4 #include "flat_input.h"
8 FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format, GLenum type, unsigned width, unsigned height)
9 : image_format(image_format),
10 pixel_format(pixel_format),
16 output_linear_gamma(false),
22 assert(type == GL_FLOAT || type == GL_UNSIGNED_BYTE);
23 register_int("output_linear_gamma", &output_linear_gamma);
24 register_int("needs_mipmaps", &needs_mipmaps);
27 FlatInput::~FlatInput()
30 glDeleteBuffers(1, &pbo);
33 if (texture_num != 0) {
34 glDeleteTextures(1, &texture_num);
39 void FlatInput::finalize()
41 // Translate the input format to OpenGL's enums.
42 GLenum internal_format;
43 if (type == GL_FLOAT) {
44 internal_format = GL_RGBA16F_ARB;
45 } else if (output_linear_gamma) {
46 assert(type == GL_UNSIGNED_BYTE);
47 internal_format = GL_SRGB8;
49 assert(type == GL_UNSIGNED_BYTE);
50 internal_format = GL_RGBA8;
52 if (pixel_format == FORMAT_RGB) {
55 } else if (pixel_format == FORMAT_RGBA) {
58 } else if (pixel_format == FORMAT_BGR) {
61 } else if (pixel_format == FORMAT_BGRA) {
64 } else if (pixel_format == FORMAT_GRAYSCALE) {
65 format = GL_LUMINANCE;
70 if (type == GL_FLOAT) {
71 bytes_per_pixel *= sizeof(float);
74 // Create PBO to hold the texture holding the input image, and then the texture itself.
75 glGenBuffers(1, &pbo);
77 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
79 glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, pitch * height * bytes_per_pixel, NULL, GL_STREAM_DRAW);
81 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
84 glGenTextures(1, &texture_num);
86 glBindTexture(GL_TEXTURE_2D, texture_num);
88 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
90 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
92 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
94 // Intel/Mesa seems to have a broken glGenerateMipmap() for non-FBO textures, so do it here
95 // instead of calling glGenerateMipmap().
96 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, needs_mipmaps ? GL_TRUE : GL_FALSE);
98 glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, type, NULL);
100 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
107 void FlatInput::set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num)
109 glActiveTexture(GL_TEXTURE0 + *sampler_num);
111 glBindTexture(GL_TEXTURE_2D, texture_num);
115 // Copy the pixel data into the PBO.
116 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
118 void *mapped_pbo = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY);
119 memcpy(mapped_pbo, pixel_data, pitch * height * bytes_per_pixel);
120 glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB);
123 // Re-upload the texture from the PBO.
124 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
126 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(0));
128 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
130 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
132 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
134 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
137 needs_update = false;
140 // Bind it to a sampler.
141 set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
145 std::string FlatInput::output_fragment_shader()
147 return read_file("flat_input.frag");