Attachment 138865 Details for Bug 106074 – Sample program to demonstrate the issue

Sample program to demonstrate the issue

viewport.c (text/x-csrc), 1.42 KB, created by Philip Rebohle on 2018-04-16 11:35:40 UTC

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Creator: Philip Rebohle

Created: 2018-04-16 11:35:40 UTC

Size: 1.42 KB

patch

obsolete

>// compile with:
>// gcc viewport.c -lm
>
>#include <vulkan/vulkan.h>
>
>#include <math.h>
>#include <stdio.h>
>#include <stdlib.h>
>
>// taken from si_cmd_buffer.c
>void get_viewport_xform(const VkViewport *viewport,
>                   float scale[3], float translate[3])
>{
>        float x = viewport->x;
>        float y = viewport->y;
>        float half_width = 0.5f * viewport->width;
>        float half_height = 0.5f * viewport->height;
>        double n = viewport->minDepth;
>        double f = viewport->maxDepth;
>
>        scale[0] = half_width;
>        translate[0] = half_width + x;
>        scale[1] = half_height;
>        translate[1] = half_height + y;
>
>        scale[2] = (f - n);
>        translate[2] = n;
>}
>
>VkRect2D si_scissor_from_viewport(const VkViewport *viewport)
>{
>        float scale[3], translate[3];
>        VkRect2D rect;
>
>        get_viewport_xform(viewport, scale, translate);
>
>        rect.offset.x = translate[0] - abs(scale[0]);
>        rect.offset.y = translate[1] - abs(scale[1]);
>        rect.extent.width = ceilf(translate[0] + abs(scale[0])) - rect.offset.x;
>        rect.extent.height = ceilf(translate[1] + abs(scale[1])) - rect.offset.y;
>
>        return rect;
>}
>
>int main(int argc, char** argv) {
>	VkViewport vp = { 0.5f, 1.5f, 1.0f, -1.0f, 0.0f, 1.0f };
>	VkRect2D rect = si_scissor_from_viewport(&vp);
>	printf("ofs: %d,%d size: %dx%d\n",
>		rect.offset.x,
>		rect.offset.y,
>		rect.extent.width,
>		rect.extent.height);
>	return 0;
>}

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Attachments on bug 106074: 138865 | 138867

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