Try to fix compilation with pre opengl 4 drivers.

src/graphics/post_processing.cpp

@@ -417,12 +417,16 @@ void PostProcessing::renderGaussian17TapBlur(FrameBuffer &in_fbo, FrameBuffer &a
         }
         else
         {
+#if !defined(__linux__) || defined(GL_VERSION_4_2)
             glUseProgram(FullScreenShader::ComputeGaussian17TapHShader::Program);
             glBindImageTexture(0, in_fbo.getRTT()[0], 0, false, 0, GL_READ_ONLY, GL_R16F);
             glBindImageTexture(1, auxiliary.getRTT()[0], 0, false, 0, GL_WRITE_ONLY, GL_R16F);
             glUniform1i(FullScreenShader::ComputeGaussian17TapHShader::uniform_source, 0);
             glUniform1i(FullScreenShader::ComputeGaussian17TapHShader::uniform_dest, 1);
             glDispatchCompute(in_fbo.getWidth() / 8, in_fbo.getHeight() / 8, 1);
+#else
+            assert(false);
+#endif
         }
     }
     {
@@ -443,12 +447,16 @@ void PostProcessing::renderGaussian17TapBlur(FrameBuffer &in_fbo, FrameBuffer &a
         }
         else
         {
+#if !defined(__linux__) || defined(GL_VERSION_4_3)
             glUseProgram(FullScreenShader::ComputeGaussian17TapVShader::Program);
             glBindImageTexture(0, auxiliary.getRTT()[0], 0, false, 0, GL_READ_ONLY, GL_R16F);
             glBindImageTexture(1, in_fbo.getRTT()[0], 0, false, 0, GL_WRITE_ONLY, GL_R16F);
             glUniform1i(FullScreenShader::ComputeGaussian17TapVShader::uniform_source, 0);
             glUniform1i(FullScreenShader::ComputeGaussian17TapVShader::uniform_dest, 1);
             glDispatchCompute(in_fbo.getWidth() / 8, in_fbo.getHeight() / 8, 1);
+#else
+            assert(false);
+#endif
         }
     }
 }

src/graphics/rtts.cpp

@@ -30,7 +30,13 @@ static GLuint generateRTT3D(GLenum target, size_t w, size_t h, size_t d, GLint i
     if (irr_driver->getGLSLVersion() < 420)
         glTexImage3D(target, 0, internalFormat, w, h, d, 0, format, type, 0);
     else
+    {
+#if !defined(__linux__) || defined(GL_VERSION_4_2)
         glTexStorage3D(target, 1, internalFormat, w, h, d);
+#else
+        assert(false);
+#endif
+    }
     return result;
 }
 
@@ -42,7 +48,13 @@ static GLuint generateRTT(const core::dimension2du &res, GLint internalFormat, G
     if (irr_driver->getGLSLVersion() < 420)
         glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, res.Width, res.Height, 0, format, type, 0);
     else
+    {
+#if !defined(__linux__) || defined(GL_VERSION_4_2)
         glTexStorage2D(GL_TEXTURE_2D, mipmaplevel, internalFormat, res.Width, res.Height);
+#else
+        assert(false);
+#endif
+    }
     return result;
 }
 

src/graphics/shaders.cpp

@@ -277,11 +277,15 @@ void Shaders::loadShaders()
     FullScreenShader::DepthOfFieldShader::init();
     FullScreenShader::FogShader::init();
     FullScreenShader::Gaussian17TapHShader::init();
+#if !defined(__linux__) || defined(GL_VERSION_4_3)
     FullScreenShader::ComputeGaussian17TapHShader::init();
+#endif
     FullScreenShader::Gaussian3HBlurShader::init();
     FullScreenShader::Gaussian3VBlurShader::init();
     FullScreenShader::Gaussian17TapVShader::init();
+#if !defined(__linux__) || defined(GL_VERSION_4_3)
     FullScreenShader::ComputeGaussian17TapVShader::init();
+#endif
     FullScreenShader::Gaussian6HBlurShader::init();
     FullScreenShader::Gaussian6VBlurShader::init();
     FullScreenShader::GlowShader::init();
@@ -2441,6 +2445,7 @@ namespace FullScreenShader
         vao = createFullScreenVAO(Program);
     }
 
+#if !defined(__linux__) || defined(GL_VERSION_4_3)
     GLuint ComputeGaussian17TapHShader::Program;
     GLuint ComputeGaussian17TapHShader::uniform_source;
     GLuint ComputeGaussian17TapHShader::uniform_dest;
@@ -2451,7 +2456,7 @@ namespace FullScreenShader
         uniform_source = glGetUniformLocation(Program, "source");
         uniform_dest = glGetUniformLocation(Program, "dest");
     }
-
+#endif
     GLuint Gaussian6HBlurShader::Program;
     GLuint Gaussian6HBlurShader::uniform_tex;
     GLuint Gaussian6HBlurShader::uniform_pixel;
@@ -2497,6 +2502,7 @@ namespace FullScreenShader
     GLuint ComputeGaussian17TapVShader::Program;
     GLuint ComputeGaussian17TapVShader::uniform_source;
     GLuint ComputeGaussian17TapVShader::uniform_dest;
+#if !defined(__linux__) || defined(GL_VERSION_4_3)
     void ComputeGaussian17TapVShader::init()
     {
         Program = LoadProgram(
@@ -2504,7 +2510,7 @@ namespace FullScreenShader
         uniform_source = glGetUniformLocation(Program, "source");
         uniform_dest = glGetUniformLocation(Program, "dest");
     }
-
+#endif
     GLuint Gaussian6VBlurShader::Program;
     GLuint Gaussian6VBlurShader::uniform_tex;
     GLuint Gaussian6VBlurShader::uniform_pixel;