serialize-rustc"]}
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@ -2,6 +2,7 @@
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use byteorder::{NativeEndian, WriteBytesExt};
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use canvas_traits::{CanvasCommonMsg, CanvasMsg, byte_swap};
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use core::nonzero::NonZero;
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use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::{self, WebGLContextAttributes};
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@ -364,6 +365,67 @@ impl WebGLRenderingContext {
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true
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}
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/// Translates an image in rgba8 (red in the first byte) format to
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/// the format that was requested of TexImage.
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///
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/// From the WebGL 1.0 spec, 5.14.8:
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///
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/// "The source image data is conceptually first converted to
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/// the data type and format specified by the format and type
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/// arguments, and then transferred to the WebGL
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/// implementation. If a packed pixel format is specified
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/// which would imply loss of bits of precision from the image
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/// data, this loss of precision must occur."
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fn rgba8_image_to_tex_image_data(&self,
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format: TexFormat,
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data_type: TexDataType,
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pixels: Vec<u8>) -> Vec<u8> {
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// hint for vector allocation sizing.
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let pixel_count = pixels.len() / 4;
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match (format, data_type) {
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(TexFormat::RGBA, TexDataType::UnsignedByte) => pixels,
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(TexFormat::RGB, TexDataType::UnsignedByte) => pixels,
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(TexFormat::RGBA, TexDataType::UnsignedShort4444) => {
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let mut rgba4 = Vec::<u8>::with_capacity(pixel_count * 2);
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for rgba8 in pixels.chunks(4) {
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rgba4.write_u16::<NativeEndian>((rgba8[0] as u16 & 0xf0) << 8 |
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(rgba8[1] as u16 & 0xf0) << 4 |
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(rgba8[2] as u16 & 0xf0) |
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(rgba8[3] as u16 & 0xf0) >> 4).unwrap();
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}
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rgba4
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}
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(TexFormat::RGBA, TexDataType::UnsignedShort5551) => {
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let mut rgba5551 = Vec::<u8>::with_capacity(pixel_count * 2);
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for rgba8 in pixels.chunks(4) {
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rgba5551.write_u16::<NativeEndian>((rgba8[0] as u16 & 0xf8) << 8 |
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(rgba8[1] as u16 & 0xf8) << 3 |
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(rgba8[2] as u16 & 0xf8) >> 2 |
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(rgba8[3] as u16) >> 7).unwrap();
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}
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rgba5551
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}
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(TexFormat::RGB, TexDataType::UnsignedShort565) => {
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let mut rgb565 = Vec::<u8>::with_capacity(pixel_count * 2);
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for rgba8 in pixels.chunks(4) {
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rgb565.write_u16::<NativeEndian>((rgba8[0] as u16 & 0xf8) << 8 |
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(rgba8[1] as u16 & 0xfc) << 3 |
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(rgba8[2] as u16 & 0xf8) >> 3).unwrap();
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}
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rgb565
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}
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// Validation should have ensured that we only hit the
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// above cases, but we haven't turned the (format, type)
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// into an enum yet so there's a default case here.
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_ => unreachable!()
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}
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}
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fn get_image_pixels(&self,
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source: Option<ImageDataOrHTMLImageElementOrHTMLCanvasElementOrHTMLVideoElement>)
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-> ImagePixelResult {
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@ -398,10 +460,7 @@ impl WebGLRenderingContext {
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let size = Size2D::new(img.width as i32, img.height as i32);
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// TODO(emilio): Validate that the format argument
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// is coherent with the image.
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//
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// RGB8 should be easy to support too
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// For now Servo's images are all stored as RGBA8 internally.
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let mut data = match img.format {
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PixelFormat::RGBA8 => img.bytes.to_vec(),
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_ => unimplemented!(),
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@ -2690,6 +2749,8 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
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Err(_) => return Ok(()), // NB: The validator sets the correct error for us.
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};
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let pixels = self.rgba8_image_to_tex_image_data(format, data_type, pixels);
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self.tex_image_2d(texture, target, data_type, format,
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level, width, height, border, pixels);
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Ok(())
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@ -2794,6 +2855,8 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
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Err(_) => return Ok(()), // NB: The validator sets the correct error for us.
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};
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let pixels = self.rgba8_image_to_tex_image_data(format, data_type, pixels);
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self.tex_sub_image_2d(texture, target, level, xoffset, yoffset,
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width, height, format, data_type, pixels);
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Ok(())
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@ -32,6 +32,7 @@ extern crate audio_video_metadata;
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#[macro_use]
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extern crate bitflags;
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extern crate bluetooth_traits;
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extern crate byteorder;
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extern crate canvas_traits;
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extern crate caseless;
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extern crate cookie as cookie_rs;
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@ -1,5 +0,0 @@
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[tex-image-and-sub-image-2d-with-image-data-rgb565.html]
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type: testharness
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[WebGL test #0: at (0, 0) expected: 0,255,0,255 was 255,227,0,255]
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expected: FAIL
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@ -1,5 +0,0 @@
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[tex-image-and-sub-image-2d-with-image-data-rgba4444.html]
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type: testharness
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[WebGL test #0: at (0, 0) expected: 0,255,0,255 was 255,255,0,255]
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expected: FAIL
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@ -1,5 +0,0 @@
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[tex-image-and-sub-image-2d-with-image-data-rgba5551.html]
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type: testharness
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[WebGL test #0: at (0, 0) expected: 0,255,0,255 was 255,231,0,255]
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expected: FAIL
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@ -1,5 +0,0 @@
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[tex-image-and-sub-image-2d-with-image-rgb565.html]
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type: testharness
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[WebGL test #0: at (4, 4) expected: 0,255,0 was 255,227,0]
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expected: FAIL
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@ -1,5 +0,0 @@
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[tex-image-and-sub-image-2d-with-image-rgba4444.html]
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type: testharness
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[WebGL test #0: at (4, 4) expected: 0,255,0 was 255,255,0]
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expected: FAIL
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@ -1,5 +0,0 @@
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[tex-image-and-sub-image-2d-with-image-rgba5551.html]
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type: testharness
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[WebGL test #0: at (4, 4) expected: 0,255,0 was 255,231,0]
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expected: FAIL
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