| // |
| // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| // |
| |
| // Based on Simple_TextureCubemap.c from |
| // Book: OpenGL(R) ES 2.0 Programming Guide |
| // Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner |
| // ISBN-10: 0321502795 |
| // ISBN-13: 9780321502797 |
| // Publisher: Addison-Wesley Professional |
| // URLs: http://safari.informit.com/9780321563835 |
| // http://www.opengles-book.com |
| |
| #include "SampleApplication.h" |
| |
| #include "texture_utils.h" |
| #include "util/geometry_utils.h" |
| #include "util/shader_utils.h" |
| |
| class SimpleTextureCubemapSample : public SampleApplication |
| { |
| public: |
| SimpleTextureCubemapSample(int argc, char **argv) |
| : SampleApplication("SimpleTextureCubemap", argc, argv) |
| {} |
| |
| bool initialize() override |
| { |
| constexpr char kVS[] = R"(attribute vec4 a_position; |
| attribute vec3 a_normal; |
| varying vec3 v_normal; |
| void main() |
| { |
| gl_Position = a_position; |
| v_normal = a_normal; |
| })"; |
| |
| constexpr char kFS[] = R"(precision mediump float; |
| varying vec3 v_normal; |
| uniform samplerCube s_texture; |
| void main() |
| { |
| gl_FragColor = textureCube(s_texture, v_normal); |
| })"; |
| |
| mProgram = CompileProgram(kVS, kFS); |
| if (!mProgram) |
| { |
| return false; |
| } |
| |
| // Get the attribute locations |
| mPositionLoc = glGetAttribLocation(mProgram, "a_position"); |
| mNormalLoc = glGetAttribLocation(mProgram, "a_normal"); |
| |
| // Get the sampler locations |
| mSamplerLoc = glGetUniformLocation(mProgram, "s_texture"); |
| |
| // Load the texture |
| mTexture = CreateSimpleTextureCubemap(); |
| |
| // Generate the geometry data |
| CreateSphereGeometry(128, 0.75f, &mSphere); |
| |
| glClearColor(0.0f, 0.0f, 0.0f, 0.0f); |
| glCullFace(GL_BACK); |
| glEnable(GL_CULL_FACE); |
| |
| return true; |
| } |
| |
| void destroy() override |
| { |
| glDeleteProgram(mProgram); |
| glDeleteTextures(1, &mTexture); |
| } |
| |
| void draw() override |
| { |
| // Set the viewport |
| glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight()); |
| |
| // Clear the color buffer |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| // Use the program object |
| glUseProgram(mProgram); |
| |
| // Load the vertex position |
| glVertexAttribPointer(mPositionLoc, 3, GL_FLOAT, GL_FALSE, 0, mSphere.positions.data()); |
| glEnableVertexAttribArray(mPositionLoc); |
| |
| // Load the normal |
| glVertexAttribPointer(mNormalLoc, 3, GL_FLOAT, GL_FALSE, 0, mSphere.normals.data()); |
| glEnableVertexAttribArray(mNormalLoc); |
| |
| // Bind the texture |
| glActiveTexture(GL_TEXTURE0); |
| glBindTexture(GL_TEXTURE_CUBE_MAP, mTexture); |
| |
| // Set the texture sampler to texture unit to 0 |
| glUniform1i(mSamplerLoc, 0); |
| |
| glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(mSphere.indices.size()), |
| GL_UNSIGNED_SHORT, mSphere.indices.data()); |
| } |
| |
| private: |
| // Handle to a program object |
| GLuint mProgram; |
| |
| // Attribute locations |
| GLint mPositionLoc; |
| GLint mNormalLoc; |
| |
| // Sampler location |
| GLint mSamplerLoc; |
| |
| // Texture handle |
| GLuint mTexture; |
| |
| // Geometry data |
| SphereGeometry mSphere; |
| }; |
| |
| int main(int argc, char **argv) |
| { |
| SimpleTextureCubemapSample app(argc, argv); |
| return app.run(); |
| } |