GameAnimationProject/Draw.cpp at main · peeriscool/GameAnimationProject · GitHub

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#include "Draw.h"
#include "glad.h"
#include <iostream>

static GLenum DrawModeToGLEnum(DrawMode input) {
	if (input == DrawMode::Points) {
		return  GL_POINTS;
	}
	else if (input == DrawMode::LineStrip) {
		return GL_LINE_STRIP;
	}
	else if (input == DrawMode::LineLoop) {
		return  GL_LINE_LOOP;
	}
	else if (input == DrawMode::Lines) {
		return  GL_LINES;
	}
	else if (input == DrawMode::Triangles) {
		return  GL_TRIANGLES;
	}
	else if (input == DrawMode::TriangleStrip) {
		return  GL_TRIANGLE_STRIP;
	}
	else if (input == DrawMode::TriangleFan) {
		return   GL_TRIANGLE_FAN;
	}

	std::cout << "DrawModeToGLEnum unreachable code hit\n";
	return 0;
}

void Draw(IndexBuffer& inIndexBuffer, DrawMode mode) {
	unsigned int handle = inIndexBuffer.GetHandle();
	unsigned int numIndices = inIndexBuffer.Count();

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle);
	glDrawElements(DrawModeToGLEnum(mode), numIndices, GL_UNSIGNED_INT, 0);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}

void Draw(unsigned int vertexCount, DrawMode mode) {
	glDrawArrays(DrawModeToGLEnum(mode), 0, vertexCount);
}

void DrawInstanced(IndexBuffer& inIndexBuffer, DrawMode mode, unsigned int instanceCount) {
	unsigned int handle = inIndexBuffer.GetHandle();
	unsigned int numIndices = inIndexBuffer.Count();

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle);
	glDrawElementsInstanced(DrawModeToGLEnum(mode), numIndices, GL_UNSIGNED_INT, 0, instanceCount);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}

void DrawInstanced(unsigned int vertexCount, DrawMode mode, unsigned int numInstances) {
	glDrawArraysInstanced(DrawModeToGLEnum(mode), 0, vertexCount, numInstances);
}