gltut / Tut 09 Lights on / Basic Lighting.cpp

Jason McKesson 2508c7b 



Jason McKesson da7c819 
Jason McKesson 74c4b9b 
Jason McKesson 2508c7b 



























Jason McKesson bb87c5c 

Jason McKesson 2508c7b 













Jason McKesson bb87c5c 


Jason McKesson 2508c7b 









































Jason McKesson bb87c5c 






Jason McKesson 2508c7b 











Jason McKesson 2b423ba 

Jason McKesson 2508c7b 














Jason McKesson bb87c5c 









Jason McKesson 2508c7b 
























































Jason McKesson 748373c 
Jason McKesson 2508c7b 







Jason McKesson 748373c 
Jason McKesson 2508c7b 















Jason McKesson bb87c5c 





Jason McKesson 2508c7b 



























Jason McKesson f314aea 
#include <string>
#include <vector>
#include <stack>
#include <math.h>
#include <stdio.h>
#include <glload/gl_3_3.h>
#include <GL/freeglut.h>
#include "../framework/framework.h"
#include "../framework/Mesh.h"
#include "../framework/MatrixStack.h"
#include "../framework/MousePole.h"
#include "../framework/ObjectPole.h"
#include <glm/glm.hpp>
#include <glm/gtc/type_ptr.hpp>

#define ARRAY_COUNT( array ) (sizeof( array ) / (sizeof( array[0] ) * (sizeof( array ) != sizeof(void*) || sizeof( array[0] ) <= sizeof(void*))))

struct ProgramData
{
	GLuint theProgram;

	GLuint dirToLightUnif;
	GLuint lightIntensityUnif;

	GLuint modelToCameraMatrixUnif;
	GLuint normalModelToCameraMatrixUnif;
};

float g_fzNear = 1.0f;
float g_fzFar = 1000.0f;

ProgramData g_WhiteDiffuseColor;
ProgramData g_VertexDiffuseColor;

const int g_projectionBlockIndex = 2;

ProgramData LoadProgram(const std::string &strVertexShader, const std::string &strFragmentShader)
{
	std::vector<GLuint> shaderList;

	shaderList.push_back(Framework::LoadShader(GL_VERTEX_SHADER, strVertexShader));
	shaderList.push_back(Framework::LoadShader(GL_FRAGMENT_SHADER, strFragmentShader));

	ProgramData data;
	data.theProgram = Framework::CreateProgram(shaderList);
	data.modelToCameraMatrixUnif = glGetUniformLocation(data.theProgram, "modelToCameraMatrix");
	data.normalModelToCameraMatrixUnif = glGetUniformLocation(data.theProgram, "normalModelToCameraMatrix");
	data.dirToLightUnif = glGetUniformLocation(data.theProgram, "dirToLight");
	data.lightIntensityUnif = glGetUniformLocation(data.theProgram, "lightIntensity");

	GLuint projectionBlock = glGetUniformBlockIndex(data.theProgram, "Projection");
	glUniformBlockBinding(data.theProgram, projectionBlock, g_projectionBlockIndex);

	return data;
}

void InitializeProgram()
{
	g_WhiteDiffuseColor = LoadProgram("DirVertexLighting_PN.vert", "ColorPassthrough.frag");
	g_VertexDiffuseColor = LoadProgram("DirVertexLighting_PCN.vert", "ColorPassthrough.frag");
}

Framework::Mesh *g_pCylinderMesh = NULL;
Framework::Mesh *g_pPlaneMesh = NULL;
Framework::RadiusDef radiusDef = {5.0f, 3.0f, 20.0f, 1.5f, 0.5f};

glm::vec3 objectCenter = glm::vec3(0.0f, 0.5f, 0.0f);

Framework::MousePole g_mousePole(objectCenter, radiusDef);
Framework::ObjectPole g_objectPole(objectCenter, &g_mousePole);

namespace
{
	void MouseMotion(int x, int y)
	{
		g_mousePole.GLUTMouseMove(glm::ivec2(x, y));
		g_objectPole.GLUTMouseMove(glm::ivec2(x, y));
		glutPostRedisplay();
	}

	void MouseButton(int button, int state, int x, int y)
	{
		g_mousePole.GLUTMouseButton(button, state, glm::ivec2(x, y));
		g_objectPole.GLUTMouseButton(button, state, glm::ivec2(x, y));
		glutPostRedisplay();
	}

	void MouseWheel(int wheel, int direction, int x, int y)
	{
		g_mousePole.GLUTMouseWheel(direction, glm::ivec2(x, y));
		g_objectPole.GLUTMouseWheel(direction, glm::ivec2(x, y));
		glutPostRedisplay();
	}
}

GLuint g_projectionUniformBuffer = 0;

struct ProjectionBlock
{
	glm::mat4 cameraToClipMatrix;
};

//Called after the window and OpenGL are initialized. Called exactly once, before the main loop.
void init()
{
	InitializeProgram();

	try
	{
		g_pCylinderMesh = new Framework::Mesh("UnitCylinder.xml");
		g_pPlaneMesh = new Framework::Mesh("LargePlane.xml");
	}
	catch(std::exception &except)
	{
		printf("%s\n", except.what());
		throw;
	}

	glutMouseFunc(MouseButton);
	glutMotionFunc(MouseMotion);
	glutMouseWheelFunc(MouseWheel);

	glEnable(GL_CULL_FACE);
	glCullFace(GL_BACK);
	glFrontFace(GL_CW);

	glEnable(GL_DEPTH_TEST);
	glDepthMask(GL_TRUE);
	glDepthFunc(GL_LEQUAL);
	glDepthRange(0.0f, 1.0f);
	glEnable(GL_DEPTH_CLAMP);

	glGenBuffers(1, &g_projectionUniformBuffer);
	glBindBuffer(GL_UNIFORM_BUFFER, g_projectionUniformBuffer);
	glBufferData(GL_UNIFORM_BUFFER, sizeof(ProjectionBlock), NULL, GL_DYNAMIC_DRAW);

	//Bind the static buffers.
	glBindBufferRange(GL_UNIFORM_BUFFER, g_projectionBlockIndex, g_projectionUniformBuffer,
		0, sizeof(ProjectionBlock));

	glBindBuffer(GL_UNIFORM_BUFFER, 0);
}

glm::vec4 g_lightDirection(0.866f, 0.5f, 0.0f, 0.0f);

static bool g_bDrawColoredCyl = true;

//Called to update the display.
//You should call glutSwapBuffers after all of your rendering to display what you rendered.
//If you need continuous updates of the screen, call glutPostRedisplay() at the end of the function.
void display()
{
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
	glClearDepth(1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	if(g_pPlaneMesh && g_pCylinderMesh)
	{
		Framework::MatrixStack modelMatrix;
		modelMatrix.SetMatrix(g_mousePole.CalcMatrix());

		glm::vec4 lightDirCameraSpace = modelMatrix.Top() * g_lightDirection;

		glUseProgram(g_WhiteDiffuseColor.theProgram);
		glUniform3fv(g_WhiteDiffuseColor.dirToLightUnif, 1, glm::value_ptr(lightDirCameraSpace));
		glUseProgram(g_VertexDiffuseColor.theProgram);
		glUniform3fv(g_VertexDiffuseColor.dirToLightUnif, 1, glm::value_ptr(lightDirCameraSpace));
		glUseProgram(0);

		{
			Framework::MatrixStackPusher push(modelMatrix);

			//Render the ground plane.
			{
				Framework::MatrixStackPusher push(modelMatrix);

				glUseProgram(g_WhiteDiffuseColor.theProgram);
				glUniformMatrix4fv(g_WhiteDiffuseColor.modelToCameraMatrixUnif, 1, GL_FALSE, glm::value_ptr(modelMatrix.Top()));
				glm::mat3 normMatrix(modelMatrix.Top());
				glUniformMatrix3fv(g_WhiteDiffuseColor.normalModelToCameraMatrixUnif, 1, GL_FALSE, glm::value_ptr(normMatrix));
				glUniform4f(g_WhiteDiffuseColor.lightIntensityUnif, 1.0f, 1.0f, 1.0f, 1.0f);
				g_pPlaneMesh->Render();
				glUseProgram(0);
			}

			//Render the Cylinder
			{
				Framework::MatrixStackPusher push(modelMatrix);

				modelMatrix.ApplyMatrix(g_objectPole.CalcMatrix());

				if(g_bDrawColoredCyl)
				{
					glUseProgram(g_VertexDiffuseColor.theProgram);
					glUniformMatrix4fv(g_VertexDiffuseColor.modelToCameraMatrixUnif, 1, GL_FALSE, glm::value_ptr(modelMatrix.Top()));
					glm::mat3 normMatrix(modelMatrix.Top());
					glUniformMatrix3fv(g_VertexDiffuseColor.normalModelToCameraMatrixUnif, 1, GL_FALSE, glm::value_ptr(normMatrix));
					glUniform4f(g_VertexDiffuseColor.lightIntensityUnif, 1.0f, 1.0f, 1.0f, 1.0f);
					g_pCylinderMesh->Render("lit-color");
				}
				else
				{
					glUseProgram(g_WhiteDiffuseColor.theProgram);
					glUniformMatrix4fv(g_WhiteDiffuseColor.modelToCameraMatrixUnif, 1, GL_FALSE, glm::value_ptr(modelMatrix.Top()));
					glm::mat3 normMatrix(modelMatrix.Top());
					glUniformMatrix3fv(g_WhiteDiffuseColor.normalModelToCameraMatrixUnif, 1, GL_FALSE, glm::value_ptr(normMatrix));
					glUniform4f(g_WhiteDiffuseColor.lightIntensityUnif, 1.0f, 1.0f, 1.0f, 1.0f);
					g_pCylinderMesh->Render("lit");
				}
				glUseProgram(0);
			}
		}
	}

	glutSwapBuffers();
}

//Called whenever the window is resized. The new window size is given, in pixels.
//This is an opportunity to call glViewport or glScissor to keep up with the change in size.
void reshape (int w, int h)
{
	Framework::MatrixStack persMatrix;
	persMatrix.Perspective(45.0f, (h / (float)w), g_fzNear, g_fzFar);

	ProjectionBlock projData;
	projData.cameraToClipMatrix = persMatrix.Top();

	glBindBuffer(GL_UNIFORM_BUFFER, g_projectionUniformBuffer);
	glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(ProjectionBlock), &projData);
	glBindBuffer(GL_UNIFORM_BUFFER, 0);

	glViewport(0, 0, (GLsizei) w, (GLsizei) h);
	glutPostRedisplay();
}

//Called whenever a key on the keyboard was pressed.
//The key is given by the ''key'' parameter, which is in ASCII.
//It's often a good idea to have the escape key (ASCII value 27) call glutLeaveMainLoop() to 
//exit the program.
void keyboard(unsigned char key, int x, int y)
{
	switch (key)
	{
	case 27:
		delete g_pPlaneMesh;
		delete g_pCylinderMesh;
		glutLeaveMainLoop();
		break;
		
	case 32:
		g_bDrawColoredCyl = !g_bDrawColoredCyl;
		break;
	}

	glutPostRedisplay();
}


unsigned int defaults(unsigned int displayMode, int &width, int &height) {return displayMode;}
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