gl: get version at runtime

librashader-runtime-gl/src/filter_chain.rs

@@ -4,7 +4,7 @@ use crate::framebuffer::{Framebuffer, GlImage, Viewport};
 use crate::quad_render::DrawQuad;
 use crate::render_target::RenderTarget;
 use crate::util;
-use crate::util::{InlineRingBuffer, Texture};
+use crate::util::{gl_get_version, InlineRingBuffer, Texture};
 use crate::error::{FilterChainError, Result};
 
 use gl::types::{GLenum, GLint, GLsizei, GLsizeiptr, GLuint};
@@ -368,7 +368,7 @@ impl FilterChain {
         // initialize passes
         for (index, (config, source, mut reflect)) in passes.into_iter().enumerate() {
             let reflection = reflect.reflect(index, semantics)?;
-            let glsl = reflect.compile(GlVersion::V4_60)?;
+            let glsl = reflect.compile(gl_get_version())?;
 
             let vertex_resources = glsl.context.compiler.vertex.get_shader_resources()?;
 

librashader-runtime-gl/src/util.rs

@@ -1,6 +1,7 @@
 use crate::framebuffer::GlImage;
 use gl::types::{GLenum, GLuint};
 use librashader_common::{FilterMode, Size, WrapMode};
+use librashader_reflect::back::cross::GlVersion;
 
 pub fn calc_miplevel(size: Size<u32>) -> u32 {
     let mut size = std::cmp::max(size.width, size.height);
@@ -87,3 +88,34 @@ pub unsafe fn gl_compile_shader(stage: GLenum, source: &str) -> GLuint {
     }
     shader
 }
+
+pub fn gl_get_version() -> GlVersion {
+    let mut maj_ver = 0;
+    let mut min_ver = 0;
+    unsafe {
+        gl::GetIntegerv(gl::MAJOR_VERSION, &mut maj_ver);
+        gl::GetIntegerv(gl::MINOR_VERSION, &mut min_ver);
+    }
+
+    match maj_ver {
+        3 => match min_ver {
+            3 => GlVersion::V3_30,
+            2 => GlVersion::V1_50,
+            1 => GlVersion::V1_40,
+            0 => GlVersion::V1_30,
+            _ => GlVersion::V1_50,
+        }
+        4 => match min_ver {
+            6 => GlVersion::V4_60,
+            5 => GlVersion::V4_50,
+            4 => GlVersion::V4_40,
+            3 => GlVersion::V4_30,
+            2 => GlVersion::V4_20,
+            1 => GlVersion::V4_10,
+            0 => GlVersion::V4_00,
+            _ => GlVersion::V1_50
+        }
+        _ => GlVersion::V1_50
+    }
+
+}