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2018-06-28T21:04:27Z

1版をインポートしました

wiki>Jwilkins: Created page with "= The Pixels Aspect = Header File: `GPU_pixels.h` This aspect is meant to replace `Bitmap` and `DrawPixels`. However, it is different enough from ''OpenGL'..."

2013-09-23T23:42:20Z

Created page with "= The Pixels Aspect = Header File: <tt>GPU_pixels.h</tt> This aspect is meant to replace <tt>Bitmap</tt> and <tt>DrawPixels</tt>. However, it is different enough from ''OpenGL'..."

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= The Pixels Aspect =

Header File: <tt>GPU_pixels.h</tt>

This aspect is meant to replace <tt>Bitmap</tt> and <tt>DrawPixels</tt>.
However, it is different enough from ''OpenGL'' that all of the module's symbols have been prefixed with <tt>GPU_</tt>.

== Switching ==

<source lang="c">
void GPU_pixels_begin(void);
void GPU_pixels_end (void);
</source>

Instead of using the <tt>GPU_aspect_begin</tt> function to switch into the ''Pixel'' aspect,
this call has been wrapped with <tt>GPU_pixels_begin</tt>. Similarly with <tt>GPU_pixels_end</tt>.
These functions take care of ending the previous aspect (assumed to be ''Basic'')
and starting the ''Font'' aspect.

Unlike the other ''aspects'' these begin/end wrapper functions are somewhat
smart about default state and will automatically return ''OpenGL'' to its default
<tt>PixelStore</tt> state when <tt>GPU_pixels_end</tt> is called.

== Pixels ==

<source lang="c">
typedef struct GPUbitmap {
GLsizei width, height;
GLsizei xorig, yorig;
const GLubyte* bitmap;
} GPUbitmap;

typedef struct GPUpixels {
GLsizei width, height;
GLenum format;
GLenum type;
const GLvoid* pixels;
} GPUpixels;
</source>

<source lang="c">
void GPU_bitmap(GPUbitmap* bitmap);
void GPU_pixels(GPUpixels* pixels);
</source>

== Position ==

<source lang="c">
void GPU_pixels_pos_2f(GLfloat x, GLfloat y);
void GPU_pixels_pos_3f(GLfloat x, GLfloat y, GLfloat z);
</source>

== Format ==

<source lang="c">
void GPU_pixels_format(GLenum pname, GLint param);
</source>

<source lang="c">
GL_UNPACK_ROW_LENGTH
GL_UNPACK_SWAP_BYTES
GL_UNPACK_ALIGNMENT
</source>

The parameters passed to <tt>GPU_pixels_format</tt> control how data is read by <tt>GPU_pixels</tt> and <tt>GPU_pixels_cache</tt>.

== Caching ==

Normally <tt>DrawPixels</tt> does not cache pixel data on the graphics card, leading to inefficiencies.

<source lang="c">
void GPU_bitmap_cache (GPUbitmap* bitmap);
void GPU_pixels_cache (GPUpixels* pixels);

void GPU_bitmap_uncache(GPUbitmap* bitmap);
void GPU_pixels_uncache(GPUpixels* pixels);
</source>

== Zoom ==

<source lang="c">
void GPU_pixels_zoom(GLfloat xfactor, GLfloat yfactor);
void GPU_get_pixels_zoom(GLfloat* xfactor_out, GLfloat *yfactor_out);
</source>

The zoom factor passed into <tt>GPU_pixels_zoom</tt> has an effect similar to <tt>PixelZoom</tt>.

== Other Parameters ==

<source lang="c">
void GPU_pixels_uniform_1f(GLenum pname, GLfloat param);
</source>

<source lang="c">
GL_RED_SCALE
GL_RED_BIAS
GL_GREEN_SCALE
GL_GREEN_BIAS
GL_BLUE_SCALE
GL_BLUE_BIAS
GL_ALPHA_SCALE
GL_ALPHA_BIAS
</source>

The parameters passed to <tt>GPU_pixels_uniform_1f</tt> modify the color of the pixels drawn to the screen.

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利用者:Jwilkins/VFX/Aspects/Pixels - 版の履歴

Yamyam: 1版 をインポートしました

wiki>Jwilkins: Created page with "= The Pixels Aspect = Header File: GPU_pixels.h This aspect is meant to replace Bitmap and DrawPixels. However, it is different enough from ''OpenGL'..."

Yamyam: 1版をインポートしました

wiki>Jwilkins: Created page with "= The Pixels Aspect = Header File: `GPU_pixels.h` This aspect is meant to replace `Bitmap` and `DrawPixels`. However, it is different enough from ''OpenGL'..."