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sokol: add screenshot function to OpenGL based backends (#12169)

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Larpon 2021-10-13 20:22:58 +02:00 committed by GitHub
parent 97e999768a
commit 5bfa3d5530
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5 changed files with 64 additions and 2 deletions

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@ -4657,7 +4657,9 @@ _SOKOL_PRIVATE void _sg_dummy_update_image(_sg_image_t* img, const sg_image_data
#if defined(_SOKOL_USE_WIN32_GL_LOADER)
// X Macro list of GL function names and signatures
// __v_ start
#define _SG_GL_FUNCS \
_SG_XMACRO(glReadPixels, void, (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void * data)) \
_SG_XMACRO(glBindVertexArray, void, (GLuint array)) \
_SG_XMACRO(glFramebufferTextureLayer, void, (GLenum target, GLenum attachment, GLuint texture, GLint level, GLint layer)) \
_SG_XMACRO(glGenFramebuffers, void, (GLsizei n, GLuint * framebuffers)) \
@ -4754,6 +4756,7 @@ _SOKOL_PRIVATE void _sg_dummy_update_image(_sg_image_t* img, const sg_image_data
_SG_XMACRO(glGenVertexArrays, void, (GLsizei n, GLuint * arrays)) \
_SG_XMACRO(glFrontFace, void, (GLenum mode)) \
_SG_XMACRO(glCullFace, void, (GLenum mode))
// __v_ end
// generate GL function pointer typedefs
#define _SG_XMACRO(name, ret, args) typedef ret (GL_APIENTRY* PFN_ ## name) args;

9
thirdparty/sokol/sokol_v.post.h vendored Normal file
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@ -0,0 +1,9 @@
#if defined(SOKOL_GLCORE33) || defined(SOKOL_GLES2) || defined(SOKOL_GLES3)
void v_sapp_gl_read_rgba_pixels(int x, int y, int width, int height, unsigned char* pixels) {
glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
}
#else
void v_sapp_gl_read_rgba_pixels(int x, int y, int width, int height, unsigned char* pixels) {
// TODO
}
#endif

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@ -17,4 +17,3 @@
#define printf(...) __android_log_print(ANDROID_LOG_INFO, V_ANDROID_LOG_TAG_NAME, __VA_ARGS__)
#define fprintf(a, ...) __android_log_print(ANDROID_LOG_ERROR, V_ANDROID_LOG_TAG_NAME, __VA_ARGS__)
#endif

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@ -49,10 +49,11 @@ $if gcboehm ? {
#define SOKOL_FREE GC_FREE
}
#include "sokol_v.h"
#include "sokol_v.pre.h"
#include "sokol_app.h"
#define SOKOL_IMPL
#define SOKOL_NO_DEPRECATED
#include "sokol_gfx.h"
#define SOKOL_GL_IMPL
#include "util/sokol_gl.h"
#include "sokol_v.post.h"

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@ -0,0 +1,50 @@
module sapp
import os
// v_sapp_gl_read_rgba_pixels reads pixles from the OpenGL buffer into `pixels`.
fn C.v_sapp_gl_read_rgba_pixels(x int, y int, width int, height int, pixels charptr)
// screenshot takes a screenshot of the current window.
[inline]
pub fn screenshot(path string) ? {
if !path.ends_with('.ppm') {
return error(@MOD + '.' + @FN + ' currently only supports .ppm files.')
}
w := width()
h := height()
size := w * h * 4 //
mut pixels := []byte{len: size, init: 0}
C.v_sapp_gl_read_rgba_pixels(0, 0, w, h, pixels.data)
// TODO use separate thread for writing the data
// TODO use stbi to support more formats
// stbi.write_png(path, w, h, components, pixels.data, 3 * w)
// stbi.write_tga(path, w, h, components, pixels.data)
write_rgba_to_ppm(path, w, h, 4, pixels) ?
unsafe {
pixels.free()
}
}
// write_rgba_to_ppm writes `pixels` data in RGBA format to PPM3 format.
fn write_rgba_to_ppm(path string, w int, h int, components int, pixels []byte) ? {
mut f_out := os.create(path) ?
f_out.writeln('P3') ?
f_out.writeln('$w $h') ?
f_out.writeln('255') ?
for i := h - 1; i >= 0; i-- {
for j := 0; j < w; j++ {
idx := i * w * components + j * components
r := int(pixels[idx])
g := int(pixels[idx + 1])
b := int(pixels[idx + 2])
f_out.write_string('$r $g $b ') ?
}
}
f_out.close()
}