libTangerine/examples/simple_mesh/main.cpp

#include <glm/glm.hpp>

#include "dumbLog.h"
#include "mesh.h"
#include "renderer.h"


void
doFrameCallback(render_state* rs)
{
	// NOTE: rotate mesh on z-axis every frame
	entity& e = rs->render_groups[0].entities[0];
	static float angle = (float) M_PI_2 / 33;
	static glm::vec3 axis(0, 0, 1);
	entRotate(e, angle, axis);
}

int
main()
{
	render_state* rs = renInit("simple mesh");

	if (rs == nullptr) {
		LOG(Error) << "Error Initialzing renderer\n";
		return 1;
	}

	// TODO: this needs to be more convenient
	shader_wrapper sw = { SIMPLE_SHADER, nullptr, rs->simple_shader };
	rs->render_groups = renAllocateGroup(1, sw);
	rs->render_group_count = 1;

	entity& e = rs->render_groups[0].entities[0];
	// manually construct a simple mesh
	simple_mesh mesh = { glm::mat4(1), 0, 0, 0 };
	mesh.num_vertices = 4;
	mesh.vertices = UTIL_ALLOC(mesh.num_vertices, glm::vec3);
	mesh.vertices[0] = glm::vec3(-200, 0, 200);
	mesh.vertices[1] = glm::vec3(-200, 0, -200);
	mesh.vertices[2] = glm::vec3(200, 0, -200);
	mesh.vertices[3] = glm::vec3(200, 0, 200);
	mesh.vert_colors = UTIL_ALLOC(mesh.num_vertices, glm::vec3);
	mesh.vert_colors[0] = glm::vec3(255, 0, 0);
	mesh.vert_colors[1] = glm::vec3(255, 0, 0);
	mesh.vert_colors[2] = glm::vec3(255, 0, 0);
	mesh.vert_colors[3] = glm::vec3(255, 0, 0);
	//initialize entity with new mesh
	entInitSimpleMesh(e, mesh, GL_LINE_LOOP);
	utilSafeFree(mesh.vertices);
	utilSafeFree(mesh.vert_colors);

	cameraInitPerspective(
		rs->cam,
		glm::vec3(0, -500, 0),
		glm::vec3(0, 0, 0),
		glm::vec3(0,0,1)
	);

	renDoRenderLoop(rs, 60, doFrameCallback);

	renShutdown(rs);
	return 0;
}