git.sesse.net Git - movit/blob - flat_input.cpp

   1 #include <string.h>
   2 #include <assert.h>
   3 #include <GL/glew.h>
   4
   5 #include "effect_util.h"
   6 #include "flat_input.h"
   7 #include "resource_pool.h"
   8 #include "util.h"
   9
  10 FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format, GLenum type, unsigned width, unsigned height)
  11         : image_format(image_format),
  12           pixel_format(pixel_format),
  13           type(type),
  14           pbo(0),
  15           texture_num(0),
  16           needs_update(false),
  17           finalized(false),
  18           output_linear_gamma(false),
  19           needs_mipmaps(false),
  20           width(width),
  21           height(height),
  22           pitch(width),
  23           pixel_data(NULL)
  24 {
  25         assert(type == GL_FLOAT || type == GL_UNSIGNED_BYTE);
  26         register_int("output_linear_gamma", &output_linear_gamma);
  27         register_int("needs_mipmaps", &needs_mipmaps);
  28 }
  29
  30 FlatInput::~FlatInput()
  31 {
  32         if (texture_num != 0) {
  33                 resource_pool->release_2d_texture(texture_num);
  34         }
  35 }
  36
  37 void FlatInput::finalize()
  38 {
  39         // Translate the input format to OpenGL's enums.
  40         GLenum internal_format;
  41         if (type == GL_FLOAT) {
  42                 internal_format = GL_RGBA32F_ARB;
  43         } else if (output_linear_gamma) {
  44                 assert(type == GL_UNSIGNED_BYTE);
  45                 internal_format = GL_SRGB8_ALPHA8;
  46         } else {
  47                 assert(type == GL_UNSIGNED_BYTE);
  48                 internal_format = GL_RGBA8;
  49         }
  50         if (pixel_format == FORMAT_RGB) {
  51                 format = GL_RGB;
  52         } else if (pixel_format == FORMAT_RGBA_PREMULTIPLIED_ALPHA ||
  53                    pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
  54                 format = GL_RGBA;
  55         } else if (pixel_format == FORMAT_BGR) {
  56                 format = GL_BGR;
  57         } else if (pixel_format == FORMAT_BGRA_PREMULTIPLIED_ALPHA ||
  58                    pixel_format == FORMAT_BGRA_POSTMULTIPLIED_ALPHA) {
  59                 format = GL_BGRA;
  60         } else if (pixel_format == FORMAT_GRAYSCALE) {
  61                 format = GL_LUMINANCE;
  62         } else {
  63                 assert(false);
  64         }
  65
  66         // Create the texture itself.
  67         texture_num = resource_pool->create_2d_texture(internal_format, width, height);
  68         glBindTexture(GL_TEXTURE_2D, texture_num);
  69         check_error();
  70         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
  71         check_error();
  72         glBindTexture(GL_TEXTURE_2D, 0);
  73         check_error();
  74
  75         needs_update = true;
  76         finalized = true;
  77 }
  78
  79 void FlatInput::set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num)
  80 {
  81         glActiveTexture(GL_TEXTURE0 + *sampler_num);
  82         check_error();
  83         glBindTexture(GL_TEXTURE_2D, texture_num);
  84         check_error();
  85         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  86         check_error();
  87
  88         if (needs_update) {
  89                 // Re-upload the texture.
  90                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
  91                 check_error();
  92                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  93                 check_error();
  94                 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
  95                 check_error();
  96                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, pixel_data);
  97                 check_error();
  98                 if (needs_mipmaps) {
  99                         glGenerateMipmap(GL_TEXTURE_2D);
 100                         check_error();
 101                 }
 102                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 103                 check_error();
 104                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 105                 check_error();
 106                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 107                 check_error();
 108                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 109                 check_error();
 110
 111                 needs_update = false;
 112         }
 113
 114         // Bind it to a sampler.
 115         set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
 116         ++*sampler_num;
 117 }
 118
 119 std::string FlatInput::output_fragment_shader()
 120 {
 121         return read_file("flat_input.frag");
 122 }