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viewport: consistently use floats for viewports

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OpenGL < 4.0 only supports integer based viewports and internally we
have a mixture of code using floats and integers for viewports. This
patch switches all viewports throughout clutter and cogl to be
represented using floats considering that in the future we may want to
take advantage of floating point viewports with modern hardware/drivers.
This commit is contained in:
Robert Bragg
2011-02-01 16:51:58 +00:00
parent b3d9f313d4
commit bc372d2734
8 changed files with 39 additions and 44 deletions
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23
cogl/cogl-framebuffer.c
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@ -499,10 +499,10 @@ _cogl_framebuffer_set_clip_stack (CoglFramebuffer *framebuffer,
void
_cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
int x,
int y,
int width,
int height)
float x,
float y,
float width,
float height)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
@ -523,32 +523,33 @@ _cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
ctx->dirty_gl_viewport = TRUE;
}
int
float
_cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer)
{
return framebuffer->viewport_x;
}
int
float
_cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer)
{
return framebuffer->viewport_y;
}
int
float
_cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer)
{
return framebuffer->viewport_width;
}
int
float
_cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer)
{
return framebuffer->viewport_height;
}
void
_cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer, int *viewport)
_cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
float *viewport)
{
viewport[0] = framebuffer->viewport_x;
viewport[1] = framebuffer->viewport_y;
@ -1290,7 +1291,7 @@ _cogl_framebuffer_flush_state (CoglFramebuffer *draw_buffer,
if (ctx->dirty_gl_viewport)
{
int gl_viewport_y;
float gl_viewport_y;
/* Convert the Cogl viewport y offset to an OpenGL viewport y offset
* NB: OpenGL defines its window and viewport origins to be bottom
@ -1303,7 +1304,7 @@ _cogl_framebuffer_flush_state (CoglFramebuffer *draw_buffer,
gl_viewport_y = draw_buffer->height -
(draw_buffer->viewport_y + draw_buffer->viewport_height);
COGL_NOTE (OPENGL, "Calling glViewport(%d, %d, %d, %d)",
COGL_NOTE (OPENGL, "Calling glViewport(%f, %f, %f, %f)",
draw_buffer->viewport_x,
gl_viewport_y,
draw_buffer->viewport_width,