Add OpenGL renderer capability target

src/renderer_gl/opengl_capabilities.cpp

@@ -0,0 +1,53 @@
+#include "renderer_gl/opengl_capabilities.h"
+
+namespace pp::renderer::gl {
+
+namespace {
+
+[[nodiscard]] bool contains(std::string_view text, std::string_view needle) noexcept
+{
+    return text.find(needle) != std::string_view::npos;
+}
+
+}
+
+OpenGlCapabilities detect_opengl_capabilities(
+    std::span<const std::string_view> extensions,
+    OpenGlRuntime runtime) noexcept
+{
+    OpenGlCapabilities capabilities;
+
+    if (runtime.desktop_gl) {
+        capabilities.float32_textures = true;
+        capabilities.float32_linear = true;
+        capabilities.float16_textures = true;
+    }
+
+    for (const auto extension : extensions) {
+        if (contains(extension, "shader_framebuffer_fetch")) {
+            capabilities.framebuffer_fetch = true;
+        }
+
+        if (contains(extension, "map_buffer_alignment")) {
+            capabilities.map_buffer_alignment = true;
+        }
+
+        if (runtime.gles && !runtime.web) {
+            if (contains(extension, "texture_float") || contains(extension, "color_buffer_float")) {
+                capabilities.float32_textures = true;
+            }
+
+            if (contains(extension, "texture_float_linear")) {
+                capabilities.float32_linear = true;
+            }
+
+            if (contains(extension, "texture_half_float") || contains(extension, "color_buffer_half_float")) {
+                capabilities.float16_textures = true;
+            }
+        }
+    }
+
+    return capabilities;
+}
+
+}

src/renderer_gl/opengl_capabilities.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <span>
+#include <string_view>
+
+namespace pp::renderer::gl {
+
+struct OpenGlRuntime {
+    bool desktop_gl = false;
+    bool gles = false;
+    bool web = false;
+};
+
+struct OpenGlCapabilities {
+    bool framebuffer_fetch = false;
+    bool map_buffer_alignment = false;
+    bool float32_textures = false;
+    bool float32_linear = false;
+    bool float16_textures = false;
+};
+
+[[nodiscard]] OpenGlCapabilities detect_opengl_capabilities(
+    std::span<const std::string_view> extensions,
+    OpenGlRuntime runtime) noexcept;
+
+}