80e113f67c7f01b5945764c45ca3c18901a573d2
[movit] / flat_input.h
1 #ifndef _FLAT_INPUT_H
2 #define _FLAT_INPUT_H 1
3
4 #include <GL/glew.h>
5 #include <assert.h>
6 #include <string>
7
8 #include "effect.h"
9 #include "image_format.h"
10 #include "init.h"
11 #include "input.h"
12
13 // A FlatInput is the normal, “classic” case of an input, where everything
14 // comes from a single 2D array with chunky pixels.
15 class FlatInput : public Input {
16 public:
17         FlatInput(ImageFormat format, MovitPixelFormat pixel_format, GLenum type, unsigned width, unsigned height);
18         ~FlatInput();
19
20         virtual std::string effect_type_id() const { return "FlatInput"; }
21
22         // Create the texture itself. We cannot do this in the constructor,
23         // because we don't necessarily know all the settings (sRGB texture,
24         // mipmap generation) at that point.
25         void finalize();
26
27         virtual bool can_output_linear_gamma() const {
28                 return (movit_srgb_textures_supported &&
29                         type == GL_UNSIGNED_BYTE &&
30                         (image_format.gamma_curve == GAMMA_LINEAR ||
31                          image_format.gamma_curve == GAMMA_sRGB));
32         }
33         virtual AlphaHandling alpha_handling() const {
34                 switch (pixel_format) {
35                 case FORMAT_RGBA_PREMULTIPLIED_ALPHA:
36                 case FORMAT_BGRA_PREMULTIPLIED_ALPHA:
37                         return INPUT_AND_OUTPUT_PREMULTIPLIED_ALPHA;
38                 case FORMAT_RGBA_POSTMULTIPLIED_ALPHA:
39                 case FORMAT_BGRA_POSTMULTIPLIED_ALPHA:
40                         return OUTPUT_POSTMULTIPLIED_ALPHA;
41                 case FORMAT_RGB:
42                 case FORMAT_BGR:
43                 case FORMAT_GRAYSCALE:
44                         return OUTPUT_BLANK_ALPHA;
45                 default:
46                         assert(false);
47                 }
48         }
49
50         std::string output_fragment_shader();
51
52         // Uploads the texture if it has changed since last time.
53         void set_gl_state(GLuint glsl_program_num, const std::string& prefix, unsigned *sampler_num);
54
55         unsigned get_width() const { return width; }
56         unsigned get_height() const { return height; }
57         Colorspace get_color_space() const { return image_format.color_space; }
58         GammaCurve get_gamma_curve() const { return image_format.gamma_curve; }
59
60         // Tells the input where to fetch the actual pixel data. Note that if you change
61         // this data, you must either call set_pixel_data() again (using the same pointer
62         // is fine), or invalidate_pixel_data(). Otherwise, the texture won't be re-uploaded
63         // on subsequent frames.
64         void set_pixel_data(const unsigned char *pixel_data)
65         {
66                 assert(this->type == GL_UNSIGNED_BYTE);
67                 this->pixel_data = pixel_data;
68                 invalidate_pixel_data();
69         }
70
71         void set_pixel_data(const float *pixel_data)
72         {
73                 assert(this->type == GL_FLOAT);
74                 this->pixel_data = pixel_data;
75                 invalidate_pixel_data();
76         }
77
78         void invalidate_pixel_data()
79         {
80                 needs_update = true;
81         }
82
83         void set_pitch(unsigned pitch) {
84                 assert(!finalized);
85                 this->pitch = pitch;
86         }
87
88 private:
89         ImageFormat image_format;
90         MovitPixelFormat pixel_format;
91         GLenum format, type;
92         GLuint pbo, texture_num;
93         bool needs_update, finalized;
94         int output_linear_gamma, needs_mipmaps;
95         unsigned width, height, pitch, bytes_per_pixel;
96         const void *pixel_data;
97 };
98
99 #endif // !defined(_FLAT_INPUT_H)