// This function does any needed initialization on the rendering
// context.
void SetupRC(void)
{
// Background
glClearColor(0.0f, 0.0f, 0.0f, 1.0f );
// A number of shipping drivers are not conformant to the current OpenGL
// spec and require this. NVidia... in particular. The OpenGL specification
// states that this is always "on", in fact you can't enable or disable it
// anymore. Adding this lines "fixes" this on non-conformant drivers, but
// be aware, if you have a pure core (and working correctly) GL context,
//you should not do this
glEnable(GL_POINT_SPRITE);
GLfloat fColors[4][4] = {{ 1.0f, 1.0f, 1.0f, 1.0f}, // White
{ 0.67f, 0.68f, 0.82f, 1.0f}, // Blue Stars
{ 1.0f, 0.5f, 0.5f, 1.0f}, // Reddish
{ 1.0f, 0.82f, 0.65f, 1.0f}}; // Orange
// Randomly place the stars in their initial positions, and pick a random color
starsBatch.Begin(GL_POINTS, NUM_STARS);
for(int i = 0; i < NUM_STARS; i++)
{
int iColor = 0; // All stars start as white
// One in five will be blue
if(rand() % 5 == 1)
iColor = 1;
// One in 50 red
if(rand() % 50 == 1)
iColor = 2;
// One in 100 is amber
if(rand() % 100 == 1)
iColor = 3;
starsBatch.Color4fv(fColors[iColor]);
M3DVector3f vPosition;
vPosition[0] = float(3000 - (rand() % 6000)) * 0.1f;
vPosition[1] = float(3000 - (rand() % 6000)) * 0.1f;
vPosition[2] = -float(rand() % 1000)-1.0f; // -1 to -1000.0f
starsBatch.Vertex3fv(vPosition);
}
starsBatch.End();
starFieldShader = gltLoadShaderPairWithAttributes(
"vertexSpace.shader","fragmentSpace.shader", 2,
GLT_ATTRIBUTE_VERTEX,"vVertex",
GLT_ATTRIBUTE_COLOR, "vColor");
locMVP = glGetUniformLocation(starFieldShader, "mvpMatrix");
locTexture = glGetUniformLocation(starFieldShader, "starImage");
locTimeStamp = glGetUniformLocation(starFieldShader, "timeStamp");
glGenTextures(1, &starTexture);
glBindTexture(GL_TEXTURE_2D, starTexture);
LoadTGATexture("star.tga", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, GL_CLAMP_TO_EDGE);
}
void MakePyramid(GLBatch& pyramidBatch)
{
pyramidBatch.Begin(GL_TRIANGLES, 18, 1);
// Bottom of pyramid
pyramidBatch.Normal3f(0.0f, -1.0f, 0.0f);
pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f);
pyramidBatch.Vertex3f(-1.0f, -1.0f, -1.0f);
pyramidBatch.Normal3f(0.0f, -1.0f, 0.0f);
pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f);
pyramidBatch.Vertex3f(1.0f, -1.0f, -1.0f);
pyramidBatch.Normal3f(0.0f, -1.0f, 0.0f);
pyramidBatch.MultiTexCoord2f(0, 1.0f, 1.0f);
pyramidBatch.Vertex3f(1.0f, -1.0f, 1.0f);
pyramidBatch.Normal3f(0.0f, -1.0f, 0.0f);
pyramidBatch.MultiTexCoord2f(0, 0.0f, 1.0f);
pyramidBatch.Vertex3f(-1.0f, -1.0f, 1.0f);
pyramidBatch.Normal3f(0.0f, -1.0f, 0.0f);
pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f);
pyramidBatch.Vertex3f(-1.0f, -1.0f, -1.0f);
pyramidBatch.Normal3f(0.0f, -1.0f, 0.0f);
pyramidBatch.MultiTexCoord2f(0, 1.0f, 1.0f);
pyramidBatch.Vertex3f(1.0f, -1.0f, 1.0f);
M3DVector3f vApex = { 0.0f, 1.0f, 0.0f };
M3DVector3f vFrontLeft = { -1.0f, -1.0f, 1.0f };
M3DVector3f vFrontRight = { 1.0f, -1.0f, 1.0f };
M3DVector3f vBackLeft = { -1.0f, -1.0f, -1.0f };
M3DVector3f vBackRight = { 1.0f, -1.0f, -1.0f };
M3DVector3f n;
// Front of Pyramid
m3dFindNormal(n, vApex, vFrontLeft, vFrontRight);
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 0.5f, 1.0f);
pyramidBatch.Vertex3fv(vApex); // Apex
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f);
pyramidBatch.Vertex3fv(vFrontLeft); // Front left corner
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f);
pyramidBatch.Vertex3fv(vFrontRight); // Front right corner
m3dFindNormal(n, vApex, vBackLeft, vFrontLeft);
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 0.5f, 1.0f);
pyramidBatch.Vertex3fv(vApex); // Apex
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f);
pyramidBatch.Vertex3fv(vBackLeft); // Back left corner
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f);
pyramidBatch.Vertex3fv(vFrontLeft); // Front left corner
m3dFindNormal(n, vApex, vFrontRight, vBackRight);
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 0.5f, 1.0f);
pyramidBatch.Vertex3fv(vApex); // Apex
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f);
pyramidBatch.Vertex3fv(vFrontRight); // Front right corner
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f);
pyramidBatch.Vertex3fv(vBackRight); // Back right cornder
m3dFindNormal(n, vApex, vBackRight, vBackLeft);
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 0.5f, 1.0f);
pyramidBatch.Vertex3fv(vApex); // Apex
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 0.0f, 0.0f);
pyramidBatch.Vertex3fv(vBackRight); // Back right cornder
pyramidBatch.Normal3fv(n);
pyramidBatch.MultiTexCoord2f(0, 1.0f, 0.0f);
pyramidBatch.Vertex3fv(vBackLeft); // Back left corner
pyramidBatch.End();
}
void generateCuboidBatch(GLBatch& batch, float length, float width, float height)
{
float halfLength = length / 2;
float halfWidth = width / 2;
float halfHeight = height / 2;
M3DVector3f frontLeftBottom = {-halfLength, -halfHeight, halfWidth};
M3DVector3f frontLeftTop = {-halfLength, halfHeight, halfWidth};
M3DVector3f frontRightBottom = { halfLength, -halfHeight, halfWidth};
M3DVector3f frontRightTop = { halfLength, halfHeight, halfWidth};
M3DVector3f backLeftBottom = {-halfLength, -halfHeight, -halfWidth};
M3DVector3f backLeftTop = {-halfLength, halfHeight, -halfWidth};
M3DVector3f backRightBottom = { halfLength, -halfHeight, -halfWidth};
M3DVector3f backRightTop = { halfLength, halfHeight, -halfWidth};
batch.Begin(GL_QUADS, 24, 1);
// bottom face
batch.Normal3f(0, -1, 0);
batch.MultiTexCoord2f(0, 0, 1);
batch.Vertex3fv(frontLeftBottom);
batch.Normal3f(0, -1, 0);
batch.MultiTexCoord2f(0, 0, 0);
batch.Vertex3fv(backLeftBottom);
batch.Normal3f(0, -1, 0);
batch.MultiTexCoord2f(0, 1, 0);
batch.Vertex3fv(backRightBottom);
batch.Normal3f(0, -1, 0);
batch.MultiTexCoord2f(0, 1, 1);
batch.Vertex3fv(frontRightBottom);
// up face
batch.Normal3f(0, 1, 0);
batch.MultiTexCoord2f(0, 0, 1);
batch.Vertex3fv(frontLeftTop);
batch.Normal3f(0, 1, 0);
batch.MultiTexCoord2f(0, 1, 1);
batch.Vertex3fv(frontRightTop);
batch.Normal3f(0, 1, 0);
batch.MultiTexCoord2f(0, 1, 0);
batch.Vertex3fv(backRightTop);
batch.Normal3f(0, 1, 0);
batch.MultiTexCoord2f(0, 0, 0);
batch.Vertex3fv(backLeftTop);
// front face
batch.Normal3f(0, 0, 1);
batch.MultiTexCoord2f(0, 0, 3);
batch.Vertex3fv(frontLeftTop);
batch.Normal3f(0, 0, 1);
batch.MultiTexCoord2f(0, 0, 0);
batch.Vertex3fv(frontLeftBottom);
batch.Normal3f(0, 0, 1);
batch.MultiTexCoord2f(0, 3, 0);
batch.Vertex3fv(frontRightBottom);
batch.Normal3f(0, 0, 1);
batch.MultiTexCoord2f(0, 3, 3);
batch.Vertex3fv(frontRightTop);
// back face
batch.Normal3f(0, 0, -1);
batch.MultiTexCoord2f(0, 0, 1);
batch.Vertex3fv(backLeftTop);
batch.Normal3f(0, 0, -1);
batch.MultiTexCoord2f(0, 1, 1);
batch.Vertex3fv(backRightTop);
batch.Normal3f(0, 0, -1);
batch.MultiTexCoord2f(0, 1, 0);
batch.Vertex3fv(backRightBottom);
batch.Normal3f(0, 0, -1);
batch.MultiTexCoord2f(0, 0, 0);
batch.Vertex3fv(backLeftBottom);
// left face
batch.Normal3f(-1, 0, 0);
batch.MultiTexCoord2f(0, 0, 3);
batch.Vertex3fv(backLeftTop);
batch.Normal3f(-1, 0, 0);
batch.MultiTexCoord2f(0, 0, 0);
batch.Vertex3fv(backLeftBottom);
batch.Normal3f(-1, 0, 0);
batch.MultiTexCoord2f(0, 3, 0);
batch.Vertex3fv(frontLeftBottom);
batch.Normal3f(-1, 0, 0);
batch.MultiTexCoord2f(0, 3, 3);
batch.Vertex3fv(frontLeftTop);
// right face
batch.Normal3f(1, 0, 0);
batch.MultiTexCoord2f(0, 0, 1);
batch.Vertex3fv(backRightTop);
batch.Normal3f(1, 0, 0);
batch.MultiTexCoord2f(0, 1, 1);
batch.Vertex3fv(frontRightTop);
batch.Normal3f(1, 0, 0);
batch.MultiTexCoord2f(0, 1, 0);
batch.Vertex3fv(frontRightBottom);
batch.Normal3f(1, 0, 0);
batch.MultiTexCoord2f(0, 0, 0);
batch.Vertex3fv(backRightBottom);
batch.End();
}
