kc3-lang/angle/samples/mip_map_2d

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• Author : Corentin Wallez
  Date : 2015-05-07 14:50:28
  Hash : 12a8e866
  Message : Make all the samples compile under Linux Two-thirds of them run and work well. BUG=angleproject:892 Change-Id: I401a7ef4fd055eda7276bd34dcf0fc6ae0deff13 Reviewed-on: https://chromium-review.googlesource.com/270124 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>

• MipMap2D.cpp

• //
  // 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 MipMap2D.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 "shader_utils.h"
  #include "texture_utils.h"
  
  class MipMap2DSample : public SampleApplication
  {
    public:
      MipMap2DSample()
          : SampleApplication("MipMap2D", 1280, 720)
      {
      }
  
      virtual bool initialize()
      {
          const std::string vs = SHADER_SOURCE
          (
              uniform float u_offset;
              attribute vec4 a_position;
              attribute vec2 a_texCoord;
              varying vec2 v_texCoord;
              void main()
              {
                  gl_Position = a_position;
                  gl_Position.x += u_offset;
                  v_texCoord = a_texCoord;
              }
          );
  
          const std::string fs = SHADER_SOURCE
          (
              precision mediump float;
              varying vec2 v_texCoord;
              uniform sampler2D s_texture;
              void main()
              {
                  gl_FragColor = texture2D(s_texture, v_texCoord);
              }
          );
  
          mProgram = CompileProgram(vs, fs);
          if (!mProgram)
          {
              return false;
          }
  
          // Get the attribute locations
          mPositionLoc = glGetAttribLocation(mProgram, "a_position");
          mTexCoordLoc = glGetAttribLocation(mProgram, "a_texCoord");
  
          // Get the sampler location
          mSamplerLoc = glGetUniformLocation(mProgram, "s_texture");
  
          // Get the offset location
          mOffsetLoc = glGetUniformLocation(mProgram, "u_offset");
  
          // Load the texture
          mTextureID = CreateMipMappedTexture2D();
  
          // Check Anisotropy limits
          glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &mMaxAnisotropy);
  
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  
          return true;
      }
  
      virtual void destroy()
      {
          glDeleteProgram(mProgram);
          glDeleteTextures(1, &mTextureID);
      }
  
      virtual void draw()
      {
          const GLfloat vertices[] =
          {
              -0.25f,  0.5f, 0.0f, 5.0f, // Position 0
               0.0f,  0.0f,              // TexCoord 0
              -0.25f, -0.5f, 0.0f, 1.0f, // Position 1
               0.0f,  1.0f,              // TexCoord 1
               0.25f, -0.5f, 0.0f, 1.0f, // Position 2
               1.0f,  1.0f,              // TexCoord 2
               0.25f,  0.5f, 0.0f, 5.0f, // Position 3
               1.0f,  0.0f               // TexCoord 3
          };
          const GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
  
          // 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, 4, GL_FLOAT,  GL_FALSE, 6 * sizeof(GLfloat), vertices);
          // Load the texture coordinate
          glVertexAttribPointer(mTexCoordLoc, 2, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), vertices + 4);
  
          glEnableVertexAttribArray(mPositionLoc);
          glEnableVertexAttribArray(mTexCoordLoc);
  
          // Bind the texture
          glActiveTexture(GL_TEXTURE0);
          glBindTexture(GL_TEXTURE_2D, mTextureID);
  
          // Set the sampler texture unit to 0
          glUniform1i(mSamplerLoc, 0);
  
          // Draw quad with nearest sampling
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
          glUniform1f(mOffsetLoc, -0.6f);
          glDrawElements ( GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
  
          // Draw quad with trilinear filtering
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
          glUniform1f(mOffsetLoc, 0.0f);
          glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
  
          // Draw quad with anisotropic filtering
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
          glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, mMaxAnisotropy);
          glUniform1f(mOffsetLoc, 0.6f);
          glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
          glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1.0f);
      }
  
    private:
      // Handle to a program object
      GLuint mProgram;
  
      // Attribute locations
      GLint mPositionLoc;
      GLint mTexCoordLoc;
  
      // Sampler location
      GLint mSamplerLoc;
  
      // Offset location
      GLint mOffsetLoc;
  
      // Texture handle
      GLuint mTextureID;
  
      float mMaxAnisotropy;
  };
  
  int main(int argc, char **argv)
  {
      MipMap2DSample app;
      return app.run();
  }