int tick(float winwidth, float winheight, float pixratio, float seconds)
{
resolution = pixratio * winwidth;
const float RADIANS_PER_SECOND = 3.14;
float theta = seconds * RADIANS_PER_SECOND;
model = M4MakeRotationY(theta);
return 1;
}
void PezUpdate(float seconds)
{
const float RadiansPerSecond = 0.5f;
Globals.Theta += seconds * RadiansPerSecond;
// Create the model-view matrix:
Globals.Transforms.Model = M4MakeRotationY(Globals.Theta);
Point3 eye = {0, 0, 4};
Point3 target = {0, 0, 0};
Vector3 up = {0, 1, 0};
Globals.Transforms.View = M4MakeLookAt(eye, target, up);
Globals.Transforms.Modelview = M4Mul(Globals.Transforms.View, Globals.Transforms.Model);
Globals.Transforms.Normal = M4GetUpper3x3(Globals.Transforms.Modelview);
for (int i = 0; i < 9; ++i) {
Globals.Transforms.PackedNormal[i] = M3GetElem(Globals.Transforms.Normal, i/3, i%3);
}
}
void SetUniforms()
{
glUniformMatrix4fv(u("ViewMatrix"), 1, 0, pf(Scene.ViewMatrix));
glUniformMatrix4fv(u("Projection"), 1, 0, pf(Scene.Projection));
Matrix4 spinMatrix = M4MakeRotationY(Scene.Theta);
Matrix4 scaleMatrix = M4MakeScale(V3MakeFromScalar(2.0f));
Matrix4 modelMatrix = M4Mul(scaleMatrix, spinMatrix);
Matrix4 modelview = M4Mul(Scene.ViewMatrix, modelMatrix);
Matrix3 normalMatrix = M4GetUpper3x3(modelview);
glUniformMatrix4fv(u("ModelMatrix"), 1, 0, pf(modelMatrix));
glUniformMatrix4fv(u("Modelview"), 1, 0, pf(modelview));
glUniformMatrix3fv(u("NormalMatrix"), 1, 0, pf(normalMatrix));
glUniform1f(u("YScale"), YScale);
glUniform1f(u("YOffset"), YOffset);
glUniform4f(u("Color"), 1, 1, 1, 1);
glUniform1f(u("TessLevelInner"), TessLevel);
glUniform1f(u("TessLevelOuter"), TessLevel);
}
void PezRender()
{
#define Instances 7
Matrix4 Model[Instances];
Model[0] = M4MakeRotationY(Globals.Theta);
Model[1] = M4Mul(M4Mul(
M4MakeTranslation((Vector3){0, 0, 0.6}),
M4MakeScale(V3MakeFromScalar(0.25))),
M4MakeRotationX(Pi/2)
);
Model[2] = Model[3] = Model[4] = Model[1];
Model[1] = M4Mul(M4MakeRotationY(Globals.Theta), Model[1]);
Model[2] = M4Mul(M4MakeRotationY(Globals.Theta + Pi/2), Model[2]);
Model[3] = M4Mul(M4MakeRotationY(Globals.Theta - Pi/2), Model[3]);
Model[4] = M4Mul(M4MakeRotationY(Globals.Theta + Pi), Model[4]);
Model[5] = M4Mul(M4Mul(
M4MakeScale(V3MakeFromScalar(0.5)),
M4MakeTranslation((Vector3){0, 1.25, 0})),
M4MakeRotationY(-Globals.Theta)
);
Model[6] = M4Mul(M4Mul(
M4MakeScale(V3MakeFromScalar(0.5)),
M4MakeTranslation((Vector3){0, -1.25, 0})),
M4MakeRotationY(-Globals.Theta)
);
Vector3 LightPosition = {0.5, 0.25, 1.0}; // world space
Vector3 EyePosition = {0, 0, 1}; // world space
Matrix4 MVP[Instances];
Vector3 Lhat[Instances];
Vector3 Hhat[Instances];
for (int i = 0; i < Instances; i++) {
Matrix4 mv = M4Mul(Globals.View, Model[i]);
MVP[i] = M4Mul(Globals.Projection, mv);
Matrix3 m = M3Transpose(M4GetUpper3x3(Model[i]));
Lhat[i] = M3MulV3(m, V3Normalize(LightPosition)); // object space
Vector3 Eye = M3MulV3(m, V3Normalize(EyePosition)); // object space
Hhat[i] = V3Normalize(V3Add(Lhat[i], Eye));
}
int instanceCount = Instances;
MeshPod* mesh = &Globals.Cylinder;
glBindFramebuffer(GL_FRAMEBUFFER, Globals.FboHandle);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glUseProgram(Globals.LitProgram);
glUniform3f(u("SpecularMaterial"), 0.4, 0.4, 0.4);
glUniform4f(u("FrontMaterial"), 0, 0, 1, 1);
glUniform4f(u("BackMaterial"), 0.5, 0.5, 0, 1);
glUniform3fv(u("Hhat"), Instances, &Hhat[0].x);
glUniform3fv(u("Lhat"), Instances, &Lhat[0].x);
glUniformMatrix4fv(u("ModelviewProjection"), Instances, 0, (float*) &MVP[0]);
glBindVertexArray(mesh->FillVao);
glDrawElementsInstanced(GL_TRIANGLES, mesh->FillIndexCount, GL_UNSIGNED_SHORT, 0, instanceCount);
glUseProgram(Globals.SimpleProgram);
glUniform4f(u("Color"), 0, 0, 0, 1);
glUniformMatrix4fv(u("ModelviewProjection"), Instances, 0, (float*) &MVP[0]);
glDepthMask(GL_FALSE);
glBindVertexArray(mesh->LineVao);
glDrawElementsInstanced(GL_LINES, mesh->LineIndexCount, GL_UNSIGNED_SHORT, 0, instanceCount);
glDepthMask(GL_TRUE);
glDisable(GL_DEPTH_TEST);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glUseProgram(Globals.QuadProgram);
glBindTexture(GL_TEXTURE_2D, Globals.FboTexture);
glBindVertexArray(Globals.Grid.FillVao);
glDrawElements(GL_TRIANGLES, Globals.Grid.FillIndexCount, GL_UNSIGNED_SHORT, 0);
if (1) {
glUseProgram(Globals.GridProgram);
glBindVertexArray(Globals.Grid.LineVao);
glDrawElements(GL_LINES, Globals.Grid.LineIndexCount, GL_UNSIGNED_SHORT, 0);
}
glBindTexture(GL_TEXTURE_2D, 0);
}