5 #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),
23 assert(type == GL_FLOAT || type == GL_UNSIGNED_BYTE);
24 register_int("output_linear_gamma", &output_linear_gamma);
25 register_int("needs_mipmaps", &needs_mipmaps);
28 FlatInput::~FlatInput()
31 glDeleteBuffers(1, &pbo);
34 if (texture_num != 0) {
35 glDeleteTextures(1, &texture_num);
40 void FlatInput::finalize()
42 // Translate the input format to OpenGL's enums.
43 GLenum internal_format;
44 if (type == GL_FLOAT) {
45 internal_format = GL_RGBA16F_ARB;
46 } else if (output_linear_gamma) {
47 assert(type == GL_UNSIGNED_BYTE);
48 internal_format = GL_SRGB8_ALPHA8;
50 assert(type == GL_UNSIGNED_BYTE);
51 internal_format = GL_RGBA8;
53 if (pixel_format == FORMAT_RGB) {
56 } else if (pixel_format == FORMAT_RGBA_PREMULTIPLIED_ALPHA ||
57 pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
60 } else if (pixel_format == FORMAT_BGR) {
63 } else if (pixel_format == FORMAT_BGRA_PREMULTIPLIED_ALPHA ||
64 pixel_format == FORMAT_BGRA_POSTMULTIPLIED_ALPHA) {
67 } else if (pixel_format == FORMAT_GRAYSCALE) {
68 format = GL_LUMINANCE;
73 if (type == GL_FLOAT) {
74 bytes_per_pixel *= sizeof(float);
77 // Create PBO to hold the texture holding the input image, and then the texture itself.
78 glGenBuffers(1, &pbo);
80 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
82 glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, pitch * height * bytes_per_pixel, NULL, GL_STREAM_DRAW);
84 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
87 glGenTextures(1, &texture_num);
89 glBindTexture(GL_TEXTURE_2D, texture_num);
91 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
93 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
95 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
97 // Intel/Mesa seems to have a broken glGenerateMipmap() for non-FBO textures, so do it here
98 // instead of calling glGenerateMipmap().
99 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, needs_mipmaps ? GL_TRUE : GL_FALSE);
101 glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, type, NULL);
103 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
110 void FlatInput::set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num)
112 glActiveTexture(GL_TEXTURE0 + *sampler_num);
114 glBindTexture(GL_TEXTURE_2D, texture_num);
118 // Copy the pixel data into the PBO.
119 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
121 void *mapped_pbo = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY);
122 memcpy(mapped_pbo, pixel_data, pitch * height * bytes_per_pixel);
123 glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB);
126 // Re-upload the texture from the PBO.
127 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
129 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(0));
131 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
133 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
135 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
137 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
140 needs_update = false;
143 // Bind it to a sampler.
144 set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
148 std::string FlatInput::output_fragment_shader()
150 return read_file("flat_input.frag");