Beatmup::GL::RenderingPrograms::Backend Class Reference

Public Member Functions
	Backend ()
	~Backend ()
void	bindMaskLookup (PixelFormat format)

Private Attributes
GLuint	hMaskLookups [3]
	texture containing mask values for 1, 2 and 4 bpp More...
bool	maskLookupsSet

Detailed Description

Definition at line 193 of file rendering_programs.cpp.

Constructor & Destructor Documentation

Backend()

Beatmup::GL::RenderingPrograms::Backend::Backend ( )

inline

Definition at line 199 of file rendering_programs.cpp.

: maskLookupsSet(false) {}

~Backend()

Beatmup::GL::RenderingPrograms::Backend::~Backend ( )

inline

Definition at line 200 of file rendering_programs.cpp.

{}

Member Function Documentation

bindMaskLookup()

void Beatmup::GL::RenderingPrograms::Backend::bindMaskLookup ( PixelFormat  format )

inline

Definition at line 203 of file rendering_programs.cpp.

                                            {
        glActiveTexture(GL_TEXTURE0 + TextureUnits::MASK_LOOKUP);
 
        if (!maskLookupsSet) {
            // masked blending lookup textures initialization
            unsigned char mask1[8][256], mask2[4][256], mask4[2][256];
            for (int v = 0; v < 256; ++v) {
                for (int o = 0; o < 8; ++o)
                    mask1[o][v] = ((v >> o) % 2) * 255;
                for (int o = 0; o < 4; ++o)
                    mask2[o][v] = (int)((v >> (2 * o)) % 4) * 255 / 3;
                for (int o = 0; o < 2; ++o)
                    mask4[o][v] = (int)((v >> (4 * o)) % 16) * 255 / 15;
            }
            glGenTextures(3, hMaskLookups);
            glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
            glBindTexture(GL_TEXTURE_2D, hMaskLookups[0]);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 256, 8, 0, GL_ALPHA, GL_UNSIGNED_BYTE, mask1);
            glBindTexture(GL_TEXTURE_2D, hMaskLookups[1]);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 256, 4, 0, GL_ALPHA, GL_UNSIGNED_BYTE, mask2);
            glBindTexture(GL_TEXTURE_2D, hMaskLookups[2]);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 256, 2, 0, GL_ALPHA, GL_UNSIGNED_BYTE, mask4);
            maskLookupsSet = true;
        }
 
        switch (format) {
        case BinaryMask:
            glBindTexture(GL_TEXTURE_2D, hMaskLookups[0]);
            break;
        case QuaternaryMask:
            glBindTexture(GL_TEXTURE_2D, hMaskLookups[1]);
            break;
        case HexMask:
            glBindTexture(GL_TEXTURE_2D, hMaskLookups[2]);
            break;
        default:
            throw GLException("Mask bitmap pixel format is not supported");
        }
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    }

Member Data Documentation

hMaskLookups

GLuint Beatmup::GL::RenderingPrograms::Backend::hMaskLookups[3]

private

texture containing mask values for 1, 2 and 4 bpp

Definition at line 195 of file rendering_programs.cpp.

maskLookupsSet

bool Beatmup::GL::RenderingPrograms::Backend::maskLookupsSet

private

Definition at line 196 of file rendering_programs.cpp.

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The documentation for this class was generated from the following file:

• core/gpu/rendering_programs.cpp