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99 lines
3.9 KiB
Rust
99 lines
3.9 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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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 https://mozilla.org/MPL/2.0/. */
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use canvas_traits::webgl::GLLimits;
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use sparkle::gl;
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use sparkle::gl::GLenum;
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use sparkle::gl::Gl;
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pub trait GLLimitsDetect {
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fn detect(gl: &Gl) -> Self;
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}
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impl GLLimitsDetect for GLLimits {
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fn detect(gl: &Gl) -> GLLimits {
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let max_vertex_attribs = gl.get_integer(gl::MAX_VERTEX_ATTRIBS);
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let max_tex_size = gl.get_integer(gl::MAX_TEXTURE_SIZE);
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let max_cube_map_tex_size = gl.get_integer(gl::MAX_CUBE_MAP_TEXTURE_SIZE);
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let max_combined_texture_image_units = gl.get_integer(gl::MAX_COMBINED_TEXTURE_IMAGE_UNITS);
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let max_renderbuffer_size = gl.get_integer(gl::MAX_RENDERBUFFER_SIZE);
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let max_texture_image_units = gl.get_integer(gl::MAX_TEXTURE_IMAGE_UNITS);
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let max_vertex_texture_image_units = gl.get_integer(gl::MAX_VERTEX_TEXTURE_IMAGE_UNITS);
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let max_transform_feedback_separate_attribs =
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gl.get_integer(gl::MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS);
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// TODO: better value for this?
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let max_client_wait_timeout_webgl = std::time::Duration::new(1, 0);
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// Based on:
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// https://searchfox.org/mozilla-central/rev/5a744713370ec47969595e369fd5125f123e6d24/dom/canvas/WebGLContextValidate.cpp#523-558
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let (max_fragment_uniform_vectors, max_varying_vectors, max_vertex_uniform_vectors);
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match gl.try_get_integer(gl::MAX_FRAGMENT_UNIFORM_VECTORS) {
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Some(max_vectors) => {
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max_fragment_uniform_vectors = max_vectors;
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max_varying_vectors = gl.get_integer(gl::MAX_VARYING_VECTORS);
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max_vertex_uniform_vectors = gl.get_integer(gl::MAX_VERTEX_UNIFORM_VECTORS);
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},
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None => {
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let max_fragment_uniform_components =
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gl.get_integer(gl::MAX_FRAGMENT_UNIFORM_COMPONENTS);
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let max_vertex_uniform_components =
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gl.get_integer(gl::MAX_VERTEX_UNIFORM_COMPONENTS);
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let max_vertex_output_components = gl
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.try_get_integer(gl::MAX_VERTEX_OUTPUT_COMPONENTS)
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.unwrap_or(0);
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let max_fragment_input_components = gl
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.try_get_integer(gl::MAX_FRAGMENT_INPUT_COMPONENTS)
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.unwrap_or(0);
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let max_varying_components = max_vertex_output_components
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.min(max_fragment_input_components)
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.max(16);
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max_fragment_uniform_vectors = max_fragment_uniform_components / 4;
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max_varying_vectors = max_varying_components / 4;
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max_vertex_uniform_vectors = max_vertex_uniform_components / 4;
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},
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}
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GLLimits {
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max_vertex_attribs,
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max_tex_size,
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max_cube_map_tex_size,
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max_combined_texture_image_units,
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max_fragment_uniform_vectors,
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max_renderbuffer_size,
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max_texture_image_units,
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max_varying_vectors,
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max_vertex_texture_image_units,
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max_vertex_uniform_vectors,
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max_client_wait_timeout_webgl,
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max_transform_feedback_separate_attribs,
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}
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}
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}
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trait GLExt {
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fn try_get_integer(self, parameter: GLenum) -> Option<u32>;
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fn get_integer(self, parameter: GLenum) -> u32;
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}
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impl<'a> GLExt for &'a Gl {
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#[allow(unsafe_code)]
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fn try_get_integer(self, parameter: GLenum) -> Option<u32> {
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let mut value = [0];
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unsafe {
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self.get_integer_v(parameter, &mut value);
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}
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if self.get_error() != gl::NO_ERROR {
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None
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} else {
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Some(value[0] as u32)
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}
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}
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fn get_integer(self, parameter: GLenum) -> u32 {
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self.try_get_integer(parameter).unwrap()
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}
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}
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