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view: translate/rotate view with gamepad

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This commit is contained in:
Zack Buhman 2026-04-30 19:22:28 -05:00
parent b79473a881
commit 9137cba3b4
5 changed files with 173 additions and 14 deletions
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1
Makefile
View File

@ -38,6 +38,7 @@ endif
OBJS = \
src/main.o \
src/view.o \
src/volk/volk.o \
src/file.o \
src/pack.o \

45
include/view.h Normal file
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@ -0,0 +1,45 @@
#pragma once
#include "directxmath/directxmath.h"
struct view {
// positions
XMVECTOR eye;
XMVECTOR at;
// vectors
XMVECTOR up;
XMVECTOR forward;
XMVECTOR normal; // cross(forward, up)
XMVECTOR direction; // rotationaxis(forward, pitch)
// angles
float pitch;
void applyTransform(float delta_forward, float delta_strafe, float delta_elevation,
float delta_yaw, float delta_pitch);
inline XMMATRIX getView()
{
return XMMatrixLookAtLH(eye, at, up);
}
inline float clampPitch(float delta_pitch)
{
float newPitch = pitch + delta_pitch;
if (newPitch > 1.57f) newPitch = 1.57f;
if (newPitch < -1.57f) newPitch = -1.57f;
return newPitch;
}
inline XMVECTOR getNormal()
{
return XMVector3Normalize(XMVector3Cross(forward, up));
}
inline XMVECTOR getDirection()
{
XMMATRIX mrn = XMMatrixRotationAxis(normal, pitch);
return XMVector3Transform(forward, mrn);
}
};

2
shader/minecraft.hlsl
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@ -44,7 +44,7 @@ VSOutput VSMain(VSInput input)
{
VSOutput output = (VSOutput)0;
float4 Position = float4(input.Position.xyz + input.BlockPosition, 1.0);
output.Position = mul(Scene.Projection, mul(Scene.View, Position));
output.Position = mul(Scene.Projection, mul(Scene.View, Position.xzyw)) * float4(-1, -1, 1, 1);
float2 textureOffset = float2(input.TextureID % 8, input.TextureID / 8) * 16;
output.Texture = float4(yf(input.Texture.xy, 16), textureOffset);

121
src/main.cpp
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@ -14,6 +14,7 @@
#include "vulkan_helper.h"
#include "shader_data.h"
#include "minmax.h"
#include "view.h"
#include "collada/scene.h"
#include "collada/scene/vulkan.h"
@ -285,9 +286,72 @@ inline static double getTime(int64_t start_time)
return (double)(time / 1000) * 0.000001;
}
static int const max_gamepads = 16;
static SDL_Gamepad * gamepads[max_gamepads];
static int gamepad_count = 0;
void add_gamepad(SDL_JoystickID instance_id)
{
SDL_Gamepad * gamepad = SDL_OpenGamepad(instance_id);
char const * name = SDL_GetGamepadName(gamepad);
if (gamepad_count >= max_gamepads) {
printf("too many gamepads; ignoring gamepad %d %s\n", instance_id, name);
SDL_CloseGamepad(gamepad);
} else {
printf("add gamepad %d %s\n", instance_id, name);
gamepads[gamepad_count] = gamepad;
gamepad_count += 1;
}
}
void remove_gamepad(SDL_JoystickID instance_id)
{
for (int i = 0; i < gamepad_count; i++) {
if (SDL_GetGamepadID(gamepads[i]) == instance_id) {
int tail = (gamepad_count - i) - 1;
SDL_CloseGamepad(gamepads[i]);
memcpy(&gamepads[i], &gamepads[i+1], tail * (sizeof (gamepads[0])));
gamepad_count -= 1;
return;
}
}
assert(!"remove_gamepad");
}
void gamepad_update(view & viewState)
{
for (int i = 0; i < gamepad_count; i++) {
SDL_Gamepad * gamepad = gamepads[i];
int16_t i_leftx = SDL_GetGamepadAxis(gamepad, SDL_GAMEPAD_AXIS_LEFTX);
int16_t i_lefty = SDL_GetGamepadAxis(gamepad, SDL_GAMEPAD_AXIS_LEFTY);
int16_t i_rightx = SDL_GetGamepadAxis(gamepad, SDL_GAMEPAD_AXIS_RIGHTX);
int16_t i_righty = SDL_GetGamepadAxis(gamepad, SDL_GAMEPAD_AXIS_RIGHTY);
int16_t i_left_trigger = SDL_GetGamepadAxis(gamepad, SDL_GAMEPAD_AXIS_LEFT_TRIGGER);
int16_t i_right_trigger = SDL_GetGamepadAxis(gamepad, SDL_GAMEPAD_AXIS_RIGHT_TRIGGER);
constexpr float scale = 1.0f / 32767.0f;
float leftx = (float)i_leftx * scale;
float lefty = (float)i_lefty * scale;
float rightx = (float)i_rightx * scale;
float righty = (float)i_righty * scale;
float left_trigger = (float)i_left_trigger * scale;
float right_trigger = (float)i_right_trigger * scale;
constexpr float translate_rate = 0.5;
float delta_forward = -lefty * translate_rate;
float delta_strafe = leftx * translate_rate;
float delta_elevation = (left_trigger - right_trigger) * translate_rate;
float delta_yaw = rightx * -0.035;
float delta_pitch = righty * -0.035;
viewState.applyTransform(delta_forward, delta_strafe, delta_elevation,
delta_yaw, delta_pitch);
}
}
int main()
{
SDL_CHECK(SDL_Init(SDL_INIT_VIDEO));
SDL_CHECK(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMEPAD));
SDL_CHECK(SDL_Vulkan_LoadLibrary(NULL));
volkInitialize();
@ -566,8 +630,8 @@ int main()
VK_CHECK(vkCreateSampler(device, &samplerCreateInfo1, nullptr, &textureSamplers[1]));
VkSamplerCreateInfo samplerCreateInfo2{
.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO,
.magFilter = VK_FILTER_LINEAR,
.minFilter = VK_FILTER_LINEAR,
.magFilter = VK_FILTER_NEAREST,
.minFilter = VK_FILTER_NEAREST,
.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR,
.addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
.addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
@ -610,10 +674,35 @@ int main()
physicalDeviceMemoryProperties,
surfaceFormat.format,
depthFormat,
textureSamplers[0],
textureSamplers[2],
shadowDepthImageViewDepth);
minecraft_state.init();
//////////////////////////////////////////////////////////////////////
// initialize view
//////////////////////////////////////////////////////////////////////
int cameraIndex = collada_state.find_node_index_by_name("Camera001");
int cameraTargetIndex = collada_state.find_node_index_by_name("EidelwindRigPelvis");
int lightIndex = collada_state.find_node_index_by_name("Camera001");
int lightTargetIndex = collada_state.find_node_index_by_name("EidelwindRigPelvis");
//int lightMaterialIndex = collada_state.find_material_index_by_name("LightMaterial");
int lightMaterialIndex = -1;
// view
XMVECTOR eye = XMVector3Transform(XMVectorZero(), collada_state.node_state.node_instances[cameraIndex].world);
XMVECTOR at = XMVector3Transform(XMVectorZero(), collada_state.node_state.node_instances[cameraTargetIndex].world);
XMVECTOR up = XMVectorSet(0, 0, 1, 0);
view viewState;
viewState.eye = eye;
//viewState.at = at;
viewState.up = up;
viewState.forward = XMVectorSetZ(XMVector3Normalize(at - eye), 0);
viewState.pitch = 0;
viewState.applyTransform(0, 0, 0, 0, 0);
//////////////////////////////////////////////////////////////////////
// loop
//////////////////////////////////////////////////////////////////////
@ -626,13 +715,6 @@ int main()
int64_t start_time;
SDL_GetCurrentTime(&start_time);
int cameraIndex = collada_state.find_node_index_by_name("Camera001");
int cameraTargetIndex = collada_state.find_node_index_by_name("EidelwindRigPelvis");
int lightIndex = collada_state.find_node_index_by_name("Camera001");
int lightTargetIndex = collada_state.find_node_index_by_name("EidelwindRigPelvis");
//int lightMaterialIndex = collada_state.find_material_index_by_name("LightMaterial");
int lightMaterialIndex = -1;
collada_state.update(0);
while (quit == false) {
@ -671,8 +753,20 @@ int main()
if (event.type == SDL_EVENT_WINDOW_RESIZED) {
SDL_CHECK(SDL_GetWindowSize(window, &windowSize.x, &windowSize.y));
}
if (event.type == SDL_EVENT_GAMEPAD_ADDED) {
add_gamepad(event.gdevice.which);
}
if (event.type == SDL_EVENT_GAMEPAD_REMOVED) {
remove_gamepad(event.gdevice.which);
}
}
//////////////////////////////////////////////////////////////////////
// gamepad update
//////////////////////////////////////////////////////////////////////
gamepad_update(viewState);
//////////////////////////////////////////////////////////////////////
// collada update
//////////////////////////////////////////////////////////////////////
@ -708,8 +802,9 @@ int main()
collada_state.vulkan.change_frame(commandBuffer, frameIndex);
XMMATRIX projection = currentProjection();
XMMATRIX view = currentView(collada_state.node_state.node_instances[cameraIndex],
collada_state.node_state.node_instances[cameraTargetIndex]);
//XMMATRIX view = currentView(collada_state.node_state.node_instances[cameraIndex],
//collada_state.node_state.node_instances[cameraTargetIndex]);
XMMATRIX view = viewState.getView();
XMMATRIX shadowProjection = XMMatrixOrthographicLH(150, 150, -1000, 1000);
XMMATRIX shadowView = currentView(collada_state.node_state.node_instances[lightIndex],
collada_state.node_state.node_instances[lightTargetIndex]);

18
src/view.cpp Normal file
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@ -0,0 +1,18 @@
#include "directxmath/directxmath.h"
#include "view.h"
constexpr float at_distance = 10.0;
void view::applyTransform(float delta_forward, float delta_strafe, float delta_elevation,
float delta_yaw, float delta_pitch)
{
pitch = clampPitch(delta_pitch);
forward = XMVector3Transform(forward, XMMatrixRotationZ(delta_yaw));
normal = getNormal(); // on forward change
direction = getDirection(); // on forward/normal/pitch change
eye += forward * delta_forward + normal * delta_strafe + up * delta_elevation;
at = eye + direction * at_distance;
}