diff options
Diffstat (limited to 'engines/sword25/util/glsprites/internal/sprite_pow2.c')
| -rwxr-xr-x | engines/sword25/util/glsprites/internal/sprite_pow2.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/engines/sword25/util/glsprites/internal/sprite_pow2.c b/engines/sword25/util/glsprites/internal/sprite_pow2.c new file mode 100755 index 0000000000..8b4ebe18fe --- /dev/null +++ b/engines/sword25/util/glsprites/internal/sprite_pow2.c @@ -0,0 +1,170 @@ +/******************************************************************************/ +/* This file is part of Broken Sword 2.5 */ +/* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdörfer */ +/* */ +/* Broken Sword 2.5 is free software; you can redistribute it and/or modify */ +/* it under the terms of the GNU General Public License as published by */ +/* the Free Software Foundation; either version 2 of the License, or */ +/* (at your option) any later version. */ +/* */ +/* Broken Sword 2.5 is distributed in the hope that it will be useful, */ +/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ +/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ +/* GNU General Public License for more details. */ +/* */ +/* You should have received a copy of the GNU General Public License */ +/* along with Broken Sword 2.5; if not, write to the Free Software */ +/* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ +/******************************************************************************/ + +/* -------------------------------------------------------------------------- + INCLUDES + -------------------------------------------------------------------------- */ + +#include <malloc.h> + +#include "glinclude.h" +#include "util.h" +#include "sprite.h" +#include "sprite_pow2.h" + +/* -------------------------------------------------------------------------- */ + +static GLS_Result Delete(GLS_Sprite *); +static GLS_Result Blit(GLS_Sprite *, const GLS_Rect *); +static GLS_Result SetData(GLS_Sprite *, GLS_UInt32, GLS_UInt32, const void *, GLS_UInt32); +static GLS_spriteFunctionTable pow2FunctionTable = { ST_POW2, Delete, Blit, SetData }; + +/* -------------------------------------------------------------------------- */ + +typedef struct +{ + /* These first three members have to be present at the start of each sprite type. */ + GLS_spriteFunctionTable * functionTable; + GLS_UInt32 width; + GLS_UInt32 height; + + GLS_UInt32 widthPow2; + GLS_UInt32 heightPow2; + GLint textureID; +} spritePow2; + + +/* -------------------------------------------------------------------------- */ + +GLS_Result GLS_NewSpritePow2(GLS_UInt32 width, GLS_UInt32 height, GLS_Bool useAlphachannel, void * data, GLS_Sprite ** pSprite) +{ + GLS_UInt32 widthPow2 = GLS_NextPowerOf2(width); + GLS_UInt32 heightPow2 = GLS_NextPowerOf2(height); + + /* Allocate memory for sprite object */ + spritePow2 * sprite = (spritePow2 *) malloc(sizeof(spritePow2)); + if (!sprite) return GLS_OUT_OF_MEMORY; + + /* Initialize sprite object */ + sprite->functionTable = &pow2FunctionTable; + sprite->textureID = 0; + sprite->width = width; + sprite->height = height; + sprite->widthPow2 = widthPow2; + sprite->heightPow2 = heightPow2; + + /* Create OpenGL texture */ + glGenTextures(1, &(sprite->textureID)); + glBindTexture(GL_TEXTURE_2D, sprite->textureID); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + + glTexImage2D(GL_TEXTURE_2D, 0, useAlphachannel ? GL_RGBA8 : GL_RGB8, widthPow2, heightPow2, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0); + + /* Fill the texture with the supplied pixel data. + We don't use glTexImage2D for this, because the created sprite might not have power of 2 dimensions and therefore the + supplied pixeldata wouldn't cover the whole texture. */ + if (data) glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data); + + *pSprite = (GLS_Sprite) sprite; + + if (glGetError()) + { + Delete(*pSprite); + return GLS_TEXTURE_CREATION_FAILED; + } + + return GLS_OK; +} + + +/* -------------------------------------------------------------------------- */ + +static GLS_Result Delete(GLS_Sprite * sprite) +{ + spritePow2 * s = (spritePow2 *) sprite; + + if (s->textureID) glDeleteTextures(1, &s->textureID); + free(s); + + return GLS_OK; +} + + +/* -------------------------------------------------------------------------- */ + +static GLS_Result Blit(GLS_Sprite * sprite, + const GLS_Rect * subImage) +{ + GLfloat width, height; + GLfloat texX1, texY1, texX2, texY2; + + spritePow2 * s = (spritePow2 *) sprite; + + width = (float) (subImage->x2 - subImage->x1); + height = (float) (subImage->y2 - subImage->y1); + + texX1 = (GLfloat) subImage->x1 / (GLfloat) s->widthPow2; + texY1 = (GLfloat) subImage->y1 / (GLfloat) s->heightPow2; + texX2 = (GLfloat) subImage->x2 / (GLfloat) s->widthPow2; + texY2 = (GLfloat) subImage->y2 / (GLfloat) s->heightPow2; + + glBindTexture(GL_TEXTURE_2D, s->textureID); + + glEnable(GL_TEXTURE_2D); + + glBegin(GL_QUADS); + glTexCoord2f(texX1, texY1); + glVertex2f(0.0f, 0.0f); + + glTexCoord2f(texX2, texY1); + glVertex2f(width, 0.0f); + + glTexCoord2f(texX2, texY2); + glVertex2f(width, height); + + glTexCoord2f(texX1, texY2); + glVertex2f(0.0f, height); + glEnd(); + + glDisable(GL_TEXTURE_2D); + + return glGetError() ? GLS_OPENGL_ERROR : GLS_OK; +} + + +/* -------------------------------------------------------------------------- */ + +static GLS_Result SetData(GLS_Sprite * sprite, GLS_UInt32 width, GLS_UInt32 height, const void * data, GLS_UInt32 stride) +{ + spritePow2 * s = (spritePow2 *) sprite; + + glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT); + + glPixelStorei(GL_UNPACK_ROW_LENGTH, width + stride); + + glBindTexture(GL_TEXTURE_2D, s->textureID); + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data); + + glPopClientAttrib(); + + return glGetError() ? GLS_OPENGL_ERROR : GLS_OK; +} |