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Start work on GL state manager object
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8 changed files with 95 additions and 11 deletions
58
include/gl_state.hpp
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58
include/gl_state.hpp
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#pragma once
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#include <type_traits>
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#include "opengl.hpp"
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// GL state manager object for use in the OpenGL GPU renderer and potentially other things in the future (such as a potential ImGui GUI)
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// This object is meant to help us avoid duplicate OpenGL calls (such as binding the same program twice, enabling/disabling a setting twice, etc)
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// by checking if we actually *need* a state change. This is meant to avoid expensive driver calls and minimize unneeded state changes
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// A lot of code is in the header file instead of the relevant source file to make sure stuff gets inlined even without LTO, and
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// because this header should ideally not be getting included in too many places
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// Code that does not need inlining however, like the reset() function should be in gl_state.cpp
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// This state manager may not handle every aspect of OpenGL, in which case anything not handled here should just be manipulated with raw
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// OpenGL/opengl.hpp calls However, anything that can be handled through the state manager should, or at least there should be an attempt to keep it
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// consistent with the current GL state to avoid bugs/suboptimal code.
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// The state manager must *also* be a trivially constructible/destructible type, to ensure that no OpenGL functions get called sneakily without us
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// knowing. This is important for when we want to eg add a Vulkan or misc backend. Would definitely not want to refactor all this. So we try to be as
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// backend-agnostic as possible
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struct GLStateManager {
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bool blendEnabled;
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bool depthEnabled;
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void reset();
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void resetBlend();
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void resetDepth();
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void enableDepth() {
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if (!depthEnabled) {
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depthEnabled = true;
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OpenGL::enableDepth();
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}
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}
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void disableDepth() {
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if (depthEnabled) {
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depthEnabled = false;
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OpenGL::disableDepth();
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}
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}
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void enableBlend() {
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if (!blendEnabled) {
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blendEnabled = true;
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OpenGL::enableBlend();
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}
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}
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void disableBlend() {
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if (blendEnabled) {
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blendEnabled = false;
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OpenGL::disableBlend();
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}
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}
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};
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static_assert(std::is_trivially_constructible<GLStateManager>(), "OpenGL State Manager class is not trivially constructible!");
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static_assert(std::is_trivially_destructible<GLStateManager>(), "OpenGL State Manager class is not trivially destructible!");
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