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/*
Copyright (c) 2017,2018 Regents of the University of Minnesota.
All Rights Reserved.
See corresponding header file for details.
*/
#include "default_shader.h"
#include "platform.h"
namespace mingfx {
DefaultShader::DefaultShader(bool addDefaultLight) {
for (int i = 0; i < MAX_LIGHTS; i++) {
lightPositions_[3 * i + 0] = 0.0f;
lightPositions_[3 * i + 1] = 0.0f;
lightPositions_[3 * i + 2] = 0.0f;
lightIas_[4 * i + 0] = 0.0f;
lightIas_[4 * i + 1] = 0.0f;
lightIas_[4 * i + 2] = 0.0f;
lightIas_[4 * i + 3] = 0.0f;
lightIds_[4 * i + 0] = 0.0f;
lightIds_[4 * i + 1] = 0.0f;
lightIds_[4 * i + 2] = 0.0f;
lightIds_[4 * i + 3] = 0.0f;
lightIss_[4 * i + 0] = 0.0f;
lightIss_[4 * i + 1] = 0.0f;
lightIss_[4 * i + 2] = 0.0f;
lightIss_[4 * i + 3] = 0.0f;
}
if (addDefaultLight) {
AddLight(LightProperties());
}
}
DefaultShader::~DefaultShader() {
}
void DefaultShader::AddLight(LightProperties light) {
lights_.push_back(light);
update_light_arrays();
}
void DefaultShader::SetLight(int i, LightProperties light) {
lights_[i] = light;
update_light_arrays();
}
void DefaultShader::update_light_arrays() {
DefaultShader::LightProperties defaultlight;
for (int i=0; i<MAX_LIGHTS; i++) {
DefaultShader::LightProperties *light;
if (i < lights_.size()) {
light = &lights_[i];
}
else {
light = &defaultlight;
}
lightPositions_[3*i + 0] = light->position[0];
lightPositions_[3*i + 1] = light->position[1];
lightPositions_[3*i + 2] = light->position[2];
lightIas_[4*i + 0] = light->ambient_intensity[0];
lightIas_[4*i + 1] = light->ambient_intensity[1];
lightIas_[4*i + 2] = light->ambient_intensity[2];
lightIas_[4*i + 3] = light->ambient_intensity[3];
lightIds_[4*i + 0] = light->diffuse_intensity[0];
lightIds_[4*i + 1] = light->diffuse_intensity[1];
lightIds_[4*i + 2] = light->diffuse_intensity[2];
lightIds_[4*i + 3] = light->diffuse_intensity[3];
lightIss_[4*i + 0] = light->specular_intensity[0];
lightIss_[4*i + 1] = light->specular_intensity[1];
lightIss_[4*i + 2] = light->specular_intensity[2];
lightIss_[4*i + 3] = light->specular_intensity[3];
}
}
int DefaultShader::num_lights() {
return (int)lights_.size();
}
DefaultShader::LightProperties DefaultShader::light(int i) {
return lights_[i];
}
void DefaultShader::Init() {
phongShader_.AddVertexShaderFromFile(Platform::FindMinGfxShaderFile("default.vert"));
phongShader_.AddFragmentShaderFromFile(Platform::FindMinGfxShaderFile("default.frag"));
phongShader_.LinkProgram();
}
void DefaultShader::Draw(const Matrix4 &model, const Matrix4 &view, const Matrix4 &projection,
Mesh *mesh, const MaterialProperties &material)
{
UseProgram(model, view, projection, material);
// Draw the mesh using the shader program
mesh->Draw();
StopProgram();
}
void DefaultShader::UseProgram(const Matrix4 &model, const Matrix4 &view, const Matrix4 &projection,
const MaterialProperties &material)
{
if (!phongShader_.initialized()) {
Init();
}
Matrix4 normalMatrix = (view*model).Inverse().Transpose();
for (int i=0; i<lights_.size(); i++) {
Point3 light_in_eye_space = view * lights_[i].position;
lightPositions_[3*i + 0] = light_in_eye_space[0];
lightPositions_[3*i + 1] = light_in_eye_space[1];
lightPositions_[3*i + 2] = light_in_eye_space[2];
}
// Activate the shader program
phongShader_.UseProgram();
// Pass uniforms and textures from C++ to the GPU Shader Program
phongShader_.SetUniform("ModelMatrix", model);
phongShader_.SetUniform("ViewMatrix", view);
phongShader_.SetUniform("ProjectionMatrix", projection);
phongShader_.SetUniform("NormalMatrix", normalMatrix);
phongShader_.SetUniform("NumLights", (int)lights_.size());
phongShader_.SetUniformArray3("LightPositions", lightPositions_, MAX_LIGHTS);
phongShader_.SetUniformArray4("LightIntensitiesAmbient", lightIas_, MAX_LIGHTS);
phongShader_.SetUniformArray4("LightIntensitiesDiffuse", lightIds_, MAX_LIGHTS);
phongShader_.SetUniformArray4("LightIntensitiesSpecular", lightIss_, MAX_LIGHTS);
phongShader_.SetUniform("MatReflectanceAmbient", material.ambient_reflectance);
phongShader_.SetUniform("MatReflectanceDiffuse", material.diffuse_reflectance);
phongShader_.SetUniform("MatReflectanceSpecular", material.specular_reflectance);
phongShader_.SetUniform("MatReflectanceShininess", material.shinniness);
phongShader_.SetUniform("UseSurfaceTexture", material.surface_texture.initialized());
if (material.surface_texture.initialized()) {
phongShader_.BindTexture("SurfaceTexture", material.surface_texture);
}
}
void DefaultShader::StopProgram() {
// Deactivate the shader program
phongShader_.StopProgram();
}
} // end namespace
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