4 #include "flat_input.h"
8 FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format, unsigned width, unsigned height)
9 : image_format(image_format),
10 pixel_format(pixel_format),
13 output_linear_gamma(false),
19 register_int("output_linear_gamma", &output_linear_gamma);
20 register_int("needs_mipmaps", &needs_mipmaps);
23 void FlatInput::finalize()
25 // Translate the input format to OpenGL's enums.
26 GLenum internal_format;
27 if (output_linear_gamma) {
28 internal_format = GL_SRGB8;
30 internal_format = GL_RGBA8;
32 if (pixel_format == FORMAT_RGB) {
35 } else if (pixel_format == FORMAT_RGBA) {
38 } else if (pixel_format == FORMAT_BGR) {
41 } else if (pixel_format == FORMAT_BGRA) {
44 } else if (pixel_format == FORMAT_GRAYSCALE) {
45 format = GL_LUMINANCE;
51 // Create PBO to hold the texture holding the input image, and then the texture itself.
52 glGenBuffers(1, &pbo);
54 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
56 glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, pitch * height * bytes_per_pixel, NULL, GL_STREAM_DRAW);
58 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
61 glGenTextures(1, &texture_num);
63 glBindTexture(GL_TEXTURE_2D, texture_num);
65 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
67 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
69 // Intel/Mesa seems to have a broken glGenerateMipmap() for non-FBO textures, so do it here
70 // instead of calling glGenerateMipmap().
71 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, needs_mipmaps);
73 glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, NULL);
75 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
82 void FlatInput::set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num)
84 glActiveTexture(GL_TEXTURE0 + *sampler_num);
86 glBindTexture(GL_TEXTURE_2D, texture_num);
90 // Copy the pixel data into the PBO.
91 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
93 void *mapped_pbo = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY);
94 memcpy(mapped_pbo, pixel_data, pitch * height * bytes_per_pixel);
95 glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB);
98 // Re-upload the texture from the PBO.
99 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
101 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, GL_UNSIGNED_BYTE, BUFFER_OFFSET(0));
103 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
105 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
107 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
109 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
112 needs_update = false;
115 // Bind it to a sampler.
116 set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
120 std::string FlatInput::output_fragment_shader()
122 return read_file("flat_input.frag");