60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/**
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* Copyright (c) 2021 Dominic Masters
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*
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* This software is released under the MIT License.
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* https://opensource.org/licenses/MIT
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*/
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#include "image.h"
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void imageInit(image_t *image) {
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image->quad.verticeCount = -1;
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image->width = 1;
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image->height = 1;
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imageSetTexture(image, NULL);
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}
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void imageSetTexture(image_t *image, texture_t *texture) {
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imageSetTextureAndCrop(image, texture,
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0, 0,
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texture == NULL ? 0 : (float)texture->width,
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texture == NULL ? 0 : (float)texture->height
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);
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}
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void imageSetTextureAndCrop(image_t *image, texture_t *texture,
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float x, float y, float width, float height
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) {
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float u0, u1, v0, v1;
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if(image->quad.verticeCount != -1) {
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primitiveDispose(&image->quad);
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image->quad.verticeCount = -1;
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}
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if(texture == NULL) return;
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u0 = x / texture->width;
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u1 = u0 + (width / texture->width);
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v0 = y / texture->height;
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v1 = v0 + (height / texture->height);
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image->texture = texture;
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quadInit(&image->quad, 0,
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0,0,u0,v0,
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1,1,u1,v1
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);
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}
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void imageRender(image_t *image, shader_t *shader, float x, float y) {
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if(image->texture == NULL) return;
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shaderUsePositionAndScale(shader,
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x,y,0,
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0,0,0,
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image->width, image->height, 1
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);
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shaderUseTexture(shader, image->texture);
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primitiveDraw(&image->quad, 0, -1);
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}
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void imageDispose(image_t *image) {
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if(image->quad.verticeCount != -1) primitiveDispose(&image->quad);
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} |