#include "scene.h"
#include "ggl.h"
#include "utils.h"
#include "ground.h"

GLuint texture;
glm::mat4 modelMatrix, viewMatrix, projectionMatrix;
Ground ground;
GLint textureLocation;
Shader*shader;
VertexBuffer*vertexbuffer;

void Init() {
	/* 初始化vbo并为vbo赋值 */
	vertexbuffer = new VertexBuffer;
	vertexbuffer->SetSize(3);
	
	vertexbuffer->SetPosition(0, -0.2f, -0.2f, 0.0f);
	vertexbuffer->SetTexcoord(0, 0.0f, 0.0f);
	vertexbuffer->SetColor(0, 1.0f, 1.0f, 1.0f);

	vertexbuffer->SetPosition(1, 0.2f, -0.2f, 0.0f);
	vertexbuffer->SetTexcoord(1, 1.0f, 0.0f);
	vertexbuffer->SetColor(1, 1.0f, 0.0f, 0.0f);

	vertexbuffer->SetPosition(2, 0.0f, 0.2f, 0.0f);
	vertexbuffer->SetTexcoord(2, 0.5f, 1.0f);
	vertexbuffer->SetColor(2, 0.0f, 1.0f, 0.0f);

	/* 初始化 shader */
	shader = new Shader;
	shader->Init("Res/test.vs", "Res/test.fs");

	textureLocation = glGetUniformLocation(shader->mProgram, "U_Texture");

	modelMatrix = glm::translate(0.0f, 0.0f, -0.6f);

	texture = CreateTexture2DFromBMP("Res/test.bmp");

	ground.Init();
}
void SetViewPortSize(float width, float height) {
	projectionMatrix = glm::perspective(60.0f, width / height, 0.1f, 1000.0f);
}
void Draw() {
	float frameTime = GetFrameTime();
	glClearColor(0.1f, 0.4f, 0.6f, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	ground.Draw(viewMatrix, projectionMatrix);

	vertexbuffer->Bind();
	shader->Bind(glm::value_ptr(modelMatrix), glm::value_ptr(viewMatrix), glm::value_ptr(projectionMatrix));
	glBindTexture(GL_TEXTURE_2D, texture);
	glUniform1i(textureLocation, 0);
	glDrawArrays(GL_TRIANGLES, 0, 3);
	vertexbuffer->Unbind();
}