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gsk: Support flipping gl textures

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Add upside-down flipping to the list of supported
conversions when handling GL textures.
This commit is contained in:
Matthias Clasen
2022-05-08 14:47:45 -04:00
parent 3d52678635
commit 13cdd37aa6
2 changed files with 11 additions and 9 deletions
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1
gsk/gl/gskglcommandqueueprivate.h
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@@ -284,6 +284,7 @@ void gsk_gl_command_queue_execute (GskGLCommandQueue
typedef enum {
GSK_CONVERSION_LINEARIZE = 1 << 0,
GSK_CONVERSION_PREMULTIPLY = 1 << 1,
GSK_CONVERSION_FLIP = 1 << 2,
} GskConversion;
int gsk_gl_command_queue_upload_texture (GskGLCommandQueue *self,

19
gsk/gl/gskgldriver.c
View File

@@ -686,17 +686,18 @@ gsk_gl_driver_cache_texture (GskGLDriver *self,
}
static void
draw_offscreen (GskGLCommandQueue *command_queue,
float min_x,
float min_y,
float max_x,
float max_y)
draw_rect (GskGLCommandQueue *command_queue,
float min_x,
float min_y,
float max_x,
float max_y,
gboolean flip)
{
GskGLDrawVertex *vertices = gsk_gl_command_queue_add_vertices (command_queue);
float min_u = 0;
float min_v = 1;
float max_u = 1;
float max_v = 0;
float min_v = flip ? 0 : 1;
float max_v = flip ? 1 : 0;
guint16 c[4] = { FP16_ZERO, FP16_ZERO, FP16_ZERO, FP16_ZERO };
vertices[0] = (GskGLDrawVertex) { .position = { min_x, min_y }, .uv = { min_u, min_v }, .color = { c[0], c[1], c[2
@@ -778,7 +779,7 @@ gsk_gl_driver_convert_texture (GskGLDriver *self,
int prev_fbo;
GskGLProgram *program;
if (conversion == (GSK_CONVERSION_LINEARIZE | GSK_CONVERSION_PREMULTIPLY))
if ((conversion & (GSK_CONVERSION_LINEARIZE | GSK_CONVERSION_PREMULTIPLY)) == (GSK_CONVERSION_LINEARIZE | GSK_CONVERSION_PREMULTIPLY))
program = self->linearize_premultiply_no_clip;
else if (conversion & GSK_CONVERSION_LINEARIZE)
program = self->linearize_no_clip;
@@ -810,7 +811,7 @@ gsk_gl_driver_convert_texture (GskGLDriver *self,
UNIFORM_SHARED_SOURCE, 0,
GL_TEXTURE_2D, GL_TEXTURE0, texture_id);
draw_offscreen (self->command_queue, 0, 0, width, height);
draw_rect (self->command_queue, 0, 0, width, height, (conversion & GSK_CONVERSION_FLIP) != 0);
gsk_gl_command_queue_end_draw (self->command_queue);