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#include <string.h>
#include <assert.h>
#include <epoxy/gl.h>
#include "effect_util.h"
#include "flat_input.h"
#include "resource_pool.h"
#include "util.h"
using namespace std;
namespace movit {
FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format_in, GLenum type, unsigned width, unsigned height)
: image_format(image_format),
type(type),
pbo(0),
texture_num(0),
output_linear_gamma(false),
needs_mipmaps(false),
width(width),
height(height),
pitch(width),
pixel_data(NULL),
fixup_swap_rb(false),
fixup_red_to_grayscale(false)
{
assert(type == GL_FLOAT || type == GL_HALF_FLOAT || type == GL_UNSIGNED_SHORT || type == GL_UNSIGNED_BYTE);
register_int("output_linear_gamma", &output_linear_gamma);
register_int("needs_mipmaps", &needs_mipmaps);
// Some types are not supported in all GL versions (e.g. GLES),
// and will corrected into the right format in the shader.
switch (pixel_format_in) {
case FORMAT_BGRA_PREMULTIPLIED_ALPHA:
pixel_format = FORMAT_RGBA_PREMULTIPLIED_ALPHA;
fixup_swap_rb = true;
break;
case FORMAT_BGRA_POSTMULTIPLIED_ALPHA:
pixel_format = FORMAT_RGBA_POSTMULTIPLIED_ALPHA;
fixup_swap_rb = true;
break;
case FORMAT_BGR:
pixel_format = FORMAT_RGB;
fixup_swap_rb = true;
break;
case FORMAT_GRAYSCALE:
pixel_format = FORMAT_R;
fixup_red_to_grayscale = true;
break;
default:
pixel_format = pixel_format_in;
break;
}
}
FlatInput::~FlatInput()
{
if (texture_num != 0) {
resource_pool->release_2d_texture(texture_num);
}
}
void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
{
glActiveTexture(GL_TEXTURE0 + *sampler_num);
check_error();
if (texture_num == 0) {
// Translate the input format to OpenGL's enums.
GLint internal_format;
GLenum format;
if (type == GL_FLOAT) {
if (pixel_format == FORMAT_R) {
internal_format = GL_R32F;
} else if (pixel_format == FORMAT_RG) {
internal_format = GL_RG32F;
} else if (pixel_format == FORMAT_RGB) {
internal_format = GL_RGB32F;
} else {
internal_format = GL_RGBA32F;
}
} else if (type == GL_HALF_FLOAT) {
if (pixel_format == FORMAT_R) {
internal_format = GL_R16F;
} else if (pixel_format == FORMAT_RG) {
internal_format = GL_RG16F;
} else if (pixel_format == FORMAT_RGB) {
internal_format = GL_RGB16F;
} else {
internal_format = GL_RGBA16F;
}
} else if (type == GL_UNSIGNED_SHORT) {
if (pixel_format == FORMAT_R) {
internal_format = GL_R16;
} else if (pixel_format == FORMAT_RG) {
internal_format = GL_RG16;
} else if (pixel_format == FORMAT_RGB) {
internal_format = GL_RGB16;
} else {
internal_format = GL_RGBA16;
}
} else if (output_linear_gamma) {
assert(type == GL_UNSIGNED_BYTE);
if (pixel_format == FORMAT_RGB) {
internal_format = GL_SRGB8;
} else if (pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
internal_format = GL_SRGB8_ALPHA8;
} else {
assert(false);
}
} else {
assert(type == GL_UNSIGNED_BYTE);
if (pixel_format == FORMAT_R) {
internal_format = GL_R8;
} else if (pixel_format == FORMAT_RG) {
internal_format = GL_RG8;
} else if (pixel_format == FORMAT_RGB) {
internal_format = GL_RGB8;
} else {
internal_format = GL_RGBA8;
}
}
if (pixel_format == FORMAT_RGB) {
format = GL_RGB;
} else if (pixel_format == FORMAT_RGBA_PREMULTIPLIED_ALPHA ||
pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
format = GL_RGBA;
} else if (pixel_format == FORMAT_RG) {
format = GL_RG;
} else if (pixel_format == FORMAT_R) {
format = GL_RED;
} else {
assert(false);
}
// (Re-)upload the texture.
texture_num = resource_pool->create_2d_texture(internal_format, width, height);
glBindTexture(GL_TEXTURE_2D, texture_num);
check_error();
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
check_error();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
check_error();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
check_error();
glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
check_error();
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, pixel_data);
check_error();
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
check_error();
if (needs_mipmaps) {
glGenerateMipmap(GL_TEXTURE_2D);
check_error();
}
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
check_error();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
check_error();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
check_error();
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
check_error();
} else {
glBindTexture(GL_TEXTURE_2D, texture_num);
check_error();
}
// Bind it to a sampler.
set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
++*sampler_num;
}
string FlatInput::output_fragment_shader()
{
char buf[256];
sprintf(buf, "#define FIXUP_SWAP_RB %d\n#define FIXUP_RED_TO_GRAYSCALE %d\n",
fixup_swap_rb, fixup_red_to_grayscale);
return buf + read_file("flat_input.frag");
}
void FlatInput::invalidate_pixel_data()
{
if (texture_num != 0) {
resource_pool->release_2d_texture(texture_num);
texture_num = 0;
}
}
} // namespace movit
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