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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 https://mozilla.org/MPL/2.0/. */
use canvas_traits::webgl::{GLLimits, WebGLVersion};
use sparkle::gl;
use sparkle::gl::GLenum;
use sparkle::gl::Gl;
use sparkle::gl::GlType;
pub trait GLLimitsDetect {
fn detect(gl: &Gl, webgl_version: WebGLVersion) -> Self;
}
impl GLLimitsDetect for GLLimits {
fn detect(gl: &Gl, webgl_version: WebGLVersion) -> GLLimits {
let max_vertex_attribs = gl.get_integer(gl::MAX_VERTEX_ATTRIBS);
let max_tex_size = gl.get_integer(gl::MAX_TEXTURE_SIZE);
let max_cube_map_tex_size = gl.get_integer(gl::MAX_CUBE_MAP_TEXTURE_SIZE);
let max_combined_texture_image_units = gl.get_integer(gl::MAX_COMBINED_TEXTURE_IMAGE_UNITS);
let max_renderbuffer_size = gl.get_integer(gl::MAX_RENDERBUFFER_SIZE);
let max_texture_image_units = gl.get_integer(gl::MAX_TEXTURE_IMAGE_UNITS);
let max_vertex_texture_image_units = gl.get_integer(gl::MAX_VERTEX_TEXTURE_IMAGE_UNITS);
// TODO: better value for this?
let max_client_wait_timeout_webgl = std::time::Duration::new(1, 0);
// Based on:
// https://searchfox.org/mozilla-central/rev/5a744713370ec47969595e369fd5125f123e6d24/dom/canvas/WebGLContextValidate.cpp#523-558
let (
max_fragment_uniform_vectors,
max_varying_vectors,
max_vertex_uniform_vectors,
max_vertex_output_vectors,
max_fragment_input_vectors,
);
if gl.get_type() == GlType::Gles {
max_fragment_uniform_vectors = gl.get_integer(gl::MAX_FRAGMENT_UNIFORM_VECTORS);
max_varying_vectors = gl.get_integer(gl::MAX_VARYING_VECTORS);
max_vertex_uniform_vectors = gl.get_integer(gl::MAX_VERTEX_UNIFORM_VECTORS);
max_vertex_output_vectors = gl
.try_get_integer(gl::MAX_VERTEX_OUTPUT_COMPONENTS)
.map(|c| c / 4)
.unwrap_or(max_varying_vectors);
max_fragment_input_vectors = gl
.try_get_integer(gl::MAX_FRAGMENT_INPUT_COMPONENTS)
.map(|c| c / 4)
.unwrap_or(max_vertex_output_vectors);
} else {
max_fragment_uniform_vectors = gl.get_integer(gl::MAX_FRAGMENT_UNIFORM_COMPONENTS) / 4;
max_vertex_uniform_vectors = gl.get_integer(gl::MAX_VERTEX_UNIFORM_COMPONENTS) / 4;
max_fragment_input_vectors = gl
.try_get_integer(gl::MAX_FRAGMENT_INPUT_COMPONENTS)
.or_else(|| gl.try_get_integer(gl::MAX_VARYING_COMPONENTS))
.map(|c| c / 4)
.unwrap_or_else(|| gl.get_integer(gl::MAX_VARYING_VECTORS));
max_vertex_output_vectors = gl
.try_get_integer(gl::MAX_VERTEX_OUTPUT_COMPONENTS)
.map(|c| c / 4)
.unwrap_or(max_fragment_input_vectors);
max_varying_vectors = max_vertex_output_vectors
.min(max_fragment_input_vectors)
.max(4);
};
let (
max_uniform_buffer_bindings,
min_program_texel_offset,
max_program_texel_offset,
max_transform_feedback_separate_attribs,
max_draw_buffers,
max_color_attachments,
);
if webgl_version == WebGLVersion::WebGL2 {
max_uniform_buffer_bindings = gl.get_integer(gl::MAX_UNIFORM_BUFFER_BINDINGS);
min_program_texel_offset = gl.get_integer(gl::MIN_PROGRAM_TEXEL_OFFSET);
max_program_texel_offset = gl.get_integer(gl::MAX_PROGRAM_TEXEL_OFFSET);
max_transform_feedback_separate_attribs =
gl.get_integer(gl::MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS);
max_color_attachments = gl.get_integer(gl::MAX_COLOR_ATTACHMENTS);
max_draw_buffers = gl
.get_integer(gl::MAX_DRAW_BUFFERS)
.min(max_color_attachments)
} else {
max_uniform_buffer_bindings = 0;
min_program_texel_offset = 0;
max_program_texel_offset = 0;
max_transform_feedback_separate_attribs = 0;
max_color_attachments = 1;
max_draw_buffers = 1;
}
GLLimits {
max_vertex_attribs,
max_tex_size,
max_cube_map_tex_size,
max_combined_texture_image_units,
max_fragment_uniform_vectors,
max_renderbuffer_size,
max_texture_image_units,
max_varying_vectors,
max_vertex_texture_image_units,
max_vertex_uniform_vectors,
max_client_wait_timeout_webgl,
max_transform_feedback_separate_attribs,
max_vertex_output_vectors,
max_fragment_input_vectors,
max_uniform_buffer_bindings,
min_program_texel_offset,
max_program_texel_offset,
max_color_attachments,
max_draw_buffers,
}
}
}
trait GLExt {
fn try_get_integer(self, parameter: GLenum) -> Option<u32>;
fn get_integer(self, parameter: GLenum) -> u32;
}
impl<'a> GLExt for &'a Gl {
#[allow(unsafe_code)]
fn try_get_integer(self, parameter: GLenum) -> Option<u32> {
let mut value = [0];
unsafe {
self.get_integer_v(parameter, &mut value);
}
if self.get_error() != gl::NO_ERROR {
None
} else {
Some(value[0] as u32)
}
}
fn get_integer(self, parameter: GLenum) -> u32 {
self.try_get_integer(parameter).unwrap()
}
}
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