130 lines
3.9 KiB
C++
130 lines
3.9 KiB
C++
#include "SkyBox.h"
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#include "Shader.h"
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#include <glad/glad.h>
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#include <stb_image.h>
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#include <glm/gtc/type_ptr.hpp>
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using namespace std;
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SkyBox::SkyBox() :
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textureId(GL_INVALID_INDEX), programId(GL_INVALID_INDEX), textureLoc(-1) {
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}
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SkyBox::~SkyBox() {
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glDeleteTextures(1, &textureId);
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}
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bool SkyBox::Load(const std::string basename) {
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glGenTextures(1, &textureId);
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float extent = 10;
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mesh.positions.clear();
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mesh.positions.push_back(glm::vec3(-extent, -extent, -extent));
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mesh.positions.push_back(glm::vec3(-extent, -extent, extent));
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mesh.positions.push_back(glm::vec3(extent, -extent, extent));
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mesh.positions.push_back(glm::vec3(extent, -extent, -extent));
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mesh.positions.push_back(glm::vec3(-extent, extent, -extent));
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mesh.positions.push_back(glm::vec3(-extent, extent, extent));
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mesh.positions.push_back(glm::vec3(extent, extent, extent));
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mesh.positions.push_back(glm::vec3(extent, extent, -extent));
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mesh.indices.clear();
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// bottom
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mesh.indices.push_back(glm::uvec3(1, 0, 2));
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mesh.indices.push_back(glm::uvec3(2, 0, 3));
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// back
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mesh.indices.push_back(glm::uvec3(5, 2, 6));
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mesh.indices.push_back(glm::uvec3(1, 2, 5));
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// front
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mesh.indices.push_back(glm::uvec3(3, 4, 7));
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mesh.indices.push_back(glm::uvec3(3, 0, 4));
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// left
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mesh.indices.push_back(glm::uvec3(6, 3, 7));
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mesh.indices.push_back(glm::uvec3(2, 3, 6));
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// right
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mesh.indices.push_back(glm::uvec3(0, 1, 4));
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mesh.indices.push_back(glm::uvec3(4, 1, 5));
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// top
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mesh.indices.push_back(glm::uvec3(5, 6, 4));
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mesh.indices.push_back(glm::uvec3(6, 7, 4));
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glBindTexture(GL_TEXTURE_CUBE_MAP, textureId);
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Load(GL_TEXTURE_CUBE_MAP_POSITIVE_X, "assets/textures/" + basename + "_right1.jpg");
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Load(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, "assets/textures/" + basename + "_left2.jpg");
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Load(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, "assets/textures/" + basename + "_top3.jpg");
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Load(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, "assets/textures/" + basename + "_bottom4.jpg");
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Load(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, "assets/textures/" + basename + "_front5.jpg");
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Load(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, "assets/textures/" + basename + "_back6.jpg");
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programId = loadProgram("skybox");
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GLCK(textureLoc = glGetAttribLocation(programId, "tCubemap"))
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GLCK(MVPloc = glGetUniformLocation(programId, "MVP"))
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glMesh.create();
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glMesh.update(programId);
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glMesh.upload(mesh);
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return true;
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}
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bool SkyBox::Load(GLuint target, const std::string filename) {
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int x, y, comp;
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printf ("start\n");
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unsigned char *data = stbi_load(filename.c_str(), &x, &y, &comp, 0);
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printf ("end\n");
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glTexImage2D(target, 0, GL_RGB, x, y, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S,
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GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T,
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GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R,
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GL_CLAMP_TO_EDGE);
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stbi_image_free(data);
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return true;
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}
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void SkyBox::Render(glm::mat4 mvp) {
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GLint OldCullFaceMode;
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glGetIntegerv(GL_CULL_FACE_MODE, &OldCullFaceMode);
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GLint OldDepthFuncMode;
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glGetIntegerv(GL_DEPTH_FUNC, &OldDepthFuncMode);
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glCullFace(GL_FRONT);
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glDepthFunc(GL_LEQUAL);
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/*
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Pipeline p;
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p.Scale(20.0f, 20.0f, 20.0f);
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p.Rotate(0.0f, 0.0f, 0.0f);
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p.WorldPos(m_pCamera->GetPos().x, m_pCamera->GetPos().y,
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m_pCamera->GetPos().z);
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p.SetCamera(m_pCamera->GetPos(), m_pCamera->GetTarget(),
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m_pCamera->GetUp());
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p.SetPerspectiveProj(m_persProjInfo);
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m_pSkyboxTechnique->SetWVP(p.GetWVPTrans());
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m_pCubemapTex->Bind(GL_TEXTURE0);
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*/
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GLCK(glUseProgram(programId));
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mvp[3] = glm::vec4(0, 0, 0, 1);
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GLCK(glUniformMatrix4fv(MVPloc, 1, GL_FALSE, glm::value_ptr(mvp)))
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GLCK(glUniform1i(textureLoc, 0))
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GLCK(glActiveTexture(GL_TEXTURE0))
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GLCK(glBindTexture(GL_TEXTURE_CUBE_MAP, textureId))
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glMesh.render();
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glCullFace(OldCullFaceMode);
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glDepthFunc(OldDepthFuncMode);
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}
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