Remove C++11 dependency from ResampleEffect.
[movit] / flat_input.cpp
index 55c65cc..8f24d86 100644 (file)
@@ -11,9 +11,8 @@ using namespace std;
 
 namespace movit {
 
-FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format, GLenum type, unsigned width, unsigned height)
+FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format_in, GLenum type, unsigned width, unsigned height)
        : image_format(image_format),
-          pixel_format(pixel_format),
          type(type),
          pbo(0),
          texture_num(0),
@@ -22,18 +21,44 @@ FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format, GL
          width(width),
          height(height),
          pitch(width),
-         pixel_data(NULL)
+         owns_texture(false),
+         pixel_data(NULL),
+         fixup_swap_rb(false),
+         fixup_red_to_grayscale(false)
 {
        assert(type == GL_FLOAT || type == GL_HALF_FLOAT || type == GL_UNSIGNED_SHORT || type == GL_UNSIGNED_BYTE);
        register_int("output_linear_gamma", &output_linear_gamma);
        register_int("needs_mipmaps", &needs_mipmaps);
+       register_uniform_sampler2d("tex", &uniform_tex);
+
+       // Some types are not supported in all GL versions (e.g. GLES),
+       // and will corrected into the right format in the shader.
+       switch (pixel_format_in) {
+       case FORMAT_BGRA_PREMULTIPLIED_ALPHA:
+               pixel_format = FORMAT_RGBA_PREMULTIPLIED_ALPHA;
+               fixup_swap_rb = true;
+               break;
+       case FORMAT_BGRA_POSTMULTIPLIED_ALPHA:
+               pixel_format = FORMAT_RGBA_POSTMULTIPLIED_ALPHA;
+               fixup_swap_rb = true;
+               break;
+       case FORMAT_BGR:
+               pixel_format = FORMAT_RGB;
+               fixup_swap_rb = true;
+               break;
+       case FORMAT_GRAYSCALE:
+               pixel_format = FORMAT_R;
+               fixup_red_to_grayscale = true;
+               break;
+       default:
+               pixel_format = pixel_format_in;
+               break;
+       }
 }
 
 FlatInput::~FlatInput()
 {
-       if (texture_num != 0) {
-               resource_pool->release_2d_texture(texture_num);
-       }
+       possibly_release_texture();
 }
 
 void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
@@ -41,7 +66,7 @@ void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsi
        glActiveTexture(GL_TEXTURE0 + *sampler_num);
        check_error();
 
-       if (texture_num == 0) {
+       if (texture_num == 0 && (pbo != 0 || pixel_data != NULL)) {
                // Translate the input format to OpenGL's enums.
                GLint internal_format;
                GLenum format;
@@ -50,6 +75,8 @@ void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsi
                                internal_format = GL_R32F;
                        } else if (pixel_format == FORMAT_RG) {
                                internal_format = GL_RG32F;
+                       } else if (pixel_format == FORMAT_RGB) {
+                               internal_format = GL_RGB32F;
                        } else {
                                internal_format = GL_RGBA32F;
                        }
@@ -58,6 +85,8 @@ void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsi
                                internal_format = GL_R16F;
                        } else if (pixel_format == FORMAT_RG) {
                                internal_format = GL_RG16F;
+                       } else if (pixel_format == FORMAT_RGB) {
+                               internal_format = GL_RGB16F;
                        } else {
                                internal_format = GL_RGBA16F;
                        }
@@ -66,30 +95,41 @@ void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsi
                                internal_format = GL_R16;
                        } else if (pixel_format == FORMAT_RG) {
                                internal_format = GL_RG16;
+                       } else if (pixel_format == FORMAT_RGB) {
+                               internal_format = GL_RGB16;
                        } else {
                                internal_format = GL_RGBA16;
                        }
                } else if (output_linear_gamma) {
                        assert(type == GL_UNSIGNED_BYTE);
-                       internal_format = GL_SRGB8_ALPHA8;
+                       if (pixel_format == FORMAT_RGB) {
+                               internal_format = GL_SRGB8;
+                       } else if (pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
+                               internal_format = GL_SRGB8_ALPHA8;
+                       } else {
+                               assert(false);
+                       }
                } else {
                        assert(type == GL_UNSIGNED_BYTE);
-                       internal_format = GL_RGBA8;
+                       if (pixel_format == FORMAT_R) {
+                               internal_format = GL_R8;
+                       } else if (pixel_format == FORMAT_RG) {
+                               internal_format = GL_RG8;
+                       } else if (pixel_format == FORMAT_RGB) {
+                               internal_format = GL_RGB8;
+                       } else {
+                               internal_format = GL_RGBA8;
+                       }
                }
                if (pixel_format == FORMAT_RGB) {
                        format = GL_RGB;
                } else if (pixel_format == FORMAT_RGBA_PREMULTIPLIED_ALPHA ||
                           pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
                        format = GL_RGBA;
-               } else if (pixel_format == FORMAT_BGR) {
-                       format = GL_BGR;
-               } else if (pixel_format == FORMAT_BGRA_PREMULTIPLIED_ALPHA ||
-                          pixel_format == FORMAT_BGRA_POSTMULTIPLIED_ALPHA) {
-                       format = GL_BGRA;
-               } else if (pixel_format == FORMAT_GRAYSCALE) {
-                       format = GL_LUMINANCE;
                } else if (pixel_format == FORMAT_RG) {
                        format = GL_RG;
+               } else if (pixel_format == FORMAT_R) {
+                       format = GL_RED;
                } else {
                        assert(false);
                }
@@ -122,26 +162,36 @@ void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsi
                check_error();
                glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
                check_error();
+               owns_texture = true;
        } else {
                glBindTexture(GL_TEXTURE_2D, texture_num);
                check_error();
        }
 
        // Bind it to a sampler.
-       set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
+       uniform_tex = *sampler_num;
        ++*sampler_num;
 }
 
 string FlatInput::output_fragment_shader()
 {
-       return read_file("flat_input.frag");
+       char buf[256];
+       sprintf(buf, "#define FIXUP_SWAP_RB %d\n#define FIXUP_RED_TO_GRAYSCALE %d\n",
+               fixup_swap_rb, fixup_red_to_grayscale);
+       return buf + read_file("flat_input.frag");
 }
 
 void FlatInput::invalidate_pixel_data()
 {
-       if (texture_num != 0) {
+       possibly_release_texture();
+}
+
+void FlatInput::possibly_release_texture()
+{
+       if (texture_num != 0 && owns_texture) {
                resource_pool->release_2d_texture(texture_num);
                texture_num = 0;
+               owns_texture = false;
        }
 }